Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 1 | /* $OpenBSD: uidswap.c,v 1.35 2006/08/03 03:34:42 deraadt Exp $ */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2 | /* |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
| 4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| 5 | * All rights reserved |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 6 | * Code for uid-swapping. |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 7 | * |
| 8 | * As far as I am concerned, the code I have written for this software |
| 9 | * can be used freely for any purpose. Any derived versions of this |
| 10 | * software must be clearly marked as such, and if the derived work is |
| 11 | * incompatible with the protocol description in the RFC file, it must be |
| 12 | * called by a name other than "ssh" or "Secure Shell". |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 13 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 14 | |
| 15 | #include "includes.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 16 | |
Damien Miller | 8dbffe7 | 2006-08-05 11:02:17 +1000 | [diff] [blame] | 17 | #include <sys/param.h> |
Darren Tucker | 3997249 | 2006-07-12 22:22:46 +1000 | [diff] [blame] | 18 | #include <errno.h> |
Damien Miller | 9f2abc4 | 2006-07-10 20:53:08 +1000 | [diff] [blame] | 19 | #include <pwd.h> |
Damien Miller | e3476ed | 2006-07-24 14:13:33 +1000 | [diff] [blame] | 20 | #include <string.h> |
Damien Miller | e6b3b61 | 2006-07-24 14:01:23 +1000 | [diff] [blame] | 21 | #include <unistd.h> |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 22 | #include <stdarg.h> |
Damien Miller | 9f2abc4 | 2006-07-10 20:53:08 +1000 | [diff] [blame] | 23 | |
Damien Miller | 427a1d5 | 2006-07-10 20:20:33 +1000 | [diff] [blame] | 24 | #include <grp.h> |
| 25 | |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 26 | #include "log.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 27 | #include "uidswap.h" |
Damien Miller | a811d9a | 2004-02-24 13:05:11 +1100 | [diff] [blame] | 28 | #include "xmalloc.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 29 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 30 | /* |
| 31 | * Note: all these functions must work in all of the following cases: |
| 32 | * 1. euid=0, ruid=0 |
| 33 | * 2. euid=0, ruid!=0 |
| 34 | * 3. euid!=0, ruid!=0 |
| 35 | * Additionally, they must work regardless of whether the system has |
| 36 | * POSIX saved uids or not. |
| 37 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 38 | |
Ben Lindstrom | 4468b26 | 2001-04-26 23:03:37 +0000 | [diff] [blame] | 39 | #if defined(_POSIX_SAVED_IDS) && !defined(BROKEN_SAVED_UIDS) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 40 | /* Lets assume that posix saved ids also work with seteuid, even though that |
| 41 | is not part of the posix specification. */ |
Ben Lindstrom | 4468b26 | 2001-04-26 23:03:37 +0000 | [diff] [blame] | 42 | #define SAVED_IDS_WORK_WITH_SETEUID |
