11305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood/*- 21305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * Copyright (c) 2002 Networks Associates Technology, Inc. 31305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * All rights reserved. 41305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * 51305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * This software was developed for the FreeBSD Project by ThinkSec AS and 61305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * NAI Labs, the Security Research Division of Network Associates, Inc. 71305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the 81305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * DARPA CHATS research program. 91305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * 101305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * Redistribution and use in source and binary forms, with or without 111305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * modification, are permitted provided that the following conditions 121305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * are met: 131305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * 1. Redistributions of source code must retain the above copyright 141305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * notice, this list of conditions and the following disclaimer. 151305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * 2. Redistributions in binary form must reproduce the above copyright 161305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * notice, this list of conditions and the following disclaimer in the 171305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * documentation and/or other materials provided with the distribution. 181305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * 191305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 201305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 211305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 221305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 231305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 241305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 251305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 261305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 271305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 281305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 291305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * SUCH DAMAGE. 301305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood */ 311305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood/* 321305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * Copyright (c) 2003,2004 Damien Miller <djm@mindrot.org> 331305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * Copyright (c) 2003,2004 Darren Tucker <dtucker@zip.com.au> 341305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * 351305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * Permission to use, copy, modify, and distribute this software for any 361305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * purpose with or without fee is hereby granted, provided that the above 371305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * copyright notice and this permission notice appear in all copies. 381305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * 391305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 401305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 411305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 421305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 431305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 441305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 451305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 461305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood */ 471305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 481305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood/* Based on $FreeBSD: src/crypto/openssh/auth2-pam-freebsd.c,v 1.11 2003/03/31 13:48:18 des Exp $ */ 491305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#include "includes.h" 501305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 511305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#include <sys/types.h> 521305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#include <sys/stat.h> 531305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#include <sys/wait.h> 541305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 551305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#include <errno.h> 561305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#include <signal.h> 571305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#include <stdarg.h> 581305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#include <string.h> 591305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#include <unistd.h> 601305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 611305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#ifdef USE_PAM 621305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#if defined(HAVE_SECURITY_PAM_APPL_H) 631305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#include <security/pam_appl.h> 641305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#elif defined (HAVE_PAM_PAM_APPL_H) 651305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#include <pam/pam_appl.h> 661305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#endif 671305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 681305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood/* OpenGroup RFC86.0 and XSSO specify no "const" on arguments */ 691305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#ifdef PAM_SUN_CODEBASE 701305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood# define sshpam_const /* Solaris, HP-UX, AIX */ 711305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#else 721305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood# define sshpam_const const /* LinuxPAM, OpenPAM */ 731305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#endif 741305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 751305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood/* Ambiguity in spec: is it an array of pointers or a pointer to an array? */ 761305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#ifdef PAM_SUN_CODEBASE 771305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood# define PAM_MSG_MEMBER(msg, n, member) ((*(msg))[(n)].member) 781305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#else 791305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood# define PAM_MSG_MEMBER(msg, n, member) ((msg)[(n)]->member) 801305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#endif 811305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 821305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#include "xmalloc.h" 831305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#include "buffer.h" 841305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#include "key.h" 851305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#include "hostfile.h" 861305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#include "auth.h" 871305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#include "auth-pam.h" 881305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#include "canohost.h" 891305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#include "log.h" 901305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#include "msg.h" 911305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#include "packet.h" 921305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#include "misc.h" 931305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#include "servconf.h" 941305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#include "ssh2.h" 951305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#include "auth-options.h" 961305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#ifdef GSSAPI 971305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#include "ssh-gss.h" 981305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#endif 991305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#include "monitor_wrap.h" 1001305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 1011305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodextern ServerOptions options; 1021305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodextern Buffer loginmsg; 1031305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodextern int compat20; 1041305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodextern u_int utmp_len; 1051305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 1061305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood/* so we don't silently change behaviour */ 1071305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#ifdef USE_POSIX_THREADS 1081305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood# error "USE_POSIX_THREADS replaced by UNSUPPORTED_POSIX_THREADS_HACK" 1091305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#endif 1101305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 1111305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood/* 1121305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * Formerly known as USE_POSIX_THREADS, using this is completely unsupported 1131305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * and generally a bad idea. Use at own risk and do not expect support if 1141305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * this breaks. 1151305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood */ 1161305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#ifdef UNSUPPORTED_POSIX_THREADS_HACK 1171305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#include <pthread.h> 1181305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood/* 1191305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * Avoid namespace clash when *not* using pthreads for systems *with* 1201305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * pthreads, which unconditionally define pthread_t via sys/types.h 1211305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * (e.g. Linux) 1221305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood */ 1231305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodtypedef pthread_t sp_pthread_t; 1241305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#else 1251305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodtypedef pid_t sp_pthread_t; 1261305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#endif 1271305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 1281305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodstruct pam_ctxt { 1291305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sp_pthread_t pam_thread; 1301305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood int pam_psock; 1311305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood int pam_csock; 1321305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood int pam_done; 1331305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood}; 1341305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 1351305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodstatic void sshpam_free_ctx(void *); 1361305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodstatic struct pam_ctxt *cleanup_ctxt; 1371305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 1381305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#ifndef UNSUPPORTED_POSIX_THREADS_HACK 1391305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood/* 1401305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * Simulate threads with processes. 