service_manager.c revision d57d9b900da83b1b5431d90e250f86c0047c618a
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 1194afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood#include <private/android_filesystem_config.h> 1294afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 1369154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn#include <selinux/android.h> 147d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich#include <selinux/avc.h> 1569154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn 1694afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood#include "binder.h" 1794afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 1894afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood#if 0 1994afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood#define ALOGI(x...) fprintf(stderr, "svcmgr: " x) 2094afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood#define ALOGE(x...) fprintf(stderr, "svcmgr: " x) 2194afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood#else 2294afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood#define LOG_TAG "ServiceManager" 2394afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood#include <cutils/log.h> 2494afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood#endif 2594afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 268fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Robertsstruct audit_data { 278fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts pid_t pid; 288fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts uid_t uid; 298fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts const char *name; 308fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts}; 318fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts 327d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevichconst char *str8(const uint16_t *x, size_t x_len) 3394afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood{ 3494afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood static char buf[128]; 357d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich size_t max = 127; 3694afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood char *p = buf; 3794afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 387d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich if (x_len < max) { 397d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich max = x_len; 407d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich } 417d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich 4294afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood if (x) { 437d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich while ((max > 0) && (*x != '\0')) { 4494afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood *p++ = *x++; 457d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich max--; 4694afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood } 4794afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood } 4894afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood *p++ = 0; 4994afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood return buf; 5094afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood} 5194afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 529b738bb4110926b85da65d36b2e6f1a50199ec4cSerban Constantinescuint str16eq(const uint16_t *a, const char *b) 5394afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood{ 5494afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood while (*a && *b) 5594afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood if (*a++ != *b++) return 0; 5694afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood if (*a || *b) 5794afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood return 0; 5894afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood return 1; 5994afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood} 6094afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 61c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahnstatic int selinux_enabled; 62c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahnstatic char *service_manager_context; 6369154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahnstatic struct selabel_handle* sehandle; 6469154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn 658fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Robertsstatic bool check_mac_perms(pid_t spid, uid_t uid, const char *tctx, const char *perm, const char *name) 6669154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn{ 6769154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn char *sctx = NULL; 68c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn const char *class = "service_manager"; 69c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn bool allowed; 708fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts struct audit_data ad; 7169154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn 72c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn if (getpidcon(spid, &sctx) < 0) { 73c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn ALOGE("SELinux: getpidcon(pid=%d) failed to retrieve pid context.\n", spid); 7469154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn return false; 7569154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn } 7669154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn 778fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts ad.pid = spid; 788fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts ad.uid = uid; 798fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts ad.name = name; 808fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts 818fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts int result = selinux_check_access(sctx, tctx, class, perm, (void *) &ad); 82c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn allowed = (result == 0); 83c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn 84c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn freecon(sctx); 85c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn return allowed; 86c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn} 87c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn 888fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Robertsstatic bool check_mac_perms_from_getcon(pid_t spid, uid_t uid, const char *perm) 89c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn{ 90c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn if (selinux_enabled <= 0) { 91c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn return true; 9269154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn } 9369154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn 948fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts return check_mac_perms(spid, uid, service_manager_context, perm, NULL); 95c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn} 96c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn 978fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Robertsstatic bool check_mac_perms_from_lookup(pid_t spid, uid_t uid, const char *perm, const char *name) 98c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn{ 99c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn bool allowed; 100c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn char *tctx = NULL; 101c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn 102c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn if (selinux_enabled <= 0) { 103c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn return true; 10469154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn } 10569154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn 106c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn if (!sehandle) { 107c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn ALOGE("SELinux: Failed to find sehandle. Aborting service_manager.\n"); 108c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn abort(); 10969154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn } 11069154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn 111c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn if (selabel_lookup(sehandle, &tctx, name, 0) != 0) { 112c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn ALOGE("SELinux: No match for %s in service_contexts.\n", name); 11369154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn return false; 11469154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn } 11569154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn 1168fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts allowed = check_mac_perms(spid, uid, tctx, perm, name); 11769154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn freecon(tctx); 11869154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn return allowed; 11969154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn} 12069154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn 1218fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Robertsstatic int svc_can_register(const uint16_t *name, size_t name_len, pid_t spid, uid_t uid) 122c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn{ 123c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn const char *perm = "add"; 1248fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts return check_mac_perms_from_lookup(spid, uid, perm, str8(name, name_len)) ? 1 : 0; 125c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn} 126c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn 1278fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Robertsstatic int svc_can_list(pid_t spid, uid_t uid) 12894afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood{ 129c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn const char *perm = "list"; 1308fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts return check_mac_perms_from_getcon(spid, uid, perm) ? 1 : 0; 131c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn} 132c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn 1338fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Robertsstatic int svc_can_find(const uint16_t *name, size_t name_len, pid_t spid, uid_t uid) 134c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn{ 135c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn const char *perm = "find"; 1368fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts return check_mac_perms_from_lookup(spid, uid, perm, str8(name, name_len)) ? 1 : 0; 13794afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood} 13894afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 1399b738bb4110926b85da65d36b2e6f1a50199ec4cSerban Constantinescustruct svcinfo 14094afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood{ 14194afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood struct svcinfo *next; 1425fb1b8836aa5cf0f38b49bc7bfb8343b84fdf9bfSerban Constantinescu uint32_t handle; 14394afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood struct binder_death death; 14494afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood int allow_isolated; 1459b738bb4110926b85da65d36b2e6f1a50199ec4cSerban Constantinescu size_t len; 14694afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood uint16_t name[0]; 14794afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood}; 14894afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 1499b738bb4110926b85da65d36b2e6f1a50199ec4cSerban Constantinescustruct svcinfo *svclist = NULL; 15094afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 1519b738bb4110926b85da65d36b2e6f1a50199ec4cSerban Constantinescustruct svcinfo *find_svc(const uint16_t *s16, size_t len) 15294afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood{ 15394afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood struct svcinfo *si; 15494afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 15594afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood for (si = svclist; si; si = si->next) { 15694afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood if ((len == si->len) && 15794afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood !memcmp(s16, si->name, len * sizeof(uint16_t))) { 15894afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood return si; 15994afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood } 16094afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood } 1619b738bb4110926b85da65d36b2e6f1a50199ec4cSerban Constantinescu return NULL; 16294afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood} 16394afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 16494afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwoodvoid svcinfo_death(struct binder_state *bs, void *ptr) 16594afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood{ 1669b738bb4110926b85da65d36b2e6f1a50199ec4cSerban Constantinescu struct svcinfo *si = (struct svcinfo* ) ptr; 1679b738bb4110926b85da65d36b2e6f1a50199ec4cSerban Constantinescu 1687d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich ALOGI("service '%s' died\n", str8(si->name, si->len)); 1695fb1b8836aa5cf0f38b49bc7bfb8343b84fdf9bfSerban Constantinescu if (si->handle) { 1705fb1b8836aa5cf0f38b49bc7bfb8343b84fdf9bfSerban Constantinescu binder_release(bs, si->handle); 