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" |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 31 | #include "auth-pam.h" |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 32 | #include "servconf.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 33 | #include "canohost.h" |
| 34 | #include "readpass.h" |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 35 | |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 36 | RCSID("$Id: auth-pam.c,v 1.25 2001/02/07 01:58:34 djm Exp $"); |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 37 | |
| 38 | #define NEW_AUTHTOK_MSG \ |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 39 | "Warning: Your password has expired, please change it now" |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 40 | |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 41 | static int do_pam_conversation(int num_msg, const struct pam_message **msg, |
| 42 | struct pam_response **resp, void *appdata_ptr); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 43 | |
| 44 | /* module-local variables */ |
| 45 | static struct pam_conv conv = { |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 46 | do_pam_conversation, |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 47 | NULL |
| 48 | }; |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 49 | static char *pam_msg = NULL; |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 50 | static pam_handle_t *pamh = NULL; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 51 | static const char *pampasswd = NULL; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 52 | |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 53 | /* states for do_pam_conversation() */ |
Damien Miller | b848158 | 2000-12-03 11:51:51 +1100 | [diff] [blame] | 54 | enum { INITIAL_LOGIN, OTHER } pamstate = INITIAL_LOGIN; |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 55 | /* remember whether pam_acct_mgmt() returned PAM_NEWAUTHTOK_REQD */ |
| 56 | static int password_change_required = 0; |
Damien Miller | b848158 | 2000-12-03 11:51:51 +1100 | [diff] [blame] | 57 | /* remember whether the last pam_authenticate() succeeded or not */ |
| 58 | static int was_authenticated = 0; |
| 59 | |
| 60 | /* accessor which allows us to switch conversation structs according to |
| 61 | * the authentication method being used */ |
| 62 | void pam_set_conv(struct pam_conv *conv) |
| 63 | { |
| 64 | pam_set_item(pamh, PAM_CONV, conv); |
| 65 | } |
| 66 | |
| 67 | /* start an authentication run */ |
| 68 | int do_pam_authenticate(int flags) |
| 69 | { |
| 70 | int retval = pam_authenticate(pamh, flags); |
| 71 | was_authenticated = (retval == PAM_SUCCESS); |
| 72 | return retval; |
| 73 | } |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 74 | |
| 75 | /* |
| 76 | * PAM conversation function. |
| 77 | * There are two states this can run in. |
| 78 | * |
| 79 | * INITIAL_LOGIN mode simply feeds the password from the client into |
| 80 | * PAM in response to PAM_PROMPT_ECHO_OFF, and collects output |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 81 | * messages with into pam_msg. This is used during initial |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 82 | * authentication to bypass the normal PAM password prompt. |
| 83 | * |
| 84 | * OTHER mode handles PAM_PROMPT_ECHO_OFF with read_passphrase(prompt, 1) |
| 85 | * and outputs messages to stderr. This mode is used if pam_chauthtok() |
| 86 | * is called to update expired passwords. |
| 87 | */ |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 88 | 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] | 89 | struct pam_response **resp, void *appdata_ptr) |
| 90 | { |
| 91 | struct pam_response *reply; |
| 92 | int count; |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 93 | char buf[1024]; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 94 | |
| 95 | /* PAM will free this later */ |
| 96 | reply = malloc(num_msg * sizeof(*reply)); |
| 97 | if (reply == NULL) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 98 | return PAM_CONV_ERR; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 99 | |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 100 | for (count = 0; count < num_msg; count++) { |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 101 | if (pamstate == INITIAL_LOGIN) { |
| 102 | /* |