1411305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood */ 1421305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 1431305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodstatic int sshpam_thread_status = -1; 1441305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodstatic mysig_t sshpam_oldsig; 1451305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 1461305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodstatic void 1471305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodsshpam_sigchld_handler(int sig) 1481305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood{ 1491305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood signal(SIGCHLD, SIG_DFL); 1501305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (cleanup_ctxt == NULL) 1511305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return; /* handler called after PAM cleanup, shouldn't happen */ 1521305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (waitpid(cleanup_ctxt->pam_thread, &sshpam_thread_status, WNOHANG) 1531305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood <= 0) { 1541305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood /* PAM thread has not exitted, privsep slave must have */ 1551305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood kill(cleanup_ctxt->pam_thread, SIGTERM); 1561305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (waitpid(cleanup_ctxt->pam_thread, &sshpam_thread_status, 0) 1571305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood <= 0) 1581305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return; /* could not wait */ 1591305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 1601305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (WIFSIGNALED(sshpam_thread_status) && 1611305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood WTERMSIG(sshpam_thread_status) == SIGTERM) 1621305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return; /* terminated by pthread_cancel */ 1631305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (!WIFEXITED(sshpam_thread_status)) 1641305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sigdie("PAM: authentication thread exited unexpectedly"); 1651305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (WEXITSTATUS(sshpam_thread_status) != 0) 1661305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sigdie("PAM: authentication thread exited uncleanly"); 1671305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood} 1681305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 1691305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood/* ARGSUSED */ 1701305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodstatic void 1711305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodpthread_exit(void *value) 1721305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood{ 1731305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood _exit(0); 1741305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood} 1751305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 1761305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood/* ARGSUSED */ 1771305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodstatic int 1781305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodpthread_create(sp_pthread_t *thread, const void *attr, 1791305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood void *(*thread_start)(void *), void *arg) 1801305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood{ 1811305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood pid_t pid; 1821305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood struct pam_ctxt *ctx = arg; 1831305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 1841305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_thread_status = -1; 1851305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood switch ((pid = fork())) { 1861305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood case -1: 1871305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood error("fork(): %s", strerror(errno)); 1881305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (-1); 1891305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood case 0: 1901305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood close(ctx->pam_psock); 1911305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood ctx->pam_psock = -1; 1921305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood thread_start(arg); 1931305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood _exit(1); 1941305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood default: 1951305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood *thread = pid; 1961305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood close(ctx->pam_csock); 1971305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood ctx->pam_csock = -1; 1981305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_oldsig = signal(SIGCHLD, sshpam_sigchld_handler); 1991305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (0); 2001305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 2011305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood} 2021305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 2031305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodstatic int 2041305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodpthread_cancel(sp_pthread_t thread) 2051305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood{ 2061305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood signal(SIGCHLD, sshpam_oldsig); 2071305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (kill(thread, SIGTERM)); 2081305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood} 2091305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 2101305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood/* ARGSUSED */ 2111305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodstatic int 2121305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodpthread_join(sp_pthread_t thread, void **value) 2131305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood{ 2141305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood int status; 2151305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 2161305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (sshpam_thread_status != -1) 2171305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (sshpam_thread_status); 2181305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood signal(SIGCHLD, sshpam_oldsig); 2191305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood waitpid(thread, &status, 0); 2201305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (status); 2211305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood} 2221305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#endif 2231305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 2241305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 2251305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodstatic pam_handle_t *sshpam_handle = NULL; 2261305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodstatic int sshpam_err = 0; 2271305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodstatic int sshpam_authenticated = 0; 2281305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodstatic int sshpam_session_open = 0; 2291305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodstatic int sshpam_cred_established = 0; 2301305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodstatic int sshpam_account_status = -1; 2311305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodstatic char **sshpam_env = NULL; 2321305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodstatic Authctxt *sshpam_authctxt = NULL; 2331305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodstatic const char *sshpam_password = NULL; 2341305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodstatic char badpw[] = "\b\n\r\177INCORRECT"; 2351305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 2361305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood/* Some PAM implementations don't implement this */ 2371305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#ifndef HAVE_PAM_GETENVLIST 2381305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodstatic char ** 2391305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodpam_getenvlist(pam_handle_t *pamh) 2401305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood{ 2411305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood /* 2421305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * XXX - If necessary, we can still support envrionment passing 2431305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * for platforms without pam_getenvlist by searching for known 2441305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * env vars (e.g. KRB5CCNAME) from the PAM environment. 2451305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood */ 2461305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return NULL; 2471305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood} 2481305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#endif 2491305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 2501305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood/* 2511305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * Some platforms, notably Solaris, do not enforce password complexity 2521305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * rules during pam_chauthtok() if the real uid of the calling process 2531305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * is 0, on the assumption that it's being called by "passwd" run by root. 2541305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * This wraps pam_chauthtok and sets/restore the real uid so PAM will do 2551305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * the right thing. 2561305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood */ 2571305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#ifdef SSHPAM_CHAUTHTOK_NEEDS_RUID 2581305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodstatic int 2591305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodsshpam_chauthtok_ruid(pam_handle_t *pamh, int flags) 2601305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood{ 2611305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood int result; 2621305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 2631305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (sshpam_authctxt == NULL) 2641305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood fatal("PAM: sshpam_authctxt not initialized"); 2651305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (setreuid(sshpam_authctxt->pw->pw_uid, -1) == -1) 2661305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood fatal("%s: setreuid failed: %s", __func__, strerror(errno)); 2671305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood result = pam_chauthtok(pamh, flags); 2681305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (setreuid(0, -1) == -1) 2691305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood fatal("%s: setreuid failed: %s", __func__, strerror(errno)); 2701305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return result; 2711305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood} 2721305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood# define pam_chauthtok(a,b) (sshpam_chauthtok_ruid((a), (b))) 2731305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#endif 2741305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 2751305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodvoid 2761305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodsshpam_password_change_required(int reqd) 2771305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood{ 2781305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood debug3("%s %d", __func__, reqd); 2791305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (sshpam_authctxt == NULL) 2801305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood fatal("%s: PAM authctxt not initialized", __func__); 2811305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_authctxt->force_pwchange = reqd; 2821305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (reqd) { 2831305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood no_port_forwarding_flag |= 2; 2841305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood no_agent_forwarding_flag |= 2; 2851305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood no_x11_forwarding_flag |= 2; 2861305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } else { 2871305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood no_port_forwarding_flag &= ~2; 2881305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood no_agent_forwarding_flag &= ~2; 2891305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood no_x11_forwarding_flag &= ~2; 2901305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 2911305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood} 2921305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 2931305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood/* Import regular and PAM environment from subprocess */ 2941305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodstatic void 2951305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodimport_environments(Buffer *b) 2961305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood{ 2971305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood char *env; 2981305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood u_int i, num_env; 2991305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood int err; 3001305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 3011305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood debug3("PAM: %s entering", __func__); 3021305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 3031305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#ifndef UNSUPPORTED_POSIX_THREADS_HACK 3041305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood /* Import variables set by do_pam_account */ 3051305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_account_status = buffer_get_int(b); 3061305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_password_change_required(buffer_get_int(b)); 3071305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 3081305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood /* Import environment from subprocess */ 3091305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood num_env = buffer_get_int(b); 3101305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (num_env > 1024) 3111305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood fatal("%s: received %u environment variables, expected <= 1024", 3121305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood __func__, num_env); 3131305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_env = xcalloc(num_env + 1, sizeof(*sshpam_env)); 3141305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood debug3("PAM: num env strings %d", num_env); 3151305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood for(i = 0; i < num_env; i++) 3161305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_env[i] = buffer_get_string(b, NULL); 3171305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 3181305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_env[num_env] = NULL; 3191305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 3201305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood /* Import PAM environment from subprocess */ 3211305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood num_env = buffer_get_int(b); 3221305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood debug("PAM: num PAM env strings %d", num_env); 3231305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood for(i = 0; i < num_env; i++) { 3241305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood env = buffer_get_string(b, NULL); 3251305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 3261305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#ifdef HAVE_PAM_PUTENV 3271305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood /* Errors are not fatal here */ 3281305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if ((err = pam_putenv(sshpam_handle, env)) != PAM_SUCCESS) { 3291305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood error("PAM: pam_putenv: %s", 3301305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood pam_strerror(sshpam_handle, sshpam_err)); 3311305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 3321305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#endif 3331305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 3341305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#endif 3351305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood} 3361305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 3371305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood/* 3381305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * Conversation function for authentication thread. 3391305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood */ 3401305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodstatic int 3411305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodsshpam_thread_conv(int n, sshpam_const struct pam_message **msg, 3421305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood struct pam_response **resp, void *data) 3431305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood{ 3441305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood Buffer buffer; 3451305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood struct pam_ctxt *ctxt; 3461305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood struct pam_response *reply; 3471305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood int i; 3481305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 3491305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood debug3("PAM: %s entering, %d messages", __func__, n); 3501305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood *resp = NULL; 3511305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 3521305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (data == NULL) { 3531305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood error("PAM: conversation function passed a null context"); 3541305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (PAM_CONV_ERR); 3551305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 3561305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood ctxt = data; 3571305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (n <= 0 || n > PAM_MAX_NUM_MSG) 3581305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (PAM_CONV_ERR); 3591305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 3601305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if ((reply = calloc(n, sizeof(*reply))) == NULL) 3611305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (PAM_CONV_ERR); 3621305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 3631305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood buffer_init(&buffer); 3641305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood for (i = 0; i < n; ++i) { 3651305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood switch (PAM_MSG_MEMBER(msg, i, msg_style)) { 3661305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood case PAM_PROMPT_ECHO_OFF: 3671305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood buffer_put_cstring(&buffer, 3681305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood PAM_MSG_MEMBER(msg, i, msg)); 3691305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (ssh_msg_send(ctxt->pam_csock, 3701305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood PAM_MSG_MEMBER(msg, i, msg_style), &buffer) == -1) 3711305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood goto fail; 3721305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (ssh_msg_recv(ctxt->pam_csock, &buffer) == -1) 3731305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood goto fail; 3741305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (buffer_get_char(&buffer) != PAM_AUTHTOK) 3751305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood goto fail; 3761305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood reply[i].resp = buffer_get_string(&buffer, NULL); 3771305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood break; 3781305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood case PAM_PROMPT_ECHO_ON: 3791305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood buffer_put_cstring(&buffer, 3801305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood PAM_MSG_MEMBER(msg, i, msg)); 3811305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (ssh_msg_send(ctxt->pam_csock, 3821305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood PAM_MSG_MEMBER(msg, i, msg_style), &buffer) == -1) 3831305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood goto fail; 3841305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (ssh_msg_recv(ctxt->pam_csock, &buffer) == -1) 3851305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood goto fail; 3861305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (buffer_get_char(&buffer) != PAM_AUTHTOK) 3871305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood goto fail; 3881305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood reply[i].resp = buffer_get_string(&buffer, NULL); 3891305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood break; 3901305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood case PAM_ERROR_MSG: 3911305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood buffer_put_cstring(&buffer, 3921305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood PAM_MSG_MEMBER(msg, i, msg)); 3931305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (ssh_msg_send(ctxt->pam_csock, 3941305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood PAM_MSG_MEMBER(msg, i, msg_style), &buffer) == -1) 3951305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood goto fail; 3961305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood break; 3971305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood case PAM_TEXT_INFO: 3981305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood buffer_put_cstring(&buffer, 3991305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood PAM_MSG_MEMBER(msg, i, msg)); 4001305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (ssh_msg_send(ctxt->pam_csock, 4011305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood PAM_MSG_MEMBER(msg, i, msg_style), &buffer) == -1) 4021305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood goto fail; 4031305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood break; 4041305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood default: 4051305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood goto fail; 4061305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 4071305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood buffer_clear(&buffer); 4081305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 4091305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood buffer_free(&buffer); 4101305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood *resp = reply; 4111305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (PAM_SUCCESS); 4121305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 4131305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood fail: 4141305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood for(i = 0; i < n; i++) { 4151305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (reply[i].resp != NULL) 4161305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood xfree(reply[i].resp); 4171305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 4181305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood xfree(reply); 4191305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood buffer_free(&buffer); 4201305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (PAM_CONV_ERR); 4211305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood} 4221305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 4231305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood/* 4241305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * Authentication thread. 4251305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood */ 4261305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodstatic void * 4271305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodsshpam_thread(void *ctxtp) 4281305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood{ 4291305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood struct pam_ctxt *ctxt = ctxtp; 4301305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood Buffer buffer; 4311305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood struct pam_conv sshpam_conv; 4321305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood int flags = (options.permit_empty_passwd == 0 ? 4331305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood PAM_DISALLOW_NULL_AUTHTOK : 0); 4341305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#ifndef UNSUPPORTED_POSIX_THREADS_HACK 4351305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood extern char **environ; 4361305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood char **env_from_pam; 4371305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood u_int i; 4381305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood const char *pam_user; 4391305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood const char **ptr_pam_user = &pam_user; 4401305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood char *tz = getenv("TZ"); 4411305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 4421305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood pam_get_item(sshpam_handle, PAM_USER, 4431305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood (sshpam_const void **)ptr_pam_user); 4441305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 4451305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood environ[0] = NULL; 4461305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (tz != NULL) 4471305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (setenv("TZ", tz, 1) == -1) 4481305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood error("PAM: could not set TZ environment: %s", 4491305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood strerror(errno)); 4501305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 4511305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (sshpam_authctxt != NULL) { 4521305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood setproctitle("%s [pam]", 4531305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_authctxt->valid ? pam_user : "unknown"); 4541305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 4551305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#endif 4561305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 4571305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_conv.conv = sshpam_thread_conv; 4581305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_conv.appdata_ptr = ctxt; 4591305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 4601305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (sshpam_authctxt == NULL) 4611305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood fatal("%s: PAM authctxt not initialized", __func__); 4621305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 4631305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood buffer_init(&buffer); 4641305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_err = pam_set_item(sshpam_handle, PAM_CONV, 4651305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood (const void *)&sshpam_conv); 4661305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (sshpam_err != PAM_SUCCESS) 4671305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood goto auth_fail; 4681305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_err = pam_authenticate(sshpam_handle, flags); 4691305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (sshpam_err != PAM_SUCCESS) 4701305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood goto auth_fail; 4711305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 4721305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (compat20) { 4731305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (!do_pam_account()) { 4741305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_err = PAM_ACCT_EXPIRED; 4751305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood goto auth_fail; 4761305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 4771305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (sshpam_authctxt->force_pwchange) { 4781305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_err = pam_chauthtok(sshpam_handle, 4791305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood PAM_CHANGE_EXPIRED_AUTHTOK); 4801305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (sshpam_err != PAM_SUCCESS) 4811305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood goto auth_fail; 4821305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_password_change_required(0); 4831305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 4841305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 4851305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 4861305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood buffer_put_cstring(&buffer, "OK"); 4871305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 4881305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#ifndef UNSUPPORTED_POSIX_THREADS_HACK 4891305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood /* Export variables set by do_pam_account */ 4901305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood buffer_put_int(&buffer, sshpam_account_status); 4911305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood buffer_put_int(&buffer, sshpam_authctxt->force_pwchange); 4921305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 4931305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood /* Export any environment strings set in child */ 4941305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood for(i = 0; environ[i] != NULL; i++) 4951305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood ; /* Count */ 4961305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood buffer_put_int(&buffer, i); 4971305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood for(i = 0; environ[i] != NULL; i++) 4981305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood buffer_put_cstring(&buffer, environ[i]); 4991305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 5001305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood /* Export any environment strings set by PAM in child */ 5011305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood env_from_pam = pam_getenvlist(sshpam_handle); 5021305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood for(i = 0; env_from_pam != NULL && env_from_pam[i] != NULL; i++) 5031305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood ; /* Count */ 5041305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood buffer_put_int(&buffer, i); 5051305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood for(i = 0; env_from_pam != NULL && env_from_pam[i] != NULL; i++) 5061305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood buffer_put_cstring(&buffer, env_from_pam[i]); 5071305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#endif /* UNSUPPORTED_POSIX_THREADS_HACK */ 5081305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 5091305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood /* XXX - can't do much about an error here */ 5101305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood ssh_msg_send(ctxt->pam_csock, sshpam_err, &buffer); 5111305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood buffer_free(&buffer); 5121305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood pthread_exit(NULL); 5131305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 5141305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood auth_fail: 5151305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood buffer_put_cstring(&buffer, 5161305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood pam_strerror(sshpam_handle, sshpam_err)); 5171305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood /* XXX - can't do much about an error here */ 5181305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (sshpam_err == PAM_ACCT_EXPIRED) 5191305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood ssh_msg_send(ctxt->pam_csock, PAM_ACCT_EXPIRED, &buffer); 5201305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood else 5211305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood ssh_msg_send(ctxt->pam_csock, PAM_AUTH_ERR, &buffer); 5221305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood buffer_free(&buffer); 5231305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood pthread_exit(NULL); 5241305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 5251305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (NULL); /* Avoid warning for non-pthread case */ 5261305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood} 5271305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 5281305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodvoid 5291305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodsshpam_thread_cleanup(void) 5301305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood{ 5311305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood struct pam_ctxt *ctxt = cleanup_ctxt; 5321305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 5331305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood debug3("PAM: %s entering", __func__); 5341305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (ctxt != NULL && ctxt->pam_thread != 0) { 5351305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood pthread_cancel(ctxt->pam_thread); 5361305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood pthread_join(ctxt->pam_thread, NULL); 5371305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood close(ctxt->pam_psock); 5381305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood close(ctxt->pam_csock); 5391305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood memset(ctxt, 0, sizeof(*ctxt)); 5401305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood cleanup_ctxt = NULL; 5411305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 5421305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood} 5431305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 5441305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodstatic int 5451305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodsshpam_null_conv(int n, sshpam_const struct pam_message **msg, 5461305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood struct pam_response **resp, void *data) 5471305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood{ 5481305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood debug3("PAM: %s entering, %d messages", __func__, n); 5491305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (PAM_CONV_ERR); 5501305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood} 5511305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 5521305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodstatic struct pam_conv null_conv = { sshpam_null_conv, NULL }; 5531305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 5541305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodstatic int 5551305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodsshpam_store_conv(int n, sshpam_const struct pam_message **msg, 5561305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood struct pam_response **resp, void *data) 5571305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood{ 5581305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood struct pam_response *reply; 5591305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood int i; 5601305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood size_t len; 5611305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 5621305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood debug3("PAM: %s called with %d messages", __func__, n); 5631305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood *resp = NULL; 5641305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 5651305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (n <= 0 || n > PAM_MAX_NUM_MSG) 5661305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (PAM_CONV_ERR); 5671305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 5681305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if ((reply = calloc(n, sizeof(*reply))) == NULL) 5691305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (PAM_CONV_ERR); 5701305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 5711305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood for (i = 0; i < n; ++i) { 5721305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood switch (PAM_MSG_MEMBER(msg, i, msg_style)) { 5731305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood case PAM_ERROR_MSG: 5741305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood case PAM_TEXT_INFO: 5751305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood len = strlen(PAM_MSG_MEMBER(msg, i, msg)); 5761305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood buffer_append(&loginmsg, PAM_MSG_MEMBER(msg, i, msg), len); 5771305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood buffer_append(&loginmsg, "\n", 1 ); 5781305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood reply[i].resp_retcode = PAM_SUCCESS; 5791305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood break; 5801305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood default: 5811305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood goto fail; 5821305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 5831305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 5841305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood *resp = reply; 5851305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (PAM_SUCCESS); 5861305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 5871305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood fail: 5881305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood for(i = 0; i < n; i++) { 5891305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (reply[i].resp != NULL) 5901305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood xfree(reply[i].resp); 5911305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 5921305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood xfree(reply); 5931305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (PAM_CONV_ERR); 5941305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood} 5951305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 5961305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodstatic struct pam_conv store_conv = { sshpam_store_conv, NULL }; 5971305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 5981305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodvoid 5991305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodsshpam_cleanup(void) 6001305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood{ 6011305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (sshpam_handle == NULL || (use_privsep && !mm_is_monitor())) 6021305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return; 6031305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood debug("PAM: cleanup"); 6041305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood pam_set_item(sshpam_handle, PAM_CONV, (const void *)&null_conv); 6051305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (sshpam_session_open) { 6061305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood debug("PAM: closing session"); 