Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 1 | /* |
Damien Miller | e69f18c | 2000-06-12 16:38:54 +1000 | [diff] [blame] | 2 | * Copyright (c) 2000 Damien Miller. All rights reserved. |
| 3 | * |
| 4 | * Redistribution and use in source and binary forms, with or without |
| 5 | * modification, are permitted provided that the following conditions |
| 6 | * are met: |
| 7 | * 1. Redistributions of source code must retain the above copyright |
| 8 | * notice, this list of conditions and the following disclaimer. |
| 9 | * 2. Redistributions in binary form must reproduce the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer in the |
| 11 | * documentation and/or other materials provided with the distribution. |
Damien Miller | e69f18c | 2000-06-12 16:38:54 +1000 | [diff] [blame] | 12 | * |
| 13 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 14 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 15 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 16 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 17 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 18 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 19 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 20 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 21 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 22 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 23 | */ |
| 24 | |
| 25 | #include "includes.h" |
| 26 | |
| 27 | #ifdef USE_PAM |
| 28 | #include "ssh.h" |
| 29 | #include "xmalloc.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 30 | #include "log.h" |
Kevin Steves | e683e76 | 2002-04-04 19:02:28 +0000 | [diff] [blame] | 31 | #include "auth.h" |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 32 | #include "auth-pam.h" |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 33 | #include "servconf.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 34 | #include "canohost.h" |
| 35 | #include "readpass.h" |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 36 | |
Kevin Steves | 85ecbe7 | 2001-04-20 17:43:47 +0000 | [diff] [blame] | 37 | extern char *__progname; |
| 38 | |
Damien Miller | 23fe57c | 2002-07-02 17:08:23 +1000 | [diff] [blame] | 39 | RCSID("$Id: auth-pam.c,v 1.47 2002/07/02 07:08:24 djm Exp $"); |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 40 | |
| 41 | #define NEW_AUTHTOK_MSG \ |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 42 | "Warning: Your password has expired, please change it now" |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 43 | |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 44 | static int do_pam_conversation(int num_msg, const struct pam_message **msg, |
| 45 | struct pam_response **resp, void *appdata_ptr); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 46 | |
| 47 | /* module-local variables */ |
| 48 | static struct pam_conv conv = { |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 49 | do_pam_conversation, |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 50 | NULL |
| 51 | }; |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 52 | static char *__pam_msg = NULL; |
| 53 | static pam_handle_t *__pamh = NULL; |
| 54 | static const char *__pampasswd = NULL; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 55 | |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 56 | /* states for do_pam_conversation() */ |
Damien Miller | b848158 | 2000-12-03 11:51:51 +1100 | [diff] [blame] | 57 | enum { INITIAL_LOGIN, OTHER } pamstate = INITIAL_LOGIN; |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 58 | /* remember whether pam_acct_mgmt() returned PAM_NEWAUTHTOK_REQD */ |
| 59 | static int password_change_required = 0; |
Damien Miller | b848158 | 2000-12-03 11:51:51 +1100 | [diff] [blame] | 60 | /* remember whether the last pam_authenticate() succeeded or not */ |
| 61 | static int was_authenticated = 0; |
| 62 | |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 63 | /* Remember what has been initialised */ |
| 64 | static int session_opened = 0; |
| 65 | static int creds_set = 0; |
| 66 | |
Damien Miller | b848158 | 2000-12-03 11:51:51 +1100 | [diff] [blame] | 67 | /* accessor which allows us to switch conversation structs according to |
| 68 | * the authentication method being used */ |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 69 | void do_pam_set_conv(struct pam_conv *conv) |
Damien Miller | b848158 | 2000-12-03 11:51:51 +1100 | [diff] [blame] | 70 | { |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 71 | pam_set_item(__pamh, PAM_CONV, conv); |
Damien Miller | b848158 | 2000-12-03 11:51:51 +1100 | [diff] [blame] | 72 | } |
| 73 | |
| 74 | /* start an authentication run */ |
