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 | |
Kevin Steves | 85ecbe7 | 2001-04-20 17:43:47 +0000 | [diff] [blame] | 36 | extern char *__progname; |
| 37 | |
Kevin Steves | de77b46 | 2001-11-09 20:22:16 +0000 | [diff] [blame] | 38 | RCSID("$Id: auth-pam.c,v 1.41 2001/11/09 20:22:17 stevesk Exp $"); |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 39 | |
| 40 | #define NEW_AUTHTOK_MSG \ |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 41 | "Warning: Your password has expired, please change it now" |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 42 | |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 43 | static int do_pam_conversation(int num_msg, const struct pam_message **msg, |
| 44 | struct pam_response **resp, void *appdata_ptr); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 45 | |
| 46 | /* module-local variables */ |
| 47 | static struct pam_conv conv = { |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 48 | do_pam_conversation, |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 49 | NULL |
| 50 | }; |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 51 | static char *__pam_msg = NULL; |
| 52 | static pam_handle_t *__pamh = NULL; |
| 53 | static const char *__pampasswd = NULL; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 54 | |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 55 | /* states for do_pam_conversation() */ |
Damien Miller | b848158 | 2000-12-03 11:51:51 +1100 | [diff] [blame] | 56 | enum { INITIAL_LOGIN, OTHER } pamstate = INITIAL_LOGIN; |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 57 | /* remember whether pam_acct_mgmt() returned PAM_NEWAUTHTOK_REQD */ |
| 58 | static int password_change_required = 0; |
Damien Miller | b848158 | 2000-12-03 11:51:51 +1100 | [diff] [blame] | 59 | /* remember whether the last pam_authenticate() succeeded or not */ |
| 60 | static int was_authenticated = 0; |
| 61 | |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 62 | /* Remember what has been initialised */ |
| 63 | static int session_opened = 0; |
| 64 | static int creds_set = 0; |
| 65 | |
Damien Miller | b848158 | 2000-12-03 11:51:51 +1100 | [diff] [blame] | 66 | /* accessor which allows us to switch conversation structs according to |
| 67 | * the authentication method being used */ |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 68 | void do_pam_set_conv(struct pam_conv *conv) |
Damien Miller | b848158 | 2000-12-03 11:51:51 +1100 | [diff] [blame] | 69 | { |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 70 | pam_set_item(__pamh, PAM_CONV, conv); |
Damien Miller | b848158 | 2000-12-03 11:51:51 +1100 | [diff] [blame] | 71 | } |
| 72 | |
| 73 | /* start an authentication run */ |
| 74 | int do_pam_authenticate(int flags) |
| 75 | { |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 76 | int retval = pam_authenticate(__pamh, flags); |
Damien Miller | b848158 | 2000-12-03 11:51:51 +1100 | [diff] [blame] | 77 | was_authenticated = (retval == PAM_SUCCESS); |
| 78 | return retval; |
| 79 | } |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 80 | |
| 81 | /* |
| 82 | * PAM conversation function. |
| 83 | * There are two states this can run in. |
| 84 | * |
| 85 | * INITIAL_LOGIN mode simply feeds the password from the client into |
| 86 | * PAM in response to PAM_PROMPT_ECHO_OFF, and collects output |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 87 | * messages with into __pam_msg. This is used during initial |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 88 | * authentication to bypass the normal PAM password prompt. |
| 89 | * |
Damien Miller | 0925648 | 2001-10-28 22:36:55 +1100 | [diff] [blame] | 90 | * OTHER mode handles PAM_PROMPT_ECHO_OFF with read_passphrase() |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 91 | * and outputs messages to stderr. This mode is used if pam_chauthtok() |
| 92 | * is called to update expired passwords. |
| 93 | */ |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 94 | 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] | 95 | struct pam_response **resp, void *appdata_ptr) |
| 96 | { |
| 97 | struct pam_response *reply; |
| 98 | int count; |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 99 | char buf[1024]; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 100 | |
