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" |
Kevin Steves | 63007d4 | 2002-07-21 17:57:01 +0000 | [diff] [blame^] | 32 | #include "auth-options.h" |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 33 | #include "auth-pam.h" |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 34 | #include "servconf.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 35 | #include "canohost.h" |
| 36 | #include "readpass.h" |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 37 | |
Kevin Steves | 85ecbe7 | 2001-04-20 17:43:47 +0000 | [diff] [blame] | 38 | extern char *__progname; |
| 39 | |
Kevin Steves | 63007d4 | 2002-07-21 17:57:01 +0000 | [diff] [blame^] | 40 | extern int use_privsep; |
| 41 | |
| 42 | RCSID("$Id: auth-pam.c,v 1.49 2002/07/21 17:57:01 stevesk Exp $"); |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 43 | |
| 44 | #define NEW_AUTHTOK_MSG \ |
Kevin Steves | 6cdecd0 | 2002-07-21 17:26:54 +0000 | [diff] [blame] | 45 | "Warning: Your password has expired, please change it now." |
Kevin Steves | 63007d4 | 2002-07-21 17:57:01 +0000 | [diff] [blame^] | 46 | #define NEW_AUTHTOK_MSG_PRIVSEP \ |
| 47 | "Your password has expired, the session cannot proceed." |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 48 | |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 49 | static int do_pam_conversation(int num_msg, const struct pam_message **msg, |
| 50 | struct pam_response **resp, void *appdata_ptr); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 51 | |
| 52 | /* module-local variables */ |
| 53 | static struct pam_conv conv = { |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 54 | do_pam_conversation, |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 55 | NULL |
| 56 | }; |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 57 | static char *__pam_msg = NULL; |
| 58 | static pam_handle_t *__pamh = NULL; |
| 59 | static const char *__pampasswd = NULL; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 60 | |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 61 | /* states for do_pam_conversation() */ |
Damien Miller | b848158 | 2000-12-03 11:51:51 +1100 | [diff] [blame] | 62 | enum { INITIAL_LOGIN, OTHER } pamstate = INITIAL_LOGIN; |
Kevin Steves | 6cdecd0 | 2002-07-21 17:26:54 +0000 | [diff] [blame] | 63 | /* remember whether pam_acct_mgmt() returned PAM_NEW_AUTHTOK_REQD */ |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 64 | static int password_change_required = 0; |
Damien Miller | b848158 | 2000-12-03 11:51:51 +1100 | [diff] [blame] | 65 | /* remember whether the last pam_authenticate() succeeded or not */ |
| 66 | static int was_authenticated = 0; |
| 67 | |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 68 | /* Remember what has been initialised */ |
| 69 | static int session_opened = 0; |
| 70 | static int creds_set = 0; |
| 71 | |
Damien Miller | b848158 | 2000-12-03 11:51:51 +1100 | [diff] [blame] | 72 | /* accessor which allows us to switch conversation structs according to |
| 73 | * the authentication method being used */ |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 74 | void do_pam_set_conv(struct pam_conv *conv) |
Damien Miller | b848158 | 2000-12-03 11:51:51 +1100 | [diff] [blame] | 75 | { |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 76 | pam_set_item(__pamh, PAM_CONV, conv); |
Damien Miller | b848158 | 2000-12-03 11:51:51 +1100 | [diff] [blame] | 77 | } |
| 78 | |
| 79 | /* start an authentication run */ |
| 80 | int do_pam_authenticate(int flags) |
| 81 | { |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 82 | int retval = pam_authenticate(__pamh, flags); |
Damien Miller | b848158 | 2000-12-03 11:51:51 +1100 | [diff] [blame] | 83 | was_authenticated = (retval == PAM_SUCCESS); |
| 84 | return retval; |
| 85 | } |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 86 | |
| 87 | /* |
| 88 | * PAM conversation function. |
| 89 | * There are two states this can run in. |
| 90 | * |
| 91 | * INITIAL_LOGIN mode simply feeds the password from the client into |
| 92 | * PAM in response to PAM_PROMPT_ECHO_OFF, and collects output |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 93 | * messages with into __pam_msg. This is used during initial |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 94 | * authentication to bypass the normal PAM password prompt. |
| 95 | * |
Damien Miller | 0925648 | 2001-10-28 22:36:55 +1100 | [diff] [blame] | 96 | * OTHER mode handles PAM_PROMPT_ECHO_OFF with read_passphrase() |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 97 | * and outputs messages to stderr. This mode is used if pam_chauthtok() |
