service_manager.c revision 6b9c6d23f69a64f76fc26cda6989183042b0621c
194afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood/* Copyright 2008 The Android Open Source Project 294afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood */ 394afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 494afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood#include <errno.h> 594afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood#include <fcntl.h> 60b41ad5d6ec86cd2d481969dcff7e88f2805324fElliott Hughes#include <inttypes.h> 713df5f5f8fbc5a3fdfdd5d1ba5dc853cf3f017f0Mark Salyzyn#include <stdio.h> 813df5f5f8fbc5a3fdfdd5d1ba5dc853cf3f017f0Mark Salyzyn#include <stdlib.h> 913df5f5f8fbc5a3fdfdd5d1ba5dc853cf3f017f0Mark Salyzyn#include <string.h> 1094afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 116b9c6d23f69a64f76fc26cda6989183042b0621cArve Hjønnevåg#include <cutils/multiuser.h> 126b9c6d23f69a64f76fc26cda6989183042b0621cArve Hjønnevåg 1394afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood#include <private/android_filesystem_config.h> 1494afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 1569154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn#include <selinux/android.h> 167d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich#include <selinux/avc.h> 1769154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn 1894afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood#include "binder.h" 1994afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 2094afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood#if 0 2194afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood#define ALOGI(x...) fprintf(stderr, "svcmgr: " x) 2294afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood#define ALOGE(x...) fprintf(stderr, "svcmgr: " x) 2394afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood#else 2494afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood#define LOG_TAG "ServiceManager" 2594afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood#include <cutils/log.h> 2694afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood#endif 2794afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 288fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Robertsstruct audit_data { 298fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts pid_t pid; 308fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts uid_t uid; 318fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts const char *name; 328fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts}; 338fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts 347d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevichconst char *str8(const uint16_t *x, size_t x_len) 3594afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood{ 3694afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood static char buf[128]; 377d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich size_t max = 127; 3894afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood char *p = buf; 3994afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 407d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich if (x_len < max) { 417d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich max = x_len; 427d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich } 437d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich 4494afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood if (x) { 457d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich while ((max > 0) && (*x != '\0')) { 4694afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood *p++ = *x++; 477d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich max--; 4894afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood } 4994afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood } 5094afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood *p++ = 0; 5194afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood return buf; 5294afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood} 5394afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 549b738bb4110926b85da65d36b2e6f1a50199ec4cSerban Constantinescuint str16eq(const uint16_t *a, const char *b) 5594afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood{ 5694afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood while (*a && *b) 5794afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood if (*a++ != *b++) return 0; 5894afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood if (*a || *b) 5994afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood return 0; 6094afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood return 1; 6194afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood} 6294afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 63c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahnstatic int selinux_enabled; 64c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahnstatic char *service_manager_context; 6569154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahnstatic struct selabel_handle* sehandle; 6669154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn 678fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Robertsstatic bool check_mac_perms(pid_t spid, uid_t uid, const char *tctx, const char *perm, const char *name) 6869154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn{ 6969154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn char *sctx = NULL; 70c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn const char *class = "service_manager"; 71c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn bool allowed; 728fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts struct audit_data ad; 7369154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn 74c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn if (getpidcon(spid, &sctx) < 0) { 75c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn ALOGE("SELinux: getpidcon(pid=%d) failed to retrieve pid context.