Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 1 | /*- |
| 2 | * Copyright (c) 2002 Networks Associates Technology, Inc. |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * This software was developed for the FreeBSD Project by ThinkSec AS and |
| 6 | * NAI Labs, the Security Research Division of Network Associates, Inc. |
| 7 | * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the |
| 8 | * DARPA CHATS research program. |
Damien Miller | e69f18c | 2000-06-12 16:38:54 +1000 | [diff] [blame] | 9 | * |
| 10 | * Redistribution and use in source and binary forms, with or without |
| 11 | * modification, are permitted provided that the following conditions |
| 12 | * are met: |
| 13 | * 1. Redistributions of source code must retain the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer. |
| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer in the |
| 17 | * documentation and/or other materials provided with the distribution. |
Damien Miller | e69f18c | 2000-06-12 16:38:54 +1000 | [diff] [blame] | 18 | * |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 19 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| 20 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 23 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 25 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 26 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 27 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 28 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 29 | * SUCH DAMAGE. |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 30 | */ |
| 31 | |
Damien Miller | 25d9342 | 2003-05-18 20:45:47 +1000 | [diff] [blame] | 32 | /* Based on $FreeBSD: src/crypto/openssh/auth2-pam-freebsd.c,v 1.11 2003/03/31 13:48:18 des Exp $ */ |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 33 | #include "includes.h" |
Darren Tucker | b9b6021 | 2004-03-04 20:03:54 +1100 | [diff] [blame^] | 34 | RCSID("$Id: auth-pam.c,v 1.97 2004/03/04 09:03:54 dtucker Exp $"); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 35 | |
| 36 | #ifdef USE_PAM |
Damien Miller | 0f47c53 | 2004-01-02 18:01:30 +1100 | [diff] [blame] | 37 | #if defined(HAVE_SECURITY_PAM_APPL_H) |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 38 | #include <security/pam_appl.h> |
Damien Miller | 0f47c53 | 2004-01-02 18:01:30 +1100 | [diff] [blame] | 39 | #elif defined (HAVE_PAM_PAM_APPL_H) |
| 40 | #include <pam/pam_appl.h> |
| 41 | #endif |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 42 | |
Kevin Steves | e683e76 | 2002-04-04 19:02:28 +0000 | [diff] [blame] | 43 | #include "auth.h" |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 44 | #include "auth-pam.h" |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 45 | #include "buffer.h" |
| 46 | #include "bufaux.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 47 | #include "canohost.h" |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 48 | #include "log.h" |
| 49 | #include "monitor_wrap.h" |
| 50 | #include "msg.h" |
| 51 | #include "packet.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 52 | #include "readpass.h" |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 53 | #include "servconf.h" |
| 54 | #include "ssh2.h" |
| 55 | #include "xmalloc.h" |
Damien Miller | 1f499fd | 2003-08-25 13:08:49 +1000 | [diff] [blame] | 56 | #include "auth-options.h" |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 57 | |
Damien Miller | 4e448a3 | 2003-05-14 15:11:48 +1000 | [diff] [blame] | 58 | extern ServerOptions options; |
Darren Tucker | 18df00c | 2003-11-18 12:42:07 +1100 | [diff] [blame] | 59 | extern Buffer loginmsg; |
Darren Tucker | 07705c7 | 2003-12-18 15:34:31 +1100 | [diff] [blame] | 60 | extern int compat20; |
Damien Miller | 4e448a3 | 2003-05-14 15:11:48 +1000 | [diff] [blame] | 61 | |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 62 | #ifdef USE_POSIX_THREADS |
| 63 | #include <pthread.h> |
| 64 | /* |
Damien Miller | a8e06ce | 2003-11-21 23:48:55 +1100 | [diff] [blame] | 65 | * Avoid namespace clash when *not* using pthreads for systems *with* |
| 66 | * pthreads, which unconditionally define pthread_t via sys/types.h |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 67 | * (e.g. Linux) |
| 68 | */ |
Damien Miller | a8e06ce | 2003-11-21 23:48:55 +1100 | [diff] [blame] | 69 | typedef pthread_t sp_pthread_t; |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 70 | #else |
Darren Tucker | 1b27c8f | 2004-01-13 22:35:58 +1100 | [diff] [blame] | 71 | typedef pid_t sp_pthread_t; |
| 72 | #endif |
| 73 | |
| 74 | struct pam_ctxt { |
| 75 | sp_pthread_t pam_thread; |
| 76 | int pam_psock; |
| 77 | int pam_csock; |
| 78 | int pam_done; |
| 79 | }; |
| 80 | |
| 81 | static void sshpam_free_ctx(void *); |
| 82 | static struct pam_ctxt *cleanup_ctxt; |
| 83 | |
| 84 | #ifndef USE_POSIX_THREADS |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 85 | /* |
| 86 | * Simulate threads with processes. |
| 87 | */ |
Kevin Steves | 63007d4 | 2002-07-21 17:57:01 +0000 | [diff] [blame] | 88 | |
Darren Tucker | 749bc95 | 2004-01-14 22:14:04 +1100 | [diff] [blame] | 89 | static int sshpam_thread_status = -1; |
| 90 | static mysig_t sshpam_oldsig; |
| 91 | |
| 92 | static void |
| 93 | sshpam_sigchld_handler(int sig) |
| 94 | { |
Darren Tucker | 7ae0962 | 2004-01-14 23:07:56 +1100 | [diff] [blame] | 95 | if (cleanup_ctxt == NULL) |
| 96 | return; /* handler called after PAM cleanup, shouldn't happen */ |
Darren Tucker | 749bc95 | 2004-01-14 22:14:04 +1100 | [diff] [blame] | 97 | if (waitpid(cleanup_ctxt->pam_thread, &sshpam_thread_status, 0) == -1) |
| 98 | return; /* couldn't wait for process */ |
| 99 | if (WIFSIGNALED(sshpam_thread_status) && |
| 100 | WTERMSIG(sshpam_thread_status) == SIGTERM) |
| 101 | return; /* terminated by pthread_cancel */ |
| 102 | if (!WIFEXITED(sshpam_thread_status)) |
| 103 | fatal("PAM: authentication thread exited unexpectedly"); |
| 104 | if (WEXITSTATUS(sshpam_thread_status) != 0) |
| 105 | fatal("PAM: authentication thread exited uncleanly"); |
| 106 | } |
| 107 | |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 108 | static void |
| 109 | pthread_exit(void *value __unused) |
| 110 | { |
| 111 | _exit(0); |