| 43 | /* Saved effective uid. */ |
| 44 | static uid_t saved_euid = 0; |
| 45 | static gid_t saved_egid = 0; |
| 46 | #endif |
Ben Lindstrom | 768f975 | 2001-04-25 06:27:11 +0000 | [diff] [blame] | 47 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 48 | /* Saved effective uid. */ |
Ben Lindstrom | 3fcf1a2 | 2001-04-08 18:26:59 +0000 | [diff] [blame] | 49 | static int privileged = 0; |
| 50 | static int temporarily_use_uid_effective = 0; |
Damien Miller | a811d9a | 2004-02-24 13:05:11 +1100 | [diff] [blame] | 51 | static gid_t *saved_egroups = NULL, *user_groups = NULL; |
Ben Lindstrom | 3fcf1a2 | 2001-04-08 18:26:59 +0000 | [diff] [blame] | 52 | static int saved_egroupslen = -1, user_groupslen = -1; |
Ben Lindstrom | 768f975 | 2001-04-25 06:27:11 +0000 | [diff] [blame] | 53 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 54 | /* |
| 55 | * Temporarily changes to the given uid. If the effective user |
| 56 | * id is not root, this does nothing. This call cannot be nested. |
| 57 | */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 58 | void |
Ben Lindstrom | 3fcf1a2 | 2001-04-08 18:26:59 +0000 | [diff] [blame] | 59 | temporarily_use_uid(struct passwd *pw) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 60 | { |
Ben Lindstrom | 768f975 | 2001-04-25 06:27:11 +0000 | [diff] [blame] | 61 | /* Save the current euid, and egroups. */ |
Ben Lindstrom | 4468b26 | 2001-04-26 23:03:37 +0000 | [diff] [blame] | 62 | #ifdef SAVED_IDS_WORK_WITH_SETEUID |
Ben Lindstrom | 768f975 | 2001-04-25 06:27:11 +0000 | [diff] [blame] | 63 | saved_euid = geteuid(); |
Ben Lindstrom | 4468b26 | 2001-04-26 23:03:37 +0000 | [diff] [blame] | 64 | saved_egid = getegid(); |
Ben Lindstrom | 1fa330c | 2002-07-23 21:29:49 +0000 | [diff] [blame] | 65 | debug("temporarily_use_uid: %u/%u (e=%u/%u)", |
| 66 | (u_int)pw->pw_uid, (u_int)pw->pw_gid, |
| 67 | (u_int)saved_euid, (u_int)saved_egid); |
Darren Tucker | 2ea9b18 | 2005-02-22 17:57:13 +1100 | [diff] [blame] | 68 | #ifndef HAVE_CYGWIN |
Ben Lindstrom | 768f975 | 2001-04-25 06:27:11 +0000 | [diff] [blame] | 69 | if (saved_euid != 0) { |
| 70 | privileged = 0; |
| 71 | return; |
| 72 | } |
Darren Tucker | 2ea9b18 | 2005-02-22 17:57:13 +1100 | [diff] [blame] | 73 | #endif |
Ben Lindstrom | 4468b26 | 2001-04-26 23:03:37 +0000 | [diff] [blame] | 74 | #else |
| 75 | if (geteuid() != 0) { |
| 76 | privileged = 0; |
| 77 | return; |
| 78 | } |
| 79 | #endif /* SAVED_IDS_WORK_WITH_SETEUID */ |
| 80 | |
Ben Lindstrom | 768f975 | 2001-04-25 06:27:11 +0000 | [diff] [blame] | 81 | privileged = 1; |
| 82 | temporarily_use_uid_effective = 1; |
Damien Miller | a811d9a | 2004-02-24 13:05:11 +1100 | [diff] [blame] | 83 | |
| 84 | saved_egroupslen = getgroups(0, NULL); |
Ben Lindstrom | 768f975 | 2001-04-25 06:27:11 +0000 | [diff] [blame] | 85 | if (saved_egroupslen < 0) |
| 86 | fatal("getgroups: %.100s", strerror(errno)); |
