9b514ed83c
ensured that crypt("", "") would return "", which supported matcing
empty encrypted passwords with no additional code. Some modern
versions of crypt() (such as glibc) return NULL on error so we need
an explicit test to match an empty plaintext password and an empty
encrypted password.
125 lines
3.6 KiB
C
125 lines
3.6 KiB
C
/*
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* Copyright (c) 1999-2005, 2010-2015 Todd C. Miller <Todd.Miller@courtesan.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* Sponsored in part by the Defense Advanced Research Projects
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* Agency (DARPA) and Air Force Research Laboratory, Air Force
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* Materiel Command, USAF, under agreement number F39502-99-1-0512.
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*/
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#include <config.h>
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#include <sys/types.h>
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#include <stdio.h>
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#ifdef STDC_HEADERS
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# include <stdlib.h>
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# include <stddef.h>
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#else
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# ifdef HAVE_STDLIB_H
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# include <stdlib.h>
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# endif
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#endif /* STDC_HEADERS */
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#ifdef HAVE_STRING_H
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# include <string.h>
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#endif /* HAVE_STRING_H */
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#ifdef HAVE_STRINGS_H
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# include <strings.h>
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#endif /* HAVE_STRINGS_H */
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif /* HAVE_UNISTD_H */
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#include <pwd.h>
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#include "sudoers.h"
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#include "sudo_auth.h"
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#define DESLEN 13
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#define HAS_AGEINFO(p, l) (l == 18 && p[DESLEN] == ',')
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int
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sudo_passwd_init(struct passwd *pw, sudo_auth *auth)
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{
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debug_decl(sudo_passwd_init, SUDOERS_DEBUG_AUTH)
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#ifdef HAVE_SKEYACCESS
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if (skeyaccess(pw, user_tty, NULL, NULL) == 0)
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debug_return_int(AUTH_FAILURE);
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#endif
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sudo_setspent();
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auth->data = sudo_getepw(pw);
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sudo_endspent();
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debug_return_int(AUTH_SUCCESS);
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}
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int
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sudo_passwd_verify(struct passwd *pw, char *pass, sudo_auth *auth)
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{
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char sav, *epass;
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char *pw_epasswd = auth->data;
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size_t pw_len;
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int matched = 0;
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debug_decl(sudo_passwd_verify, SUDOERS_DEBUG_AUTH)
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/* An empty plain-text password must match an empty encrypted password. */
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if (pass[0] == '\0')
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debug_return_int(pw_epasswd[0] ? AUTH_FAILURE : AUTH_SUCCESS);
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#ifdef HAVE_GETAUTHUID
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/* Ultrix shadow passwords may use crypt16() */
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epass = (char *) crypt16(pass, pw_epasswd);
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if (epass != NULL && strcmp(pw_epasswd, epass) == 0)
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debug_return_int(AUTH_SUCCESS);
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#endif /* HAVE_GETAUTHUID */
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/*
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* Truncate to 8 chars if standard DES since not all crypt()'s do this.
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* If this turns out not to be safe we will have to use OS #ifdef's (sigh).
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*/
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sav = pass[8];
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pw_len = strlen(pw_epasswd);
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if (pw_len == DESLEN || HAS_AGEINFO(pw_epasswd, pw_len))
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pass[8] = '\0';
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/*
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* Normal UN*X password check.
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* HP-UX may add aging info (separated by a ',') at the end so
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* only compare the first DESLEN characters in that case.
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*/
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epass = (char *) crypt(pass, pw_epasswd);
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pass[8] = sav;
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if (epass != NULL) {
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if (HAS_AGEINFO(pw_epasswd, pw_len) && strlen(epass) == DESLEN)
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matched = !strncmp(pw_epasswd, epass, DESLEN);
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else
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matched = !strcmp(pw_epasswd, epass);
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}
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debug_return_int(matched ? AUTH_SUCCESS : AUTH_FAILURE);
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}
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int
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sudo_passwd_cleanup(pw, auth)
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struct passwd *pw;
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sudo_auth *auth;
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{
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char *pw_epasswd = auth->data;
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debug_decl(sudo_passwd_cleanup, SUDOERS_DEBUG_AUTH)
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if (pw_epasswd != NULL) {
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memset_s(pw_epasswd, SUDO_CONV_REPL_MAX, 0, strlen(pw_epasswd));
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sudo_efree(pw_epasswd);
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}
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debug_return_int(AUTH_SUCCESS);
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}
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