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 | 3dfeee4 | 2001-02-14 00:43:55 +1100 | [diff] [blame] | 36 | RCSID("$Id: auth-pam.c,v 1.28 2001/02/13 13:43:56 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 | |
Damien Miller | 3dfeee4 | 2001-02-14 00:43:55 +1100 | [diff] [blame] | 75 | /* Remember what has been initialised */ |
| 76 | static int session_opened = 0; |
| 77 | static int creds_set = 0; |
| 78 | |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 79 | /* |
| 80 | * PAM conversation function. |
| 81 | * There are two states this can run in. |
| 82 | * |
| 83 | * INITIAL_LOGIN mode simply feeds the password from the client into |
| 84 | * PAM in response to PAM_PROMPT_ECHO_OFF, and collects output |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 85 | * messages with into pam_msg. This is used during initial |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 86 | * authentication to bypass the normal PAM password prompt. |
| 87 | * |
| 88 | * OTHER mode handles PAM_PROMPT_ECHO_OFF with read_passphrase(prompt, 1) |
| 89 | * and outputs messages to stderr. This mode is used if pam_chauthtok() |
| 90 | * is called to update expired passwords. |
| 91 | */ |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 92 | 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] | 93 | struct pam_response **resp, void *appdata_ptr) |
| 94 | { |
| 95 | struct pam_response *reply; |
| 96 | int count; |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 97 | char buf[1024]; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 98 | |
| 99 | /* PAM will free this later */ |
| 100 | reply = malloc(num_msg * sizeof(*reply)); |
| 101 | if (reply == NULL) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 102 | return PAM_CONV_ERR; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 103 | |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 104 | for (count = 0; count < num_msg; count++) { |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 105 | if (pamstate == INITIAL_LOGIN) { |
| 106 | /* |
| 107 | * We can't use stdio yet, queue messages for |
| 108 | * printing later |
| 109 | */ |
| 110 | switch(PAM_MSG_MEMBER(msg, count, msg_style)) { |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 111 | case PAM_PROMPT_ECHO_ON: |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 112 | free(reply); |
| 113 | return PAM_CONV_ERR; |
| 114 | case PAM_PROMPT_ECHO_OFF: |
| 115 | if (pampasswd == NULL) { |
Damien Miller | 60819b4 | 2000-10-14 11:16:12 +1100 | [diff] [blame] | 116 | free(reply); |
| 117 | return PAM_CONV_ERR; |
Damien Miller | 60819b4 | 2000-10-14 11:16:12 +1100 | [diff] [blame] | 118 | } |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 119 | reply[count].resp = xstrdup(pampasswd); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 120 | reply[count].resp_retcode = PAM_SUCCESS; |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 121 | break; |
| 122 | case PAM_ERROR_MSG: |
| 123 | case PAM_TEXT_INFO: |
| 124 | if ((*msg)[count].msg != NULL) { |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 125 | message_cat(&pam_msg, |
| 126 | PAM_MSG_MEMBER(msg, count, msg)); |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 127 | } |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 128 | reply[count].resp = xstrdup(""); |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 129 | reply[count].resp_retcode = PAM_SUCCESS; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 130 | break; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 131 | default: |
| 132 | free(reply); |
| 133 | return PAM_CONV_ERR; |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 134 | } |
| 135 | } else { |
| 136 | /* |
| 137 | * stdio is connected, so interact directly |
| 138 | */ |
| 139 | switch(PAM_MSG_MEMBER(msg, count, msg_style)) { |
| 140 | case PAM_PROMPT_ECHO_ON: |
| 141 | fputs(PAM_MSG_MEMBER(msg, count, msg), stderr); |
| 142 | fgets(buf, sizeof(buf), stdin); |
| 143 | reply[count].resp = xstrdup(buf); |
| 144 | reply[count].resp_retcode = PAM_SUCCESS; |
| 145 | break; |
| 146 | case PAM_PROMPT_ECHO_OFF: |
| 147 | reply[count].resp = xstrdup( |
| 148 | read_passphrase(PAM_MSG_MEMBER(msg, count, |
| 149 | msg), 1)); |
| 150 | reply[count].resp_retcode = PAM_SUCCESS; |
| 151 | break; |
| 152 | case PAM_ERROR_MSG: |