| 75 | int do_pam_authenticate(int flags) |
| 76 | { |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 77 | int retval = pam_authenticate(__pamh, flags); |
Damien Miller | b848158 | 2000-12-03 11:51:51 +1100 | [diff] [blame] | 78 | was_authenticated = (retval == PAM_SUCCESS); |
| 79 | return retval; |
| 80 | } |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 81 | |
| 82 | /* |
| 83 | * PAM conversation function. |
| 84 | * There are two states this can run in. |
| 85 | * |
| 86 | * INITIAL_LOGIN mode simply feeds the password from the client into |
| 87 | * PAM in response to PAM_PROMPT_ECHO_OFF, and collects output |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 88 | * messages with into __pam_msg. This is used during initial |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 89 | * authentication to bypass the normal PAM password prompt. |
| 90 | * |
Damien Miller | 0925648 | 2001-10-28 22:36:55 +1100 | [diff] [blame] | 91 | * OTHER mode handles PAM_PROMPT_ECHO_OFF with read_passphrase() |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 92 | * and outputs messages to stderr. This mode is used if pam_chauthtok() |
| 93 | * is called to update expired passwords. |
| 94 | */ |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 95 | static int do_pam_conversation(int num_msg, const struct pam_message **msg, |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 96 | struct pam_response **resp, void *appdata_ptr) |
| 97 | { |
| 98 | struct pam_response *reply; |
| 99 | int count; |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 100 | char buf[1024]; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 101 | |
| 102 | /* PAM will free this later */ |
Damien Miller | 23fe57c | 2002-07-02 17:08:23 +1000 | [diff] [blame] | 103 | reply = xmalloc(num_msg * sizeof(*reply)); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 104 | |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 105 | for (count = 0; count < num_msg; count++) { |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 106 | if (pamstate == INITIAL_LOGIN) { |
| 107 | /* |
| 108 | * We can't use stdio yet, queue messages for |
| 109 | * printing later |
| 110 | */ |
| 111 | switch(PAM_MSG_MEMBER(msg, count, msg_style)) { |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 112 | case PAM_PROMPT_ECHO_ON: |
Damien Miller | 23fe57c | 2002-07-02 17:08:23 +1000 | [diff] [blame] | 113 | xfree(reply); |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 114 | return PAM_CONV_ERR; |
| 115 | case PAM_PROMPT_ECHO_OFF: |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 116 | if (__pampasswd == NULL) { |
Damien Miller | 23fe57c | 2002-07-02 17:08:23 +1000 | [diff] [blame] | 117 | xfree(reply); |
Damien Miller | 60819b4 | 2000-10-14 11:16:12 +1100 | [diff] [blame] | 118 | return PAM_CONV_ERR; |
Damien Miller | 60819b4 | 2000-10-14 11:16:12 +1100 | [diff] [blame] | 119 | } |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 120 | reply[count].resp = xstrdup(__pampasswd); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 121 | reply[count].resp_retcode = PAM_SUCCESS; |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 122 | break; |
| 123 | case PAM_ERROR_MSG: |
| 124 | case PAM_TEXT_INFO: |
Damien Miller | 23fe57c | 2002-07-02 17:08:23 +1000 | [diff] [blame] | 125 | if (PAM_MSG_MEMBER(msg, count, msg) != NULL) { |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 126 | message_cat(&__pam_msg, |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 127 | PAM_MSG_MEMBER(msg, count, msg)); |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 128 | } |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 129 | reply[count].resp = xstrdup(""); |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 130 | reply[count].resp_retcode = PAM_SUCCESS; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 131 | break; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 132 | default: |
Damien Miller | 23fe57c | 2002-07-02 17:08:23 +1000 | [diff] [blame] | 133 | xfree(reply); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 134 | return PAM_CONV_ERR; |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 135 | } |
| 136 | } else { |
| 137 | /* |
| 138 | * stdio is connected, so interact directly |
| 139 | */ |
| 140 | switch(PAM_MSG_MEMBER(msg, count, msg_style)) { |
| 141 | case PAM_PROMPT_ECHO_ON: |
| 142 | fputs(PAM_MSG_MEMBER(msg, count, msg), stderr); |
| 143 | fgets(buf, sizeof(buf), stdin); |
| 144 | reply[count].resp = xstrdup(buf); |
| 145 | reply[count].resp_retcode = PAM_SUCCESS; |
| 146 | break; |
| 147 | case PAM_PROMPT_ECHO_OFF: |