6071305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood pam_close_session(sshpam_handle, PAM_SILENT); 6081305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_session_open = 0; 6091305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 6101305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (sshpam_cred_established) { 6111305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood debug("PAM: deleting credentials"); 6121305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood pam_setcred(sshpam_handle, PAM_DELETE_CRED); 6131305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_cred_established = 0; 6141305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 6151305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_authenticated = 0; 6161305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood pam_end(sshpam_handle, sshpam_err); 6171305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_handle = NULL; 6181305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood} 6191305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 6201305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodstatic int 6211305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodsshpam_init(Authctxt *authctxt) 6221305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood{ 6231305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood extern char *__progname; 6241305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood const char *pam_rhost, *pam_user, *user = authctxt->user; 6251305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood const char **ptr_pam_user = &pam_user; 6261305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 6271305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (sshpam_handle != NULL) { 6281305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood /* We already have a PAM context; check if the user matches */ 6291305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_err = pam_get_item(sshpam_handle, 6301305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood PAM_USER, (sshpam_const void **)ptr_pam_user); 6311305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (sshpam_err == PAM_SUCCESS && strcmp(user, pam_user) == 0) 6321305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (0); 6331305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood pam_end(sshpam_handle, sshpam_err); 6341305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_handle = NULL; 6351305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 6361305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood debug("PAM: initializing for \"%s\"", user); 6371305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_err = 6381305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood pam_start(SSHD_PAM_SERVICE, user, &store_conv, &sshpam_handle); 6391305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_authctxt = authctxt; 6401305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 6411305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (sshpam_err != PAM_SUCCESS) { 6421305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood pam_end(sshpam_handle, sshpam_err); 6431305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_handle = NULL; 6441305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (-1); 6451305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 6461305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood pam_rhost = get_remote_name_or_ip(utmp_len, options.use_dns); 6471305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood debug("PAM: setting PAM_RHOST to \"%s\"", pam_rhost); 6481305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_err = pam_set_item(sshpam_handle, PAM_RHOST, pam_rhost); 6491305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (sshpam_err != PAM_SUCCESS) { 6501305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood pam_end(sshpam_handle, sshpam_err); 6511305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_handle = NULL; 6521305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (-1); 6531305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 6541305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#ifdef PAM_TTY_KLUDGE 6551305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood /* 6561305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * Some silly PAM modules (e.g. pam_time) require a TTY to operate. 6571305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * sshd doesn't set the tty until too late in the auth process and 6581305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * may not even set one (for tty-less connections) 6591305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood */ 6601305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood debug("PAM: setting PAM_TTY to \"ssh\""); 6611305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_err = pam_set_item(sshpam_handle, PAM_TTY, "ssh"); 6621305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (sshpam_err != PAM_SUCCESS) { 6631305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood pam_end(sshpam_handle, sshpam_err); 6641305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_handle = NULL; 6651305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (-1); 6661305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 6671305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#endif 6681305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (0); 6691305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood} 6701305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 6711305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodstatic void * 6721305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodsshpam_init_ctx(Authctxt *authctxt) 6731305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood{ 6741305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood struct pam_ctxt *ctxt; 6751305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood int socks[2]; 6761305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 6771305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood debug3("PAM: %s entering", __func__); 6781305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood /* 6791305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * Refuse to start if we don't have PAM enabled or do_pam_account 6801305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * has previously failed. 6811305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood */ 6821305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (!options.use_pam || sshpam_account_status == 0) 6831305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return NULL; 6841305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 6851305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood /* Initialize PAM */ 6861305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (sshpam_init(authctxt) == -1) { 6871305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood error("PAM: initialization failed"); 6881305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (NULL); 6891305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 6901305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 6911305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood ctxt = xcalloc(1, sizeof *ctxt); 6921305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 6931305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood /* Start the authentication thread */ 6941305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, socks) == -1) { 6951305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood error("PAM: failed create sockets: %s", strerror(errno)); 6961305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood xfree(ctxt); 6971305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (NULL); 6981305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 6991305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood ctxt->pam_psock = socks[0]; 7001305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood ctxt->pam_csock = socks[1]; 7011305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (pthread_create(&ctxt->pam_thread, NULL, sshpam_thread, ctxt) == -1) { 7021305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood error("PAM: failed to start authentication thread: %s", 7031305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood strerror(errno)); 7041305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood close(socks[0]); 7051305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood close(socks[1]); 7061305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood xfree(ctxt); 7071305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (NULL); 7081305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 7091305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood cleanup_ctxt = ctxt; 7101305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (ctxt); 7111305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood} 7121305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 7131305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodstatic int 7141305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodsshpam_query(void *ctx, char **name, char **info, 7151305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood u_int *num, char ***prompts, u_int **echo_on) 7161305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood{ 7171305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood Buffer buffer; 7181305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood struct pam_ctxt *ctxt = ctx; 7191305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood size_t plen; 7201305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood u_char type; 7211305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood char *msg; 7221305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood size_t len, mlen; 7231305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 7241305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood debug3("PAM: %s entering", __func__); 7251305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood buffer_init(&buffer); 7261305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood *name = xstrdup(""); 7271305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood *info = xstrdup(""); 7281305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood *prompts = xmalloc(sizeof(char *)); 7291305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood **prompts = NULL; 7301305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood plen = 0; 7311305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood *echo_on = xmalloc(sizeof(u_int)); 7321305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood while (ssh_msg_recv(ctxt->pam_psock, &buffer) == 0) { 7331305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood type = buffer_get_char(&buffer); 7341305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood msg = buffer_get_string(&buffer, NULL); 7351305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood mlen = strlen(msg); 7361305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood switch (type) { 7371305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood case PAM_PROMPT_ECHO_ON: 7381305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood case PAM_PROMPT_ECHO_OFF: 7391305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood *num = 1; 7401305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood len = plen + mlen + 1; 7411305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood **prompts = xrealloc(**prompts, 1, len); 7421305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood strlcpy(**prompts + plen, msg, len - plen); 7431305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood plen += mlen; 7441305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood **echo_on = (type == PAM_PROMPT_ECHO_ON); 7451305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood xfree(msg); 7461305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (0); 7471305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood case PAM_ERROR_MSG: 7481305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood case PAM_TEXT_INFO: 7491305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood /* accumulate messages */ 7501305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood len = plen + mlen + 2; 7511305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood **prompts = xrealloc(**prompts, 1, len); 7521305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood strlcpy(**prompts + plen, msg, len - plen); 7531305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood plen += mlen; 7541305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood strlcat(**prompts + plen, "\n", len - plen); 7551305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood plen++; 7561305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood xfree(msg); 7571305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood break; 7581305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood case PAM_ACCT_EXPIRED: 7591305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_account_status = 0; 7601305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood /* FALLTHROUGH */ 7611305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood case PAM_AUTH_ERR: 7621305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood debug3("PAM: %s", pam_strerror(sshpam_handle, type)); 7631305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (**prompts != NULL && strlen(**prompts) != 0) { 7641305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood *info = **prompts; 7651305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood **prompts = NULL; 7661305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood *num = 0; 7671305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood **echo_on = 0; 7681305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood ctxt->pam_done = -1; 7691305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood xfree(msg); 7701305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return 0; 7711305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 7721305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood /* FALLTHROUGH */ 7731305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood case PAM_SUCCESS: 7741305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (**prompts != NULL) { 7751305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood /* drain any accumulated messages */ 7761305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood debug("PAM: %s", **prompts); 7771305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood buffer_append(&loginmsg, **prompts, 7781305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood strlen(**prompts)); 7791305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood xfree(**prompts); 7801305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood **prompts = NULL; 7811305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 7821305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (type == PAM_SUCCESS) { 7831305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (!sshpam_authctxt->valid || 7841305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood (sshpam_authctxt->pw->pw_uid == 0 && 7851305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood options.permit_root_login != PERMIT_YES)) 7861305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood fatal("Internal error: PAM auth " 7871305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood "succeeded when it should have " 7881305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood "failed"); 7891305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood import_environments(&buffer); 7901305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood *num = 0; 7911305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood **echo_on = 0; 7921305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood ctxt->pam_done = 1; 7931305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood xfree(msg); 7941305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (0); 7951305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 7961305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood error("PAM: %s for %s%.100s from %.100s", msg, 7971305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_authctxt->valid ? "" : "illegal user ", 7981305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_authctxt->user, 7991305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood get_remote_name_or_ip(utmp_len, options.use_dns)); 8001305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood /* FALLTHROUGH */ 8011305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood default: 8021305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood *num = 0; 8031305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood **echo_on = 0; 8041305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood xfree(msg); 8051305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood ctxt->pam_done = -1; 8061305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (-1); 8071305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 8081305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 8091305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (-1); 8101305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood} 8111305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 8121305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood/* XXX - see also comment in auth-chall.c:verify_response */ 8131305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodstatic int 8141305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodsshpam_respond(void *ctx, u_int num, char **resp) 8151305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood{ 8161305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood Buffer buffer; 8171305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood struct pam_ctxt *ctxt = ctx; 8181305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 8191305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood debug2("PAM: %s entering, %u responses", __func__, num); 8201305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood switch (ctxt->pam_done) { 8211305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood case 1: 8221305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_authenticated = 1; 8231305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (0); 8241305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood case 0: 8251305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood break; 8261305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood default: 8271305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (-1); 8281305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 8291305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (num != 1) { 8301305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood error("PAM: expected one response, got %u", num); 8311305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (-1); 8321305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 8331305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood buffer_init(&buffer); 8341305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (sshpam_authctxt->valid && 8351305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood (sshpam_authctxt->pw->pw_uid != 0 || 8361305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood options.permit_root_login == PERMIT_YES)) 8371305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood buffer_put_cstring(&buffer, *resp); 8381305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood else 8391305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood buffer_put_cstring(&buffer, badpw); 8401305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (ssh_msg_send(ctxt->pam_psock, PAM_AUTHTOK, &buffer) == -1) { 8411305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood buffer_free(&buffer); 8421305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (-1); 8431305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 8441305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood buffer_free(&buffer); 8451305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (1); 8461305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood} 8471305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 8481305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodstatic void 8491305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodsshpam_free_ctx(void *ctxtp) 8501305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood{ 8511305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood struct pam_ctxt *ctxt = ctxtp; 8521305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 8531305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood debug3("PAM: %s entering", __func__); 8541305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_thread_cleanup(); 8551305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood xfree(ctxt); 8561305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood /* 8571305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * We don't call sshpam_cleanup() here because we may need the PAM 8581305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * handle at a later stage, e.g. when setting up a session. It's 8591305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * still on the cleanup list, so pam_end() *will* be called before 8601305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * the server process terminates. 8611305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood */ 8621305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood} 8631305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 8641305e95ba6ff9fa202d0818caf10405df4b0f648Mike LockwoodKbdintDevice sshpam_device = { 8651305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood "pam", 8661305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_init_ctx, 8671305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_query, 8681305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_respond, 8691305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_free_ctx 8701305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood}; 8711305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 8721305e95ba6ff9fa202d0818caf10405df4b0f648Mike LockwoodKbdintDevice mm_sshpam_device = { 8731305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood "pam", 8741305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood mm_sshpam_init_ctx, 8751305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood mm_sshpam_query, 8761305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood mm_sshpam_respond, 8771305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood mm_sshpam_free_ctx 8781305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood}; 8791305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 8801305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood/* 8811305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * This replaces auth-pam.c 8821305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood */ 8831305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodvoid 8841305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodstart_pam(Authctxt *authctxt) 8851305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood{ 8861305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (!options.use_pam) 8871305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood fatal("PAM: initialisation requested when UsePAM=no"); 8881305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 8891305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (sshpam_init(authctxt) == -1) 8901305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood fatal("PAM: initialisation failed"); 8911305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood} 8921305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 8931305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodvoid 8941305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodfinish_pam(void) 8951305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood{ 8961305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_cleanup(); 8971305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood} 8981305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 8991305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodu_int 9001305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwooddo_pam_account(void) 9011305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood{ 9021305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood debug("%s: called", __func__); 9031305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (sshpam_account_status != -1) 9041305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (sshpam_account_status); 9051305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 9061305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_err = pam_acct_mgmt(sshpam_handle, 0); 9071305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood debug3("PAM: %s pam_acct_mgmt = %d (%s)", __func__, sshpam_err, 9081305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood pam_strerror(sshpam_handle, sshpam_err)); 9091305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 9101305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (sshpam_err != PAM_SUCCESS && sshpam_err != PAM_NEW_AUTHTOK_REQD) { 9111305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_account_status = 0; 9121305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (sshpam_account_status); 9131305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 9141305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 9151305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (sshpam_err == PAM_NEW_AUTHTOK_REQD) 9161305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_password_change_required(1); 