| 103 | * We can't use stdio yet, queue messages for |
| 104 | * printing later |
| 105 | */ |
| 106 | switch(PAM_MSG_MEMBER(msg, count, msg_style)) { |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 107 | case PAM_PROMPT_ECHO_ON: |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 108 | free(reply); |
| 109 | return PAM_CONV_ERR; |
| 110 | case PAM_PROMPT_ECHO_OFF: |
| 111 | if (pampasswd == NULL) { |
Damien Miller | 60819b4 | 2000-10-14 11:16:12 +1100 | [diff] [blame] | 112 | free(reply); |
| 113 | return PAM_CONV_ERR; |
Damien Miller | 60819b4 | 2000-10-14 11:16:12 +1100 | [diff] [blame] | 114 | } |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 115 | reply[count].resp = xstrdup(pampasswd); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 116 | reply[count].resp_retcode = PAM_SUCCESS; |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 117 | break; |
| 118 | case PAM_ERROR_MSG: |
| 119 | case PAM_TEXT_INFO: |
| 120 | if ((*msg)[count].msg != NULL) { |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 121 | message_cat(&pam_msg, |
| 122 | PAM_MSG_MEMBER(msg, count, msg)); |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 123 | } |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 124 | reply[count].resp = xstrdup(""); |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 125 | reply[count].resp_retcode = PAM_SUCCESS; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 126 | break; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 127 | default: |
| 128 | free(reply); |
| 129 | return PAM_CONV_ERR; |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 130 | } |
| 131 | } else { |
| 132 | /* |
| 133 | * stdio is connected, so interact directly |
| 134 | */ |
| 135 | switch(PAM_MSG_MEMBER(msg, count, msg_style)) { |
| 136 | case PAM_PROMPT_ECHO_ON: |
| 137 | fputs(PAM_MSG_MEMBER(msg, count, msg), stderr); |
| 138 | fgets(buf, sizeof(buf), stdin); |
| 139 | reply[count].resp = xstrdup(buf); |
| 140 | reply[count].resp_retcode = PAM_SUCCESS; |
| 141 | break; |
| 142 | case PAM_PROMPT_ECHO_OFF: |
| 143 | reply[count].resp = xstrdup( |
| 144 | read_passphrase(PAM_MSG_MEMBER(msg, count, |
| 145 | msg), 1)); |
| 146 | reply[count].resp_retcode = PAM_SUCCESS; |
| 147 | break; |
| 148 | case PAM_ERROR_MSG: |
| 149 | case PAM_TEXT_INFO: |
| 150 | if ((*msg)[count].msg != NULL) |
| 151 | fprintf(stderr, "%s\n", |
| 152 | PAM_MSG_MEMBER(msg, count, msg)); |
| 153 | reply[count].resp = xstrdup(""); |
| 154 | reply[count].resp_retcode = PAM_SUCCESS; |
| 155 | break; |
| 156 | default: |
| 157 | free(reply); |
| 158 | return PAM_CONV_ERR; |
| 159 | } |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 160 | } |
| 161 | } |
| 162 | |
| 163 | *resp = reply; |
| 164 | |
| 165 | return PAM_SUCCESS; |
| 166 | } |
| 167 | |
| 168 | /* Called at exit to cleanly shutdown PAM */ |
| 169 | void pam_cleanup_proc(void *context) |
| 170 | { |
| 171 | int pam_retval; |
| 172 | |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 173 | if (pamh) { |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 174 | pam_retval = pam_close_session(pamh, 0); |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 175 | if (pam_retval != PAM_SUCCESS) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 176 | log("Cannot close PAM session[%d]: %.200s", |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 177 | pam_retval, PAM_STRERROR(pamh, pam_retval)); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 178 | |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 179 | pam_retval = pam_setcred(pamh, PAM_DELETE_CRED); |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 180 | if (pam_retval != PAM_SUCCESS) |
| 181 | debug("Cannot delete credentials[%d]: %.200s", |
| 182 | pam_retval, PAM_STRERROR(pamh, pam_retval)); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 183 | |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 184 | pam_retval = pam_end(pamh, pam_retval); |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 185 | if (pam_retval != PAM_SUCCESS) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 186 | log("Cannot release PAM authentication[%d]: %.200s", |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 187 | pam_retval, PAM_STRERROR(pamh, pam_retval)); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 188 | } |
| 189 | } |
| 190 | |
| 191 | /* Attempt password authentation using PAM */ |