| 112 | } |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 113 | |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 114 | static int |
| 115 | pthread_create(sp_pthread_t *thread, const void *attr __unused, |
| 116 | void *(*thread_start)(void *), void *arg) |
| 117 | { |
| 118 | pid_t pid; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 119 | |
Darren Tucker | b9b6021 | 2004-03-04 20:03:54 +1100 | [diff] [blame^] | 120 | sshpam_thread_status = -1; |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 121 | switch ((pid = fork())) { |
| 122 | case -1: |
| 123 | error("fork(): %s", strerror(errno)); |
| 124 | return (-1); |
| 125 | case 0: |
| 126 | thread_start(arg); |
| 127 | _exit(1); |
| 128 | default: |
| 129 | *thread = pid; |
Darren Tucker | 749bc95 | 2004-01-14 22:14:04 +1100 | [diff] [blame] | 130 | sshpam_oldsig = signal(SIGCHLD, sshpam_sigchld_handler); |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 131 | return (0); |
| 132 | } |
| 133 | } |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 134 | |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 135 | static int |
| 136 | pthread_cancel(sp_pthread_t thread) |
| 137 | { |
Darren Tucker | 7ae0962 | 2004-01-14 23:07:56 +1100 | [diff] [blame] | 138 | signal(SIGCHLD, sshpam_oldsig); |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 139 | return (kill(thread, SIGTERM)); |
| 140 | } |
| 141 | |
| 142 | static int |
| 143 | pthread_join(sp_pthread_t thread, void **value __unused) |
| 144 | { |
| 145 | int status; |
| 146 | |
Darren Tucker | 749bc95 | 2004-01-14 22:14:04 +1100 | [diff] [blame] | 147 | if (sshpam_thread_status != -1) |
| 148 | return (sshpam_thread_status); |
| 149 | signal(SIGCHLD, sshpam_oldsig); |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 150 | waitpid(thread, &status, 0); |
| 151 | return (status); |
| 152 | } |
| 153 | #endif |
| 154 | |
| 155 | |
Damien Miller | 5c3a558 | 2003-09-23 22:12:38 +1000 | [diff] [blame] | 156 | static pam_handle_t *sshpam_handle = NULL; |
| 157 | static int sshpam_err = 0; |
| 158 | static int sshpam_authenticated = 0; |
Damien Miller | 5c3a558 | 2003-09-23 22:12:38 +1000 | [diff] [blame] | 159 | static int sshpam_session_open = 0; |
| 160 | static int sshpam_cred_established = 0; |
Darren Tucker | 07705c7 | 2003-12-18 15:34:31 +1100 | [diff] [blame] | 161 | static int sshpam_account_status = -1; |
Damien Miller | c756e9b | 2003-11-17 21:41:42 +1100 | [diff] [blame] | 162 | static char **sshpam_env = NULL; |
Darren Tucker | 1921ed9 | 2004-02-10 13:23:28 +1100 | [diff] [blame] | 163 | static int *force_pwchange; |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 164 | |
Damien Miller | c756e9b | 2003-11-17 21:41:42 +1100 | [diff] [blame] | 165 | /* Some PAM implementations don't implement this */ |
| 166 | #ifndef HAVE_PAM_GETENVLIST |
| 167 | static char ** |
| 168 | pam_getenvlist(pam_handle_t *pamh) |
| 169 | { |
| 170 | /* |
Damien Miller | a8e06ce | 2003-11-21 23:48:55 +1100 | [diff] [blame] | 171 | * XXX - If necessary, we can still support envrionment passing |
Damien Miller | c756e9b | 2003-11-17 21:41:42 +1100 | [diff] [blame] | 172 | * for platforms without pam_getenvlist by searching for known |
| 173 | * env vars (e.g. KRB5CCNAME) from the PAM environment. |
| 174 | */ |
| 175 | return NULL; |
| 176 | } |
| 177 | #endif |
| 178 | |
Darren Tucker | 07705c7 | 2003-12-18 15:34:31 +1100 | [diff] [blame] | 179 | void |
| 180 | pam_password_change_required(int reqd) |
| 181 | { |
Darren Tucker | a8df924 | 2004-01-15 00:15:07 +1100 | [diff] [blame] | 182 | debug3("%s %d", __func__, reqd); |
Darren Tucker | 1921ed9 | 2004-02-10 13:23:28 +1100 | [diff] [blame] | 183 | *force_pwchange = reqd; |
Darren Tucker | 07705c7 | 2003-12-18 15:34:31 +1100 | [diff] [blame] | 184 | if (reqd) { |
| 185 | no_port_forwarding_flag |= 2; |
| 186 | no_agent_forwarding_flag |= 2; |
| 187 | no_x11_forwarding_flag |= 2; |
| 188 | } else { |
| 189 | no_port_forwarding_flag &= ~2; |
| 190 | no_agent_forwarding_flag &= ~2; |
| 191 | no_x11_forwarding_flag &= ~2; |
Darren Tucker | 07705c7 | 2003-12-18 15:34:31 +1100 | [diff] [blame] | 192 | } |
| 193 | } |
Darren Tucker | 1921ed9 | 2004-02-10 13:23:28 +1100 | [diff] [blame] | 194 | |
Damien Miller | c756e9b | 2003-11-17 21:41:42 +1100 | [diff] [blame] | 195 | /* Import regular and PAM environment from subprocess */ |
| 196 | static void |
| 197 | import_environments(Buffer *b) |
| 198 | { |
| 199 | char *env; |
| 200 | u_int i, num_env; |
| 201 | int err; |
| 202 | |
Darren Tucker | a8df924 | 2004-01-15 00:15:07 +1100 | [diff] [blame] | 203 | debug3("PAM: %s entering", __func__); |
| 204 | |
Darren Tucker | 4b385d4 | 2004-03-04 19:54:10 +1100 | [diff] [blame] | 205 | #ifndef USE_POSIX_THREADS |
Darren Tucker | 07705c7 | 2003-12-18 15:34:31 +1100 | [diff] [blame] | 206 | /* Import variables set by do_pam_account */ |
| 207 | sshpam_account_status = buffer_get_int(b); |
| 208 | pam_password_change_required(buffer_get_int(b)); |
| 209 | |
Damien Miller | c756e9b | 2003-11-17 21:41:42 +1100 | [diff] [blame] | 210 | /* Import environment from subprocess */ |
| 211 | num_env = buffer_get_int(b); |
| 212 | sshpam_env = xmalloc((num_env + 1) * sizeof(*sshpam_env)); |
| 213 | debug3("PAM: num env strings %d", num_env); |
| 214 | for(i = 0; i < num_env; i++) |
| 215 | sshpam_env[i] = buffer_get_string(b, NULL); |
| 216 | |
| 217 | sshpam_env[num_env] = NULL; |
| 218 | |
| 219 | /* Import PAM environment from subprocess */ |
| 220 | num_env = buffer_get_int(b); |
| 221 | debug("PAM: num PAM env strings %d", num_env); |
| 222 | for(i = 0; i < num_env; i++) { |
| 223 | env = buffer_get_string(b, NULL); |
| 224 | |
Darren Tucker | 8a1624c | 2003-11-18 12:45:35 +1100 | [diff] [blame] | 225 | #ifdef HAVE_PAM_PUTENV |
Damien Miller | c756e9b | 2003-11-17 21:41:42 +1100 | [diff] [blame] | 226 | /* Errors are not fatal here */ |
| 227 | if ((err = pam_putenv(sshpam_handle, env)) != PAM_SUCCESS) { |
| 228 | error("PAM: pam_putenv: %s", |
| 229 | pam_strerror(sshpam_handle, sshpam_err)); |
| 230 | } |
Darren Tucker | 8a1624c | 2003-11-18 12:45:35 +1100 | [diff] [blame] | 231 | #endif |
