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" |
| 30 | #include "servconf.h" |
| 31 | |
Damien Miller | 82cf0ce | 2000-12-20 13:34:48 +1100 | [diff] [blame^] | 32 | RCSID("$Id: auth-pam.c,v 1.20 2000/12/20 02:34:49 djm Exp $"); |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 33 | |
| 34 | #define NEW_AUTHTOK_MSG \ |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 35 | "Warning: Your password has expired, please change it now" |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 36 | |
| 37 | /* Callbacks */ |
| 38 | static int pamconv(int num_msg, const struct pam_message **msg, |
| 39 | struct pam_response **resp, void *appdata_ptr); |
| 40 | void pam_cleanup_proc(void *context); |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 41 | void pam_msg_cat(const char *msg); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 42 | |
| 43 | /* module-local variables */ |
| 44 | static struct pam_conv conv = { |
| 45 | pamconv, |
| 46 | NULL |
| 47 | }; |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 48 | static pam_handle_t *pamh = NULL; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 49 | static const char *pampasswd = NULL; |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 50 | static char *pam_msg = NULL; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 51 | |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 52 | /* states for pamconv() */ |
Damien Miller | b848158 | 2000-12-03 11:51:51 +1100 | [diff] [blame] | 53 | enum { INITIAL_LOGIN, OTHER } pamstate = INITIAL_LOGIN; |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 54 | /* remember whether pam_acct_mgmt() returned PAM_NEWAUTHTOK_REQD */ |
| 55 | static int password_change_required = 0; |
Damien Miller | b848158 | 2000-12-03 11:51:51 +1100 | [diff] [blame] | 56 | /* remember whether the last pam_authenticate() succeeded or not */ |
| 57 | static int was_authenticated = 0; |
| 58 | |
| 59 | /* accessor which allows us to switch conversation structs according to |
| 60 | * the authentication method being used */ |
| 61 | void pam_set_conv(struct pam_conv *conv) |
| 62 | { |
| 63 | pam_set_item(pamh, PAM_CONV, conv); |
| 64 | } |
| 65 | |
| 66 | /* start an authentication run */ |
| 67 | int do_pam_authenticate(int flags) |
| 68 | { |
| 69 | int retval = pam_authenticate(pamh, flags); |
| 70 | was_authenticated = (retval == PAM_SUCCESS); |
| 71 | return retval; |
| 72 | } |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 73 | |
| 74 | /* |
| 75 | * PAM conversation function. |
| 76 | * There are two states this can run in. |
| 77 | * |
| 78 | * INITIAL_LOGIN mode simply feeds the password from the client into |
| 79 | * PAM in response to PAM_PROMPT_ECHO_OFF, and collects output |
| 80 | * messages with pam_msg_cat(). This is used during initial |
| 81 | * authentication to bypass the normal PAM password prompt. |
| 82 | * |
| 83 | * OTHER mode handles PAM_PROMPT_ECHO_OFF with read_passphrase(prompt, 1) |
| 84 | * and outputs messages to stderr. This mode is used if pam_chauthtok() |
| 85 | * is called to update expired passwords. |
| 86 | */ |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 87 | static int pamconv(int num_msg, const struct pam_message **msg, |
| 88 | struct pam_response **resp, void *appdata_ptr) |
| 89 | { |
| 90 | struct pam_response *reply; |
| 91 | int count; |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 92 | char buf[1024]; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 93 | |
| 94 | /* PAM will free this later */ |
| 95 | reply = malloc(num_msg * sizeof(*reply)); |
| 96 | if (reply == NULL) |
| 97 | return PAM_CONV_ERR; |
| 98 | |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 99 | for (count = 0; count < num_msg; count++) { |
Damien Miller | 82cf0ce | 2000-12-20 13:34:48 +1100 | [diff] [blame^] | 100 | switch(PAM_MSG_MEMBER(msg, count, msg_style)) { |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 101 | case PAM_PROMPT_ECHO_ON: |