| 192 | int auth_pam_password(struct passwd *pw, const char *password) |
| 193 | { |
| 194 | extern ServerOptions options; |
| 195 | int pam_retval; |
| 196 | |
Damien Miller | b848158 | 2000-12-03 11:51:51 +1100 | [diff] [blame] | 197 | pam_set_conv(&conv); |
| 198 | |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 199 | /* deny if no user. */ |
| 200 | if (pw == NULL) |
| 201 | return 0; |
| 202 | if (pw->pw_uid == 0 && options.permit_root_login == 2) |
| 203 | return 0; |
| 204 | if (*password == '\0' && options.permit_empty_passwd == 0) |
| 205 | return 0; |
| 206 | |
| 207 | pampasswd = password; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 208 | |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 209 | pamstate = INITIAL_LOGIN; |
Damien Miller | b848158 | 2000-12-03 11:51:51 +1100 | [diff] [blame] | 210 | pam_retval = do_pam_authenticate(0); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 211 | if (pam_retval == PAM_SUCCESS) { |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 212 | debug("PAM Password authentication accepted for " |
| 213 | "user \"%.100s\"", pw->pw_name); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 214 | return 1; |
| 215 | } else { |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 216 | debug("PAM Password authentication for \"%.100s\" " |
| 217 | "failed[%d]: %s", pw->pw_name, pam_retval, |
| 218 | PAM_STRERROR(pamh, pam_retval)); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 219 | return 0; |
| 220 | } |
| 221 | } |
| 222 | |
| 223 | /* Do account management using PAM */ |
| 224 | int do_pam_account(char *username, char *remote_user) |
| 225 | { |
| 226 | int pam_retval; |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 227 | extern ServerOptions options; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 228 | |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 229 | pam_set_conv(&conv); |
| 230 | |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 231 | debug("PAM setting rhost to \"%.200s\"", |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 232 | get_canonical_hostname(options.reverse_mapping_check)); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 233 | pam_retval = pam_set_item(pamh, PAM_RHOST, |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 234 | get_canonical_hostname(options.reverse_mapping_check)); |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 235 | if (pam_retval != PAM_SUCCESS) |
| 236 | fatal("PAM set rhost failed[%d]: %.200s", pam_retval, |
| 237 | PAM_STRERROR(pamh, pam_retval)); |
| 238 | if (remote_user) { |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 239 | debug("PAM setting ruser to \"%.200s\"", remote_user); |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 240 | pam_retval = pam_set_item(pamh, PAM_RUSER, remote_user); |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 241 | if (pam_retval != PAM_SUCCESS) |
| 242 | fatal("PAM set ruser failed[%d]: %.200s", pam_retval, |
| 243 | PAM_STRERROR(pamh, pam_retval)); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 244 | } |
| 245 | |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 246 | pam_retval = pam_acct_mgmt(pamh, 0); |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 247 | switch (pam_retval) { |
| 248 | case PAM_SUCCESS: |
| 249 | /* This is what we want */ |
| 250 | break; |
| 251 | case PAM_NEW_AUTHTOK_REQD: |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 252 | message_cat(&pam_msg, NEW_AUTHTOK_MSG); |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 253 | /* flag that password change is necessary */ |
| 254 | password_change_required = 1; |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 255 | break; |
| 256 | default: |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 257 | log("PAM rejected by account configuration[%d]: " |
| 258 | "%.200s", pam_retval, PAM_STRERROR(pamh, |
| 259 | pam_retval)); |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 260 | return(0); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 261 | } |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 262 | |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 263 | return(1); |
| 264 | } |
| 265 | |
| 266 | /* Do PAM-specific session initialisation */ |
Damien Miller | 3e955e7 | 2000-01-27 10:55:38 +1100 | [diff] [blame] | 267 | void do_pam_session(char *username, const char *ttyname) |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 268 | { |