Damien Miller | 0925648 | 2001-10-28 22:36:55 +1100 | [diff] [blame] | 148 | reply[count].resp = |
Kevin Steves | fe2f4a1 | 2001-10-28 17:32:38 +0000 | [diff] [blame] | 149 | read_passphrase(PAM_MSG_MEMBER(msg, count, |
| 150 | msg), RP_ALLOW_STDIN); |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 151 | reply[count].resp_retcode = PAM_SUCCESS; |
| 152 | break; |
| 153 | case PAM_ERROR_MSG: |
| 154 | case PAM_TEXT_INFO: |
| 155 | if ((*msg)[count].msg != NULL) |
| 156 | fprintf(stderr, "%s\n", |
| 157 | PAM_MSG_MEMBER(msg, count, msg)); |
| 158 | reply[count].resp = xstrdup(""); |
| 159 | reply[count].resp_retcode = PAM_SUCCESS; |
| 160 | break; |
| 161 | default: |
Damien Miller | 23fe57c | 2002-07-02 17:08:23 +1000 | [diff] [blame] | 162 | xfree(reply); |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 163 | return PAM_CONV_ERR; |
| 164 | } |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 165 | } |
| 166 | } |
| 167 | |
| 168 | *resp = reply; |
| 169 | |
| 170 | return PAM_SUCCESS; |
| 171 | } |
| 172 | |
| 173 | /* Called at exit to cleanly shutdown PAM */ |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 174 | void do_pam_cleanup_proc(void *context) |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 175 | { |
Damien Miller | 2e9adb2 | 2001-03-21 12:16:24 +1100 | [diff] [blame] | 176 | int pam_retval = PAM_SUCCESS; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 177 | |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 178 | if (__pamh && session_opened) { |
| 179 | pam_retval = pam_close_session(__pamh, 0); |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 180 | if (pam_retval != PAM_SUCCESS) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 181 | log("Cannot close PAM session[%d]: %.200s", |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 182 | pam_retval, PAM_STRERROR(__pamh, pam_retval)); |
Damien Miller | 3dfeee4 | 2001-02-14 00:43:55 +1100 | [diff] [blame] | 183 | } |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 184 | |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 185 | if (__pamh && creds_set) { |
| 186 | pam_retval = pam_setcred(__pamh, PAM_DELETE_CRED); |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 187 | if (pam_retval != PAM_SUCCESS) |
| 188 | debug("Cannot delete credentials[%d]: %.200s", |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 189 | pam_retval, PAM_STRERROR(__pamh, pam_retval)); |
Damien Miller | 3dfeee4 | 2001-02-14 00:43:55 +1100 | [diff] [blame] | 190 | } |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 191 | |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 192 | if (__pamh) { |
| 193 | pam_retval = pam_end(__pamh, pam_retval); |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 194 | if (pam_retval != PAM_SUCCESS) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 195 | log("Cannot release PAM authentication[%d]: %.200s", |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 196 | pam_retval, PAM_STRERROR(__pamh, pam_retval)); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 197 | } |
| 198 | } |
| 199 | |
| 200 | /* Attempt password authentation using PAM */ |
Kevin Steves | e683e76 | 2002-04-04 19:02:28 +0000 | [diff] [blame] | 201 | int auth_pam_password(Authctxt *authctxt, const char *password) |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 202 | { |
| 203 | extern ServerOptions options; |
| 204 | int pam_retval; |
Kevin Steves | e683e76 | 2002-04-04 19:02:28 +0000 | [diff] [blame] | 205 | struct passwd *pw = authctxt->pw; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 206 | |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 207 | do_pam_set_conv(&conv); |
Damien Miller | b848158 | 2000-12-03 11:51:51 +1100 | [diff] [blame] | 208 | |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 209 | /* deny if no user. */ |
| 210 | if (pw == NULL) |
| 211 | return 0; |
Kevin Steves | 706e7a9 | 2001-04-23 18:38:37 +0000 | [diff] [blame] | 212 | if (pw->pw_uid == 0 && options.permit_root_login == PERMIT_NO_PASSWD) |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 213 | return 0; |
| 214 | if (*password == '\0' && options.permit_empty_passwd == 0) |
| 215 | return 0; |
| 216 | |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 217 | __pampasswd = password; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 218 | |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 219 | pamstate = INITIAL_LOGIN; |
Kevin Steves | de77b46 | 2001-11-09 20:22:16 +0000 | [diff] [blame] | 220 | pam_retval = do_pam_authenticate( |
| 221 | options.permit_empty_passwd == 0 ? PAM_DISALLOW_NULL_AUTHTOK : 0); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 222 | if (pam_retval == PAM_SUCCESS) { |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 223 | debug("PAM Password authentication accepted for " |