Damien Miller | c756e9b | 2003-11-17 21:41:42 +1100 | [diff] [blame] | 232 | } |
Darren Tucker | 4b385d4 | 2004-03-04 19:54:10 +1100 | [diff] [blame] | 233 | #endif |
Damien Miller | c756e9b | 2003-11-17 21:41:42 +1100 | [diff] [blame] | 234 | } |
| 235 | |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 236 | /* |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 237 | * Conversation function for authentication thread. |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 238 | */ |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 239 | static int |
Damien Miller | 1f499fd | 2003-08-25 13:08:49 +1000 | [diff] [blame] | 240 | sshpam_thread_conv(int n, const struct pam_message **msg, |
| 241 | struct pam_response **resp, void *data) |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 242 | { |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 243 | Buffer buffer; |
| 244 | struct pam_ctxt *ctxt; |
Damien Miller | 5c3a558 | 2003-09-23 22:12:38 +1000 | [diff] [blame] | 245 | struct pam_response *reply; |
Kevin Steves | 38b050a | 2002-07-23 00:44:07 +0000 | [diff] [blame] | 246 | int i; |
| 247 | |
Darren Tucker | ba53b83 | 2004-02-17 20:46:59 +1100 | [diff] [blame] | 248 | debug3("PAM: %s entering, %d messages", __func__, n); |
Damien Miller | 5c3a558 | 2003-09-23 22:12:38 +1000 | [diff] [blame] | 249 | *resp = NULL; |
| 250 | |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 251 | ctxt = data; |
| 252 | if (n <= 0 || n > PAM_MAX_NUM_MSG) |
| 253 | return (PAM_CONV_ERR); |
Damien Miller | 5c3a558 | 2003-09-23 22:12:38 +1000 | [diff] [blame] | 254 | |
| 255 | if ((reply = malloc(n * sizeof(*reply))) == NULL) |
| 256 | return (PAM_CONV_ERR); |
| 257 | memset(reply, 0, n * sizeof(*reply)); |
| 258 | |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 259 | buffer_init(&buffer); |
| 260 | for (i = 0; i < n; ++i) { |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 261 | switch (PAM_MSG_MEMBER(msg, i, msg_style)) { |
| 262 | case PAM_PROMPT_ECHO_OFF: |
Damien Miller | a8e06ce | 2003-11-21 23:48:55 +1100 | [diff] [blame] | 263 | buffer_put_cstring(&buffer, |
Damien Miller | 5c3a558 | 2003-09-23 22:12:38 +1000 | [diff] [blame] | 264 | PAM_MSG_MEMBER(msg, i, msg)); |
Damien Miller | a8e06ce | 2003-11-21 23:48:55 +1100 | [diff] [blame] | 265 | if (ssh_msg_send(ctxt->pam_csock, |
Damien Miller | 9bdba70 | 2003-11-17 21:27:55 +1100 | [diff] [blame] | 266 | PAM_MSG_MEMBER(msg, i, msg_style), &buffer) == -1) |
| 267 | goto fail; |
Damien Miller | a8e06ce | 2003-11-21 23:48:55 +1100 | [diff] [blame] | 268 | if (ssh_msg_recv(ctxt->pam_csock, &buffer) == -1) |
Damien Miller | 9bdba70 | 2003-11-17 21:27:55 +1100 | [diff] [blame] | 269 | goto fail; |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 270 | if (buffer_get_char(&buffer) != PAM_AUTHTOK) |
| 271 | goto fail; |
Damien Miller | 5c3a558 | 2003-09-23 22:12:38 +1000 | [diff] [blame] | 272 | reply[i].resp = buffer_get_string(&buffer, NULL); |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 273 | break; |
| 274 | case PAM_PROMPT_ECHO_ON: |
Damien Miller | a8e06ce | 2003-11-21 23:48:55 +1100 | [diff] [blame] | 275 | buffer_put_cstring(&buffer, |
Damien Miller | 5c3a558 | 2003-09-23 22:12:38 +1000 | [diff] [blame] | 276 | PAM_MSG_MEMBER(msg, i, msg)); |
Damien Miller | a8e06ce | 2003-11-21 23:48:55 +1100 | [diff] [blame] | 277 | if (ssh_msg_send(ctxt->pam_csock, |
Damien Miller | 9bdba70 | 2003-11-17 21:27:55 +1100 | [diff] [blame] | 278 | PAM_MSG_MEMBER(msg, i, msg_style), &buffer) == -1) |
| 279 | goto fail; |
| 280 | if (ssh_msg_recv(ctxt->pam_csock, &buffer) == -1) |
| 281 | goto fail; |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 282 | if (buffer_get_char(&buffer) != PAM_AUTHTOK) |
| 283 | goto fail; |
Damien Miller | 5c3a558 | 2003-09-23 22:12:38 +1000 | [diff] [blame] | 284 | reply[i].resp = buffer_get_string(&buffer, NULL); |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 285 | break; |
| 286 | case PAM_ERROR_MSG: |
Damien Miller | a8e06ce | 2003-11-21 23:48:55 +1100 | [diff] [blame] | 287 | buffer_put_cstring(&buffer, |
Damien Miller | 5c3a558 | 2003-09-23 22:12:38 +1000 | [diff] [blame] | 288 | PAM_MSG_MEMBER(msg, i, msg)); |
Damien Miller | a8e06ce | 2003-11-21 23:48:55 +1100 | [diff] [blame] | 289 | if (ssh_msg_send(ctxt->pam_csock, |
Damien Miller | 9bdba70 | 2003-11-17 21:27:55 +1100 | [diff] [blame] | 290 | PAM_MSG_MEMBER(msg, i, msg_style), &buffer) == -1) |
| 291 | goto fail; |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 292 | break; |
| 293 | case PAM_TEXT_INFO: |
Damien Miller | a8e06ce | 2003-11-21 23:48:55 +1100 | [diff] [blame] | 294 | buffer_put_cstring(&buffer, |
Damien Miller | 5c3a558 | 2003-09-23 22:12:38 +1000 | [diff] [blame] | 295 | PAM_MSG_MEMBER(msg, i, msg)); |
Damien Miller | a8e06ce | 2003-11-21 23:48:55 +1100 | [diff] [blame] | 296 | if (ssh_msg_send(ctxt->pam_csock, |
Damien Miller | 9bdba70 | 2003-11-17 21:27:55 +1100 | [diff] [blame] | 297 | PAM_MSG_MEMBER(msg, i, msg_style), &buffer) == -1) |
| 298 | goto fail; |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 299 | break; |
| 300 | default: |
| 301 | goto fail; |
| 302 | } |
| 303 | buffer_clear(&buffer); |
Kevin Steves | 38b050a | 2002-07-23 00:44:07 +0000 | [diff] [blame] | 304 | } |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 305 | buffer_free(&buffer); |
Damien Miller | 5c3a558 | 2003-09-23 22:12:38 +1000 | [diff] [blame] | 306 | *resp = reply; |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 307 | return (PAM_SUCCESS); |
Damien Miller | 5c3a558 | 2003-09-23 22:12:38 +1000 | [diff] [blame] | 308 | |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 309 | fail: |
Damien Miller | 5c3a558 | 2003-09-23 22:12:38 +1000 | [diff] [blame] | 310 | for(i = 0; i < n; i++) { |
| 311 | if (reply[i].resp != NULL) |
| 312 | xfree(reply[i].resp); |
| 313 | } |
| 314 | xfree(reply); |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 315 | buffer_free(&buffer); |
| 316 | return (PAM_CONV_ERR); |
Kevin Steves | 38b050a | 2002-07-23 00:44:07 +0000 | [diff] [blame] | 317 | } |
| 318 | |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 319 | /* |
| 320 | * Authentication thread. |
| 321 | */ |
| 322 | static void * |