Damien Miller | a811d9a | 2004-02-24 13:05:11 +1100 | [diff] [blame] | 87 | if (saved_egroupslen > 0) { |
| 88 | saved_egroups = xrealloc(saved_egroups, |
Damien Miller | 3681209 | 2006-03-26 14:22:47 +1100 | [diff] [blame] | 89 | saved_egroupslen, sizeof(gid_t)); |
Damien Miller | a811d9a | 2004-02-24 13:05:11 +1100 | [diff] [blame] | 90 | if (getgroups(saved_egroupslen, saved_egroups) < 0) |
| 91 | fatal("getgroups: %.100s", strerror(errno)); |
| 92 | } else { /* saved_egroupslen == 0 */ |
Darren Tucker | 2359aa9 | 2004-02-24 13:17:30 +1100 | [diff] [blame] | 93 | if (saved_egroups != NULL) |
Damien Miller | a811d9a | 2004-02-24 13:05:11 +1100 | [diff] [blame] | 94 | xfree(saved_egroups); |
| 95 | } |
Ben Lindstrom | 768f975 | 2001-04-25 06:27:11 +0000 | [diff] [blame] | 96 | |
| 97 | /* set and save the user's groups */ |
| 98 | if (user_groupslen == -1) { |
| 99 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) |
| 100 | fatal("initgroups: %s: %.100s", pw->pw_name, |
| 101 | strerror(errno)); |
Damien Miller | a811d9a | 2004-02-24 13:05:11 +1100 | [diff] [blame] | 102 | |
| 103 | user_groupslen = getgroups(0, NULL); |
Ben Lindstrom | 768f975 | 2001-04-25 06:27:11 +0000 | [diff] [blame] | 104 | if (user_groupslen < 0) |
| 105 | fatal("getgroups: %.100s", strerror(errno)); |
Damien Miller | a811d9a | 2004-02-24 13:05:11 +1100 | [diff] [blame] | 106 | if (user_groupslen > 0) { |
| 107 | user_groups = xrealloc(user_groups, |
Damien Miller | 3681209 | 2006-03-26 14:22:47 +1100 | [diff] [blame] | 108 | user_groupslen, sizeof(gid_t)); |
Damien Miller | a811d9a | 2004-02-24 13:05:11 +1100 | [diff] [blame] | 109 | if (getgroups(user_groupslen, user_groups) < 0) |
| 110 | fatal("getgroups: %.100s", strerror(errno)); |
| 111 | } else { /* user_groupslen == 0 */ |
| 112 | if (user_groups) |
| 113 | xfree(user_groups); |
| 114 | } |
Ben Lindstrom | 768f975 | 2001-04-25 06:27:11 +0000 | [diff] [blame] | 115 | } |
| 116 | /* Set the effective uid to the given (unprivileged) uid. */ |
Ben Lindstrom | f52373f | 2001-04-08 18:38:04 +0000 | [diff] [blame] | 117 | if (setgroups(user_groupslen, user_groups) < 0) |
Ben Lindstrom | 3fcf1a2 | 2001-04-08 18:26:59 +0000 | [diff] [blame] | 118 | fatal("setgroups: %.100s", strerror(errno)); |
Ben Lindstrom | 4468b26 | 2001-04-26 23:03:37 +0000 | [diff] [blame] | 119 | #ifndef SAVED_IDS_WORK_WITH_SETEUID |
| 120 | /* Propagate the privileged gid to all of our gids. */ |
| 121 | if (setgid(getegid()) < 0) |
| 122 | debug("setgid %u: %.100s", (u_int) getegid(), strerror(errno)); |
| 123 | /* Propagate the privileged uid to all of our uids. */ |
| 124 | if (setuid(geteuid()) < 0) |
| 125 | debug("setuid %u: %.100s", (u_int) geteuid(), strerror(errno)); |
| 126 | #endif /* SAVED_IDS_WORK_WITH_SETEUID */ |
Ben Lindstrom | f52373f | 2001-04-08 18:38:04 +0000 | [diff] [blame] | 127 | if (setegid(pw->pw_gid) < 0) |
