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Annotation of embedaddon/sudo/plugins/sudoers/auth/passwd.c, revision 1.1.1.1

1.1       misho       1: /*
                      2:  * Copyright (c) 1999-2005, 2010-2011 Todd C. Miller <Todd.Miller@courtesan.com>
                      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 <sys/param.h>
                     25: #include <stdio.h>
                     26: #ifdef STDC_HEADERS
                     27: # include <stdlib.h>
                     28: # include <stddef.h>
                     29: #else
                     30: # ifdef HAVE_STDLIB_H
                     31: #  include <stdlib.h>
                     32: # endif
                     33: #endif /* STDC_HEADERS */
                     34: #ifdef HAVE_STRING_H
                     35: # include <string.h>
                     36: #endif /* HAVE_STRING_H */
                     37: #ifdef HAVE_STRINGS_H
                     38: # include <strings.h>
                     39: #endif /* HAVE_STRINGS_H */
                     40: #ifdef HAVE_UNISTD_H
                     41: # include <unistd.h>
                     42: #endif /* HAVE_UNISTD_H */
                     43: #include <pwd.h>
                     44: 
                     45: #include "sudoers.h"
                     46: #include "sudo_auth.h"
                     47: 
                     48: #define DESLEN                 13
                     49: #define HAS_AGEINFO(p, l)      (l == 18 && p[DESLEN] == ',')
                     50: 
                     51: int
                     52: passwd_init(struct passwd *pw, sudo_auth *auth)
                     53: {
                     54: #ifdef HAVE_SKEYACCESS
                     55:     if (skeyaccess(pw, user_tty, NULL, NULL) == 0)
                     56:        return AUTH_FAILURE;
                     57: #endif
                     58:     sudo_setspent();
                     59:     auth->data = sudo_getepw(pw);
                     60:     sudo_endspent();
                     61:     return AUTH_SUCCESS;
                     62: }
                     63: 
                     64: int
                     65: passwd_verify(struct passwd *pw, char *pass, sudo_auth *auth)
                     66: {
                     67:     char sav, *epass;
                     68:     char *pw_epasswd = auth->data;
                     69:     size_t pw_len;
                     70:     int error;
                     71: 
                     72:     pw_len = strlen(pw_epasswd);
                     73: 
                     74: #ifdef HAVE_GETAUTHUID
                     75:     /* Ultrix shadow passwords may use crypt16() */
                     76:     error = strcmp(pw_epasswd, (char *) crypt16(pass, pw_epasswd));
                     77:     if (!error)
                     78:        return AUTH_SUCCESS;
                     79: #endif /* HAVE_GETAUTHUID */
                     80: 
                     81:     /*
                     82:      * Truncate to 8 chars if standard DES since not all crypt()'s do this.
                     83:      * If this turns out not to be safe we will have to use OS #ifdef's (sigh).
                     84:      */
                     85:     sav = pass[8];
                     86:     if (pw_len == DESLEN || HAS_AGEINFO(pw_epasswd, pw_len))
                     87:        pass[8] = '\0';
                     88: 
                     89:     /*
                     90:      * Normal UN*X password check.
                     91:      * HP-UX may add aging info (separated by a ',') at the end so
                     92:      * only compare the first DESLEN characters in that case.
                     93:      */
                     94:     epass = (char *) crypt(pass, pw_epasswd);
                     95:     pass[8] = sav;
                     96:     if (HAS_AGEINFO(pw_epasswd, pw_len) && strlen(epass) == DESLEN)
                     97:        error = strncmp(pw_epasswd, epass, DESLEN);
                     98:     else
                     99:        error = strcmp(pw_epasswd, epass);
                    100: 
                    101:     return error ? AUTH_FAILURE : AUTH_SUCCESS;
                    102: }
                    103: 
                    104: int
                    105: passwd_cleanup(pw, auth)
                    106:     struct passwd *pw;
                    107:     sudo_auth *auth;
                    108: {
                    109:     char *pw_epasswd = auth->data;
                    110: 
                    111:     if (pw_epasswd != NULL) {
                    112:        zero_bytes(pw_epasswd, strlen(pw_epasswd));
                    113:        efree(pw_epasswd);
                    114:     }
                    115:     return AUTH_SUCCESS;
                    116: }