1715fb1b8836aa5cf0f38b49bc7bfb8343b84fdf9bfSerban Constantinescu si->handle = 0; 1729b738bb4110926b85da65d36b2e6f1a50199ec4cSerban Constantinescu } 17394afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood} 17494afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 1759b738bb4110926b85da65d36b2e6f1a50199ec4cSerban Constantinescuuint16_t svcmgr_id[] = { 17694afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 'a','n','d','r','o','i','d','.','o','s','.', 1779b738bb4110926b85da65d36b2e6f1a50199ec4cSerban Constantinescu 'I','S','e','r','v','i','c','e','M','a','n','a','g','e','r' 17894afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood}; 17994afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 1809b738bb4110926b85da65d36b2e6f1a50199ec4cSerban Constantinescu 181d57d9b900da83b1b5431d90e250f86c0047c618aIan Pedowitzuint32_t do_find_service(const uint16_t *s, size_t len, uid_t uid, pid_t spid) 18294afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood{ 183b27bbd18bb65b3744ae066fcd6826285dec8b469Nick Kralevich struct svcinfo *si = find_svc(s, len); 18494afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 185b27bbd18bb65b3744ae066fcd6826285dec8b469Nick Kralevich if (!si || !si->handle) { 186c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn return 0; 187c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn } 188b27bbd18bb65b3744ae066fcd6826285dec8b469Nick Kralevich 189b27bbd18bb65b3744ae066fcd6826285dec8b469Nick Kralevich if (!si->allow_isolated) { 190b27bbd18bb65b3744ae066fcd6826285dec8b469Nick Kralevich // If this service doesn't allow access from isolated processes, 191b27bbd18bb65b3744ae066fcd6826285dec8b469Nick Kralevich // then check the uid to see if it is isolated. 192b27bbd18bb65b3744ae066fcd6826285dec8b469Nick Kralevich uid_t appid = uid % AID_USER; 193b27bbd18bb65b3744ae066fcd6826285dec8b469Nick Kralevich if (appid >= AID_ISOLATED_START && appid <= AID_ISOLATED_END) { 194b27bbd18bb65b3744ae066fcd6826285dec8b469Nick Kralevich return 0; 19594afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood } 196b27bbd18bb65b3744ae066fcd6826285dec8b469Nick Kralevich } 197b27bbd18bb65b3744ae066fcd6826285dec8b469Nick Kralevich 1988fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts if (!svc_can_find(s, len, spid, uid)) { 19994afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood return 0; 20094afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood } 201b27bbd18bb65b3744ae066fcd6826285dec8b469Nick Kralevich 202b27bbd18bb65b3744ae066fcd6826285dec8b469Nick Kralevich return si->handle; 20394afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood} 20494afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 20594afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwoodint do_add_service(struct binder_state *bs, 2069b738bb4110926b85da65d36b2e6f1a50199ec4cSerban Constantinescu const uint16_t *s, size_t len, 20769154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn uint32_t handle, uid_t uid, int allow_isolated, 20869154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn pid_t spid) 20994afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood{ 21094afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood struct svcinfo *si; 2113a345f0df5f62d77e875a289e9aee89f0d1b526eSerban Constantinescu 2127d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich //ALOGI("add_service('%s',%x,%s) uid=%d\n", str8(s, len), handle, 21394afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood // allow_isolated ? "allow_isolated" : "!allow_isolated", uid); 21494afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 2155fb1b8836aa5cf0f38b49bc7bfb8343b84fdf9bfSerban Constantinescu if (!handle || (len == 0) || (len > 127)) 21694afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood return -1; 21794afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 2188fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts if (!svc_can_register(s, len, spid, uid)) { 2195fb1b8836aa5cf0f38b49bc7bfb8343b84fdf9bfSerban Constantinescu ALOGE("add_service('%s',%x) uid=%d - PERMISSION DENIED\n", 2207d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich str8(s, len), handle, uid); 22194afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood return -1; 22294afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood } 22394afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 22494afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood si = find_svc(s, len); 22594afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood if (si) { 2265fb1b8836aa5cf0f38b49bc7bfb8343b84fdf9bfSerban Constantinescu if (si->handle) { 2275fb1b8836aa5cf0f38b49bc7bfb8343b84fdf9bfSerban Constantinescu ALOGE("add_service('%s',%x) uid=%d - ALREADY REGISTERED, OVERRIDE\n", 2287d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich str8(s, len), handle, uid); 22994afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood svcinfo_death(bs, si); 23094afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood } 2315fb1b8836aa5cf0f38b49bc7bfb8343b84fdf9bfSerban Constantinescu si->handle = handle; 23294afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood } else { 23394afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood si = malloc(sizeof(*si) + (len + 1) * sizeof(uint16_t)); 23494afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood if (!si) { 2355fb1b8836aa5cf0f38b49bc7bfb8343b84fdf9bfSerban Constantinescu ALOGE("add_service('%s',%x) uid=%d - OUT OF MEMORY\n", 2367d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich str8(s, len), handle, uid); 23794afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood return -1; 23894afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood } 2395fb1b8836aa5cf0f38b49bc7bfb8343b84fdf9bfSerban Constantinescu si->handle = handle; 24094afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood si->len = len; 24194afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood memcpy(si->name, s, (len + 1) * sizeof(uint16_t)); 24294afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood si->name[len] = '\0'; 2439b738bb4110926b85da65d36b2e6f1a50199ec4cSerban Constantinescu si->death.func = (void*) svcinfo_death; 24494afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood si->death.ptr = si; 24594afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood si->allow_isolated = allow_isolated; 24694afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood si->next = svclist; 24794afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood svclist = si; 24894afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood } 24994afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 2505fb1b8836aa5cf0f38b49bc7bfb8343b84fdf9bfSerban Constantinescu binder_acquire(bs, handle); 2515fb1b8836aa5cf0f38b49bc7bfb8343b84fdf9bfSerban Constantinescu binder_link_to_death(bs, handle, &si->death); 25294afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood return 0; 25394afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood} 25494afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 25594afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwoodint svcmgr_handler(struct binder_state *bs, 256bcf38880c65297da58194eb0c0ce8d6e2bab7d94Serban Constantinescu struct binder_transaction_data *txn, 25794afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood struct binder_io *msg, 25894afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood struct binder_io *reply) 25994afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood{ 26094afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood struct svcinfo *si; 26194afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood uint16_t *s; 2629b738bb4110926b85da65d36b2e6f1a50199ec4cSerban Constantinescu size_t len; 2635fb1b8836aa5cf0f38b49bc7bfb8343b84fdf9bfSerban Constantinescu uint32_t handle; 26494afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood uint32_t strict_policy; 26594afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood int allow_isolated; 26694afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 2670b41ad5d6ec86cd2d481969dcff7e88f2805324fElliott Hughes //ALOGI("target=%p code=%d pid=%d uid=%d\n", 2680b41ad5d6ec86cd2d481969dcff7e88f2805324fElliott Hughes // (void*) txn->target.ptr, txn->code, txn->sender_pid, txn->sender_euid); 26994afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 2700b41ad5d6ec86cd2d481969dcff7e88f2805324fElliott Hughes if (txn->target.ptr != BINDER_SERVICE_MANAGER) 27194afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood return -1; 27294afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 273e5245cbf5d4e830cf605ef07f5d284d7c5d2867eArve Hjønnevåg if (txn->code == PING_TRANSACTION) 274e5245cbf5d4e830cf605ef07f5d284d7c5d2867eArve Hjønnevåg return 0; 275e5245cbf5d4e830cf605ef07f5d284d7c5d2867eArve Hjønnevåg 27694afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood // Equivalent to Parcel::enforceInterface(), reading the RPC 27794afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood // header with the strict mode policy mask and the interface name. 27894afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood // Note that we ignore the strict_policy and don't propagate it 27994afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood // further (since we do no outbound RPCs anyway). 28094afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood strict_policy = bio_get_uint32(msg); 28194afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood s = bio_get_string16(msg, &len); 2827d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich if (s == NULL) { 2837d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich return -1; 2847d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich } 2857d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich 28694afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood if ((len != (sizeof(svcmgr_id) / 2)) || 28794afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood memcmp(svcmgr_id, s, sizeof(svcmgr_id))) { 2887d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich fprintf(stderr,"invalid id %s\n", str8(s, len)); 28994afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood return -1; 29094afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood } 29194afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 29269154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn if (sehandle && selinux_status_updated() > 0) { 29369154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn struct selabel_handle *tmp_sehandle = selinux_android_service_context_handle(); 29469154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn if (tmp_sehandle) { 29569154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn selabel_close(sehandle); 29669154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn sehandle = tmp_sehandle; 29769154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn } 29869154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn } 29969154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn 30094afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood switch(txn->code) { 30194afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood case SVC_MGR_GET_SERVICE: 30294afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood case SVC_MGR_CHECK_SERVICE: 30394afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood s = bio_get_string16(msg, &len); 3047d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich if (s == NULL) { 3057d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich return -1; 3067d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich } 307d57d9b900da83b1b5431d90e250f86c0047c618aIan Pedowitz handle = do_find_service(s, len, txn->sender_euid, txn->sender_pid); 3085fb1b8836aa5cf0f38b49bc7bfb8343b84fdf9bfSerban Constantinescu if (!handle) 30994afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood break; 3105fb1b8836aa5cf0f38b49bc7bfb8343b84fdf9bfSerban Constantinescu bio_put_ref(reply, handle); 31194afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood return 0; 31294afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 31394afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood case SVC_MGR_ADD_SERVICE: 31494afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood s = bio_get_string16(msg, &len); 3157d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich if (s == NULL) { 3167d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich return -1; 3177d42a3c31ba78a418f9bdde0e0ab951469f321b5Nick Kralevich } 3185fb1b8836aa5cf0f38b49bc7bfb8343b84fdf9bfSerban Constantinescu handle = bio_get_ref(msg); 31994afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood allow_isolated = bio_get_uint32(msg) ? 