| 101 | /* PAM will free this later */ |
| 102 | reply = malloc(num_msg * sizeof(*reply)); |
| 103 | if (reply == NULL) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 104 | return PAM_CONV_ERR; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 105 | |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 106 | for (count = 0; count < num_msg; count++) { |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 107 | if (pamstate == INITIAL_LOGIN) { |
| 108 | /* |
| 109 | * We can't use stdio yet, queue messages for |
| 110 | * printing later |
| 111 | */ |
| 112 | switch(PAM_MSG_MEMBER(msg, count, msg_style)) { |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 113 | case PAM_PROMPT_ECHO_ON: |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 114 | free(reply); |
| 115 | return PAM_CONV_ERR; |
| 116 | case PAM_PROMPT_ECHO_OFF: |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 117 | if (__pampasswd == NULL) { |
Damien Miller | 60819b4 | 2000-10-14 11:16:12 +1100 | [diff] [blame] | 118 | free(reply); |
| 119 | return PAM_CONV_ERR; |
Damien Miller | 60819b4 | 2000-10-14 11:16:12 +1100 | [diff] [blame] | 120 | } |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 121 | reply[count].resp = xstrdup(__pampasswd); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 122 | reply[count].resp_retcode = PAM_SUCCESS; |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 123 | break; |
| 124 | case PAM_ERROR_MSG: |
| 125 | case PAM_TEXT_INFO: |
| 126 | if ((*msg)[count].msg != NULL) { |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 127 | message_cat(&__pam_msg, |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 128 | PAM_MSG_MEMBER(msg, count, msg)); |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 129 | } |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 130 | reply[count].resp = xstrdup(""); |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 131 | reply[count].resp_retcode = PAM_SUCCESS; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 132 | break; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 133 | default: |
| 134 | free(reply); |
| 135 | return PAM_CONV_ERR; |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 136 | } |
| 137 | } else { |
| 138 | /* |
| 139 | * stdio is connected, so interact directly |
| 140 | */ |
| 141 | switch(PAM_MSG_MEMBER(msg, count, msg_style)) { |
| 142 | case PAM_PROMPT_ECHO_ON: |
| 143 | fputs(PAM_MSG_MEMBER(msg, count, msg), stderr); |
| 144 | fgets(buf, sizeof(buf), stdin); |
| 145 | reply[count].resp = xstrdup(buf); |
| 146 | reply[count].resp_retcode = PAM_SUCCESS; |
| 147 | break; |
| 148 | case PAM_PROMPT_ECHO_OFF: |
Damien Miller | 0925648 | 2001-10-28 22:36:55 +1100 | [diff] [blame] | 149 | reply[count].resp = |
Kevin Steves | fe2f4a1 | 2001-10-28 17:32:38 +0000 | [diff] [blame] | 150 | read_passphrase(PAM_MSG_MEMBER(msg, count, |
| 151 | msg), RP_ALLOW_STDIN); |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 152 | reply[count].resp_retcode = PAM_SUCCESS; |
| 153 | break; |
| 154 | case PAM_ERROR_MSG: |
| 155 | case PAM_TEXT_INFO: |
| 156 | if ((*msg)[count].msg != NULL) |
| 157 | fprintf(stderr, "%s\n", |
| 158 | PAM_MSG_MEMBER(msg, count, msg)); |
| 159 | reply[count].resp = xstrdup(""); |
| 160 | reply[count].resp_retcode = PAM_SUCCESS; |
| 161 | break; |
| 162 | default: |
| 163 | free(reply); |
| 164 | return PAM_CONV_ERR; |
| 165 | } |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 166 | } |
| 167 | } |
| 168 | |
| 169 | *resp = reply; |
| 170 | |
| 171 | return PAM_SUCCESS; |
| 172 | } |
| 173 | |
| 174 | /* Called at exit to cleanly shutdown PAM */ |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 175 | void do_pam_cleanup_proc(void *context) |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 176 | { |
Damien Miller | 2e9adb2 | 2001-03-21 12:16:24 +1100 | [diff] [blame] | 177 | int pam_retval = PAM_SUCCESS; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 178 | |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 179 | if (__pamh && session_opened) { |
| 180 | pam_retval = pam_close_session(__pamh, 0); |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 181 | if (pam_retval != PAM_SUCCESS) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 182 | log("Cannot close PAM session[%d]: %.200s", |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 183 | pam_retval, PAM_STRERROR(__pamh, pam_retval)); |