| 323 | sshpam_thread(void *ctxtp) |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 324 | { |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 325 | struct pam_ctxt *ctxt = ctxtp; |
| 326 | Buffer buffer; |
Damien Miller | f4b6f10 | 2003-09-02 23:12:06 +1000 | [diff] [blame] | 327 | struct pam_conv sshpam_conv; |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 328 | #ifndef USE_POSIX_THREADS |
Damien Miller | c756e9b | 2003-11-17 21:41:42 +1100 | [diff] [blame] | 329 | extern char **environ; |
| 330 | char **env_from_pam; |
| 331 | u_int i; |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 332 | const char *pam_user; |
| 333 | |
| 334 | pam_get_item(sshpam_handle, PAM_USER, (const void **)&pam_user); |
| 335 | setproctitle("%s [pam]", pam_user); |
Damien Miller | c756e9b | 2003-11-17 21:41:42 +1100 | [diff] [blame] | 336 | environ[0] = NULL; |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 337 | #endif |
| 338 | |
Damien Miller | f4b6f10 | 2003-09-02 23:12:06 +1000 | [diff] [blame] | 339 | sshpam_conv.conv = sshpam_thread_conv; |
| 340 | sshpam_conv.appdata_ptr = ctxt; |
| 341 | |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 342 | buffer_init(&buffer); |
| 343 | sshpam_err = pam_set_item(sshpam_handle, PAM_CONV, |
| 344 | (const void *)&sshpam_conv); |
| 345 | if (sshpam_err != PAM_SUCCESS) |
| 346 | goto auth_fail; |
| 347 | sshpam_err = pam_authenticate(sshpam_handle, 0); |
| 348 | if (sshpam_err != PAM_SUCCESS) |
| 349 | goto auth_fail; |
Darren Tucker | 07705c7 | 2003-12-18 15:34:31 +1100 | [diff] [blame] | 350 | |
Darren Tucker | c376c86 | 2003-12-18 16:08:59 +1100 | [diff] [blame] | 351 | if (compat20) { |
Darren Tucker | 07705c7 | 2003-12-18 15:34:31 +1100 | [diff] [blame] | 352 | if (!do_pam_account()) |
| 353 | goto auth_fail; |
Darren Tucker | 1921ed9 | 2004-02-10 13:23:28 +1100 | [diff] [blame] | 354 | if (*force_pwchange) { |
Darren Tucker | 07705c7 | 2003-12-18 15:34:31 +1100 | [diff] [blame] | 355 | sshpam_err = pam_chauthtok(sshpam_handle, |
| 356 | PAM_CHANGE_EXPIRED_AUTHTOK); |
| 357 | if (sshpam_err != PAM_SUCCESS) |
| 358 | goto auth_fail; |
| 359 | pam_password_change_required(0); |
| 360 | } |
Darren Tucker | c376c86 | 2003-12-18 16:08:59 +1100 | [diff] [blame] | 361 | } |
Darren Tucker | 07705c7 | 2003-12-18 15:34:31 +1100 | [diff] [blame] | 362 | |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 363 | buffer_put_cstring(&buffer, "OK"); |
Damien Miller | c756e9b | 2003-11-17 21:41:42 +1100 | [diff] [blame] | 364 | |
| 365 | #ifndef USE_POSIX_THREADS |
Darren Tucker | 07705c7 | 2003-12-18 15:34:31 +1100 | [diff] [blame] | 366 | /* Export variables set by do_pam_account */ |
| 367 | buffer_put_int(&buffer, sshpam_account_status); |
Darren Tucker | 1921ed9 | 2004-02-10 13:23:28 +1100 | [diff] [blame] | 368 | buffer_put_int(&buffer, *force_pwchange); |
Darren Tucker | 07705c7 | 2003-12-18 15:34:31 +1100 | [diff] [blame] | 369 | |
Damien Miller | c756e9b | 2003-11-17 21:41:42 +1100 | [diff] [blame] | 370 | /* Export any environment strings set in child */ |
| 371 | for(i = 0; environ[i] != NULL; i++) |
| 372 | ; /* Count */ |
| 373 | buffer_put_int(&buffer, i); |
| 374 | for(i = 0; environ[i] != NULL; i++) |
| 375 | buffer_put_cstring(&buffer, environ[i]); |
| 376 | |
| 377 | /* Export any environment strings set by PAM in child */ |
| 378 | env_from_pam = pam_getenvlist(sshpam_handle); |
| 379 | for(i = 0; env_from_pam != NULL && env_from_pam[i] != NULL; i++) |
| 380 | ; /* Count */ |
| 381 | buffer_put_int(&buffer, i); |
| 382 | for(i = 0; env_from_pam != NULL && env_from_pam[i] != NULL; i++) |
| 383 | buffer_put_cstring(&buffer, env_from_pam[i]); |
| 384 | #endif /* USE_POSIX_THREADS */ |
| 385 | |
Damien Miller | 9bdba70 | 2003-11-17 21:27:55 +1100 | [diff] [blame] | 386 | /* XXX - can't do much about an error here */ |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 387 | ssh_msg_send(ctxt->pam_csock, sshpam_err, &buffer); |
| 388 | buffer_free(&buffer); |
| 389 | pthread_exit(NULL); |
| 390 | |
| 391 | auth_fail: |
| 392 | buffer_put_cstring(&buffer, |
| 393 | pam_strerror(sshpam_handle, sshpam_err)); |
Damien Miller | 9bdba70 | 2003-11-17 21:27:55 +1100 | [diff] [blame] | 394 | /* XXX - can't do much about an error here */ |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 395 | ssh_msg_send(ctxt->pam_csock, PAM_AUTH_ERR, &buffer); |
| 396 | buffer_free(&buffer); |
| 397 | pthread_exit(NULL); |
Damien Miller | 787b2ec | 2003-11-21 23:56:47 +1100 | [diff] [blame] | 398 | |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 399 | return (NULL); /* Avoid warning for non-pthread case */ |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 400 | } |
| 401 | |
Darren Tucker | 8846a07 | 2003-10-07 11:30:15 +1000 | [diff] [blame] | 402 | void |
| 403 | sshpam_thread_cleanup(void) |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 404 | { |
Darren Tucker | 8846a07 | 2003-10-07 11:30:15 +1000 | [diff] [blame] | 405 | struct pam_ctxt *ctxt = cleanup_ctxt; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 406 | |
Darren Tucker | a8df924 | 2004-01-15 00:15:07 +1100 | [diff] [blame] | 407 | debug3("PAM: %s entering", __func__); |
Darren Tucker | 8846a07 | 2003-10-07 11:30:15 +1000 | [diff] [blame] | 408 | if (ctxt != NULL && ctxt->pam_thread != 0) { |
| 409 | pthread_cancel(ctxt->pam_thread); |
| 410 | pthread_join(ctxt->pam_thread, NULL); |
| 411 | close(ctxt->pam_psock); |
| 412 | close(ctxt->pam_csock); |
| 413 | memset(ctxt, 0, sizeof(*ctxt)); |
| 414 | cleanup_ctxt = NULL; |
| 415 | } |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 416 | } |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 417 | |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 418 | static int |
Damien Miller | 1f499fd | 2003-08-25 13:08:49 +1000 | [diff] [blame] | 419 | sshpam_null_conv(int n, const struct pam_message **msg, |
| 420 | struct pam_response **resp, void *data) |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 421 | { |
Darren Tucker | ba53b83 | 2004-02-17 20:46:59 +1100 | [diff] [blame] | 422 | debug3("PAM: %s entering, %d messages", __func__, n); |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 423 | return (PAM_CONV_ERR); |