Ben Lindstrom | abff1dd | 2002-06-06 20:38:49 +0000 | [diff] [blame] | 128 | fatal("setegid %u: %.100s", (u_int)pw->pw_gid, |
Ben Lindstrom | 768f975 | 2001-04-25 06:27:11 +0000 | [diff] [blame] | 129 | strerror(errno)); |
| 130 | if (seteuid(pw->pw_uid) == -1) |
Ben Lindstrom | abff1dd | 2002-06-06 20:38:49 +0000 | [diff] [blame] | 131 | fatal("seteuid %u: %.100s", (u_int)pw->pw_uid, |
Ben Lindstrom | 768f975 | 2001-04-25 06:27:11 +0000 | [diff] [blame] | 132 | strerror(errno)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 133 | } |
Ben Lindstrom | 768f975 | 2001-04-25 06:27:11 +0000 | [diff] [blame] | 134 | |
Damien Miller | 2e5fe88 | 2006-06-13 13:10:00 +1000 | [diff] [blame] | 135 | void |
| 136 | permanently_drop_suid(uid_t uid) |
| 137 | { |
| 138 | uid_t old_uid = getuid(); |
| 139 | |
| 140 | debug("permanently_drop_suid: %u", (u_int)uid); |
| 141 | #if defined(HAVE_SETRESUID) && !defined(BROKEN_SETRESUID) |
| 142 | if (setresuid(uid, uid, uid) < 0) |
| 143 | fatal("setresuid %u: %.100s", (u_int)uid, strerror(errno)); |
| 144 | #elif defined(HAVE_SETREUID) && !defined(BROKEN_SETREUID) |
| 145 | if (setreuid(uid, uid) < 0) |
| 146 | fatal("setreuid %u: %.100s", (u_int)uid, strerror(errno)); |
| 147 | #else |
| 148 | # ifndef SETEUID_BREAKS_SETUID |
| 149 | if (seteuid(uid) < 0) |
| 150 | fatal("seteuid %u: %.100s", (u_int)uid, strerror(errno)); |
| 151 | # endif |
| 152 | if (setuid(uid) < 0) |
| 153 | fatal("setuid %u: %.100s", (u_int)uid, strerror(errno)); |
| 154 | #endif |
| 155 | |
| 156 | #ifndef HAVE_CYGWIN |
| 157 | /* Try restoration of UID if changed (test clearing of saved uid) */ |
| 158 | if (old_uid != uid && |
| 159 | (setuid(old_uid) != -1 || seteuid(old_uid) != -1)) |
| 160 | fatal("%s: was able to restore old [e]uid", __func__); |
| 161 | #endif |
| 162 | |
| 163 | /* Verify UID drop was successful */ |
| 164 | if (getuid() != uid || geteuid() != uid) { |
| 165 | fatal("%s: euid incorrect uid:%u euid:%u (should be %u)", |
| 166 | __func__, (u_int)getuid(), (u_int)geteuid(), (u_int)uid); |
| 167 | } |
| 168 | } |
| 169 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 170 | /* |
Ben Lindstrom | ee2786a | 2001-04-22 17:08:00 +0000 | [diff] [blame] | 171 | * Restores to the original (privileged) uid. |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 172 | */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 173 | void |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 174 | restore_uid(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 175 | { |
Ben Lindstrom | 3fcf1a2 | 2001-04-08 18:26:59 +0000 | [diff] [blame] | 176 | /* it's a no-op unless privileged */ |
Ben Lindstrom | 1fa330c | 2002-07-23 21:29:49 +0000 | [diff] [blame] | 177 | if (!privileged) { |
| 178 | debug("restore_uid: (unprivileged)"); |
Ben Lindstrom | 3fcf1a2 | 2001-04-08 18:26:59 +0000 | [diff] [blame] | 179 | return; |
Ben Lindstrom | 1fa330c | 2002-07-23 21:29:49 +0000 | [diff] [blame] | 180 | } |