| 98 | * is called to update expired passwords. |
| 99 | */ |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 100 | 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] | 101 | struct pam_response **resp, void *appdata_ptr) |
| 102 | { |
| 103 | struct pam_response *reply; |
| 104 | int count; |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 105 | char buf[1024]; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 106 | |
| 107 | /* PAM will free this later */ |
Damien Miller | 23fe57c | 2002-07-02 17:08:23 +1000 | [diff] [blame] | 108 | reply = xmalloc(num_msg * sizeof(*reply)); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 109 | |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 110 | for (count = 0; count < num_msg; count++) { |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 111 | if (pamstate == INITIAL_LOGIN) { |
| 112 | /* |
| 113 | * We can't use stdio yet, queue messages for |
| 114 | * printing later |
| 115 | */ |
| 116 | switch(PAM_MSG_MEMBER(msg, count, msg_style)) { |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 117 | case PAM_PROMPT_ECHO_ON: |
Damien Miller | 23fe57c | 2002-07-02 17:08:23 +1000 | [diff] [blame] | 118 | xfree(reply); |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 119 | return PAM_CONV_ERR; |
| 120 | case PAM_PROMPT_ECHO_OFF: |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 121 | if (__pampasswd == NULL) { |
Damien Miller | 23fe57c | 2002-07-02 17:08:23 +1000 | [diff] [blame] | 122 | xfree(reply); |
Damien Miller | 60819b4 | 2000-10-14 11:16:12 +1100 | [diff] [blame] | 123 | return PAM_CONV_ERR; |
Damien Miller | 60819b4 | 2000-10-14 11:16:12 +1100 | [diff] [blame] | 124 | } |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 125 | reply[count].resp = xstrdup(__pampasswd); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 126 | reply[count].resp_retcode = PAM_SUCCESS; |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 127 | break; |
| 128 | case PAM_ERROR_MSG: |
| 129 | case PAM_TEXT_INFO: |
Damien Miller | 23fe57c | 2002-07-02 17:08:23 +1000 | [diff] [blame] | 130 | if (PAM_MSG_MEMBER(msg, count, msg) != NULL) { |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 131 | message_cat(&__pam_msg, |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 132 | PAM_MSG_MEMBER(msg, count, msg)); |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 133 | } |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 134 | reply[count].resp = xstrdup(""); |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 135 | reply[count].resp_retcode = PAM_SUCCESS; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 136 | break; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 137 | default: |
Damien Miller | 23fe57c | 2002-07-02 17:08:23 +1000 | [diff] [blame] | 138 | xfree(reply); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 139 | return PAM_CONV_ERR; |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 140 | } |
| 141 | } else { |
| 142 | /* |
| 143 | * stdio is connected, so interact directly |
| 144 | */ |
| 145 | switch(PAM_MSG_MEMBER(msg, count, msg_style)) { |
| 146 | case PAM_PROMPT_ECHO_ON: |
| 147 | fputs(PAM_MSG_MEMBER(msg, count, msg), stderr); |
| 148 | fgets(buf, sizeof(buf), stdin); |
| 149 | reply[count].resp = xstrdup(buf); |
| 150 | reply[count].resp_retcode = PAM_SUCCESS; |
| 151 | break; |
| 152 | case PAM_PROMPT_ECHO_OFF: |
Damien Miller | 0925648 | 2001-10-28 22:36:55 +1100 | [diff] [blame] | 153 | reply[count].resp = |
Kevin Steves | fe2f4a1 | 2001-10-28 17:32:38 +0000 | [diff] [blame] | 154 | read_passphrase(PAM_MSG_MEMBER(msg, count, |
| 155 | msg), RP_ALLOW_STDIN); |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 156 | reply[count].resp_retcode = PAM_SUCCESS; |
| 157 | break; |
| 158 | case PAM_ERROR_MSG: |
| 159 | case PAM_TEXT_INFO: |
| 160 | if ((*msg)[count].msg != NULL) |
| 161 | fprintf(stderr, "%s\n", |
| 162 | PAM_MSG_MEMBER(msg, count, msg)); |
| 163 | reply[count].resp = xstrdup(""); |
| 164 | reply[count].resp_retcode = PAM_SUCCESS; |
| 165 | break; |
| 166 | default: |
Damien Miller | 23fe57c | 2002-07-02 17:08:23 +1000 | [diff] [blame] | 167 | xfree(reply); |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 168 | return PAM_CONV_ERR; |
| 169 | } |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 170 | } |
| 171 | } |
| 172 | |
| 173 | *resp = reply; |
| 174 | |
| 175 | return PAM_SUCCESS; |
| 176 | } |
| 177 | |
| 178 | /* Called at exit to cleanly shutdown PAM */ |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 179 | void do_pam_cleanup_proc(void *context) |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 180 | { |