| 424 | } |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 425 | |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 426 | static struct pam_conv null_conv = { sshpam_null_conv, NULL }; |
| 427 | |
Darren Tucker | 8846a07 | 2003-10-07 11:30:15 +1000 | [diff] [blame] | 428 | void |
| 429 | sshpam_cleanup(void) |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 430 | { |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 431 | debug("PAM: cleanup"); |
Damien Miller | 5c3a558 | 2003-09-23 22:12:38 +1000 | [diff] [blame] | 432 | if (sshpam_handle == NULL) |
| 433 | return; |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 434 | pam_set_item(sshpam_handle, PAM_CONV, (const void *)&null_conv); |
| 435 | if (sshpam_cred_established) { |
| 436 | pam_setcred(sshpam_handle, PAM_DELETE_CRED); |
| 437 | sshpam_cred_established = 0; |
| 438 | } |
| 439 | if (sshpam_session_open) { |
| 440 | pam_close_session(sshpam_handle, PAM_SILENT); |
| 441 | sshpam_session_open = 0; |
| 442 | } |
Darren Tucker | 1921ed9 | 2004-02-10 13:23:28 +1100 | [diff] [blame] | 443 | sshpam_authenticated = 0; |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 444 | pam_end(sshpam_handle, sshpam_err); |
| 445 | sshpam_handle = NULL; |
| 446 | } |
| 447 | |
| 448 | static int |
| 449 | sshpam_init(const char *user) |
| 450 | { |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 451 | extern u_int utmp_len; |
Darren Tucker | 455813b | 2003-09-13 22:12:11 +1000 | [diff] [blame] | 452 | extern char *__progname; |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 453 | const char *pam_rhost, *pam_user; |
| 454 | |
| 455 | if (sshpam_handle != NULL) { |
| 456 | /* We already have a PAM context; check if the user matches */ |
| 457 | sshpam_err = pam_get_item(sshpam_handle, |
| 458 | PAM_USER, (const void **)&pam_user); |
| 459 | if (sshpam_err == PAM_SUCCESS && strcmp(user, pam_user) == 0) |
| 460 | return (0); |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 461 | pam_end(sshpam_handle, sshpam_err); |
| 462 | sshpam_handle = NULL; |
| 463 | } |
| 464 | debug("PAM: initializing for \"%s\"", user); |
Darren Tucker | c58c2ee | 2003-09-13 22:02:05 +1000 | [diff] [blame] | 465 | sshpam_err = |
| 466 | pam_start(SSHD_PAM_SERVICE, user, &null_conv, &sshpam_handle); |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 467 | if (sshpam_err != PAM_SUCCESS) { |
| 468 | pam_end(sshpam_handle, sshpam_err); |
| 469 | sshpam_handle = NULL; |
| 470 | return (-1); |
| 471 | } |
Damien Miller | 3a961dc | 2003-06-03 10:25:48 +1000 | [diff] [blame] | 472 | pam_rhost = get_remote_name_or_ip(utmp_len, options.use_dns); |
Damien Miller | 4633720 | 2003-06-02 11:04:39 +1000 | [diff] [blame] | 473 | debug("PAM: setting PAM_RHOST to \"%s\"", pam_rhost); |
Damien Miller | 25d9342 | 2003-05-18 20:45:47 +1000 | [diff] [blame] | 474 | sshpam_err = pam_set_item(sshpam_handle, PAM_RHOST, pam_rhost); |
| 475 | if (sshpam_err != PAM_SUCCESS) { |
Damien Miller | 1f499fd | 2003-08-25 13:08:49 +1000 | [diff] [blame] | 476 | pam_end(sshpam_handle, sshpam_err); |
Damien Miller | 25d9342 | 2003-05-18 20:45:47 +1000 | [diff] [blame] | 477 | sshpam_handle = NULL; |
| 478 | return (-1); |
| 479 | } |
| 480 | #ifdef PAM_TTY_KLUDGE |
Damien Miller | a8e06ce | 2003-11-21 23:48:55 +1100 | [diff] [blame] | 481 | /* |
| 482 | * Some silly PAM modules (e.g. pam_time) require a TTY to operate. |
| 483 | * sshd doesn't set the tty until too late in the auth process and |
Damien Miller | 25d9342 | 2003-05-18 20:45:47 +1000 | [diff] [blame] | 484 | * may not even set one (for tty-less connections) |
Damien Miller | a8e06ce | 2003-11-21 23:48:55 +1100 | [diff] [blame] | 485 | */ |
Damien Miller | 25d9342 | 2003-05-18 20:45:47 +1000 | [diff] [blame] | 486 | debug("PAM: setting PAM_TTY to \"ssh\""); |
| 487 | sshpam_err = pam_set_item(sshpam_handle, PAM_TTY, "ssh"); |
| 488 | if (sshpam_err != PAM_SUCCESS) { |
| 489 | pam_end(sshpam_handle, sshpam_err); |
| 490 | sshpam_handle = NULL; |
| 491 | return (-1); |
| 492 | } |
| 493 | #endif |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 494 | return (0); |
| 495 | } |
| 496 | |
| 497 | static void * |
| 498 | sshpam_init_ctx(Authctxt *authctxt) |
| 499 | { |
| 500 | struct pam_ctxt *ctxt; |
| 501 | int socks[2]; |
| 502 | |
Darren Tucker | a8df924 | 2004-01-15 00:15:07 +1100 | [diff] [blame] | 503 | debug3("PAM: %s entering", __func__); |
Damien Miller | 4e448a3 | 2003-05-14 15:11:48 +1000 | [diff] [blame] | 504 | /* Refuse to start if we don't have PAM enabled */ |
| 505 | if (!options.use_pam) |
| 506 | return NULL; |
| 507 | |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 508 | /* Initialize PAM */ |
| 509 | if (sshpam_init(authctxt->user) == -1) { |
| 510 | error("PAM: initialization failed"); |
| 511 | return (NULL); |
| 512 | } |
| 513 | |
| 514 | ctxt = xmalloc(sizeof *ctxt); |
Darren Tucker | 8846a07 | 2003-10-07 11:30:15 +1000 | [diff] [blame] | 515 | memset(ctxt, 0, sizeof(*ctxt)); |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 516 | |
Darren Tucker | 1921ed9 | 2004-02-10 13:23:28 +1100 | [diff] [blame] | 517 | force_pwchange = &(authctxt->force_pwchange); |
| 518 | |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 519 | /* Start the authentication thread */ |
| 520 | if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, socks) == -1) { |
| 521 | error("PAM: failed create sockets: %s", strerror(errno)); |
| 522 | xfree(ctxt); |
| 523 | return (NULL); |
| 524 | } |
| 525 | ctxt->pam_psock = socks[0]; |
| 526 | ctxt->pam_csock = socks[1]; |
| 527 | if (pthread_create(&ctxt->pam_thread, NULL, sshpam_thread, ctxt) == -1) { |
| 528 | error("PAM: failed to start authentication thread: %s", |
| 529 | strerror(errno)); |
| 530 | close(socks[0]); |
| 531 | close(socks[1]); |
| 532 | xfree(ctxt); |
| 533 | return (NULL); |
| 534 | } |
Darren Tucker | 8846a07 | 2003-10-07 11:30:15 +1000 | [diff] [blame] | 535 | cleanup_ctxt = ctxt; |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 536 | return (ctxt); |
| 537 | } |
| 538 | |
| 539 | static int |
| 540 | sshpam_query(void *ctx, char **name, char **info, |
| 541 | u_int *num, char ***prompts, u_int **echo_on) |