Ben Lindstrom | 3fcf1a2 | 2001-04-08 18:26:59 +0000 | [diff] [blame] | 181 | if (!temporarily_use_uid_effective) |
| 182 | fatal("restore_uid: temporarily_use_uid not effective"); |
Ben Lindstrom | 4468b26 | 2001-04-26 23:03:37 +0000 | [diff] [blame] | 183 | |
| 184 | #ifdef SAVED_IDS_WORK_WITH_SETEUID |
Ben Lindstrom | 18d2b5d | 2002-07-30 19:32:07 +0000 | [diff] [blame] | 185 | debug("restore_uid: %u/%u", (u_int)saved_euid, (u_int)saved_egid); |
Ben Lindstrom | ee2786a | 2001-04-22 17:08:00 +0000 | [diff] [blame] | 186 | /* Set the effective uid back to the saved privileged uid. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 187 | if (seteuid(saved_euid) < 0) |
Ben Lindstrom | abff1dd | 2002-06-06 20:38:49 +0000 | [diff] [blame] | 188 | fatal("seteuid %u: %.100s", (u_int)saved_euid, strerror(errno)); |
Ben Lindstrom | 4468b26 | 2001-04-26 23:03:37 +0000 | [diff] [blame] | 189 | if (setegid(saved_egid) < 0) |
Ben Lindstrom | abff1dd | 2002-06-06 20:38:49 +0000 | [diff] [blame] | 190 | fatal("setegid %u: %.100s", (u_int)saved_egid, strerror(errno)); |
Ben Lindstrom | 4468b26 | 2001-04-26 23:03:37 +0000 | [diff] [blame] | 191 | #else /* SAVED_IDS_WORK_WITH_SETEUID */ |
| 192 | /* |
| 193 | * We are unable to restore the real uid to its unprivileged value. |
| 194 | * Propagate the real uid (usually more privileged) to effective uid |
| 195 | * as well. |
| 196 | */ |
| 197 | setuid(getuid()); |
| 198 | setgid(getgid()); |
| 199 | #endif /* SAVED_IDS_WORK_WITH_SETEUID */ |
| 200 | |
Ben Lindstrom | f52373f | 2001-04-08 18:38:04 +0000 | [diff] [blame] | 201 | if (setgroups(saved_egroupslen, saved_egroups) < 0) |
Ben Lindstrom | 3fcf1a2 | 2001-04-08 18:26:59 +0000 | [diff] [blame] | 202 | fatal("setgroups: %.100s", strerror(errno)); |
Ben Lindstrom | 3fcf1a2 | 2001-04-08 18:26:59 +0000 | [diff] [blame] | 203 | temporarily_use_uid_effective = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 204 | } |
| 205 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 206 | /* |
| 207 | * Permanently sets all uids to the given uid. This cannot be |
| 208 | * called while temporarily_use_uid is effective. |
| 209 | */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 210 | void |
Ben Lindstrom | 3fcf1a2 | 2001-04-08 18:26:59 +0000 | [diff] [blame] | 211 | permanently_set_uid(struct passwd *pw) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 212 | { |
Damien Miller | 5fe46a4 | 2003-06-05 09:53:31 +1000 | [diff] [blame] | 213 | uid_t old_uid = getuid(); |
| 214 | gid_t old_gid = getgid(); |
| 215 | |
Damien Miller | 6b4069a | 2006-06-13 13:05:15 +1000 | [diff] [blame] | 216 | if (pw == NULL) |
| 217 | fatal("permanently_set_uid: no user given"); |
Ben Lindstrom | 3fcf1a2 | 2001-04-08 18:26:59 +0000 | [diff] [blame] | 218 | if (temporarily_use_uid_effective) |
Ben Lindstrom | ca8943e | 2002-06-06 20:42:04 +0000 | [diff] [blame] | 219 | fatal("permanently_set_uid: temporarily_use_uid effective"); |