\n", spid); 7669154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn return false; 7769154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn } 7869154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn 798fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts ad.pid = spid; 808fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts ad.uid = uid; 818fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts ad.name = name; 828fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts 838fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts int result = selinux_check_access(sctx, tctx, class, perm, (void *) &ad); 84c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn allowed = (result == 0); 85c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn 86c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn freecon(sctx); 87c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn return allowed; 88c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn} 89c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn 908fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Robertsstatic bool check_mac_perms_from_getcon(pid_t spid, uid_t uid, const char *perm) 91c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn{ 92c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn if (selinux_enabled <= 0) { 93c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn return true; 9469154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn } 9569154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn 968fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts return check_mac_perms(spid, uid, service_manager_context, perm, NULL); 97c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn} 98c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn 998fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Robertsstatic bool check_mac_perms_from_lookup(pid_t spid, uid_t uid, const char *perm, const char *name) 100c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn{ 101c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn bool allowed; 102c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn char *tctx = NULL; 103c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn 104c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn if (selinux_enabled <= 0) { 105c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn return true; 10669154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn } 10769154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn 108c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn if (!sehandle) { 109c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn ALOGE("SELinux: Failed to find sehandle. Aborting service_manager.\n"); 110c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn abort(); 11169154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn } 11269154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn 113c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn if (selabel_lookup(sehandle, &tctx, name, 0) != 0) { 114c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn ALOGE("SELinux: No match for %s in service_contexts.\n", name); 11569154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn return false; 11669154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn } 11769154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn 1188fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts allowed = check_mac_perms(spid, uid, tctx, perm, name); 11969154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn freecon(tctx); 12069154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn return allowed; 12169154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn} 12269154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn 1238fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Robertsstatic int svc_can_register(const uint16_t *name, size_t name_len, pid_t spid, uid_t uid) 124c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn{ 125c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn const char *perm = "add"; 1265fa90a063f77054fc6068f45f6a21f43d64364b6Arve Hjønnevåg 1276b9c6d23f69a64f76fc26cda6989183042b0621cArve Hjønnevåg if (multiuser_get_app_id(uid) >= AID_APP) { 1285fa90a063f77054fc6068f45f6a21f43d64364b6Arve Hjønnevåg return 0; /* Don't allow apps to register services */ 1295fa90a063f77054fc6068f45f6a21f43d64364b6Arve Hjønnevåg } 1305fa90a063f77054fc6068f45f6a21f43d64364b6Arve Hjønnevåg 1318fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts return check_mac_perms_from_lookup(spid, uid, perm, str8(name, name_len)) ? 1 : 0; 132c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn} 133c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn 1348fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Robertsstatic int svc_can_list(pid_t spid, uid_t uid) 13594afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood{ 136c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn const char *perm = "list"; 1378fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts return check_mac_perms_from_getcon(spid, uid, perm) ? 1 : 0; 138c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn} 139c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn 1408fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Robertsstatic int svc_can_find(const uint16_t *name, size_t name_len, pid_t spid, uid_t uid) 141c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn{ 142c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn const char *perm = "find"; 1438fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts return check_mac_perms_from_lookup(spid, uid, perm, str8(name, name_len)) ? 1 : 0; 14494afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood} 14594afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 1469b738bb4110926b85da65d36b2e6f1a50199ec4cSerban Constantinescustruct svcinfo 14794afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood{ 14894afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood struct svcinfo *next; 1495fb1b8836aa5cf0f38b49bc7bfb8343b84fdf9bfSerban Constantinescu uint32_t handle; 15094afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood struct binder_death death; 15194afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood int allow_isolated; 1529b738bb4110926b85da65d36b2e6f1a50199ec4cSerban Constantinescu size_t len; 15394afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood uint16_t name[0]; 15494afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood}; 15594afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 1569b738bb4110926b85da65d36b2e6f1a50199ec4cSerban Constantinescustruct svcinfo *svclist = NULL; 15794afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 1589b738bb4110926b85da65d36b2e6f1a50199ec4cSerban Constantinescustruct svcinfo *find_svc(const uint16_t *s16, size_t len) 15994afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood{ 16094afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood struct svcinfo *si; 16194afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 16294afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood for (si = svclist; si; si = si->next) { 16394afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood if ((len == si->len) && 16494afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood !memcmp(s16, si->name, len * sizeof(uint16_t))) { 16594afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood return si; 16694afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood } 16794afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood } 1689b738bb4110926b85da65d36b2e6f1a50199ec4cSerban Constantinescu return NULL; 16994afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood} 