| 269 | int pam_retval; |
| 270 | |
| 271 | if (ttyname != NULL) { |
| 272 | debug("PAM setting tty to \"%.200s\"", ttyname); |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 273 | pam_retval = pam_set_item(pamh, PAM_TTY, ttyname); |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 274 | if (pam_retval != PAM_SUCCESS) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 275 | fatal("PAM set tty failed[%d]: %.200s", |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 276 | pam_retval, PAM_STRERROR(pamh, pam_retval)); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 277 | } |
| 278 | |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 279 | pam_retval = pam_open_session(pamh, 0); |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 280 | if (pam_retval != PAM_SUCCESS) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 281 | fatal("PAM session setup failed[%d]: %.200s", |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 282 | pam_retval, PAM_STRERROR(pamh, pam_retval)); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 283 | } |
| 284 | |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 285 | /* Set PAM credentials */ |
Kevin Steves | 6beac8c | 2000-10-14 15:08:49 +0000 | [diff] [blame] | 286 | void do_pam_setcred(void) |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 287 | { |
| 288 | int pam_retval; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 289 | |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 290 | debug("PAM establishing creds"); |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 291 | pam_retval = pam_setcred(pamh, PAM_ESTABLISH_CRED); |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 292 | if (pam_retval != PAM_SUCCESS) { |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 293 | if (was_authenticated) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 294 | fatal("PAM setcred failed[%d]: %.200s", |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 295 | pam_retval, PAM_STRERROR(pamh, pam_retval)); |
| 296 | else |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 297 | debug("PAM setcred failed[%d]: %.200s", |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 298 | pam_retval, PAM_STRERROR(pamh, pam_retval)); |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 299 | } |
| 300 | } |
| 301 | |
Kevin Steves | 092f2ef | 2000-10-14 13:36:13 +0000 | [diff] [blame] | 302 | /* accessor function for file scope static variable */ |
| 303 | int pam_password_change_required(void) |
| 304 | { |
| 305 | return password_change_required; |
| 306 | } |
| 307 | |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 308 | /* |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 309 | * Have user change authentication token if pam_acct_mgmt() indicated |
| 310 | * it was expired. This needs to be called after an interactive |
| 311 | * session is established and the user's pty is connected to |
| 312 | * stdin/stout/stderr. |
| 313 | */ |
Kevin Steves | 6beac8c | 2000-10-14 15:08:49 +0000 | [diff] [blame] | 314 | void do_pam_chauthtok(void) |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 315 | { |
| 316 | int pam_retval; |
| 317 | |
| 318 | if (password_change_required) { |
| 319 | pamstate = OTHER; |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 320 | /* XXX: should we really loop forever? */ |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 321 | do { |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 322 | pam_retval = pam_chauthtok(pamh, |
| 323 | PAM_CHANGE_EXPIRED_AUTHTOK); |
| 324 | if (pam_retval != PAM_SUCCESS) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 325 | log("PAM pam_chauthtok failed[%d]: %.200s", |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 326 | pam_retval, PAM_STRERROR(pamh, pam_retval)); |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 327 | } while (pam_retval != PAM_SUCCESS); |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 328 | } |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 329 | } |
| 330 | |
| 331 | /* Cleanly shutdown PAM */ |
| 332 | void finish_pam(void) |
| 333 | { |
| 334 | pam_cleanup_proc(NULL); |
| 335 | fatal_remove_cleanup(&pam_cleanup_proc, NULL); |
| 336 | } |
| 337 | |
| 338 | /* Start PAM authentication for specified account */ |