| 542 | { |
| 543 | Buffer buffer; |
| 544 | struct pam_ctxt *ctxt = ctx; |
| 545 | size_t plen; |
| 546 | u_char type; |
| 547 | char *msg; |
Damien Miller | 7f2d795 | 2003-07-30 14:53:11 +1000 | [diff] [blame] | 548 | size_t len; |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 549 | |
Darren Tucker | a8df924 | 2004-01-15 00:15:07 +1100 | [diff] [blame] | 550 | debug3("PAM: %s entering", __func__); |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 551 | buffer_init(&buffer); |
| 552 | *name = xstrdup(""); |
| 553 | *info = xstrdup(""); |
| 554 | *prompts = xmalloc(sizeof(char *)); |
| 555 | **prompts = NULL; |
| 556 | plen = 0; |
| 557 | *echo_on = xmalloc(sizeof(u_int)); |
| 558 | while (ssh_msg_recv(ctxt->pam_psock, &buffer) == 0) { |
| 559 | type = buffer_get_char(&buffer); |
| 560 | msg = buffer_get_string(&buffer, NULL); |
| 561 | switch (type) { |
| 562 | case PAM_PROMPT_ECHO_ON: |
| 563 | case PAM_PROMPT_ECHO_OFF: |
| 564 | *num = 1; |
Damien Miller | 7f2d795 | 2003-07-30 14:53:11 +1000 | [diff] [blame] | 565 | len = plen + strlen(msg) + 1; |
| 566 | **prompts = xrealloc(**prompts, len); |
| 567 | plen += snprintf(**prompts + plen, len, "%s", msg); |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 568 | **echo_on = (type == PAM_PROMPT_ECHO_ON); |
| 569 | xfree(msg); |
| 570 | return (0); |
| 571 | case PAM_ERROR_MSG: |
| 572 | case PAM_TEXT_INFO: |
| 573 | /* accumulate messages */ |
Darren Tucker | ae52b7c | 2003-11-13 19:52:31 +1100 | [diff] [blame] | 574 | len = plen + strlen(msg) + 2; |
Damien Miller | 7f2d795 | 2003-07-30 14:53:11 +1000 | [diff] [blame] | 575 | **prompts = xrealloc(**prompts, len); |
Darren Tucker | ae52b7c | 2003-11-13 19:52:31 +1100 | [diff] [blame] | 576 | plen += snprintf(**prompts + plen, len, "%s\n", msg); |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 577 | xfree(msg); |
| 578 | break; |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 579 | case PAM_SUCCESS: |
| 580 | case PAM_AUTH_ERR: |
| 581 | if (**prompts != NULL) { |
| 582 | /* drain any accumulated messages */ |
Darren Tucker | 18df00c | 2003-11-18 12:42:07 +1100 | [diff] [blame] | 583 | debug("PAM: %s", **prompts); |
| 584 | buffer_append(&loginmsg, **prompts, |
| 585 | strlen(**prompts)); |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 586 | xfree(**prompts); |
| 587 | **prompts = NULL; |
| 588 | } |
| 589 | if (type == PAM_SUCCESS) { |
Damien Miller | c756e9b | 2003-11-17 21:41:42 +1100 | [diff] [blame] | 590 | import_environments(&buffer); |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 591 | *num = 0; |
| 592 | **echo_on = 0; |
| 593 | ctxt->pam_done = 1; |
| 594 | xfree(msg); |
| 595 | return (0); |
| 596 | } |
| 597 | error("PAM: %s", msg); |
Darren Tucker | 439ce0d | 2003-10-09 14:20:15 +1000 | [diff] [blame] | 598 | /* FALLTHROUGH */ |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 599 | default: |
| 600 | *num = 0; |
| 601 | **echo_on = 0; |
| 602 | xfree(msg); |
| 603 | ctxt->pam_done = -1; |
| 604 | return (-1); |
| 605 | } |
| 606 | } |
| 607 | return (-1); |
| 608 | } |
| 609 | |
| 610 | /* XXX - see also comment in auth-chall.c:verify_response */ |
| 611 | static int |
| 612 | sshpam_respond(void *ctx, u_int num, char **resp) |
| 613 | { |
| 614 | Buffer buffer; |
| 615 | struct pam_ctxt *ctxt = ctx; |
| 616 | |
Darren Tucker | a8df924 | 2004-01-15 00:15:07 +1100 | [diff] [blame] | 617 | debug2("PAM: %s entering, %d responses", __func__, num); |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 618 | switch (ctxt->pam_done) { |
| 619 | case 1: |
| 620 | sshpam_authenticated = 1; |
| 621 | return (0); |
| 622 | case 0: |
| 623 | break; |
| 624 | default: |
| 625 | return (-1); |
| 626 | } |
| 627 | if (num != 1) { |
| 628 | error("PAM: expected one response, got %u", num); |
| 629 | return (-1); |
| 630 | } |
| 631 | buffer_init(&buffer); |
| 632 | buffer_put_cstring(&buffer, *resp); |
Damien Miller | 9bdba70 | 2003-11-17 21:27:55 +1100 | [diff] [blame] | 633 | if (ssh_msg_send(ctxt->pam_psock, PAM_AUTHTOK, &buffer) == -1) { |
| 634 | buffer_free(&buffer); |
| 635 | return (-1); |
| 636 | } |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 637 | buffer_free(&buffer); |
| 638 | return (1); |
| 639 | } |
| 640 | |
| 641 | static void |
| 642 | sshpam_free_ctx(void *ctxtp) |
| 643 | { |
| 644 | struct pam_ctxt *ctxt = ctxtp; |
| 645 | |
Darren Tucker | a8df924 | 2004-01-15 00:15:07 +1100 | [diff] [blame] | 646 | debug3("PAM: %s entering", __func__); |
Darren Tucker | 8846a07 | 2003-10-07 11:30:15 +1000 | [diff] [blame] | 647 | sshpam_thread_cleanup(); |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 648 | xfree(ctxt); |
| 649 | /* |
| 650 | * We don't call sshpam_cleanup() here because we may need the PAM |
| 651 | * handle at a later stage, e.g. when setting up a session. It's |
| 652 | * still on the cleanup list, so pam_end() *will* be called before |
| 653 | * the server process terminates. |
| 654 | */ |
| 655 | } |
| 656 | |
| 657 | KbdintDevice sshpam_device = { |
| 658 | "pam", |
| 659 | sshpam_init_ctx, |
| 660 | sshpam_query, |
| 661 | sshpam_respond, |
| 662 | sshpam_free_ctx |
| 663 | }; |
| 664 | |
| 665 | KbdintDevice mm_sshpam_device = { |
| 666 | "pam", |
| 667 | mm_sshpam_init_ctx, |
| 668 | mm_sshpam_query, |
| 669 | mm_sshpam_respond, |
| 670 | mm_sshpam_free_ctx |
| 671 | }; |
| 672 | |
| 673 | /* |
| 674 | * This replaces auth-pam.c |
| 675 | */ |
| 676 | void |
| 677 | start_pam(const char *user) |
| 678 | { |
Damien Miller | 9d507da | 2003-05-14 15:31:12 +1000 | [diff] [blame] | 679 | if (!options.use_pam) |
| 680 | fatal("PAM: initialisation requested when UsePAM=no"); |
| 681 | |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 682 | if (sshpam_init(user) == -1) |
| 683 | fatal("PAM: initialisation failed"); |
| 684 | } |
| 685 | |
| 686 | void |
| 687 | finish_pam(void) |
| 688 | { |
Darren Tucker | 8846a07 | 2003-10-07 11:30:15 +1000 | [diff] [blame] | 689 | sshpam_cleanup(); |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 690 | } |
| 691 | |
Damien Miller | 1f499fd | 2003-08-25 13:08:49 +1000 | [diff] [blame] | 692 | u_int |
| 693 | do_pam_account(void) |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 694 | { |