| 153 | case PAM_TEXT_INFO: |
| 154 | if ((*msg)[count].msg != NULL) |
| 155 | fprintf(stderr, "%s\n", |
| 156 | PAM_MSG_MEMBER(msg, count, msg)); |
| 157 | reply[count].resp = xstrdup(""); |
| 158 | reply[count].resp_retcode = PAM_SUCCESS; |
| 159 | break; |
| 160 | default: |
| 161 | free(reply); |
| 162 | return PAM_CONV_ERR; |
| 163 | } |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 164 | } |
| 165 | } |
| 166 | |
| 167 | *resp = reply; |
| 168 | |
| 169 | return PAM_SUCCESS; |
| 170 | } |
| 171 | |
| 172 | /* Called at exit to cleanly shutdown PAM */ |
| 173 | void pam_cleanup_proc(void *context) |
| 174 | { |
| 175 | int pam_retval; |
| 176 | |
Damien Miller | 3dfeee4 | 2001-02-14 00:43:55 +1100 | [diff] [blame] | 177 | if (pamh && session_opened) { |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 178 | pam_retval = pam_close_session(pamh, 0); |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 179 | if (pam_retval != PAM_SUCCESS) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 180 | log("Cannot close PAM session[%d]: %.200s", |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 181 | pam_retval, PAM_STRERROR(pamh, pam_retval)); |
Damien Miller | 3dfeee4 | 2001-02-14 00:43:55 +1100 | [diff] [blame] | 182 | } |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 183 | |
Damien Miller | 3dfeee4 | 2001-02-14 00:43:55 +1100 | [diff] [blame] | 184 | if (pamh && creds_set) { |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 185 | pam_retval = pam_setcred(pamh, PAM_DELETE_CRED); |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 186 | if (pam_retval != PAM_SUCCESS) |
| 187 | debug("Cannot delete credentials[%d]: %.200s", |
| 188 | pam_retval, PAM_STRERROR(pamh, pam_retval)); |
Damien Miller | 3dfeee4 | 2001-02-14 00:43:55 +1100 | [diff] [blame] | 189 | } |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 190 | |
Damien Miller | 3dfeee4 | 2001-02-14 00:43:55 +1100 | [diff] [blame] | 191 | if (pamh) { |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 192 | pam_retval = pam_end(pamh, pam_retval); |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 193 | if (pam_retval != PAM_SUCCESS) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 194 | log("Cannot release PAM authentication[%d]: %.200s", |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 195 | pam_retval, PAM_STRERROR(pamh, pam_retval)); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 196 | } |
| 197 | } |
| 198 | |
| 199 | /* Attempt password authentation using PAM */ |
| 200 | int auth_pam_password(struct passwd *pw, const char *password) |
| 201 | { |
| 202 | extern ServerOptions options; |
| 203 | int pam_retval; |
| 204 | |
Damien Miller | b848158 | 2000-12-03 11:51:51 +1100 | [diff] [blame] | 205 | pam_set_conv(&conv); |
| 206 | |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 207 | /* deny if no user. */ |
| 208 | if (pw == NULL) |
| 209 | return 0; |
| 210 | if (pw->pw_uid == 0 && options.permit_root_login == 2) |
| 211 | return 0; |
| 212 | if (*password == '\0' && options.permit_empty_passwd == 0) |
| 213 | return 0; |
| 214 | |
| 215 | pampasswd = password; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 216 | |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 217 | pamstate = INITIAL_LOGIN; |
Damien Miller | b848158 | 2000-12-03 11:51:51 +1100 | [diff] [blame] | 218 | pam_retval = do_pam_authenticate(0); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 219 | if (pam_retval == PAM_SUCCESS) { |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 220 | debug("PAM Password authentication accepted for " |
| 221 | "user \"%.100s\"", pw->pw_name); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 222 | return 1; |
| 223 | } else { |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 224 | debug("PAM Password authentication for \"%.100s\" " |
| 225 | "failed[%d]: %s", pw->pw_name, pam_retval, |
| 226 | PAM_STRERROR(pamh, pam_retval)); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 227 | return 0; |
| 228 | } |
| 229 | } |
| 230 | |
| 231 | /* Do account management using PAM */ |
| 232 | int do_pam_account(char *username, char *remote_user) |
| 233 | { |
| 234 | int pam_retval; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 235 | |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 236 | pam_set_conv(&conv); |