Damien Miller | 60819b4 | 2000-10-14 11:16:12 +1100 | [diff] [blame] | 102 | if (pamstate == INITIAL_LOGIN) { |
| 103 | free(reply); |
| 104 | return PAM_CONV_ERR; |
| 105 | } else { |
Damien Miller | 82cf0ce | 2000-12-20 13:34:48 +1100 | [diff] [blame^] | 106 | fputs(PAM_MSG_MEMBER(msg, count, msg), stderr); |
Damien Miller | 60819b4 | 2000-10-14 11:16:12 +1100 | [diff] [blame] | 107 | fgets(buf, sizeof(buf), stdin); |
| 108 | reply[count].resp = xstrdup(buf); |
| 109 | reply[count].resp_retcode = PAM_SUCCESS; |
| 110 | break; |
| 111 | } |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 112 | case PAM_PROMPT_ECHO_OFF: |
| 113 | if (pamstate == INITIAL_LOGIN) { |
| 114 | if (pampasswd == NULL) { |
| 115 | free(reply); |
| 116 | return PAM_CONV_ERR; |
| 117 | } |
| 118 | reply[count].resp = xstrdup(pampasswd); |
Damien Miller | 60819b4 | 2000-10-14 11:16:12 +1100 | [diff] [blame] | 119 | } else { |
| 120 | reply[count].resp = |
Damien Miller | 82cf0ce | 2000-12-20 13:34:48 +1100 | [diff] [blame^] | 121 | xstrdup(read_passphrase(PAM_MSG_MEMBER(msg, count, msg), 1)); |
Damien Miller | 60819b4 | 2000-10-14 11:16:12 +1100 | [diff] [blame] | 122 | } |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 123 | reply[count].resp_retcode = PAM_SUCCESS; |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 124 | break; |
| 125 | case PAM_ERROR_MSG: |
| 126 | case PAM_TEXT_INFO: |
| 127 | if ((*msg)[count].msg != NULL) { |
| 128 | if (pamstate == INITIAL_LOGIN) |
Damien Miller | 82cf0ce | 2000-12-20 13:34:48 +1100 | [diff] [blame^] | 129 | pam_msg_cat(PAM_MSG_MEMBER(msg, count, msg)); |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 130 | else { |
Damien Miller | 82cf0ce | 2000-12-20 13:34:48 +1100 | [diff] [blame^] | 131 | fputs(PAM_MSG_MEMBER(msg, count, msg), stderr); |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 132 | fputs("\n", stderr); |
| 133 | } |
| 134 | } |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 135 | reply[count].resp = xstrdup(""); |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 136 | reply[count].resp_retcode = PAM_SUCCESS; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 137 | break; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 138 | default: |
| 139 | free(reply); |
| 140 | return PAM_CONV_ERR; |
| 141 | } |
| 142 | } |
| 143 | |
| 144 | *resp = reply; |
| 145 | |
| 146 | return PAM_SUCCESS; |
| 147 | } |
| 148 | |
| 149 | /* Called at exit to cleanly shutdown PAM */ |
| 150 | void pam_cleanup_proc(void *context) |
| 151 | { |
| 152 | int pam_retval; |
| 153 | |
| 154 | if (pamh != NULL) |
| 155 | { |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 156 | pam_retval = pam_close_session(pamh, 0); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 157 | if (pam_retval != PAM_SUCCESS) { |
Kevin Steves | cccca27 | 2000-10-07 11:16:55 +0000 | [diff] [blame] | 158 | log("Cannot close PAM session[%d]: %.200s", |
| 159 | pam_retval, PAM_STRERROR(pamh, pam_retval)); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 160 | } |
| 161 | |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 162 | pam_retval = pam_setcred(pamh, PAM_DELETE_CRED); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 163 | if (pam_retval != PAM_SUCCESS) { |
Kevin Steves | cccca27 | 2000-10-07 11:16:55 +0000 | [diff] [blame] | 164 | debug("Cannot delete credentials[%d]: %.200s", |
| 165 | pam_retval, PAM_STRERROR(pamh, pam_retval)); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 166 | } |
| 167 | |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 168 | pam_retval = pam_end(pamh, pam_retval); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 169 | if (pam_retval != PAM_SUCCESS) { |
Kevin Steves | cccca27 | 2000-10-07 11:16:55 +0000 | [diff] [blame] | 170 | log("Cannot release PAM authentication[%d]: %.200s", |
| 171 | pam_retval, PAM_STRERROR(pamh, pam_retval)); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 172 | } |
| 173 | } |