Ben Lindstrom | 1fa330c | 2002-07-23 21:29:49 +0000 | [diff] [blame] | 220 | debug("permanently_set_uid: %u/%u", (u_int)pw->pw_uid, |
| 221 | (u_int)pw->pw_gid); |
Damien Miller | 5fe46a4 | 2003-06-05 09:53:31 +1000 | [diff] [blame] | 222 | |
Darren Tucker | e937be3 | 2003-12-17 18:53:26 +1100 | [diff] [blame] | 223 | #if defined(HAVE_SETRESGID) && !defined(BROKEN_SETRESGID) |
Damien Miller | 5fe46a4 | 2003-06-05 09:53:31 +1000 | [diff] [blame] | 224 | if (setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) < 0) |
| 225 | fatal("setresgid %u: %.100s", (u_int)pw->pw_gid, strerror(errno)); |
Darren Tucker | 9f18be6 | 2003-09-06 16:44:39 +1000 | [diff] [blame] | 226 | #elif defined(HAVE_SETREGID) && !defined(BROKEN_SETREGID) |
Damien Miller | 5fe46a4 | 2003-06-05 09:53:31 +1000 | [diff] [blame] | 227 | if (setregid(pw->pw_gid, pw->pw_gid) < 0) |
| 228 | fatal("setregid %u: %.100s", (u_int)pw->pw_gid, strerror(errno)); |
| 229 | #else |
Damien Miller | 61d3680 | 2003-06-02 19:09:48 +1000 | [diff] [blame] | 230 | if (setegid(pw->pw_gid) < 0) |
| 231 | fatal("setegid %u: %.100s", (u_int)pw->pw_gid, strerror(errno)); |
Ben Lindstrom | 3fcf1a2 | 2001-04-08 18:26:59 +0000 | [diff] [blame] | 232 | if (setgid(pw->pw_gid) < 0) |
Ben Lindstrom | abff1dd | 2002-06-06 20:38:49 +0000 | [diff] [blame] | 233 | fatal("setgid %u: %.100s", (u_int)pw->pw_gid, strerror(errno)); |
Damien Miller | 5fe46a4 | 2003-06-05 09:53:31 +1000 | [diff] [blame] | 234 | #endif |
| 235 | |
Damien Miller | 1598d6b | 2009-01-21 16:04:24 +1100 | [diff] [blame] | 236 | #ifdef __APPLE__ |
| 237 | /* |
| 238 | * OS X requires initgroups after setgid to opt back into |
| 239 | * memberd support for >16 supplemental groups. |
| 240 | */ |
| 241 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) |
| 242 | fatal("initgroups %.100s %u: %.100s", |
| 243 | pw->pw_name, (u_int)pw->pw_gid, strerror(errno)); |
| 244 | #endif |
| 245 | |
Darren Tucker | e937be3 | 2003-12-17 18:53:26 +1100 | [diff] [blame] | 246 | #if defined(HAVE_SETRESUID) && !defined(BROKEN_SETRESUID) |
Damien Miller | 5fe46a4 | 2003-06-05 09:53:31 +1000 | [diff] [blame] | 247 | if (setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid) < 0) |
| 248 | fatal("setresuid %u: %.100s", (u_int)pw->pw_uid, strerror(errno)); |
Darren Tucker | 9f18be6 | 2003-09-06 16:44:39 +1000 | [diff] [blame] | 249 | #elif defined(HAVE_SETREUID) && !defined(BROKEN_SETREUID) |
Darren Tucker | 400b878 | 2003-06-06 10:46:04 +1000 | [diff] [blame] | 250 | if (setreuid(pw->pw_uid, pw->pw_uid) < 0) |
| 251 | fatal("setreuid %u: %.100s", (u_int)pw->pw_uid, strerror(errno)); |
Damien Miller | 5fe46a4 | 2003-06-05 09:53:31 +1000 | [diff] [blame] | 252 | #else |
| 253 | # ifndef SETEUID_BREAKS_SETUID |
Damien Miller | 61d3680 | 2003-06-02 19:09:48 +1000 | [diff] [blame] | 254 | if (seteuid(pw->pw_uid) < 0) |
| 255 | fatal("seteuid %u: %.100s", (u_int)pw->pw_uid, strerror(errno)); |