| 224 | "user \"%.100s\"", pw->pw_name); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 225 | return 1; |
| 226 | } else { |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 227 | debug("PAM Password authentication for \"%.100s\" " |
| 228 | "failed[%d]: %s", pw->pw_name, pam_retval, |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 229 | PAM_STRERROR(__pamh, pam_retval)); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 230 | return 0; |
| 231 | } |
| 232 | } |
| 233 | |
| 234 | /* Do account management using PAM */ |
| 235 | int do_pam_account(char *username, char *remote_user) |
| 236 | { |
| 237 | int pam_retval; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 238 | |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 239 | do_pam_set_conv(&conv); |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 240 | |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 241 | if (remote_user) { |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 242 | debug("PAM setting ruser to \"%.200s\"", remote_user); |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 243 | pam_retval = pam_set_item(__pamh, PAM_RUSER, remote_user); |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 244 | if (pam_retval != PAM_SUCCESS) |
| 245 | fatal("PAM set ruser failed[%d]: %.200s", pam_retval, |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 246 | PAM_STRERROR(__pamh, pam_retval)); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 247 | } |
| 248 | |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 249 | pam_retval = pam_acct_mgmt(__pamh, 0); |
Damien Miller | 7941855 | 2002-04-23 20:28:48 +1000 | [diff] [blame] | 250 | debug2("pam_acct_mgmt() = %d", pam_retval); |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 251 | switch (pam_retval) { |
| 252 | case PAM_SUCCESS: |
| 253 | /* This is what we want */ |
| 254 | break; |
Damien Miller | ae9d5af | 2002-04-26 11:27:24 +1000 | [diff] [blame] | 255 | #if 0 |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 256 | case PAM_NEW_AUTHTOK_REQD: |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 257 | message_cat(&__pam_msg, NEW_AUTHTOK_MSG); |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 258 | /* flag that password change is necessary */ |
| 259 | password_change_required = 1; |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 260 | break; |
Damien Miller | ae9d5af | 2002-04-26 11:27:24 +1000 | [diff] [blame] | 261 | #endif |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 262 | default: |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 263 | log("PAM rejected by account configuration[%d]: " |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 264 | "%.200s", pam_retval, PAM_STRERROR(__pamh, |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 265 | pam_retval)); |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 266 | return(0); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 267 | } |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 268 | |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 269 | return(1); |
| 270 | } |
| 271 | |
| 272 | /* Do PAM-specific session initialisation */ |
Damien Miller | 3e955e7 | 2000-01-27 10:55:38 +1100 | [diff] [blame] | 273 | void do_pam_session(char *username, const char *ttyname) |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 274 | { |
| 275 | int pam_retval; |
| 276 | |
Damien Miller | 882c2ee | 2001-03-01 09:18:57 +1100 | [diff] [blame] | 277 | do_pam_set_conv(&conv); |
| 278 | |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 279 | if (ttyname != NULL) { |
| 280 | debug("PAM setting tty to \"%.200s\"", ttyname); |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 281 | pam_retval = pam_set_item(__pamh, PAM_TTY, ttyname); |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 282 | if (pam_retval != PAM_SUCCESS) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 283 | fatal("PAM set tty failed[%d]: %.200s", |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 284 | pam_retval, PAM_STRERROR(__pamh, pam_retval)); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 285 | } |
| 286 | |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 287 | pam_retval = pam_open_session(__pamh, 0); |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 288 | if (pam_retval != PAM_SUCCESS) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 289 | fatal("PAM session setup failed[%d]: %.200s", |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 290 | pam_retval, PAM_STRERROR(__pamh, pam_retval)); |