| 174 | } |
| 175 | |
| 176 | /* Attempt password authentation using PAM */ |
| 177 | int auth_pam_password(struct passwd *pw, const char *password) |
| 178 | { |
| 179 | extern ServerOptions options; |
| 180 | int pam_retval; |
| 181 | |
Damien Miller | b848158 | 2000-12-03 11:51:51 +1100 | [diff] [blame] | 182 | pam_set_conv(&conv); |
| 183 | |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 184 | /* deny if no user. */ |
| 185 | if (pw == NULL) |
| 186 | return 0; |
| 187 | if (pw->pw_uid == 0 && options.permit_root_login == 2) |
| 188 | return 0; |
| 189 | if (*password == '\0' && options.permit_empty_passwd == 0) |
| 190 | return 0; |
| 191 | |
| 192 | pampasswd = password; |
| 193 | |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 194 | pamstate = INITIAL_LOGIN; |
Damien Miller | b848158 | 2000-12-03 11:51:51 +1100 | [diff] [blame] | 195 | pam_retval = do_pam_authenticate(0); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 196 | if (pam_retval == PAM_SUCCESS) { |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 197 | debug("PAM Password authentication accepted for user \"%.100s\"", |
| 198 | pw->pw_name); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 199 | return 1; |
| 200 | } else { |
Kevin Steves | cccca27 | 2000-10-07 11:16:55 +0000 | [diff] [blame] | 201 | debug("PAM Password authentication for \"%.100s\" failed[%d]: %s", |
| 202 | pw->pw_name, pam_retval, PAM_STRERROR(pamh, pam_retval)); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 203 | return 0; |
| 204 | } |
| 205 | } |
| 206 | |
| 207 | /* Do account management using PAM */ |
| 208 | int do_pam_account(char *username, char *remote_user) |
| 209 | { |
| 210 | int pam_retval; |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 211 | |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 212 | debug("PAM setting rhost to \"%.200s\"", get_canonical_hostname()); |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 213 | pam_retval = pam_set_item(pamh, PAM_RHOST, |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 214 | get_canonical_hostname()); |
| 215 | if (pam_retval != PAM_SUCCESS) { |
Kevin Steves | cccca27 | 2000-10-07 11:16:55 +0000 | [diff] [blame] | 216 | fatal("PAM set rhost failed[%d]: %.200s", |
| 217 | pam_retval, PAM_STRERROR(pamh, pam_retval)); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 218 | } |
| 219 | |
| 220 | if (remote_user != NULL) { |
| 221 | debug("PAM setting ruser to \"%.200s\"", remote_user); |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 222 | pam_retval = pam_set_item(pamh, PAM_RUSER, remote_user); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 223 | if (pam_retval != PAM_SUCCESS) { |
Kevin Steves | cccca27 | 2000-10-07 11:16:55 +0000 | [diff] [blame] | 224 | fatal("PAM set ruser failed[%d]: %.200s", |
| 225 | pam_retval, PAM_STRERROR(pamh, pam_retval)); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 226 | } |
| 227 | } |
| 228 | |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 229 | pam_retval = pam_acct_mgmt(pamh, 0); |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 230 | switch (pam_retval) { |
| 231 | case PAM_SUCCESS: |
| 232 | /* This is what we want */ |
| 233 | break; |
| 234 | case PAM_NEW_AUTHTOK_REQD: |
| 235 | pam_msg_cat(NEW_AUTHTOK_MSG); |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 236 | /* flag that password change is necessary */ |
| 237 | password_change_required = 1; |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 238 | break; |
| 239 | default: |
Kevin Steves | cccca27 | 2000-10-07 11:16:55 +0000 | [diff] [blame] | 240 | log("PAM rejected by account configuration[%d]: %.200s", |
| 241 | pam_retval, PAM_STRERROR(pamh, pam_retval)); |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 242 | return(0); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 243 | } |
| 244 | |
| 245 | return(1); |
| 246 | } |
| 247 | |
| 248 | /* Do PAM-specific session initialisation */ |