Damien Miller | 3dfeee4 | 2001-02-14 00:43:55 +1100 | [diff] [blame] | 184 | } |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 185 | |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 186 | if (__pamh && creds_set) { |
| 187 | pam_retval = pam_setcred(__pamh, PAM_DELETE_CRED); |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 188 | if (pam_retval != PAM_SUCCESS) |
| 189 | debug("Cannot delete credentials[%d]: %.200s", |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 190 | pam_retval, PAM_STRERROR(__pamh, pam_retval)); |
Damien Miller | 3dfeee4 | 2001-02-14 00:43:55 +1100 | [diff] [blame] | 191 | } |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 192 | |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 193 | if (__pamh) { |
| 194 | pam_retval = pam_end(__pamh, pam_retval); |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 195 | if (pam_retval != PAM_SUCCESS) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 196 | log("Cannot release PAM authentication[%d]: %.200s", |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 197 | pam_retval, PAM_STRERROR(__pamh, pam_retval)); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 198 | } |
| 199 | } |
| 200 | |
| 201 | /* Attempt password authentation using PAM */ |
| 202 | int auth_pam_password(struct passwd *pw, const char *password) |
| 203 | { |
| 204 | extern ServerOptions options; |
| 205 | int pam_retval; |
| 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 | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 250 | switch (pam_retval) { |
| 251 | case PAM_SUCCESS: |
| 252 | /* This is what we want */ |
| 253 | break; |
| 254 | case PAM_NEW_AUTHTOK_REQD: |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 255 | message_cat(&__pam_msg, NEW_AUTHTOK_MSG); |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 256 | /* flag that password change is necessary */ |
| 257 | password_change_required = 1; |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 258 | break; |
| 259 | default: |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 260 | log("PAM rejected by account configuration[%d]: " |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 261 | "%.200s", pam_retval, PAM_STRERROR(__pamh, |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 262 | pam_retval)); |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 263 | return(0); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 264 | } |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 265 | |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 266 | return(1); |
| 267 | } |
| 268 | |
| 269 | /* Do PAM-specific session initialisation */ |
Damien Miller | 3e955e7 | 2000-01-27 10:55:38 +1100 | [diff] [blame] | 270 | void do_pam_session(char *username, const char *ttyname) |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 271 | { |
| 272 | int pam_retval; |
| 273 | |
Damien Miller | 882c2ee | 2001-03-01 09:18:57 +1100 | [diff] [blame] | 274 | do_pam_set_conv(&conv); |
| 275 | |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 276 | if (ttyname != NULL) { |
| 277 | debug("PAM setting tty to \"%.200s\"", ttyname); |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 278 | pam_retval = pam_set_item(__pamh, PAM_TTY, ttyname); |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 279 | if (pam_retval != PAM_SUCCESS) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 280 | fatal("PAM set tty failed[%d]: %.200s", |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 281 | pam_retval, PAM_STRERROR(__pamh, pam_retval)); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 282 | } |
| 283 | |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 284 | pam_retval = pam_open_session(__pamh, 0); |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 285 | if (pam_retval != PAM_SUCCESS) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 286 | fatal("PAM session setup failed[%d]: %.200s", |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 287 | pam_retval, PAM_STRERROR(__pamh, pam_retval)); |
Damien Miller | 31a501d | 2001-02-27 09:20:48 +1100 | [diff] [blame] | 288 | |
Damien Miller | 3dfeee4 | 2001-02-14 00:43:55 +1100 | [diff] [blame] | 289 | session_opened = 1; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 290 | } |