Damien Miller | 2e9adb2 | 2001-03-21 12:16:24 +1100 | [diff] [blame] | 181 | int pam_retval = PAM_SUCCESS; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 182 | |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 183 | if (__pamh && session_opened) { |
| 184 | pam_retval = pam_close_session(__pamh, 0); |
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 close PAM session[%d]: %.200s", |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 187 | pam_retval, PAM_STRERROR(__pamh, pam_retval)); |
Damien Miller | 3dfeee4 | 2001-02-14 00:43:55 +1100 | [diff] [blame] | 188 | } |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 189 | |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 190 | if (__pamh && creds_set) { |
| 191 | pam_retval = pam_setcred(__pamh, PAM_DELETE_CRED); |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 192 | if (pam_retval != PAM_SUCCESS) |
| 193 | debug("Cannot delete credentials[%d]: %.200s", |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 194 | pam_retval, PAM_STRERROR(__pamh, pam_retval)); |
Damien Miller | 3dfeee4 | 2001-02-14 00:43:55 +1100 | [diff] [blame] | 195 | } |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 196 | |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 197 | if (__pamh) { |
| 198 | pam_retval = pam_end(__pamh, pam_retval); |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 199 | if (pam_retval != PAM_SUCCESS) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 200 | log("Cannot release PAM authentication[%d]: %.200s", |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 201 | pam_retval, PAM_STRERROR(__pamh, pam_retval)); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 202 | } |
| 203 | } |
| 204 | |
| 205 | /* Attempt password authentation using PAM */ |
Kevin Steves | e683e76 | 2002-04-04 19:02:28 +0000 | [diff] [blame] | 206 | int auth_pam_password(Authctxt *authctxt, const char *password) |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 207 | { |
| 208 | extern ServerOptions options; |
| 209 | int pam_retval; |
Kevin Steves | e683e76 | 2002-04-04 19:02:28 +0000 | [diff] [blame] | 210 | struct passwd *pw = authctxt->pw; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 211 | |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 212 | do_pam_set_conv(&conv); |
Damien Miller | b848158 | 2000-12-03 11:51:51 +1100 | [diff] [blame] | 213 | |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 214 | /* deny if no user. */ |
| 215 | if (pw == NULL) |
| 216 | return 0; |
Kevin Steves | 706e7a9 | 2001-04-23 18:38:37 +0000 | [diff] [blame] | 217 | if (pw->pw_uid == 0 && options.permit_root_login == PERMIT_NO_PASSWD) |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 218 | return 0; |
| 219 | if (*password == '\0' && options.permit_empty_passwd == 0) |
| 220 | return 0; |
| 221 | |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 222 | __pampasswd = password; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 223 | |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 224 | pamstate = INITIAL_LOGIN; |
Kevin Steves | de77b46 | 2001-11-09 20:22:16 +0000 | [diff] [blame] | 225 | pam_retval = do_pam_authenticate( |
| 226 | options.permit_empty_passwd == 0 ? PAM_DISALLOW_NULL_AUTHTOK : 0); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 227 | if (pam_retval == PAM_SUCCESS) { |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 228 | debug("PAM Password authentication accepted for " |
| 229 | "user \"%.100s\"", pw->pw_name); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 230 | return 1; |
| 231 | } else { |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 232 | debug("PAM Password authentication for \"%.100s\" " |
| 233 | "failed[%d]: %s", pw->pw_name, pam_retval, |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 234 | PAM_STRERROR(__pamh, pam_retval)); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 235 | return 0; |
| 236 | } |
| 237 | } |
| 238 | |
| 239 | /* Do account management using PAM */ |
| 240 | int do_pam_account(char *username, char *remote_user) |
| 241 | { |
| 242 | int pam_retval; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 243 | |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 244 | do_pam_set_conv(&conv); |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 245 | |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 246 | if (remote_user) { |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 247 | debug("PAM setting ruser to \"%.200s\"", remote_user); |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 248 | pam_retval = pam_set_item(__pamh, PAM_RUSER, remote_user); |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 249 | if (pam_retval != PAM_SUCCESS) |