Damien Miller | 3e955e7 | 2000-01-27 10:55:38 +1100 | [diff] [blame] | 249 | void do_pam_session(char *username, const char *ttyname) |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 250 | { |
| 251 | int pam_retval; |
| 252 | |
| 253 | if (ttyname != NULL) { |
| 254 | debug("PAM setting tty to \"%.200s\"", ttyname); |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 255 | pam_retval = pam_set_item(pamh, PAM_TTY, ttyname); |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 256 | if (pam_retval != PAM_SUCCESS) { |
Kevin Steves | cccca27 | 2000-10-07 11:16:55 +0000 | [diff] [blame] | 257 | fatal("PAM set tty failed[%d]: %.200s", |
| 258 | pam_retval, PAM_STRERROR(pamh, pam_retval)); |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 259 | } |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 260 | } |
| 261 | |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 262 | pam_retval = pam_open_session(pamh, 0); |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 263 | if (pam_retval != PAM_SUCCESS) { |
Kevin Steves | cccca27 | 2000-10-07 11:16:55 +0000 | [diff] [blame] | 264 | fatal("PAM session setup failed[%d]: %.200s", |
| 265 | pam_retval, PAM_STRERROR(pamh, pam_retval)); |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 266 | } |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 267 | } |
| 268 | |
| 269 | /* Set PAM credentials */ |
Kevin Steves | 6beac8c | 2000-10-14 15:08:49 +0000 | [diff] [blame] | 270 | void do_pam_setcred(void) |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 271 | { |
| 272 | int pam_retval; |
| 273 | |
| 274 | debug("PAM establishing creds"); |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 275 | pam_retval = pam_setcred(pamh, PAM_ESTABLISH_CRED); |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 276 | if (pam_retval != PAM_SUCCESS) { |
Damien Miller | b848158 | 2000-12-03 11:51:51 +1100 | [diff] [blame] | 277 | if(was_authenticated) { |
| 278 | fatal("PAM setcred failed[%d]: %.200s", |
| 279 | pam_retval, PAM_STRERROR(pamh, pam_retval)); |
| 280 | } else { |
| 281 | debug("PAM setcred failed[%d]: %.200s", |
| 282 | pam_retval, PAM_STRERROR(pamh, pam_retval)); |
| 283 | } |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 284 | } |
| 285 | } |
| 286 | |
Kevin Steves | 092f2ef | 2000-10-14 13:36:13 +0000 | [diff] [blame] | 287 | /* accessor function for file scope static variable */ |
| 288 | int pam_password_change_required(void) |
| 289 | { |
| 290 | return password_change_required; |
| 291 | } |
| 292 | |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 293 | /* |
| 294 | * Have user change authentication token if pam_acct_mgmt() indicated |
| 295 | * it was expired. This needs to be called after an interactive |
| 296 | * session is established and the user's pty is connected to |
| 297 | * stdin/stout/stderr. |
| 298 | */ |
Kevin Steves | 6beac8c | 2000-10-14 15:08:49 +0000 | [diff] [blame] | 299 | void do_pam_chauthtok(void) |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 300 | { |
| 301 | int pam_retval; |
| 302 | |
| 303 | if (password_change_required) { |
| 304 | pamstate = OTHER; |
Kevin Steves | cccca27 | 2000-10-07 11:16:55 +0000 | [diff] [blame] | 305 | /* |
| 306 | * XXX: should we really loop forever? |
| 307 | */ |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 308 | do { |
| 309 | pam_retval = pam_chauthtok(pamh, PAM_CHANGE_EXPIRED_AUTHTOK); |
Kevin Steves | cccca27 | 2000-10-07 11:16:55 +0000 | [diff] [blame] | 310 | if (pam_retval != PAM_SUCCESS) { |
| 311 | log("PAM pam_chauthtok failed[%d]: %.200s", |
| 312 | pam_retval, PAM_STRERROR(pamh, pam_retval)); |
| 313 | } |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 314 | } while (pam_retval != PAM_SUCCESS); |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 315 | } |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 316 | } |
| 317 | |
| 318 | /* Cleanly shutdown PAM */ |
| 319 | void finish_pam(void) |
| 320 | { |
| 321 | pam_cleanup_proc(NULL); |