| 291 | |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 292 | /* Set PAM credentials */ |
Damien Miller | f9e9300 | 2001-03-27 16:12:24 +1000 | [diff] [blame] | 293 | void do_pam_setcred(int init) |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 294 | { |
| 295 | int pam_retval; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 296 | |
Damien Miller | 882c2ee | 2001-03-01 09:18:57 +1100 | [diff] [blame] | 297 | do_pam_set_conv(&conv); |
| 298 | |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 299 | debug("PAM establishing creds"); |
Damien Miller | f9e9300 | 2001-03-27 16:12:24 +1000 | [diff] [blame] | 300 | pam_retval = pam_setcred(__pamh, |
| 301 | init ? PAM_ESTABLISH_CRED : PAM_REINITIALIZE_CRED); |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 302 | if (pam_retval != PAM_SUCCESS) { |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 303 | if (was_authenticated) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 304 | fatal("PAM setcred failed[%d]: %.200s", |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 305 | pam_retval, PAM_STRERROR(__pamh, pam_retval)); |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 306 | else |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 307 | debug("PAM setcred failed[%d]: %.200s", |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 308 | pam_retval, PAM_STRERROR(__pamh, pam_retval)); |
Damien Miller | 3dfeee4 | 2001-02-14 00:43:55 +1100 | [diff] [blame] | 309 | } else |
| 310 | creds_set = 1; |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 311 | } |
| 312 | |
Kevin Steves | 092f2ef | 2000-10-14 13:36:13 +0000 | [diff] [blame] | 313 | /* accessor function for file scope static variable */ |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 314 | int is_pam_password_change_required(void) |
Kevin Steves | 092f2ef | 2000-10-14 13:36:13 +0000 | [diff] [blame] | 315 | { |
| 316 | return password_change_required; |
| 317 | } |
| 318 | |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 319 | /* |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 320 | * Have user change authentication token if pam_acct_mgmt() indicated |
| 321 | * it was expired. This needs to be called after an interactive |
| 322 | * session is established and the user's pty is connected to |
| 323 | * stdin/stout/stderr. |
| 324 | */ |
Kevin Steves | 6beac8c | 2000-10-14 15:08:49 +0000 | [diff] [blame] | 325 | void do_pam_chauthtok(void) |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 326 | { |
| 327 | int pam_retval; |
| 328 | |
Damien Miller | 882c2ee | 2001-03-01 09:18:57 +1100 | [diff] [blame] | 329 | do_pam_set_conv(&conv); |
| 330 | |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 331 | if (password_change_required) { |
| 332 | pamstate = OTHER; |
Damien Miller | ec7e1b1 | 2001-03-21 13:01:35 +1100 | [diff] [blame] | 333 | pam_retval = pam_chauthtok(__pamh, PAM_CHANGE_EXPIRED_AUTHTOK); |
| 334 | if (pam_retval != PAM_SUCCESS) |
| 335 | fatal("PAM pam_chauthtok 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 | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 338 | } |
| 339 | |
| 340 | /* Cleanly shutdown PAM */ |
| 341 | void finish_pam(void) |
| 342 | { |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 343 | do_pam_cleanup_proc(NULL); |
| 344 | fatal_remove_cleanup(&do_pam_cleanup_proc, NULL); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 345 | } |
| 346 | |
| 347 | /* Start PAM authentication for specified account */ |
Damien Miller | 22e22bf | 2001-01-19 15:46:38 +1100 | [diff] [blame] | 348 | void start_pam(const char *user) |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 349 | { |
| 350 | int pam_retval; |
Damien Miller | ac2b1a5 | 2001-02-11 22:39:19 +1100 | [diff] [blame] | 351 | extern ServerOptions options; |
Kevin Steves | 5f3b9b9 | 2001-04-23 17:28:28 +0000 | [diff] [blame] | 352 | extern u_int utmp_len; |
| 353 | const char *rhost; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 354 | |
Damien Miller | 22e22bf | 2001-01-19 15:46:38 +1100 | [diff] [blame] | 355 | debug("Starting up PAM with username \"%.200s\"", user); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 356 | |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 357 | pam_retval = pam_start(SSHD_PAM_SERVICE, user, &conv, &__pamh); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 358 | |