| 250 | fatal("PAM set ruser failed[%d]: %.200s", pam_retval, |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 251 | PAM_STRERROR(__pamh, pam_retval)); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 252 | } |
| 253 | |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 254 | pam_retval = pam_acct_mgmt(__pamh, 0); |
Damien Miller | 7941855 | 2002-04-23 20:28:48 +1000 | [diff] [blame] | 255 | debug2("pam_acct_mgmt() = %d", pam_retval); |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 256 | switch (pam_retval) { |
| 257 | case PAM_SUCCESS: |
| 258 | /* This is what we want */ |
| 259 | break; |
Damien Miller | ae9d5af | 2002-04-26 11:27:24 +1000 | [diff] [blame] | 260 | #if 0 |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 261 | case PAM_NEW_AUTHTOK_REQD: |
Kevin Steves | 63007d4 | 2002-07-21 17:57:01 +0000 | [diff] [blame^] | 262 | message_cat(&__pam_msg, use_privsep ? |
| 263 | NEW_AUTHTOK_MSG_PRIVSEP : NEW_AUTHTOK_MSG); |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 264 | /* flag that password change is necessary */ |
| 265 | password_change_required = 1; |
Kevin Steves | 63007d4 | 2002-07-21 17:57:01 +0000 | [diff] [blame^] | 266 | /* disallow other functionality for now */ |
| 267 | no_port_forwarding_flag |= 2; |
| 268 | no_agent_forwarding_flag |= 2; |
| 269 | no_x11_forwarding_flag |= 2; |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 270 | break; |
Damien Miller | ae9d5af | 2002-04-26 11:27:24 +1000 | [diff] [blame] | 271 | #endif |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 272 | default: |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 273 | log("PAM rejected by account configuration[%d]: " |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 274 | "%.200s", pam_retval, PAM_STRERROR(__pamh, |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 275 | pam_retval)); |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 276 | return(0); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 277 | } |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 278 | |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 279 | return(1); |
| 280 | } |
| 281 | |
| 282 | /* Do PAM-specific session initialisation */ |
Damien Miller | 3e955e7 | 2000-01-27 10:55:38 +1100 | [diff] [blame] | 283 | void do_pam_session(char *username, const char *ttyname) |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 284 | { |
| 285 | int pam_retval; |
| 286 | |
Damien Miller | 882c2ee | 2001-03-01 09:18:57 +1100 | [diff] [blame] | 287 | do_pam_set_conv(&conv); |
| 288 | |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 289 | if (ttyname != NULL) { |
| 290 | debug("PAM setting tty to \"%.200s\"", ttyname); |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 291 | pam_retval = pam_set_item(__pamh, PAM_TTY, ttyname); |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 292 | if (pam_retval != PAM_SUCCESS) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 293 | fatal("PAM set tty failed[%d]: %.200s", |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 294 | pam_retval, PAM_STRERROR(__pamh, pam_retval)); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 295 | } |
| 296 | |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 297 | pam_retval = pam_open_session(__pamh, 0); |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 298 | if (pam_retval != PAM_SUCCESS) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 299 | fatal("PAM session setup failed[%d]: %.200s", |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 300 | pam_retval, PAM_STRERROR(__pamh, pam_retval)); |
Damien Miller | 31a501d | 2001-02-27 09:20:48 +1100 | [diff] [blame] | 301 | |
Damien Miller | 3dfeee4 | 2001-02-14 00:43:55 +1100 | [diff] [blame] | 302 | session_opened = 1; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 303 | } |
| 304 | |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 305 | /* Set PAM credentials */ |
Damien Miller | f9e9300 | 2001-03-27 16:12:24 +1000 | [diff] [blame] | 306 | void do_pam_setcred(int init) |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 307 | { |
| 308 | int pam_retval; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 309 | |
Damien Miller | f762a4b | 2002-05-08 12:27:55 +1000 | [diff] [blame] | 310 | if (__pamh == NULL) |
| 311 | return; |
| 312 | |
Damien Miller | 882c2ee | 2001-03-01 09:18:57 +1100 | [diff] [blame] | 313 | do_pam_set_conv(&conv); |
| 314 | |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 315 | debug("PAM establishing creds"); |