| 237 | |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 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 | 3dfeee4 | 2001-02-14 00:43:55 +1100 | [diff] [blame] | 283 | session_opened = 1; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 284 | } |
| 285 | |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 286 | /* Set PAM credentials */ |
Kevin Steves | 6beac8c | 2000-10-14 15:08:49 +0000 | [diff] [blame] | 287 | void do_pam_setcred(void) |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 288 | { |
| 289 | int pam_retval; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 290 | |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 291 | debug("PAM establishing creds"); |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 292 | pam_retval = pam_setcred(pamh, PAM_ESTABLISH_CRED); |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 293 | if (pam_retval != PAM_SUCCESS) { |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 294 | if (was_authenticated) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 295 | fatal("PAM setcred failed[%d]: %.200s", |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 296 | pam_retval, PAM_STRERROR(pamh, pam_retval)); |
| 297 | else |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 298 | debug("PAM setcred failed[%d]: %.200s", |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 299 | pam_retval, PAM_STRERROR(pamh, pam_retval)); |
Damien Miller | 3dfeee4 | 2001-02-14 00:43:55 +1100 | [diff] [blame] | 300 | } else |
| 301 | creds_set = 1; |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 302 | } |
| 303 | |
Kevin Steves | 092f2ef | 2000-10-14 13:36:13 +0000 | [diff] [blame] | 304 | /* accessor function for file scope static variable */ |
| 305 | int pam_password_change_required(void) |
| 306 | { |
| 307 | return password_change_required; |
| 308 | } |
| 309 | |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 310 | /* |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 311 | * Have user change authentication token if pam_acct_mgmt() indicated |
| 312 | * it was expired. This needs to be called after an interactive |
| 313 | * session is established and the user's pty is connected to |
| 314 | * stdin/stout/stderr. |
| 315 | */ |
Kevin Steves | 6beac8c | 2000-10-14 15:08:49 +0000 | [diff] [blame] | 316 | void do_pam_chauthtok(void) |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 317 | { |
| 318 | int pam_retval; |
| 319 | |
| 320 | if (password_change_required) { |
| 321 | pamstate = OTHER; |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 322 | /* XXX: should we really loop forever? */ |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 323 | do { |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 324 | pam_retval = pam_chauthtok(pamh, |
| 325 | PAM_CHANGE_EXPIRED_AUTHTOK); |
| 326 | if (pam_retval != PAM_SUCCESS) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 327 | log("PAM pam_chauthtok failed[%d]: %.200s", |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 328 | pam_retval, PAM_STRERROR(pamh, pam_retval)); |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 329 | } while (pam_retval != PAM_SUCCESS); |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 330 | } |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 331 | } |
| 332 | |
| 333 | /* Cleanly shutdown PAM */ |
| 334 | void finish_pam(void) |
| 335 | { |
| 336 | pam_cleanup_proc(NULL); |
| 337 | fatal_remove_cleanup(&pam_cleanup_proc, NULL); |
| 338 | } |
| 339 | |
| 340 | /* Start PAM authentication for specified account */ |
Damien Miller | 22e22bf | 2001-01-19 15:46:38 +1100 | [diff] [blame] | 341 | void start_pam(const char *user) |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 342 | { |
| 343 | int pam_retval; |
Damien Miller | ac2b1a5 | 2001-02-11 22:39:19 +1100 | [diff] [blame] | 344 | extern ServerOptions options; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 345 | |
Damien Miller | 22e22bf | 2001-01-19 15:46:38 +1100 | [diff] [blame] | 346 | debug("Starting up PAM with username \"%.200s\"", user); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 347 | |