Darren Tucker | 07705c7 | 2003-12-18 15:34:31 +1100 | [diff] [blame] | 695 | if (sshpam_account_status != -1) |
| 696 | return (sshpam_account_status); |
| 697 | |
Damien Miller | 1f499fd | 2003-08-25 13:08:49 +1000 | [diff] [blame] | 698 | sshpam_err = pam_acct_mgmt(sshpam_handle, 0); |
Darren Tucker | a8df924 | 2004-01-15 00:15:07 +1100 | [diff] [blame] | 699 | debug3("PAM: %s pam_acct_mgmt = %d", __func__, sshpam_err); |
Darren Tucker | 07705c7 | 2003-12-18 15:34:31 +1100 | [diff] [blame] | 700 | |
| 701 | if (sshpam_err != PAM_SUCCESS && sshpam_err != PAM_NEW_AUTHTOK_REQD) { |
| 702 | sshpam_account_status = 0; |
| 703 | return (sshpam_account_status); |
Damien Miller | 1f499fd | 2003-08-25 13:08:49 +1000 | [diff] [blame] | 704 | } |
| 705 | |
Darren Tucker | 07705c7 | 2003-12-18 15:34:31 +1100 | [diff] [blame] | 706 | if (sshpam_err == PAM_NEW_AUTHTOK_REQD) |
| 707 | pam_password_change_required(1); |
| 708 | |
| 709 | sshpam_account_status = 1; |
| 710 | return (sshpam_account_status); |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 711 | } |
| 712 | |
| 713 | void |
Damien Miller | 341c6e6 | 2003-09-02 23:18:52 +1000 | [diff] [blame] | 714 | do_pam_set_tty(const char *tty) |
| 715 | { |
Darren Tucker | f38db7f | 2003-08-08 13:43:37 +1000 | [diff] [blame] | 716 | if (tty != NULL) { |
| 717 | debug("PAM: setting PAM_TTY to \"%s\"", tty); |
| 718 | sshpam_err = pam_set_item(sshpam_handle, PAM_TTY, tty); |
| 719 | if (sshpam_err != PAM_SUCCESS) |
| 720 | fatal("PAM: failed to set PAM_TTY: %s", |
| 721 | pam_strerror(sshpam_handle, sshpam_err)); |
| 722 | } |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 723 | } |
| 724 | |
| 725 | void |
| 726 | do_pam_setcred(int init) |
| 727 | { |
| 728 | sshpam_err = pam_set_item(sshpam_handle, PAM_CONV, |
| 729 | (const void *)&null_conv); |
| 730 | if (sshpam_err != PAM_SUCCESS) |
| 731 | fatal("PAM: failed to set PAM_CONV: %s", |
| 732 | pam_strerror(sshpam_handle, sshpam_err)); |
| 733 | if (init) { |
| 734 | debug("PAM: establishing credentials"); |
| 735 | sshpam_err = pam_setcred(sshpam_handle, PAM_ESTABLISH_CRED); |
| 736 | } else { |
| 737 | debug("PAM: reinitializing credentials"); |
| 738 | sshpam_err = pam_setcred(sshpam_handle, PAM_REINITIALIZE_CRED); |
| 739 | } |
| 740 | if (sshpam_err == PAM_SUCCESS) { |
| 741 | sshpam_cred_established = 1; |
| 742 | return; |
| 743 | } |
| 744 | if (sshpam_authenticated) |
| 745 | fatal("PAM: pam_setcred(): %s", |
| 746 | pam_strerror(sshpam_handle, sshpam_err)); |
| 747 | else |
| 748 | debug("PAM: pam_setcred(): %s", |
| 749 | pam_strerror(sshpam_handle, sshpam_err)); |
| 750 | } |
| 751 | |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 752 | static int |
Darren Tucker | 18df00c | 2003-11-18 12:42:07 +1100 | [diff] [blame] | 753 | pam_tty_conv(int n, const struct pam_message **msg, |
Damien Miller | 1f499fd | 2003-08-25 13:08:49 +1000 | [diff] [blame] | 754 | struct pam_response **resp, void *data) |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 755 | { |
| 756 | char input[PAM_MAX_MSG_SIZE]; |
Damien Miller | 5c3a558 | 2003-09-23 22:12:38 +1000 | [diff] [blame] | 757 | struct pam_response *reply; |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 758 | int i; |
| 759 | |
Darren Tucker | ba53b83 | 2004-02-17 20:46:59 +1100 | [diff] [blame] | 760 | debug3("PAM: %s called with %d messages", __func__, n); |
| 761 | |
Damien Miller | 5c3a558 | 2003-09-23 22:12:38 +1000 | [diff] [blame] | 762 | *resp = NULL; |
| 763 | |
Darren Tucker | 18df00c | 2003-11-18 12:42:07 +1100 | [diff] [blame] | 764 | if (n <= 0 || n > PAM_MAX_NUM_MSG || !isatty(STDIN_FILENO)) |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 765 | return (PAM_CONV_ERR); |
Damien Miller | 5c3a558 | 2003-09-23 22:12:38 +1000 | [diff] [blame] | 766 | |
| 767 | if ((reply = malloc(n * sizeof(*reply))) == NULL) |
| 768 | return (PAM_CONV_ERR); |
| 769 | memset(reply, 0, n * sizeof(*reply)); |
| 770 | |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 771 | for (i = 0; i < n; ++i) { |
| 772 | switch (PAM_MSG_MEMBER(msg, i, msg_style)) { |
| 773 | case PAM_PROMPT_ECHO_OFF: |
Damien Miller | 5c3a558 | 2003-09-23 22:12:38 +1000 | [diff] [blame] | 774 | reply[i].resp = |
Damien Miller | a8e06ce | 2003-11-21 23:48:55 +1100 | [diff] [blame] | 775 | read_passphrase(PAM_MSG_MEMBER(msg, i, msg), |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 776 | RP_ALLOW_STDIN); |
Damien Miller | 5c3a558 | 2003-09-23 22:12:38 +1000 | [diff] [blame] | 777 | reply[i].resp_retcode = PAM_SUCCESS; |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 778 | break; |
| 779 | case PAM_PROMPT_ECHO_ON: |
Darren Tucker | 0947ddf | 2003-11-13 11:21:31 +1100 | [diff] [blame] | 780 | fprintf(stderr, "%s\n", PAM_MSG_MEMBER(msg, i, msg)); |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 781 | fgets(input, sizeof input, stdin); |
Damien Miller | 5c3a558 | 2003-09-23 22:12:38 +1000 | [diff] [blame] | 782 | reply[i].resp = xstrdup(input); |
| 783 | reply[i].resp_retcode = PAM_SUCCESS; |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 784 | break; |
| 785 | case PAM_ERROR_MSG: |
| 786 | case PAM_TEXT_INFO: |
Darren Tucker | 0947ddf | 2003-11-13 11:21:31 +1100 | [diff] [blame] | 787 | fprintf(stderr, "%s\n", PAM_MSG_MEMBER(msg, i, msg)); |
Damien Miller | 5c3a558 | 2003-09-23 22:12:38 +1000 | [diff] [blame] | 788 | reply[i].resp_retcode = PAM_SUCCESS; |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 789 | break; |
| 790 | default: |
| 791 | goto fail; |
| 792 | } |
| 793 | } |
Damien Miller | 5c3a558 | 2003-09-23 22:12:38 +1000 | [diff] [blame] | 794 | *resp = reply; |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 795 | return (PAM_SUCCESS); |
Damien Miller | 5c3a558 | 2003-09-23 22:12:38 +1000 | [diff] [blame] | 796 | |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 797 | fail: |
Damien Miller | 5c3a558 | 2003-09-23 22:12:38 +1000 | [diff] [blame] | 798 | for(i = 0; i < n; i++) { |
| 799 | if (reply[i].resp != NULL) |
| 800 | xfree(reply[i].resp); |
| 801 | } |
| 802 | xfree(reply); |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 803 | return (PAM_CONV_ERR); |
| 804 | } |