Damien Miller | 5fe46a4 | 2003-06-05 09:53:31 +1000 | [diff] [blame] | 256 | # endif |
Ben Lindstrom | ee2786a | 2001-04-22 17:08:00 +0000 | [diff] [blame] | 257 | if (setuid(pw->pw_uid) < 0) |
Ben Lindstrom | abff1dd | 2002-06-06 20:38:49 +0000 | [diff] [blame] | 258 | fatal("setuid %u: %.100s", (u_int)pw->pw_uid, strerror(errno)); |
Damien Miller | 5fe46a4 | 2003-06-05 09:53:31 +1000 | [diff] [blame] | 259 | #endif |
| 260 | |
Darren Tucker | 35beadd | 2004-10-19 16:33:33 +1000 | [diff] [blame] | 261 | #ifndef HAVE_CYGWIN |
Damien Miller | 5fe46a4 | 2003-06-05 09:53:31 +1000 | [diff] [blame] | 262 | /* Try restoration of GID if changed (test clearing of saved gid) */ |
Darren Tucker | 35beadd | 2004-10-19 16:33:33 +1000 | [diff] [blame] | 263 | if (old_gid != pw->pw_gid && pw->pw_uid != 0 && |
Damien Miller | 5fe46a4 | 2003-06-05 09:53:31 +1000 | [diff] [blame] | 264 | (setgid(old_gid) != -1 || setegid(old_gid) != -1)) |
Darren Tucker | 400b878 | 2003-06-06 10:46:04 +1000 | [diff] [blame] | 265 | fatal("%s: was able to restore old [e]gid", __func__); |
Darren Tucker | 35beadd | 2004-10-19 16:33:33 +1000 | [diff] [blame] | 266 | #endif |
Damien Miller | 5fe46a4 | 2003-06-05 09:53:31 +1000 | [diff] [blame] | 267 | |
| 268 | /* Verify GID drop was successful */ |
| 269 | if (getgid() != pw->pw_gid || getegid() != pw->pw_gid) { |
Damien Miller | a8e06ce | 2003-11-21 23:48:55 +1100 | [diff] [blame] | 270 | fatal("%s: egid incorrect gid:%u egid:%u (should be %u)", |
| 271 | __func__, (u_int)getgid(), (u_int)getegid(), |
Damien Miller | 5fe46a4 | 2003-06-05 09:53:31 +1000 | [diff] [blame] | 272 | (u_int)pw->pw_gid); |
| 273 | } |
| 274 | |
Darren Tucker | fbe3b36 | 2003-09-22 12:54:37 +1000 | [diff] [blame] | 275 | #ifndef HAVE_CYGWIN |
Damien Miller | 5fe46a4 | 2003-06-05 09:53:31 +1000 | [diff] [blame] | 276 | /* Try restoration of UID if changed (test clearing of saved uid) */ |
Damien Miller | a8e06ce | 2003-11-21 23:48:55 +1100 | [diff] [blame] | 277 | if (old_uid != pw->pw_uid && |
Damien Miller | 5fe46a4 | 2003-06-05 09:53:31 +1000 | [diff] [blame] | 278 | (setuid(old_uid) != -1 || seteuid(old_uid) != -1)) |
Darren Tucker | 400b878 | 2003-06-06 10:46:04 +1000 | [diff] [blame] | 279 | fatal("%s: was able to restore old [e]uid", __func__); |
Darren Tucker | fbe3b36 | 2003-09-22 12:54:37 +1000 | [diff] [blame] | 280 | #endif |
Damien Miller | 5fe46a4 | 2003-06-05 09:53:31 +1000 | [diff] [blame] | 281 | |
| 282 | /* Verify UID drop was successful */ |
| 283 | if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) { |
Damien Miller | a8e06ce | 2003-11-21 23:48:55 +1100 | [diff] [blame] | 284 | fatal("%s: euid incorrect uid:%u euid:%u (should be %u)", |
| 285 | __func__, (u_int)getuid(), (u_int)geteuid(), |
Damien Miller | 5fe46a4 | 2003-06-05 09:53:31 +1000 | [diff] [blame] | 286 | (u_int)pw->pw_uid); |
| 287 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 288 | } |