Damien Miller | 22e22bf | 2001-01-19 15:46:38 +1100 | [diff] [blame] | 339 | void start_pam(const char *user) |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 340 | { |
| 341 | int pam_retval; |
| 342 | |
Damien Miller | 22e22bf | 2001-01-19 15:46:38 +1100 | [diff] [blame] | 343 | debug("Starting up PAM with username \"%.200s\"", user); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 344 | |
Damien Miller | 22e22bf | 2001-01-19 15:46:38 +1100 | [diff] [blame] | 345 | pam_retval = pam_start(SSHD_PAM_SERVICE, user, &conv, &pamh); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 346 | |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 347 | if (pam_retval != PAM_SUCCESS) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 348 | fatal("PAM initialisation failed[%d]: %.200s", |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 349 | pam_retval, PAM_STRERROR(pamh, pam_retval)); |
Damien Miller | 4e99720 | 2000-07-09 21:21:52 +1000 | [diff] [blame] | 350 | #ifdef PAM_TTY_KLUDGE |
Damien Miller | c19fd5f | 2000-06-22 21:44:54 +1000 | [diff] [blame] | 351 | /* |
| 352 | * Some PAM modules (e.g. pam_time) require a TTY to operate, |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 353 | * 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] | 354 | * sshd doesn't set the tty until too late in the auth process and may |
| 355 | * not even need one (for tty-less connections) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 356 | * Kludge: Set a fake PAM_TTY |
Damien Miller | c19fd5f | 2000-06-22 21:44:54 +1000 | [diff] [blame] | 357 | */ |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 358 | pam_retval = pam_set_item(pamh, PAM_TTY, "ssh"); |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 359 | if (pam_retval != PAM_SUCCESS) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 360 | fatal("PAM set tty failed[%d]: %.200s", |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 361 | pam_retval, PAM_STRERROR(pamh, pam_retval)); |
Damien Miller | 4e99720 | 2000-07-09 21:21:52 +1000 | [diff] [blame] | 362 | #endif /* PAM_TTY_KLUDGE */ |
Damien Miller | 7b22d65 | 2000-06-18 14:07:04 +1000 | [diff] [blame] | 363 | |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 364 | fatal_add_cleanup(&pam_cleanup_proc, NULL); |
| 365 | } |
| 366 | |
| 367 | /* Return list of PAM enviornment strings */ |
| 368 | char **fetch_pam_environment(void) |
| 369 | { |
Damien Miller | 1bead33 | 2000-04-30 00:47:29 +1000 | [diff] [blame] | 370 | #ifdef HAVE_PAM_GETENVLIST |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 371 | return(pam_getenvlist(pamh)); |
Damien Miller | 1bead33 | 2000-04-30 00:47:29 +1000 | [diff] [blame] | 372 | #else /* HAVE_PAM_GETENVLIST */ |
| 373 | return(NULL); |
| 374 | #endif /* HAVE_PAM_GETENVLIST */ |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 375 | } |
| 376 | |
| 377 | /* Print any messages that have been generated during authentication */ |
| 378 | /* or account checking to stderr */ |
| 379 | void print_pam_messages(void) |
| 380 | { |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 381 | if (pam_msg != NULL) |
Damien Miller | f9b625c | 2000-07-09 22:42:32 +1000 | [diff] [blame] | 382 | fputs(pam_msg, stderr); |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 383 | } |
| 384 | |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 385 | /* Append a message to buffer */ |
| 386 | void message_cat(char **p, const char *a) |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 387 | { |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 388 | char *cp; |
| 389 | size_t new_len; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 390 | |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 391 | new_len = strlen(a); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 392 | |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 393 | if (*p) { |
| 394 | size_t len = strlen(*p); |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 395 | |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 396 | *p = xrealloc(*p, new_len + len + 2); |
| 397 | cp = *p + len; |
| 398 | } else |
| 399 | *p = cp = xmalloc(new_len + 2); |
| 400 | |
| 401 | memcpy(cp, a, new_len); |
| 402 | cp[new_len] = '\n'; |
| 403 | cp[new_len + 1] = '\0'; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 404 | } |
| 405 | |
| 406 | #endif /* USE_PAM */ |