9171305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 9181305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_account_status = 1; 9191305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (sshpam_account_status); 9201305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood} 9211305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 9221305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodvoid 9231305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwooddo_pam_set_tty(const char *tty) 9241305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood{ 9251305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (tty != NULL) { 9261305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood debug("PAM: setting PAM_TTY to \"%s\"", tty); 9271305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_err = pam_set_item(sshpam_handle, PAM_TTY, tty); 9281305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (sshpam_err != PAM_SUCCESS) 9291305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood fatal("PAM: failed to set PAM_TTY: %s", 9301305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood pam_strerror(sshpam_handle, sshpam_err)); 9311305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 9321305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood} 9331305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 9341305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodvoid 9351305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwooddo_pam_setcred(int init) 9361305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood{ 9371305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_err = pam_set_item(sshpam_handle, PAM_CONV, 9381305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood (const void *)&store_conv); 9391305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (sshpam_err != PAM_SUCCESS) 9401305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood fatal("PAM: failed to set PAM_CONV: %s", 9411305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood pam_strerror(sshpam_handle, sshpam_err)); 9421305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (init) { 9431305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood debug("PAM: establishing credentials"); 9441305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_err = pam_setcred(sshpam_handle, PAM_ESTABLISH_CRED); 9451305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } else { 9461305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood debug("PAM: reinitializing credentials"); 9471305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_err = pam_setcred(sshpam_handle, PAM_REINITIALIZE_CRED); 9481305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 9491305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (sshpam_err == PAM_SUCCESS) { 9501305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_cred_established = 1; 9511305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return; 9521305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 9531305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (sshpam_authenticated) 9541305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood fatal("PAM: pam_setcred(): %s", 9551305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood pam_strerror(sshpam_handle, sshpam_err)); 9561305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood else 9571305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood debug("PAM: pam_setcred(): %s", 9581305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood pam_strerror(sshpam_handle, sshpam_err)); 9591305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood} 9601305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 9611305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodstatic int 9621305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodsshpam_tty_conv(int n, sshpam_const struct pam_message **msg, 9631305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood struct pam_response **resp, void *data) 9641305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood{ 9651305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood char input[PAM_MAX_MSG_SIZE]; 9661305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood struct pam_response *reply; 9671305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood int i; 9681305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 9691305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood debug3("PAM: %s called with %d messages", __func__, n); 9701305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 9711305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood *resp = NULL; 9721305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 9731305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (n <= 0 || n > PAM_MAX_NUM_MSG || !isatty(STDIN_FILENO)) 9741305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (PAM_CONV_ERR); 9751305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 9761305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if ((reply = calloc(n, sizeof(*reply))) == NULL) 9771305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (PAM_CONV_ERR); 9781305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 9791305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood for (i = 0; i < n; ++i) { 9801305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood switch (PAM_MSG_MEMBER(msg, i, msg_style)) { 9811305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood case PAM_PROMPT_ECHO_OFF: 9821305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood reply[i].resp = 9831305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood read_passphrase(PAM_MSG_MEMBER(msg, i, msg), 9841305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood RP_ALLOW_STDIN); 9851305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood reply[i].resp_retcode = PAM_SUCCESS; 9861305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood break; 9871305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood case PAM_PROMPT_ECHO_ON: 9881305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood fprintf(stderr, "%s\n", PAM_MSG_MEMBER(msg, i, msg)); 9891305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (fgets(input, sizeof input, stdin) == NULL) 9901305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood input[0] = '\0'; 9911305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if ((reply[i].resp = strdup(input)) == NULL) 9921305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood goto fail; 9931305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood reply[i].resp_retcode = PAM_SUCCESS; 9941305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood break; 9951305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood case PAM_ERROR_MSG: 9961305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood case PAM_TEXT_INFO: 9971305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood fprintf(stderr, "%s\n", PAM_MSG_MEMBER(msg, i, msg)); 9981305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood reply[i].resp_retcode = PAM_SUCCESS; 9991305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood break; 10001305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood default: 10011305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood goto fail; 10021305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 10031305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 10041305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood *resp = reply; 10051305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (PAM_SUCCESS); 10061305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 10071305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood fail: 10081305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood for(i = 0; i < n; i++) { 10091305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (reply[i].resp != NULL) 10101305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood xfree(reply[i].resp); 10111305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 10121305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood xfree(reply); 10131305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (PAM_CONV_ERR); 10141305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood} 10151305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 10161305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodstatic struct pam_conv tty_conv = { sshpam_tty_conv, NULL }; 10171305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 10181305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood/* 10191305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * XXX this should be done in the authentication phase, but ssh1 doesn't 10201305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * support that 10211305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood */ 10221305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodvoid 10231305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwooddo_pam_chauthtok(void) 10241305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood{ 10251305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (use_privsep) 10261305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood fatal("Password expired (unable to change with privsep)"); 10271305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_err = pam_set_item(sshpam_handle, PAM_CONV, 10281305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood (const void *)&tty_conv); 10291305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (sshpam_err != PAM_SUCCESS) 10301305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood fatal("PAM: failed to set PAM_CONV: %s", 10311305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood pam_strerror(sshpam_handle, sshpam_err)); 10321305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood debug("PAM: changing password"); 10331305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_err = pam_chauthtok(sshpam_handle, PAM_CHANGE_EXPIRED_AUTHTOK); 10341305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (sshpam_err != PAM_SUCCESS) 10351305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood fatal("PAM: pam_chauthtok(): %s", 10361305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood pam_strerror(sshpam_handle, sshpam_err)); 10371305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood} 10381305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 10391305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodvoid 10401305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwooddo_pam_session(void) 10411305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood{ 10421305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood debug3("PAM: opening session"); 10431305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_err = pam_set_item(sshpam_handle, PAM_CONV, 10441305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood (const void *)&store_conv); 10451305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (sshpam_err != PAM_SUCCESS) 10461305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood fatal("PAM: failed to set PAM_CONV: %s", 10471305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood pam_strerror(sshpam_handle, sshpam_err)); 10481305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_err = pam_open_session(sshpam_handle, 0); 10491305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (sshpam_err == PAM_SUCCESS) 10501305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_session_open = 1; 10511305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood else { 10521305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_session_open = 0; 10531305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood disable_forwarding(); 10541305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood error("PAM: pam_open_session(): %s", 10551305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood pam_strerror(sshpam_handle, sshpam_err)); 10561305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 10571305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 10581305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood} 10591305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 10601305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodint 10611305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodis_pam_session_open(void) 10621305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood{ 10631305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return sshpam_session_open; 10641305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood} 10651305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 10661305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood/* 10671305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * Set a PAM environment string. We need to do this so that the session 10681305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * modules can handle things like Kerberos/GSI credentials that appear 10691305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * during the ssh authentication process. 