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Annotation of embedaddon/sudo/plugins/sudoers/auth/passwd.c, revision 1.1.1.4

1.1       misho       1: /*
1.1.1.3   misho       2:  * Copyright (c) 1999-2005, 2010-2013 Todd C. Miller <Todd.Miller@courtesan.com>
1.1       misho       3:  *
                      4:  * Permission to use, copy, modify, and distribute this software for any
                      5:  * purpose with or without fee is hereby granted, provided that the above
                      6:  * copyright notice and this permission notice appear in all copies.
                      7:  *
                      8:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
                      9:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
                     10:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
                     11:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     12:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
                     13:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
                     14:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
                     15:  *
                     16:  * Sponsored in part by the Defense Advanced Research Projects
                     17:  * Agency (DARPA) and Air Force Research Laboratory, Air Force
                     18:  * Materiel Command, USAF, under agreement number F39502-99-1-0512.
                     19:  */
                     20: 
                     21: #include <config.h>
                     22: 
                     23: #include <sys/types.h>
                     24: #include <stdio.h>
                     25: #ifdef STDC_HEADERS
                     26: # include <stdlib.h>
                     27: # include <stddef.h>
                     28: #else
                     29: # ifdef HAVE_STDLIB_H
                     30: #  include <stdlib.h>
                     31: # endif
                     32: #endif /* STDC_HEADERS */
                     33: #ifdef HAVE_STRING_H
                     34: # include <string.h>
                     35: #endif /* HAVE_STRING_H */
                     36: #ifdef HAVE_STRINGS_H
                     37: # include <strings.h>
                     38: #endif /* HAVE_STRINGS_H */
                     39: #ifdef HAVE_UNISTD_H
                     40: # include <unistd.h>
                     41: #endif /* HAVE_UNISTD_H */
                     42: #include <pwd.h>
                     43: 
                     44: #include "sudoers.h"
                     45: #include "sudo_auth.h"
                     46: 
                     47: #define DESLEN                 13
                     48: #define HAS_AGEINFO(p, l)      (l == 18 && p[DESLEN] == ',')
                     49: 
                     50: int
1.1.1.2   misho      51: sudo_passwd_init(struct passwd *pw, sudo_auth *auth)
1.1       misho      52: {
1.1.1.2   misho      53:     debug_decl(sudo_passwd_init, SUDO_DEBUG_AUTH)
                     54: 
1.1       misho      55: #ifdef HAVE_SKEYACCESS
                     56:     if (skeyaccess(pw, user_tty, NULL, NULL) == 0)
1.1.1.2   misho      57:        debug_return_int(AUTH_FAILURE);
1.1       misho      58: #endif
                     59:     sudo_setspent();
                     60:     auth->data = sudo_getepw(pw);
                     61:     sudo_endspent();
1.1.1.2   misho      62:     debug_return_int(AUTH_SUCCESS);
1.1       misho      63: }
                     64: 
                     65: int
1.1.1.2   misho      66: sudo_passwd_verify(struct passwd *pw, char *pass, sudo_auth *auth)
1.1       misho      67: {
                     68:     char sav, *epass;
                     69:     char *pw_epasswd = auth->data;
                     70:     size_t pw_len;
1.1.1.3   misho      71:     int matched = 0;
1.1.1.2   misho      72:     debug_decl(sudo_passwd_verify, SUDO_DEBUG_AUTH)
1.1       misho      73: 
                     74:     pw_len = strlen(pw_epasswd);
                     75: 
                     76: #ifdef HAVE_GETAUTHUID
                     77:     /* Ultrix shadow passwords may use crypt16() */
1.1.1.3   misho      78:     epass = (char *) crypt16(pass, pw_epasswd);
                     79:     if (epass != NULL && strcmp(pw_epasswd, epass) == 0)
1.1.1.2   misho      80:        debug_return_int(AUTH_SUCCESS);
1.1       misho      81: #endif /* HAVE_GETAUTHUID */
                     82: 
                     83:     /*
                     84:      * Truncate to 8 chars if standard DES since not all crypt()'s do this.
                     85:      * If this turns out not to be safe we will have to use OS #ifdef's (sigh).
                     86:      */
                     87:     sav = pass[8];
                     88:     if (pw_len == DESLEN || HAS_AGEINFO(pw_epasswd, pw_len))
                     89:        pass[8] = '\0';
                     90: 
                     91:     /*
                     92:      * Normal UN*X password check.
                     93:      * HP-UX may add aging info (separated by a ',') at the end so
                     94:      * only compare the first DESLEN characters in that case.
                     95:      */
                     96:     epass = (char *) crypt(pass, pw_epasswd);
                     97:     pass[8] = sav;
1.1.1.3   misho      98:     if (epass != NULL) {
                     99:        if (HAS_AGEINFO(pw_epasswd, pw_len) && strlen(epass) == DESLEN)
                    100:            matched = !strncmp(pw_epasswd, epass, DESLEN);
                    101:        else
                    102:            matched = !strcmp(pw_epasswd, epass);
                    103:     }
1.1       misho     104: 
1.1.1.3   misho     105:     debug_return_int(matched ? AUTH_SUCCESS : AUTH_FAILURE);
1.1       misho     106: }
                    107: 
                    108: int
1.1.1.2   misho     109: sudo_passwd_cleanup(pw, auth)
1.1       misho     110:     struct passwd *pw;
                    111:     sudo_auth *auth;
                    112: {
                    113:     char *pw_epasswd = auth->data;
1.1.1.2   misho     114:     debug_decl(sudo_passwd_cleanup, SUDO_DEBUG_AUTH)
1.1       misho     115: 
                    116:     if (pw_epasswd != NULL) {
1.1.1.4 ! misho     117:        memset_s(pw_epasswd, SUDO_CONV_REPL_MAX, 0, strlen(pw_epasswd));
1.1       misho     118:        efree(pw_epasswd);
                    119:     }
1.1.1.2   misho     120:     debug_return_int(AUTH_SUCCESS);
1.1       misho     121: }