1 // system-level password checking for host auth mode
2 // by Nathan Bryant, March 1999
3 // updated by Trey van Riper, June 2005
5 // Copyright (c) 1999-2016 by the citadel.org team
7 // This program is open source software; you can redistribute it and/or modify
8 // it under the terms of the GNU General Public License, version 3.
10 // This program is distributed in the hope that it will be useful,
11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 // GNU General Public License for more details.
15 #if defined(__linux) || defined(__sun) // needed for crypt():
17 #define _XOPEN_SOURCE_EXTENDED 1
24 #include <sys/types.h>
34 #include <security/pam_appl.h>
36 // struct appdata: passed to the conversation function
42 // conv(): the PAM conversation function. this assumes that a
43 // PAM_PROMPT_ECHO_ON is asking for a username, and a PAM_PROMPT_ECHO_OFF is
44 // asking for a password. esoteric authentication modules will fail with this
45 // code, but we can't really support them with the existing client protocol
46 // anyway. the failure mode should be to deny access, in any case.
47 static int conv(int num_msg, const struct pam_message **msg, struct pam_response **resp, void *appdata_ptr) {
48 struct pam_response *temp_resp;
49 struct appdata *data = appdata_ptr;
52 malloc(sizeof(struct pam_response[num_msg]))) == NULL)
56 switch ((*msg)[num_msg].msg_style) {
57 case PAM_PROMPT_ECHO_ON:
58 temp_resp[num_msg].resp = strdup(data->name);
60 case PAM_PROMPT_ECHO_OFF:
61 temp_resp[num_msg].resp = strdup(data->pw);
64 temp_resp[num_msg].resp = NULL;
66 temp_resp[num_msg].resp_retcode = 0;
72 #endif // HAVE_PAM_START
75 // check that `pass' is the correct password for `uid'
76 // returns zero if no, nonzero if yes
77 int validate_password(uid_t uid, const char *pass) {
101 #ifdef PAM_DATA_SILENT
102 int flags = PAM_DATA_SILENT;
108 pc.appdata_ptr = &data;
109 data.name = pw->pw_name;
111 if (pam_start("citadel", pw->pw_name, &pc, &ph) != PAM_SUCCESS)
114 if ((i = pam_authenticate(ph, flags)) == PAM_SUCCESS) {
115 if ((i = pam_acct_mgmt(ph, flags)) == PAM_SUCCESS) {
120 pam_end(ph, i | flags);
122 crypted_pwd = pw->pw_passwd;
127 if (pw->pw_name == NULL)
129 if ((sp = getspnam(pw->pw_name)) != NULL) {
130 crypted_pwd = sp->sp_pwdp;
134 if (!strcmp(crypt(pass, crypted_pwd), crypted_pwd)) {
137 #endif // HAVE_PAM_START