17094afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 17194afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwoodvoid svcinfo_death(struct binder_state *bs, void *ptr) 17294afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood{ 1739b738bb4110926b85da65d36b2e6f1a50199ec4cSerban Constantinescu struct svcinfo *si = (struct svcinfo* ) ptr; 1749b738bb4110926b85da65d36b2e6f1a50199ec4cSerban Constantinescu 1757d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich ALOGI("service '%s' died\n", str8(si->name, si->len)); 1765fb1b8836aa5cf0f38b49bc7bfb8343b84fdf9bfSerban Constantinescu if (si->handle) { 1775fb1b8836aa5cf0f38b49bc7bfb8343b84fdf9bfSerban Constantinescu binder_release(bs, si->handle); 1785fb1b8836aa5cf0f38b49bc7bfb8343b84fdf9bfSerban Constantinescu si->handle = 0; 1799b738bb4110926b85da65d36b2e6f1a50199ec4cSerban Constantinescu } 18094afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood} 18194afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 1829b738bb4110926b85da65d36b2e6f1a50199ec4cSerban Constantinescuuint16_t svcmgr_id[] = { 18394afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 'a','n','d','r','o','i','d','.','o','s','.', 1849b738bb4110926b85da65d36b2e6f1a50199ec4cSerban Constantinescu 'I','S','e','r','v','i','c','e','M','a','n','a','g','e','r' 18594afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood}; 18694afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 1879b738bb4110926b85da65d36b2e6f1a50199ec4cSerban Constantinescu 188d57d9b900da83b1b5431d90e250f86c0047c618aIan Pedowitzuint32_t do_find_service(const uint16_t *s, size_t len, uid_t uid, pid_t spid) 18994afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood{ 190b27bbd18bb65b3744ae066fcd6826285dec8b469Nick Kralevich struct svcinfo *si = find_svc(s, len); 19194afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 192b27bbd18bb65b3744ae066fcd6826285dec8b469Nick Kralevich if (!si || !si->handle) { 193c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn return 0; 194c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn } 195b27bbd18bb65b3744ae066fcd6826285dec8b469Nick Kralevich 196b27bbd18bb65b3744ae066fcd6826285dec8b469Nick Kralevich if (!si->allow_isolated) { 197b27bbd18bb65b3744ae066fcd6826285dec8b469Nick Kralevich // If this service doesn't allow access from isolated processes, 198b27bbd18bb65b3744ae066fcd6826285dec8b469Nick Kralevich // then check the uid to see if it is isolated. 199b27bbd18bb65b3744ae066fcd6826285dec8b469Nick Kralevich uid_t appid = uid % AID_USER; 200b27bbd18bb65b3744ae066fcd6826285dec8b469Nick Kralevich if (appid >= AID_ISOLATED_START && appid <= AID_ISOLATED_END) { 201b27bbd18bb65b3744ae066fcd6826285dec8b469Nick Kralevich return 0; 20294afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood } 203b27bbd18bb65b3744ae066fcd6826285dec8b469Nick Kralevich } 204b27bbd18bb65b3744ae066fcd6826285dec8b469Nick Kralevich 2058fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts if (!svc_can_find(s, len, spid, uid)) { 20694afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood return 0; 20794afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood } 208b27bbd18bb65b3744ae066fcd6826285dec8b469Nick Kralevich 209b27bbd18bb65b3744ae066fcd6826285dec8b469Nick Kralevich return si->handle; 21094afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood} 21194afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 21294afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwoodint do_add_service(struct binder_state *bs, 2139b738bb4110926b85da65d36b2e6f1a50199ec4cSerban Constantinescu const uint16_t *s, size_t len, 21469154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn uint32_t handle, uid_t uid, int allow_isolated, 21569154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn pid_t spid) 21694afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood{ 21794afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood struct svcinfo *si; 2183a345f0df5f62d77e875a289e9aee89f0d1b526eSerban Constantinescu 2197d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich //ALOGI("add_service('%s',%x,%s) uid=%d\n", str8(s, len), handle, 22094afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood // allow_isolated ? "allow_isolated" : "!allow_isolated", uid); 22194afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 2225fb1b8836aa5cf0f38b49bc7bfb8343b84fdf9bfSerban Constantinescu if (!handle || (len == 0) || (len > 127)) 22394afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood return -1; 22494afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 2258fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts if (!svc_can_register(s, len, spid, uid)) { 2265fb1b8836aa5cf0f38b49bc7bfb8343b84fdf9bfSerban Constantinescu ALOGE("add_service('%s',%x) uid=%d - PERMISSION DENIED\n", 2277d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich str8(s, len), handle, uid); 22894afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood return -1; 22994afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood } 23094afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 23194afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood si = find_svc(s, len); 23294afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood if (si) { 2335fb1b8836aa5cf0f38b49bc7bfb8343b84fdf9bfSerban Constantinescu if (si->handle) { 2345fb1b8836aa5cf0f38b49bc7bfb8343b84fdf9bfSerban Constantinescu ALOGE("add_service('%s',%x) uid=%d - ALREADY REGISTERED, OVERRIDE\n", 2357d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich str8(s, len), handle, uid); 23694afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood svcinfo_death(bs, si); 23794afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood } 2385fb1b8836aa5cf0f38b49bc7bfb8343b84fdf9bfSerban Constantinescu si->handle = handle; 23994afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood } else { 24094afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood si = malloc(sizeof(*si) + (len + 1) * sizeof(uint16_t)); 24194afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood if (!si) { 2425fb1b8836aa5cf0f38b49bc7bfb8343b84fdf9bfSerban Constantinescu ALOGE("add_service('%s',%x) uid=%d - OUT OF MEMORY\n", 2437d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich str8(s, len), handle, uid); 24494afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood return -1; 24594afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood } 2465fb1b8836aa5cf0f38b49bc7bfb8343b84fdf9bfSerban Constantinescu si->handle = handle; 24794afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood si->len = len; 24894afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood memcpy(si->name, s, (len + 1) * sizeof(uint16_t)); 24994afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood si->name[len] = '\0'; 2509b738bb4110926b85da65d36b2e6f1a50199ec4cSerban