Damien Miller | f9e9300 | 2001-03-27 16:12:24 +1000 | [diff] [blame] | 316 | pam_retval = pam_setcred(__pamh, |
| 317 | init ? PAM_ESTABLISH_CRED : PAM_REINITIALIZE_CRED); |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 318 | if (pam_retval != PAM_SUCCESS) { |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 319 | if (was_authenticated) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 320 | fatal("PAM setcred failed[%d]: %.200s", |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 321 | pam_retval, PAM_STRERROR(__pamh, pam_retval)); |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 322 | else |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 323 | debug("PAM setcred failed[%d]: %.200s", |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 324 | pam_retval, PAM_STRERROR(__pamh, pam_retval)); |
Damien Miller | 3dfeee4 | 2001-02-14 00:43:55 +1100 | [diff] [blame] | 325 | } else |
| 326 | creds_set = 1; |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 327 | } |
| 328 | |
Kevin Steves | 092f2ef | 2000-10-14 13:36:13 +0000 | [diff] [blame] | 329 | /* accessor function for file scope static variable */ |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 330 | int is_pam_password_change_required(void) |
Kevin Steves | 092f2ef | 2000-10-14 13:36:13 +0000 | [diff] [blame] | 331 | { |
| 332 | return password_change_required; |
| 333 | } |
| 334 | |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 335 | /* |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 336 | * Have user change authentication token if pam_acct_mgmt() indicated |
| 337 | * it was expired. This needs to be called after an interactive |
| 338 | * session is established and the user's pty is connected to |
Kevin Steves | 6cdecd0 | 2002-07-21 17:26:54 +0000 | [diff] [blame] | 339 | * stdin/stdout/stderr. |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 340 | */ |
Kevin Steves | 6beac8c | 2000-10-14 15:08:49 +0000 | [diff] [blame] | 341 | void do_pam_chauthtok(void) |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 342 | { |
| 343 | int pam_retval; |
| 344 | |
Damien Miller | 882c2ee | 2001-03-01 09:18:57 +1100 | [diff] [blame] | 345 | do_pam_set_conv(&conv); |
| 346 | |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 347 | if (password_change_required) { |
Kevin Steves | 63007d4 | 2002-07-21 17:57:01 +0000 | [diff] [blame^] | 348 | if (use_privsep) |
| 349 | fatal("Password changing is currently unsupported" |
| 350 | " with privilege separation"); |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 351 | pamstate = OTHER; |
Damien Miller | ec7e1b1 | 2001-03-21 13:01:35 +1100 | [diff] [blame] | 352 | pam_retval = pam_chauthtok(__pamh, PAM_CHANGE_EXPIRED_AUTHTOK); |
| 353 | if (pam_retval != PAM_SUCCESS) |
| 354 | fatal("PAM pam_chauthtok failed[%d]: %.200s", |
| 355 | pam_retval, PAM_STRERROR(__pamh, pam_retval)); |
Kevin Steves | 63007d4 | 2002-07-21 17:57:01 +0000 | [diff] [blame^] | 356 | #if 0 |
| 357 | /* XXX: This would need to be done in the parent process, |
| 358 | * but there's currently no way to pass such request. */ |
| 359 | no_port_forwarding_flag &= ~2; |
| 360 | no_agent_forwarding_flag &= ~2; |
| 361 | no_x11_forwarding_flag &= ~2; |
| 362 | if (!no_port_forwarding_flag && options.allow_tcp_forwarding) |
| 363 | channel_permit_all_opens(); |
| 364 | #endif |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 365 | } |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 366 | } |
| 367 | |
| 368 | /* Cleanly shutdown PAM */ |
| 369 | void finish_pam(void) |
| 370 | { |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 371 | do_pam_cleanup_proc(NULL); |
| 372 | fatal_remove_cleanup(&do_pam_cleanup_proc, NULL); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 373 | } |
| 374 | |
| 375 | /* Start PAM authentication for specified account */ |
Damien Miller | 22e22bf | 2001-01-19 15:46:38 +1100 | [diff] [blame] | 376 | void start_pam(const char *user) |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 377 | { |
| 378 | int pam_retval; |
Damien Miller | ac2b1a5 | 2001-02-11 22:39:19 +1100 | [diff] [blame] | 379 | extern ServerOptions options; |
Kevin Steves | 5f3b9b9 | 2001-04-23 17:28:28 +0000 | [diff] [blame] | 380 | extern u_int utmp_len; |
| 381 | const char *rhost; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 382 | |
