lib/util/setid.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    setXXid() functions for Samba.
   4    Copyright (C) Jeremy Allison 2012
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #ifndef AUTOCONF_TEST
  21 #include "replace.h"
  22 #include "system/passwd.h"
  23 #include "include/includes.h"
  24
  25 #ifdef UID_WRAPPER_REPLACE
  26
  27 #ifdef samba_seteuid
  28 #undef samba_seteuid
  29 #endif
  30
  31 #ifdef samba_setreuid
  32 #undef samba_setreuid
  33 #endif
  34
  35 #ifdef samba_setresuid
  36 #undef samba_setresuid
  37 #endif
  38
  39 #ifdef samba_setegid
  40 #undef samba_setegid
  41 #endif
  42
  43 #ifdef samba_setregid
  44 #undef samba_setregid
  45 #endif
  46
  47 #ifdef samba_setresgid
  48 #undef samba_setresgid
  49 #endif
  50
  51 #ifdef samba_setgroups
  52 #undef samba_setgroups
  53 #endif
  54
  55 /* uid_wrapper will have redefined these. */
  56 int samba_setresuid(uid_t ruid, uid_t euid, uid_t suid);
  57 int samba_setresgid(gid_t rgid, gid_t egid, gid_t sgid);
  58 int samba_setreuid(uid_t ruid, uid_t euid);
  59 int samba_setregid(gid_t rgid, gid_t egid);
  60 int samba_seteuid(uid_t euid);
  61 int samba_setegid(gid_t egid);
  62 int samba_setuid(uid_t uid);
  63 int samba_setgid(gid_t gid);
  64 int samba_setuidx(int flags, uid_t uid);
  65 int samba_setgidx(int flags, gid_t gid);
  66 int samba_setgroups(size_t setlen, const gid_t *gidset);
  67 #endif
  68
  69 #include "../lib/util/setid.h"
  70
  71 #else
  72
  73 /* Inside autoconf test. */
  74 #if defined(HAVE_UNISTD_H)
  75 #include <unistd.h>
  76 #endif
  77 #include <stdlib.h>
  78 #include <stdio.h>
  79 #include <sys/types.h>
  80 #include <errno.h>
  81
  82 #ifdef HAVE_SYS_PRIV_H
  83 #include <sys/priv.h>
  84 #endif
  85 #ifdef HAVE_SYS_ID_H
  86 #include <sys/id.h>
  87 #endif
  88
  89 /* autoconf tests don't include setid.h */
  90 int samba_setresuid(uid_t ruid, uid_t euid, uid_t suid);
  91 int samba_setresgid(gid_t rgid, gid_t egid, gid_t sgid);
  92 int samba_setreuid(uid_t ruid, uid_t euid);
  93 int samba_setregid(gid_t rgid, gid_t egid);
  94 int samba_seteuid(uid_t euid);
  95 int samba_setegid(gid_t egid);
  96 int samba_setuid(uid_t uid);
  97 int samba_setgid(gid_t gid);
  98 int samba_setuidx(int flags, uid_t uid);
  99 int samba_setgidx(int flags, gid_t gid);
 100 int samba_setgroups(size_t setlen, const gid_t *gidset);
 101
 102 #endif
 103
 104 #if defined(USE_LINUX_THREAD_CREDENTIALS)
 105 #if defined(HAVE_SYSCALL_H)
 106 #include <syscall.h>
 107 #endif
 108
 109 #if defined(HAVE_SYS_SYSCALL_H)
 110 #include <sys/syscall.h>
 111 #endif
 112 #endif
 113
 114 /* All the setXX[ug]id functions and setgroups Samba uses. */
 115 int samba_setresuid(uid_t ruid, uid_t euid, uid_t suid)
 116 {
 117 #if defined(USE_LINUX_THREAD_CREDENTIALS)
 118         return syscall(SYS_setresuid, ruid, euid, suid);
 119 #elif defined(HAVE_SETRESUID)
 120         return setresuid(ruid, euid, suid);
 121 #else
 122         errno = ENOSYS;
 123         return -1;
 124 #endif
 125 }
 126
 127 int samba_setresgid(gid_t rgid, gid_t egid, gid_t sgid)