| 805 | |
Darren Tucker | 18df00c | 2003-11-18 12:42:07 +1100 | [diff] [blame] | 806 | static struct pam_conv tty_conv = { pam_tty_conv, NULL }; |
| 807 | |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 808 | /* |
| 809 | * XXX this should be done in the authentication phase, but ssh1 doesn't |
| 810 | * support that |
| 811 | */ |
| 812 | void |
| 813 | do_pam_chauthtok(void) |
| 814 | { |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 815 | if (use_privsep) |
Damien Miller | 1f499fd | 2003-08-25 13:08:49 +1000 | [diff] [blame] | 816 | fatal("Password expired (unable to change with privsep)"); |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 817 | sshpam_err = pam_set_item(sshpam_handle, PAM_CONV, |
Darren Tucker | 18df00c | 2003-11-18 12:42:07 +1100 | [diff] [blame] | 818 | (const void *)&tty_conv); |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 819 | if (sshpam_err != PAM_SUCCESS) |
| 820 | fatal("PAM: failed to set PAM_CONV: %s", |
| 821 | pam_strerror(sshpam_handle, sshpam_err)); |
| 822 | debug("PAM: changing password"); |
| 823 | sshpam_err = pam_chauthtok(sshpam_handle, PAM_CHANGE_EXPIRED_AUTHTOK); |
| 824 | if (sshpam_err != PAM_SUCCESS) |
| 825 | fatal("PAM: pam_chauthtok(): %s", |
| 826 | pam_strerror(sshpam_handle, sshpam_err)); |
| 827 | } |
| 828 | |
Darren Tucker | 5cf8ef7 | 2004-02-17 23:20:07 +1100 | [diff] [blame] | 829 | static int |
| 830 | pam_store_conv(int n, const struct pam_message **msg, |
| 831 | struct pam_response **resp, void *data) |
| 832 | { |
| 833 | struct pam_response *reply; |
| 834 | int i; |
| 835 | size_t len; |
| 836 | |
| 837 | debug3("PAM: %s called with %d messages", __func__, n); |
| 838 | *resp = NULL; |
| 839 | |
| 840 | if (n <= 0 || n > PAM_MAX_NUM_MSG) |
| 841 | return (PAM_CONV_ERR); |
| 842 | |
| 843 | if ((reply = malloc(n * sizeof(*reply))) == NULL) |
| 844 | return (PAM_CONV_ERR); |
| 845 | memset(reply, 0, n * sizeof(*reply)); |
| 846 | |
| 847 | for (i = 0; i < n; ++i) { |
| 848 | switch (PAM_MSG_MEMBER(msg, i, msg_style)) { |
| 849 | case PAM_ERROR_MSG: |
| 850 | case PAM_TEXT_INFO: |
| 851 | len = strlen(PAM_MSG_MEMBER(msg, i, msg)); |
| 852 | buffer_append(&loginmsg, PAM_MSG_MEMBER(msg, i, msg), len); |
| 853 | buffer_append(&loginmsg, "\n", 1 ); |
| 854 | reply[i].resp_retcode = PAM_SUCCESS; |
| 855 | break; |
| 856 | default: |
| 857 | goto fail; |
| 858 | } |
| 859 | } |
| 860 | *resp = reply; |
| 861 | return (PAM_SUCCESS); |
| 862 | |
| 863 | fail: |
| 864 | for(i = 0; i < n; i++) { |
| 865 | if (reply[i].resp != NULL) |
| 866 | xfree(reply[i].resp); |
| 867 | } |
| 868 | xfree(reply); |
| 869 | return (PAM_CONV_ERR); |
| 870 | } |
| 871 | |
| 872 | static struct pam_conv store_conv = { pam_store_conv, NULL }; |
| 873 | |
Darren Tucker | 18df00c | 2003-11-18 12:42:07 +1100 | [diff] [blame] | 874 | void |
| 875 | do_pam_session(void) |
| 876 | { |
Darren Tucker | 1921ed9 | 2004-02-10 13:23:28 +1100 | [diff] [blame] | 877 | debug3("PAM: opening session"); |
Damien Miller | a8e06ce | 2003-11-21 23:48:55 +1100 | [diff] [blame] | 878 | sshpam_err = pam_set_item(sshpam_handle, PAM_CONV, |
Darren Tucker | 5cf8ef7 | 2004-02-17 23:20:07 +1100 | [diff] [blame] | 879 | (const void *)&store_conv); |
Darren Tucker | 18df00c | 2003-11-18 12:42:07 +1100 | [diff] [blame] | 880 | if (sshpam_err != PAM_SUCCESS) |
| 881 | fatal("PAM: failed to set PAM_CONV: %s", |
| 882 | pam_strerror(sshpam_handle, sshpam_err)); |
| 883 | sshpam_err = pam_open_session(sshpam_handle, 0); |
| 884 | if (sshpam_err != PAM_SUCCESS) |
| 885 | fatal("PAM: pam_open_session(): %s", |
| 886 | pam_strerror(sshpam_handle, sshpam_err)); |
| 887 | sshpam_session_open = 1; |
| 888 | } |
| 889 | |
Damien Miller | a8e06ce | 2003-11-21 23:48:55 +1100 | [diff] [blame] | 890 | /* |
Darren Tucker | 49aaf4a | 2003-08-26 11:58:16 +1000 | [diff] [blame] | 891 | * Set a PAM environment string. We need to do this so that the session |
| 892 | * modules can handle things like Kerberos/GSI credentials that appear |
| 893 | * during the ssh authentication process. |
| 894 | */ |
Darren Tucker | 49aaf4a | 2003-08-26 11:58:16 +1000 | [diff] [blame] | 895 | int |
Damien Miller | a8e06ce | 2003-11-21 23:48:55 +1100 | [diff] [blame] | 896 | do_pam_putenv(char *name, char *value) |
Darren Tucker | 49aaf4a | 2003-08-26 11:58:16 +1000 | [diff] [blame] | 897 | { |
Darren Tucker | 49aaf4a | 2003-08-26 11:58:16 +1000 | [diff] [blame] | 898 | int ret = 1; |
Damien Miller | 787b2ec | 2003-11-21 23:56:47 +1100 | [diff] [blame] | 899 | #ifdef HAVE_PAM_PUTENV |
Damien Miller | f272809 | 2003-09-17 07:24:25 +1000 | [diff] [blame] | 900 | char *compound; |
| 901 | size_t len; |
| 902 | |
| 903 | len = strlen(name) + strlen(value) + 2; |
| 904 | compound = xmalloc(len); |
| 905 | |
| 906 | snprintf(compound, len, "%s=%s", name, value); |
| 907 | ret = pam_putenv(sshpam_handle, compound); |
| 908 | xfree(compound); |
Darren Tucker | 49aaf4a | 2003-08-26 11:58:16 +1000 | [diff] [blame] | 909 | #endif |
Damien Miller | f272809 | 2003-09-17 07:24:25 +1000 | [diff] [blame] | 910 | |
Darren Tucker | 49aaf4a | 2003-08-26 11:58:16 +1000 | [diff] [blame] | 911 | return (ret); |
| 912 | } |
| 913 | |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 914 | char ** |
Damien Miller | c756e9b | 2003-11-17 21:41:42 +1100 | [diff] [blame] | 915 | fetch_pam_child_environment(void) |
| 916 | { |
| 917 | return sshpam_env; |
| 918 | } |
| 919 | |
| 920 | char ** |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 921 | fetch_pam_environment(void) |
| 922 | { |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 923 | return (pam_getenvlist(sshpam_handle)); |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 924 | } |
| 925 | |
| 926 | void |
| 927 | free_pam_environment(char **env) |
| 928 | { |
| 929 | char **envp; |
| 930 | |
Damien Miller | e27c6cc | 2003-05-16 18:21:01 +1000 | [diff] [blame] | 931 | if (env == NULL) |
| 932 | return; |
| 933 | |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 934 | for (envp = env; *envp; envp++) |
| 935 | xfree(*envp); |
| 936 | xfree(env); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 937 | } |
| 938 | |
| 939 | #endif /* USE_PAM */ |