Damien Miller | 22e22bf | 2001-01-19 15:46:38 +1100 | [diff] [blame] | 383 | debug("Starting up PAM with username \"%.200s\"", user); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 384 | |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 385 | pam_retval = pam_start(SSHD_PAM_SERVICE, user, &conv, &__pamh); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 386 | |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 387 | if (pam_retval != PAM_SUCCESS) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 388 | fatal("PAM initialisation failed[%d]: %.200s", |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 389 | pam_retval, PAM_STRERROR(__pamh, pam_retval)); |
Damien Miller | bd5817d | 2001-02-11 22:35:11 +1100 | [diff] [blame] | 390 | |
Damien Miller | f3451a2 | 2002-02-05 12:40:46 +1100 | [diff] [blame] | 391 | rhost = get_remote_name_or_ip(utmp_len, options.verify_reverse_mapping); |
Kevin Steves | 5f3b9b9 | 2001-04-23 17:28:28 +0000 | [diff] [blame] | 392 | debug("PAM setting rhost to \"%.200s\"", rhost); |
| 393 | |
| 394 | pam_retval = pam_set_item(__pamh, PAM_RHOST, rhost); |
Damien Miller | bd5817d | 2001-02-11 22:35:11 +1100 | [diff] [blame] | 395 | if (pam_retval != PAM_SUCCESS) |
| 396 | fatal("PAM set rhost failed[%d]: %.200s", pam_retval, |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 397 | PAM_STRERROR(__pamh, pam_retval)); |
Damien Miller | 4e99720 | 2000-07-09 21:21:52 +1000 | [diff] [blame] | 398 | #ifdef PAM_TTY_KLUDGE |
Damien Miller | c19fd5f | 2000-06-22 21:44:54 +1000 | [diff] [blame] | 399 | /* |
| 400 | * Some PAM modules (e.g. pam_time) require a TTY to operate, |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 401 | * 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] | 402 | * sshd doesn't set the tty until too late in the auth process and may |
| 403 | * not even need one (for tty-less connections) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 404 | * Kludge: Set a fake PAM_TTY |
Damien Miller | c19fd5f | 2000-06-22 21:44:54 +1000 | [diff] [blame] | 405 | */ |
Damien Miller | 33cdd9e | 2001-10-28 22:33:48 +1100 | [diff] [blame] | 406 | pam_retval = pam_set_item(__pamh, PAM_TTY, "NODEVssh"); |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 407 | if (pam_retval != PAM_SUCCESS) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 408 | fatal("PAM set tty failed[%d]: %.200s", |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 409 | pam_retval, PAM_STRERROR(__pamh, pam_retval)); |
Damien Miller | 4e99720 | 2000-07-09 21:21:52 +1000 | [diff] [blame] | 410 | #endif /* PAM_TTY_KLUDGE */ |
Damien Miller | 7b22d65 | 2000-06-18 14:07:04 +1000 | [diff] [blame] | 411 | |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 412 | fatal_add_cleanup(&do_pam_cleanup_proc, NULL); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 413 | } |
| 414 | |
| 415 | /* Return list of PAM enviornment strings */ |
| 416 | char **fetch_pam_environment(void) |
| 417 | { |
Damien Miller | 1bead33 | 2000-04-30 00:47:29 +1000 | [diff] [blame] | 418 | #ifdef HAVE_PAM_GETENVLIST |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 419 | return(pam_getenvlist(__pamh)); |
Damien Miller | 1bead33 | 2000-04-30 00:47:29 +1000 | [diff] [blame] | 420 | #else /* HAVE_PAM_GETENVLIST */ |
| 421 | return(NULL); |
| 422 | #endif /* HAVE_PAM_GETENVLIST */ |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 423 | } |
| 424 | |
| 425 | /* Print any messages that have been generated during authentication */ |
| 426 | /* or account checking to stderr */ |
| 427 | void print_pam_messages(void) |
| 428 | { |
Damien Miller | 646aa60 | 2001-02-15 11:51:32 +1100 | [diff] [blame] | 429 | if (__pam_msg != NULL) |
| 430 | fputs(__pam_msg, stderr); |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 431 | } |
| 432 | |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 433 | /* Append a message to buffer */ |
| 434 | void message_cat(char **p, const char *a) |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 435 | { |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 436 | char *cp; |
| 437 | size_t new_len; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 438 | |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 439 | new_len = strlen(a); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 440 | |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 441 | if (*p) { |
| 442 | size_t len = strlen(*p); |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 443 | |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 444 | *p = xrealloc(*p, new_len + len + 2); |
| 445 | cp = *p + len; |
| 446 | } else |
| 447 | *p = cp = xmalloc(new_len + 2); |
| 448 | |
| 449 | memcpy(cp, a, new_len); |
| 450 | cp[new_len] = '\n'; |
| 451 | cp[new_len + 1] = '\0'; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 452 | } |
| 453 | |
| 454 | #endif /* USE_PAM */ |