 128 {
 129 #if defined(USE_LINUX_THREAD_CREDENTIALS)
 130         return syscall(SYS_setresgid, rgid, egid, sgid);
 131 #elif defined(HAVE_SETRESGID)
 132         return setresgid(rgid, egid, sgid);
 133 #else
 134         errno = ENOSYS;
 135         return -1;
 136 #endif
 137 }
 138
 139 int samba_setreuid(uid_t ruid, uid_t euid)
 140 {
 141 #if defined(USE_LINUX_THREAD_CREDENTIALS)
 142         return syscall(SYS_setreuid, ruid, euid);
 143 #elif defined(HAVE_SETREUID)
 144         return setreuid(ruid, euid);
 145 #else
 146         errno = ENOSYS;
 147         return -1;
 148 #endif
 149 }
 150
 151 int samba_setregid(gid_t rgid, gid_t egid)
 152 {
 153 #if defined(USE_LINUX_THREAD_CREDENTIALS)
 154         return syscall(SYS_setregid, rgid, egid);
 155 #elif defined(HAVE_SETREGID)
 156         return setregid(rgid, egid);
 157 #else
 158         errno = ENOSYS;
 159         return -1;
 160 #endif
 161 }
 162
 163 int samba_seteuid(uid_t euid)
 164 {
 165 #if defined(USE_LINUX_THREAD_CREDENTIALS)
 166         /* seteuid is not a separate system call. */
 167         return syscall(SYS_setresuid, -1, euid, -1);
 168 #elif defined(HAVE_SETEUID)
 169         return seteuid(euid);
 170 #else
 171         errno = ENOSYS;
 172         return -1;
 173 #endif
 174 }
 175
 176 int samba_setegid(gid_t egid)
 177 {
 178 #if defined(USE_LINUX_THREAD_CREDENTIALS)
 179         /* setegid is not a separate system call. */
 180         return syscall(SYS_setresgid, -1, egid, -1);
 181 #elif defined(HAVE_SETEGID)
 182         return setegid(egid);
 183 #else
 184         errno = ENOSYS;
 185         return -1;
 186 #endif
 187 }
 188
 189 int samba_setuid(uid_t uid)
 190 {
 191 #if defined(USE_LINUX_THREAD_CREDENTIALS)
 192         return syscall(SYS_setuid, uid);
 193 #elif defined(HAVE_SETUID)
 194         return setuid(uid);
 195 #else
 196         errno = ENOSYS;
 197         return -1;
 198 #endif
 199 }
 200
 201 int samba_setgid(gid_t gid)
 202 {
 203 #if defined(USE_LINUX_THREAD_CREDENTIALS)
 204         return syscall(SYS_setgid, gid);
 205 #elif defined(HAVE_SETGID)
 206         return setgid(gid);
 207 #else
 208         errno = ENOSYS;
 209         return -1;
 210 #endif
 211 }
 212
 213 int samba_setuidx(int flags, uid_t uid)
 214 {
 215 #if defined(HAVE_SETUIDX)
 216         return setuidx(flags, uid);
 217 #else
 218         /* USE_LINUX_THREAD_CREDENTIALS doesn't have this. */
 219         errno = ENOSYS;
 220         return -1;
 221 #endif
 222 }
 223
 224 int samba_setgidx(int flags, gid_t gid)
 225 {
 226 #if defined(HAVE_SETGIDX)
 227         return setgidx(flags, gid);
 228 #else
 229         /* USE_LINUX_THREAD_CREDENTIALS doesn't have this. */
 230         errno = ENOSYS;
 231         return -1;
 232 #endif
 233 }
 234
 235 int samba_setgroups(size_t setlen, const gid_t *gidset)
 236 {
 237 #if defined(USE_LINUX_THREAD_CREDENTIALS)
 238         return syscall(SYS_setgroups, setlen, gidset);
 239 #elif defined(HAVE_SETGROUPS)
 240         return setgroups(setlen, gidset);
 241 #else
 242         errno = ENOSYS;
 243         return -1;
 244 #endif
 245 }