| 322 | fatal_remove_cleanup(&pam_cleanup_proc, NULL); |
| 323 | } |
| 324 | |
| 325 | /* Start PAM authentication for specified account */ |
| 326 | void start_pam(struct passwd *pw) |
| 327 | { |
| 328 | int pam_retval; |
| 329 | |
| 330 | debug("Starting up PAM with username \"%.200s\"", pw->pw_name); |
| 331 | |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 332 | pam_retval = pam_start(SSHD_PAM_SERVICE, pw->pw_name, &conv, &pamh); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 333 | |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 334 | if (pam_retval != PAM_SUCCESS) { |
Kevin Steves | cccca27 | 2000-10-07 11:16:55 +0000 | [diff] [blame] | 335 | fatal("PAM initialisation failed[%d]: %.200s", |
| 336 | pam_retval, PAM_STRERROR(pamh, pam_retval)); |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 337 | } |
Damien Miller | c19fd5f | 2000-06-22 21:44:54 +1000 | [diff] [blame] | 338 | |
Damien Miller | 4e99720 | 2000-07-09 21:21:52 +1000 | [diff] [blame] | 339 | #ifdef PAM_TTY_KLUDGE |
Damien Miller | c19fd5f | 2000-06-22 21:44:54 +1000 | [diff] [blame] | 340 | /* |
| 341 | * Some PAM modules (e.g. pam_time) require a TTY to operate, |
| 342 | * and will fail in various stupid ways if they don't get one. |
| 343 | * sshd doesn't set the tty until too late in the auth process and may |
| 344 | * not even need one (for tty-less connections) |
| 345 | * Kludge: Set a fake PAM_TTY |
| 346 | */ |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 347 | pam_retval = pam_set_item(pamh, PAM_TTY, "ssh"); |
Damien Miller | 7b22d65 | 2000-06-18 14:07:04 +1000 | [diff] [blame] | 348 | if (pam_retval != PAM_SUCCESS) { |
Kevin Steves | cccca27 | 2000-10-07 11:16:55 +0000 | [diff] [blame] | 349 | fatal("PAM set tty failed[%d]: %.200s", |
| 350 | pam_retval, PAM_STRERROR(pamh, pam_retval)); |
Damien Miller | 7b22d65 | 2000-06-18 14:07:04 +1000 | [diff] [blame] | 351 | } |
Damien Miller | 4e99720 | 2000-07-09 21:21:52 +1000 | [diff] [blame] | 352 | #endif /* PAM_TTY_KLUDGE */ |
Damien Miller | 7b22d65 | 2000-06-18 14:07:04 +1000 | [diff] [blame] | 353 | |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 354 | fatal_add_cleanup(&pam_cleanup_proc, NULL); |
| 355 | } |
| 356 | |
| 357 | /* Return list of PAM enviornment strings */ |
| 358 | char **fetch_pam_environment(void) |
| 359 | { |
Damien Miller | 1bead33 | 2000-04-30 00:47:29 +1000 | [diff] [blame] | 360 | #ifdef HAVE_PAM_GETENVLIST |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 361 | return(pam_getenvlist(pamh)); |
Damien Miller | 1bead33 | 2000-04-30 00:47:29 +1000 | [diff] [blame] | 362 | #else /* HAVE_PAM_GETENVLIST */ |
| 363 | return(NULL); |
| 364 | #endif /* HAVE_PAM_GETENVLIST */ |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 365 | } |
| 366 | |
| 367 | /* Print any messages that have been generated during authentication */ |
| 368 | /* or account checking to stderr */ |
| 369 | void print_pam_messages(void) |
| 370 | { |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 371 | if (pam_msg != NULL) |
Damien Miller | f9b625c | 2000-07-09 22:42:32 +1000 | [diff] [blame] | 372 | fputs(pam_msg, stderr); |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 373 | } |
| 374 | |
| 375 | /* Append a message to the PAM message buffer */ |
| 376 | void pam_msg_cat(const char *msg) |
| 377 | { |
| 378 | char *p; |
| 379 | size_t new_msg_len; |
| 380 | size_t pam_msg_len; |
| 381 | |
| 382 | new_msg_len = strlen(msg); |
| 383 | |
| 384 | if (pam_msg) { |
| 385 | pam_msg_len = strlen(pam_msg); |
| 386 | pam_msg = xrealloc(pam_msg, new_msg_len + pam_msg_len + 2); |
| 387 | p = pam_msg + pam_msg_len; |
| 388 | } else { |
| 389 | pam_msg = p = xmalloc(new_msg_len + 2); |
| 390 | } |
| 391 | |
| 392 | memcpy(p, msg, new_msg_len); |
| 393 | p[new_msg_len] = '\n'; |
| 394 | p[new_msg_len + 1] = '\0'; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 395 | } |
| 396 | |
| 397 | #endif /* USE_PAM */ |