Damien Miller | 31a501d | 2001-02-27 09:20:48 +1100 | [diff] [blame] | 291 | |
Damien Miller | 3dfeee4 | 2001-02-14 00:43:55 +1100 | [diff] [blame] | 292 | session_opened = 1; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 293 | } |
| 294 | |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 295 | /* Set PAM credentials */ |
Damien Miller | f9e9300 | 2001-03-27 16:12:24 +1000 | [diff] [blame] | 296 | void do_pam_setcred(int init) |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 297 | { |
| 298 | int pam_retval; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 299 | |
Damien Miller | f762a4b | 2002-05-08 12:27:55 +1000 | [diff] [blame] | 300 | if (__pamh == NULL) |
| 301 | return; |
| 302 | |
Damien Miller | 882c2ee | 2001-03-01 09:18:57 +1100 | [diff] [blame] | 303 | do_pam_set_conv(&conv); |
| 304 | |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 305 | debug("PAM establishing creds"); |
Damien Miller | f9e9300 | 2001-03-27 16:12:24 +1000 | [diff] [blame] | 306 | pam_retval = pam_setcred(__pamh, |
| 307 | init ? PAM_ESTABLISH_CRED : PAM_REINITIALIZE_CRED); |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 308 | if (pam_retval != PAM_SUCCESS) { |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 309 | if (was_authenticated) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 310 | fatal("PAM setcred failed[%d]: %.200s", |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 311 | pam_retval, PAM_STRERROR(__pamh, pam_retval)); |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 312 | else |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 313 | debug("PAM setcred failed[%d]: %.200s", |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 314 | pam_retval, PAM_STRERROR(__pamh, pam_retval)); |
Damien Miller | 3dfeee4 | 2001-02-14 00:43:55 +1100 | [diff] [blame] | 315 | } else |
| 316 | creds_set = 1; |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 317 | } |
| 318 | |
Kevin Steves | 092f2ef | 2000-10-14 13:36:13 +0000 | [diff] [blame] | 319 | /* accessor function for file scope static variable */ |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 320 | int is_pam_password_change_required(void) |
Kevin Steves | 092f2ef | 2000-10-14 13:36:13 +0000 | [diff] [blame] | 321 | { |
| 322 | return password_change_required; |
| 323 | } |
| 324 | |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 325 | /* |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 326 | * Have user change authentication token if pam_acct_mgmt() indicated |
| 327 | * it was expired. This needs to be called after an interactive |
| 328 | * session is established and the user's pty is connected to |
| 329 | * stdin/stout/stderr. |
| 330 | */ |
Kevin Steves | 6beac8c | 2000-10-14 15:08:49 +0000 | [diff] [blame] | 331 | void do_pam_chauthtok(void) |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 332 | { |
| 333 | int pam_retval; |
| 334 | |
Damien Miller | 882c2ee | 2001-03-01 09:18:57 +1100 | [diff] [blame] | 335 | do_pam_set_conv(&conv); |
| 336 | |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 337 | if (password_change_required) { |
| 338 | pamstate = OTHER; |
Damien Miller | ec7e1b1 | 2001-03-21 13:01:35 +1100 | [diff] [blame] | 339 | pam_retval = pam_chauthtok(__pamh, PAM_CHANGE_EXPIRED_AUTHTOK); |
| 340 | if (pam_retval != PAM_SUCCESS) |
| 341 | fatal("PAM pam_chauthtok failed[%d]: %.200s", |
| 342 | pam_retval, PAM_STRERROR(__pamh, pam_retval)); |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 343 | } |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 344 | } |
| 345 | |
| 346 | /* Cleanly shutdown PAM */ |
| 347 | void finish_pam(void) |
| 348 | { |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 349 | do_pam_cleanup_proc(NULL); |
| 350 | fatal_remove_cleanup(&do_pam_cleanup_proc, NULL); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 351 | } |
| 352 | |
| 353 | /* Start PAM authentication for specified account */ |
Damien Miller | 22e22bf | 2001-01-19 15:46:38 +1100 | [diff] [blame] | 354 | void start_pam(const char *user) |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 355 | { |
| 356 | int pam_retval; |
Damien Miller | ac2b1a5 | 2001-02-11 22:39:19 +1100 | [diff] [blame] | 357 | extern ServerOptions options; |
Kevin Steves | 5f3b9b9 | 2001-04-23 17:28:28 +0000 | [diff] [blame] | 358 | extern u_int utmp_len; |
| 359 | const char *rhost; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 360 | |