10701305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood */ 10711305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodint 10721305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwooddo_pam_putenv(char *name, char *value) 10731305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood{ 10741305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood int ret = 1; 10751305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#ifdef HAVE_PAM_PUTENV 10761305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood char *compound; 10771305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood size_t len; 10781305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 10791305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood len = strlen(name) + strlen(value) + 2; 10801305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood compound = xmalloc(len); 10811305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 10821305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood snprintf(compound, len, "%s=%s", name, value); 10831305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood ret = pam_putenv(sshpam_handle, compound); 10841305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood xfree(compound); 10851305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#endif 10861305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 10871305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (ret); 10881305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood} 10891305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 10901305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodchar ** 10911305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodfetch_pam_child_environment(void) 10921305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood{ 10931305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return sshpam_env; 10941305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood} 10951305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 10961305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodchar ** 10971305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodfetch_pam_environment(void) 10981305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood{ 10991305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (pam_getenvlist(sshpam_handle)); 11001305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood} 11011305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 11021305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodvoid 11031305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodfree_pam_environment(char **env) 11041305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood{ 11051305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood char **envp; 11061305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 11071305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (env == NULL) 11081305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return; 11091305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 11101305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood for (envp = env; *envp; envp++) 11111305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood xfree(*envp); 11121305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood xfree(env); 11131305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood} 11141305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 11151305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood/* 11161305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * "Blind" conversation function for password authentication. Assumes that 11171305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * echo-off prompts are for the password and stores messages for later 11181305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * display. 11191305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood */ 11201305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodstatic int 11211305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodsshpam_passwd_conv(int n, sshpam_const struct pam_message **msg, 11221305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood struct pam_response **resp, void *data) 11231305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood{ 11241305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood struct pam_response *reply; 11251305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood int i; 11261305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood size_t len; 11271305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 11281305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood debug3("PAM: %s called with %d messages", __func__, n); 11291305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 11301305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood *resp = NULL; 11311305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 11321305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (n <= 0 || n > PAM_MAX_NUM_MSG) 11331305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (PAM_CONV_ERR); 11341305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 11351305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if ((reply = calloc(n, sizeof(*reply))) == NULL) 11361305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (PAM_CONV_ERR); 11371305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 11381305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood for (i = 0; i < n; ++i) { 11391305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood switch (PAM_MSG_MEMBER(msg, i, msg_style)) { 11401305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood case PAM_PROMPT_ECHO_OFF: 11411305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (sshpam_password == NULL) 11421305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood goto fail; 11431305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if ((reply[i].resp = strdup(sshpam_password)) == NULL) 11441305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood goto fail; 11451305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood reply[i].resp_retcode = PAM_SUCCESS; 11461305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood break; 11471305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood case PAM_ERROR_MSG: 11481305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood case PAM_TEXT_INFO: 11491305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood len = strlen(PAM_MSG_MEMBER(msg, i, msg)); 11501305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (len > 0) { 11511305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood buffer_append(&loginmsg, 11521305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood PAM_MSG_MEMBER(msg, i, msg), len); 11531305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood buffer_append(&loginmsg, "\n", 1); 11541305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 11551305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if ((reply[i].resp = strdup("")) == NULL) 11561305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood goto fail; 11571305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood reply[i].resp_retcode = PAM_SUCCESS; 11581305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood break; 11591305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood default: 11601305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood goto fail; 11611305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 11621305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 11631305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood *resp = reply; 11641305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (PAM_SUCCESS); 11651305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 11661305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood fail: 11671305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood for(i = 0; i < n; i++) { 11681305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (reply[i].resp != NULL) 11691305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood xfree(reply[i].resp); 11701305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 11711305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood xfree(reply); 11721305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (PAM_CONV_ERR); 11731305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood} 11741305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 11751305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodstatic struct pam_conv passwd_conv = { sshpam_passwd_conv, NULL }; 11761305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 11771305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood/* 11781305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * Attempt password authentication via PAM 11791305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood */ 11801305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodint 11811305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodsshpam_auth_passwd(Authctxt *authctxt, const char *password) 11821305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood{ 11831305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood int flags = (options.permit_empty_passwd == 0 ? 11841305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood PAM_DISALLOW_NULL_AUTHTOK : 0); 11851305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 11861305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (!options.use_pam || sshpam_handle == NULL) 11871305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood fatal("PAM: %s called when PAM disabled or failed to " 11881305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood "initialise.", __func__); 11891305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 11901305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_password = password; 11911305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_authctxt = authctxt; 11921305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 11931305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood /* 11941305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * If the user logging in is invalid, or is root but is not permitted 11951305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * by PermitRootLogin, use an invalid password to prevent leaking 11961305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * information via timing (eg if the PAM config has a delay on fail). 11971305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood */ 11981305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (!authctxt->valid || (authctxt->pw->pw_uid == 0 && 11991305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood options.permit_root_login != PERMIT_YES)) 12001305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_password = badpw; 12011305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 12021305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_err = pam_set_item(sshpam_handle, PAM_CONV, 12031305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood (const void *)&passwd_conv); 12041305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (sshpam_err != PAM_SUCCESS) 12051305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood fatal("PAM: %s: failed to set PAM_CONV: %s", __func__, 12061305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood pam_strerror(sshpam_handle, sshpam_err)); 12071305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 12081305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_err = pam_authenticate(sshpam_handle, flags); 12091305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood sshpam_password = NULL; 12101305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (sshpam_err == PAM_SUCCESS && authctxt->valid) { 12111305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood debug("PAM: password authentication accepted for %.100s", 12121305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood authctxt->user); 12131305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return 1; 12141305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } else { 12151305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood debug("PAM: password authentication failed for %.100s: %s", 12161305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood authctxt->valid ? authctxt->user : "an illegal user", 12171305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood pam_strerror(sshpam_handle, sshpam_err)); 12181305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return 0; 12191305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 12201305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood} 12211305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#endif /* USE_PAM */ 1222