Constantinescu si->death.func = (void*) svcinfo_death; 25194afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood si->death.ptr = si; 25294afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood si->allow_isolated = allow_isolated; 25394afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood si->next = svclist; 25494afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood svclist = si; 25594afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood } 25694afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 2575fb1b8836aa5cf0f38b49bc7bfb8343b84fdf9bfSerban Constantinescu binder_acquire(bs, handle); 2585fb1b8836aa5cf0f38b49bc7bfb8343b84fdf9bfSerban Constantinescu binder_link_to_death(bs, handle, &si->death); 25994afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood return 0; 26094afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood} 26194afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 26294afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwoodint svcmgr_handler(struct binder_state *bs, 263bcf38880c65297da58194eb0c0ce8d6e2bab7d94Serban Constantinescu struct binder_transaction_data *txn, 26494afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood struct binder_io *msg, 26594afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood struct binder_io *reply) 26694afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood{ 26794afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood struct svcinfo *si; 26894afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood uint16_t *s; 2699b738bb4110926b85da65d36b2e6f1a50199ec4cSerban Constantinescu size_t len; 2705fb1b8836aa5cf0f38b49bc7bfb8343b84fdf9bfSerban Constantinescu uint32_t handle; 27194afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood uint32_t strict_policy; 27294afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood int allow_isolated; 27394afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 2740b41ad5d6ec86cd2d481969dcff7e88f2805324fElliott Hughes //ALOGI("target=%p code=%d pid=%d uid=%d\n", 2750b41ad5d6ec86cd2d481969dcff7e88f2805324fElliott Hughes // (void*) txn->target.ptr, txn->code, txn->sender_pid, txn->sender_euid); 27694afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 2770b41ad5d6ec86cd2d481969dcff7e88f2805324fElliott Hughes if (txn->target.ptr != BINDER_SERVICE_MANAGER) 27894afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood return -1; 27994afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 280e5245cbf5d4e830cf605ef07f5d284d7c5d2867eArve Hjønnevåg if (txn->code == PING_TRANSACTION) 281e5245cbf5d4e830cf605ef07f5d284d7c5d2867eArve Hjønnevåg return 0; 282e5245cbf5d4e830cf605ef07f5d284d7c5d2867eArve Hjønnevåg 28394afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood // Equivalent to Parcel::enforceInterface(), reading the RPC 28494afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood // header with the strict mode policy mask and the interface name. 28594afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood // Note that we ignore the strict_policy and don't propagate it 28694afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood // further (since we do no outbound RPCs anyway). 28794afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood strict_policy = bio_get_uint32(msg); 28894afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood s = bio_get_string16(msg, &len); 2897d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich if (s == NULL) { 2907d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich return -1; 2917d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich } 2927d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich 29394afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood if ((len != (sizeof(svcmgr_id) / 2)) || 29494afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood memcmp(svcmgr_id, s, sizeof(svcmgr_id))) { 2957d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich fprintf(stderr,"invalid id %s\n", str8(s, len)); 29694afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood return -1; 29794afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood } 29894afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 29969154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn if (sehandle && selinux_status_updated() > 0) { 30069154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn struct selabel_handle *tmp_sehandle = selinux_android_service_context_handle(); 30169154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn if (tmp_sehandle) { 30269154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn selabel_close(sehandle); 30369154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn sehandle = tmp_sehandle; 30469154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn } 30569154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn } 30669154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn 30794afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood switch(txn->code) { 30894afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood case SVC_MGR_GET_SERVICE: 30994afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood case SVC_MGR_CHECK_SERVICE: 31094afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood s = bio_get_string16(msg, &len); 3117d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich if (s == NULL) { 3127d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich return -1; 3137d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich } 314d57d9b900da83b1b5431d90e250f86c0047c618aIan Pedowitz handle = do_find_service(s, len, txn->sender_euid, txn->sender_pid); 3155fb1b8836aa5cf0f38b49bc7bfb8343b84fdf9bfSerban Constantinescu if (!handle) 31694afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood break; 3175fb1b8836aa5cf0f38b49bc7bfb8343b84fdf9bfSerban Constantinescu bio_put_ref(reply, handle); 31894afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood return 0; 31994afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 32094afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood case SVC_MGR_ADD_SERVICE: 32194afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood s = bio_get_string16(msg, &len); 3227d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich if (s == NULL) { 3237d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich return -1; 3247d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich } 3255fb1b8836aa5cf0f38b49bc7bfb8343b84fdf9bfSerban Constantinescu handle = bio_get_ref(msg); 32694afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood allow_isolated = bio_get_uint32(msg) ? 