Damien Miller | 22e22bf | 2001-01-19 15:46:38 +1100 | [diff] [blame] | 361 | debug("Starting up PAM with username \"%.200s\"", user); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 362 | |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 363 | pam_retval = pam_start(SSHD_PAM_SERVICE, user, &conv, &__pamh); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 364 | |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 365 | if (pam_retval != PAM_SUCCESS) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 366 | fatal("PAM initialisation failed[%d]: %.200s", |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 367 | pam_retval, PAM_STRERROR(__pamh, pam_retval)); |
Damien Miller | bd5817d | 2001-02-11 22:35:11 +1100 | [diff] [blame] | 368 | |
Damien Miller | f3451a2 | 2002-02-05 12:40:46 +1100 | [diff] [blame] | 369 | rhost = get_remote_name_or_ip(utmp_len, options.verify_reverse_mapping); |
Kevin Steves | 5f3b9b9 | 2001-04-23 17:28:28 +0000 | [diff] [blame] | 370 | debug("PAM setting rhost to \"%.200s\"", rhost); |
| 371 | |
| 372 | pam_retval = pam_set_item(__pamh, PAM_RHOST, rhost); |
Damien Miller | bd5817d | 2001-02-11 22:35:11 +1100 | [diff] [blame] | 373 | if (pam_retval != PAM_SUCCESS) |
| 374 | fatal("PAM set rhost failed[%d]: %.200s", pam_retval, |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 375 | PAM_STRERROR(__pamh, pam_retval)); |
Damien Miller | 4e99720 | 2000-07-09 21:21:52 +1000 | [diff] [blame] | 376 | #ifdef PAM_TTY_KLUDGE |
Damien Miller | c19fd5f | 2000-06-22 21:44:54 +1000 | [diff] [blame] | 377 | /* |
| 378 | * Some PAM modules (e.g. pam_time) require a TTY to operate, |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 379 | * and will fail in various stupid ways if they don't get one. |
Damien Miller | c19fd5f | 2000-06-22 21:44:54 +1000 | [diff] [blame] | 380 | * sshd doesn't set the tty until too late in the auth process and may |
| 381 | * not even need one (for tty-less connections) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 382 | * Kludge: Set a fake PAM_TTY |
Damien Miller | c19fd5f | 2000-06-22 21:44:54 +1000 | [diff] [blame] | 383 | */ |
Damien Miller | 33cdd9e | 2001-10-28 22:33:48 +1100 | [diff] [blame] | 384 | pam_retval = pam_set_item(__pamh, PAM_TTY, "NODEVssh"); |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 385 | if (pam_retval != PAM_SUCCESS) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 386 | fatal("PAM set tty failed[%d]: %.200s", |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 387 | pam_retval, PAM_STRERROR(__pamh, pam_retval)); |
Damien Miller | 4e99720 | 2000-07-09 21:21:52 +1000 | [diff] [blame] | 388 | #endif /* PAM_TTY_KLUDGE */ |
Damien Miller | 7b22d65 | 2000-06-18 14:07:04 +1000 | [diff] [blame] | 389 | |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 390 | fatal_add_cleanup(&do_pam_cleanup_proc, NULL); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 391 | } |
| 392 | |
| 393 | /* Return list of PAM enviornment strings */ |
| 394 | char **fetch_pam_environment(void) |
| 395 | { |
Damien Miller | 1bead33 | 2000-04-30 00:47:29 +1000 | [diff] [blame] | 396 | #ifdef HAVE_PAM_GETENVLIST |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 397 | return(pam_getenvlist(__pamh)); |
Damien Miller | 1bead33 | 2000-04-30 00:47:29 +1000 | [diff] [blame] | 398 | #else /* HAVE_PAM_GETENVLIST */ |
| 399 | return(NULL); |
| 400 | #endif /* HAVE_PAM_GETENVLIST */ |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 401 | } |
| 402 | |
| 403 | /* Print any messages that have been generated during authentication */ |
| 404 | /* or account checking to stderr */ |
| 405 | void print_pam_messages(void) |
| 406 | { |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 407 | if (__pam_msg != NULL) |
| 408 | fputs(__pam_msg, stderr); |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 409 | } |
| 410 | |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 411 | /* Append a message to buffer */ |
| 412 | void message_cat(char **p, const char *a) |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 413 | { |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 414 | char *cp; |
| 415 | size_t new_len; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 416 | |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 417 | new_len = strlen(a); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 418 | |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 419 | if (*p) { |
| 420 | size_t len = strlen(*p); |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 421 | |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 422 | *p = xrealloc(*p, new_len + len + 2); |
| 423 | cp = *p + len; |
| 424 | } else |
| 425 | *p = cp = xmalloc(new_len + 2); |
| 426 | |
| 427 | memcpy(cp, a, new_len); |
| 428 | cp[new_len] = '\n'; |
| 429 | cp[new_len + 1] = '\0'; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 430 | } |
| 431 | |
| 432 | #endif /* USE_PAM */ |