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 initialisation failed[%d]: %.200s", |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 361 | pam_retval, PAM_STRERROR(__pamh, pam_retval)); |
Damien Miller | bd5817d | 2001-02-11 22:35:11 +1100 | [diff] [blame] | 362 | |
Kevin Steves | 5f3b9b9 | 2001-04-23 17:28:28 +0000 | [diff] [blame] | 363 | rhost = get_remote_name_or_ip(utmp_len, options.reverse_mapping_check); |
| 364 | debug("PAM setting rhost to \"%.200s\"", rhost); |
| 365 | |
| 366 | pam_retval = pam_set_item(__pamh, PAM_RHOST, rhost); |
Damien Miller | bd5817d | 2001-02-11 22:35:11 +1100 | [diff] [blame] | 367 | if (pam_retval != PAM_SUCCESS) |
| 368 | fatal("PAM set rhost failed[%d]: %.200s", pam_retval, |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 369 | PAM_STRERROR(__pamh, pam_retval)); |
Damien Miller | 4e99720 | 2000-07-09 21:21:52 +1000 | [diff] [blame] | 370 | #ifdef PAM_TTY_KLUDGE |
Damien Miller | c19fd5f | 2000-06-22 21:44:54 +1000 | [diff] [blame] | 371 | /* |
| 372 | * Some PAM modules (e.g. pam_time) require a TTY to operate, |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 373 | * 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] | 374 | * sshd doesn't set the tty until too late in the auth process and may |
| 375 | * not even need one (for tty-less connections) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 376 | * Kludge: Set a fake PAM_TTY |
Damien Miller | c19fd5f | 2000-06-22 21:44:54 +1000 | [diff] [blame] | 377 | */ |
Damien Miller | 33cdd9e | 2001-10-28 22:33:48 +1100 | [diff] [blame] | 378 | pam_retval = pam_set_item(__pamh, PAM_TTY, "NODEVssh"); |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 379 | if (pam_retval != PAM_SUCCESS) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 380 | fatal("PAM set tty failed[%d]: %.200s", |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 381 | pam_retval, PAM_STRERROR(__pamh, pam_retval)); |
Damien Miller | 4e99720 | 2000-07-09 21:21:52 +1000 | [diff] [blame] | 382 | #endif /* PAM_TTY_KLUDGE */ |
Damien Miller | 7b22d65 | 2000-06-18 14:07:04 +1000 | [diff] [blame] | 383 | |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 384 | fatal_add_cleanup(&do_pam_cleanup_proc, NULL); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 385 | } |
| 386 | |
| 387 | /* Return list of PAM enviornment strings */ |
| 388 | char **fetch_pam_environment(void) |
| 389 | { |
Damien Miller | 1bead33 | 2000-04-30 00:47:29 +1000 | [diff] [blame] | 390 | #ifdef HAVE_PAM_GETENVLIST |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 391 | return(pam_getenvlist(__pamh)); |
Damien Miller | 1bead33 | 2000-04-30 00:47:29 +1000 | [diff] [blame] | 392 | #else /* HAVE_PAM_GETENVLIST */ |
| 393 | return(NULL); |
| 394 | #endif /* HAVE_PAM_GETENVLIST */ |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 395 | } |
| 396 | |
| 397 | /* Print any messages that have been generated during authentication */ |
| 398 | /* or account checking to stderr */ |
| 399 | void print_pam_messages(void) |
| 400 | { |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 401 | if (__pam_msg != NULL) |
| 402 | fputs(__pam_msg, stderr); |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 403 | } |
| 404 | |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 405 | /* Append a message to buffer */ |
| 406 | void message_cat(char **p, const char *a) |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 407 | { |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 408 | char *cp; |
| 409 | size_t new_len; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 410 | |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 411 | new_len = strlen(a); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 412 | |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 413 | if (*p) { |
| 414 | size_t len = strlen(*p); |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 415 | |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 416 | *p = xrealloc(*p, new_len + len + 2); |
| 417 | cp = *p + len; |
| 418 | } else |
| 419 | *p = cp = xmalloc(new_len + 2); |
| 420 | |
| 421 | memcpy(cp, a, new_len); |
| 422 | cp[new_len] = '\n'; |
| 423 | cp[new_len + 1] = '\0'; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 424 | } |
| 425 | |
| 426 | #endif /* USE_PAM */ |