1 : 0; 32069154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn if (do_add_service(bs, s, len, handle, txn->sender_euid, 32169154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn allow_isolated, txn->sender_pid)) 32294afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood return -1; 32394afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood break; 32494afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 32594afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood case SVC_MGR_LIST_SERVICES: { 3263a345f0df5f62d77e875a289e9aee89f0d1b526eSerban Constantinescu uint32_t n = bio_get_uint32(msg); 32794afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 3288fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts if (!svc_can_list(txn->sender_pid, txn->sender_euid)) { 329c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn ALOGE("list_service() uid=%d - PERMISSION DENIED\n", 330c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn txn->sender_euid); 331c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn return -1; 332c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn } 33394afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood si = svclist; 33494afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood while ((n-- > 0) && si) 33594afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood si = si->next; 33694afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood if (si) { 33794afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood bio_put_string16(reply, si->name); 33894afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood return 0; 33994afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood } 34094afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood return -1; 34194afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood } 34294afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood default: 34394afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood ALOGE("unknown code %d\n", txn->code); 34494afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood return -1; 34594afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood } 34694afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 34794afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood bio_put_uint32(reply, 0); 34894afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood return 0; 34994afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood} 35094afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 35169154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn 352d57d9b900da83b1b5431d90e250f86c0047c618aIan Pedowitzstatic int audit_callback(void *data, __unused security_class_t cls, char *buf, size_t len) 35369154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn{ 3548fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts struct audit_data *ad = (struct audit_data *)data; 3558fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts 3568fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts if (!ad || !ad->name) { 3578fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts ALOGE("No service manager audit data"); 3588fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts return 0; 3598fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts } 3608fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts 3618fb0f92e0fe3c286ebb120bae9e1570ee109fa12William Roberts snprintf(buf, len, "service=%s pid=%d uid=%d", ad->name, ad->pid, ad->uid); 36269154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn return 0; 36369154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn} 36469154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn 365d57d9b900da83b1b5431d90e250f86c0047c618aIan Pedowitzint main() 36694afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood{ 36794afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood struct binder_state *bs; 36894afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 36994afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood bs = binder_open(128*1024); 370a44542ca74b7da5b44ba30c205c3244805bb0600Serban Constantinescu if (!bs) { 371a44542ca74b7da5b44ba30c205c3244805bb0600Serban Constantinescu ALOGE("failed to open binder driver\n"); 372a44542ca74b7da5b44ba30c205c3244805bb0600Serban Constantinescu return -1; 373a44542ca74b7da5b44ba30c205c3244805bb0600Serban Constantinescu } 37494afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 37594afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood if (binder_become_context_manager(bs)) { 37694afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood ALOGE("cannot become context manager (%s)\n", strerror(errno)); 37794afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood return -1; 37894afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood } 37994afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood 380c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn selinux_enabled = is_selinux_enabled(); 38169154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn sehandle = selinux_android_service_context_handle(); 382bea0746b241d15626cf0a56828efc1d4640dbda7Stephen Smalley selinux_status_open(true); 38369154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn 384c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn if (selinux_enabled > 0) { 385c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn if (sehandle == NULL) { 386c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn ALOGE("SELinux: Failed to acquire sehandle. Aborting.\n"); 387c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn abort(); 388c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn } 389c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn 390c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn if (getcon(&service_manager_context) != 0) { 391c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn ALOGE("SELinux: Failed to acquire service_manager context. Aborting.\n"); 392c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn abort(); 393c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn } 394c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn } 395c67e6307cadb1f2cd876907c42d39b8374b93acdRiley Spahn 39669154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn union selinux_callback cb; 39769154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn cb.func_audit = audit_callback; 39869154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn selinux_set_callback(SELINUX_CB_AUDIT, cb); 39969154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn cb.func_log = selinux_log_callback; 40069154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn selinux_set_callback(SELINUX_CB_LOG, cb); 40169154df9efd3ffb7580b72a0138f58a2f5443db6Riley Spahn 40294afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood binder_loop(bs, svcmgr_handler); 4039b738bb4110926b85da65d36b2e6f1a50199ec4cSerban Constantinescu 40494afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood return 0; 40594afecf4b6f437b3ee9a076242402e421c6c07a6Mike Lockwood} 406