1 : 0; 32769154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn if (do_add_service(bs, s, len, handle, txn->sender_euid, 32869154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn allow_isolated, txn->sender_pid)) 32994afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood return -1; 33094afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood break; 33194afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 33294afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood case SVC_MGR_LIST_SERVICES: { 3333a345f0df5f62d77e875a289e9aee89f0d1b526eSerban Constantinescu uint32_t n = bio_get_uint32(msg); 33494afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 3358fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts if (!svc_can_list(txn->sender_pid, txn->sender_euid)) { 336c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn ALOGE("list_service() uid=%d - PERMISSION DENIED\n", 337c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn txn->sender_euid); 338c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn return -1; 339c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn } 34094afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood si = svclist; 34194afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood while ((n-- > 0) && si) 34294afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood si = si->next; 34394afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood if (si) { 34494afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood bio_put_string16(reply, si->name); 34594afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood return 0; 34694afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood } 34794afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood return -1; 34894afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood } 34994afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood default: 35094afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood ALOGE("unknown code %d\n", txn->code); 35194afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood return -1; 35294afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood } 35394afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 35494afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood bio_put_uint32(reply, 0); 35594afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood return 0; 35694afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood} 35794afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 35869154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn 359d57d9b900da83b1b5431d90e250f86c0047c618aIan Pedowitzstatic int audit_callback(void *data, __unused security_class_t cls, char *buf, size_t len) 36069154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn{ 3618fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts struct audit_data *ad = (struct audit_data *)data; 3628fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts 3638fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts if (!ad || !ad->name) { 3648fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts ALOGE("No service manager audit data"); 3658fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts return 0; 3668fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts } 3678fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts 3688fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts snprintf(buf, len, "service=%s pid=%d uid=%d", ad->name, ad->pid, ad->uid); 36969154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn return 0; 37069154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn} 37169154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn 372d57d9b900da83b1b5431d90e250f86c0047c618aIan Pedowitzint main() 37394afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood{ 37494afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood struct binder_state *bs; 37594afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 37694afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood bs = binder_open(128*1024); 377a44542ca74b7da5b44ba30c205c3244805bb0600Serban Constantinescu if (!bs) { 378a44542ca74b7da5b44ba30c205c3244805bb0600Serban Constantinescu ALOGE("failed to open binder driver\n"); 379a44542ca74b7da5b44ba30c205c3244805bb0600Serban Constantinescu return -1; 380a44542ca74b7da5b44ba30c205c3244805bb0600Serban Constantinescu } 38194afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 38294afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood if (binder_become_context_manager(bs)) { 38394afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood ALOGE("cannot become context manager (%s)\n", strerror(errno)); 38494afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood return -1; 38594afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood } 38694afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 387c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn selinux_enabled = is_selinux_enabled(); 38869154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn sehandle = selinux_android_service_context_handle(); 389bea0746b241d15626cf0a56828efc1d4640dbda7Stephen Smalley selinux_status_open(true); 39069154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn 391c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn if (selinux_enabled > 0) { 392c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn if (sehandle == NULL) { 393c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn ALOGE("SELinux: Failed to acquire sehandle. Aborting.\n"); 394c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn abort(); 395c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn } 396c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn 397c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn if (getcon(&service_manager_context) != 0) { 398c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn ALOGE("SELinux: Failed to acquire service_manager context. Aborting.\n"); 399c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn abort(); 400c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn } 401c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn } 402c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn 40369154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn union selinux_callback cb; 40469154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn cb.func_audit = audit_callback; 40569154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn selinux_set_callback(SELINUX_CB_AUDIT, cb); 40669154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn cb.func_log = selinux_log_callback; 40769154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn selinux_set_callback(SELINUX_CB_LOG, cb); 40869154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn 40994afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood binder_loop(bs, svcmgr_handler); 4109b738bb4110926b85da65d36b2e6f1a50199ec4cSerban Constantinescu 41194afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood return 0; 41294afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood} 413