Damien Miller | 22e22bf | 2001-01-19 15:46:38 +1100 | [diff] [blame] | 348 | pam_retval = pam_start(SSHD_PAM_SERVICE, user, &conv, &pamh); |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 349 | |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 350 | if (pam_retval != PAM_SUCCESS) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 351 | fatal("PAM initialisation failed[%d]: %.200s", |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 352 | pam_retval, PAM_STRERROR(pamh, pam_retval)); |
Damien Miller | bd5817d | 2001-02-11 22:35:11 +1100 | [diff] [blame] | 353 | |
| 354 | debug("PAM setting rhost to \"%.200s\"", |
| 355 | get_canonical_hostname(options.reverse_mapping_check)); |
| 356 | pam_retval = pam_set_item(pamh, PAM_RHOST, |
| 357 | get_canonical_hostname(options.reverse_mapping_check)); |
| 358 | if (pam_retval != PAM_SUCCESS) |
| 359 | fatal("PAM set rhost failed[%d]: %.200s", pam_retval, |
| 360 | PAM_STRERROR(pamh, pam_retval)); |
Damien Miller | 4e99720 | 2000-07-09 21:21:52 +1000 | [diff] [blame] | 361 | #ifdef PAM_TTY_KLUDGE |
Damien Miller | c19fd5f | 2000-06-22 21:44:54 +1000 | [diff] [blame] | 362 | /* |
| 363 | * Some PAM modules (e.g. pam_time) require a TTY to operate, |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 364 | * 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] | 365 | * sshd doesn't set the tty until too late in the auth process and may |
| 366 | * not even need one (for tty-less connections) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 367 | * Kludge: Set a fake PAM_TTY |
Damien Miller | c19fd5f | 2000-06-22 21:44:54 +1000 | [diff] [blame] | 368 | */ |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 369 | pam_retval = pam_set_item(pamh, PAM_TTY, "ssh"); |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 370 | if (pam_retval != PAM_SUCCESS) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 371 | fatal("PAM set tty failed[%d]: %.200s", |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 372 | pam_retval, PAM_STRERROR(pamh, pam_retval)); |
Damien Miller | 4e99720 | 2000-07-09 21:21:52 +1000 | [diff] [blame] | 373 | #endif /* PAM_TTY_KLUDGE */ |
Damien Miller | 7b22d65 | 2000-06-18 14:07:04 +1000 | [diff] [blame] | 374 | |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 375 | fatal_add_cleanup(&pam_cleanup_proc, NULL); |
| 376 | } |
| 377 | |
| 378 | /* Return list of PAM enviornment strings */ |
| 379 | char **fetch_pam_environment(void) |
| 380 | { |
Damien Miller | 1bead33 | 2000-04-30 00:47:29 +1000 | [diff] [blame] | 381 | #ifdef HAVE_PAM_GETENVLIST |
Damien Miller | 9d5705a | 2000-09-16 16:09:27 +1100 | [diff] [blame] | 382 | return(pam_getenvlist(pamh)); |
Damien Miller | 1bead33 | 2000-04-30 00:47:29 +1000 | [diff] [blame] | 383 | #else /* HAVE_PAM_GETENVLIST */ |
| 384 | return(NULL); |
| 385 | #endif /* HAVE_PAM_GETENVLIST */ |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 386 | } |
| 387 | |
| 388 | /* Print any messages that have been generated during authentication */ |
| 389 | /* or account checking to stderr */ |
| 390 | void print_pam_messages(void) |
| 391 | { |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 392 | if (pam_msg != NULL) |
Damien Miller | f9b625c | 2000-07-09 22:42:32 +1000 | [diff] [blame] | 393 | fputs(pam_msg, stderr); |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 394 | } |
| 395 | |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 396 | /* Append a message to buffer */ |
| 397 | void message_cat(char **p, const char *a) |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 398 | { |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 399 | char *cp; |
| 400 | size_t new_len; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 401 | |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 402 | new_len = strlen(a); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 403 | |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 404 | if (*p) { |
| 405 | size_t len = strlen(*p); |
Damien Miller | 2f6a0ad | 2000-05-31 11:20:11 +1000 | [diff] [blame] | 406 | |
Damien Miller | 63dc3e9 | 2001-02-07 12:58:33 +1100 | [diff] [blame] | 407 | *p = xrealloc(*p, new_len + len + 2); |
| 408 | cp = *p + len; |
| 409 | } else |
| 410 | *p = cp = xmalloc(new_len + 2); |
| 411 | |
| 412 | memcpy(cp, a, new_len); |
| 413 | cp[new_len] = '\n'; |
| 414 | cp[new_len + 1] = '\0'; |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 415 | } |
| 416 | |
| 417 | #endif /* USE_PAM */ |