mirror of
git://git.gnu.org.ua/pam-modules.git
synced 2025-04-26 00:19:52 +03:00
381 lines
8.2 KiB
C
381 lines
8.2 KiB
C
/* This file is part of pam-modules.
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Copyright (C) 2005, 2006 Sergey Poznyakoff
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 3 of the License, or (at your
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option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program. If not, see <http://www.gnu.org/licenses/>. */
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#if defined(HAVE_CONFIG_H)
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# include <config.h>
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#endif
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#ifdef HAVE__PAM_ACONF_H
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#include <security/_pam_aconf.h>
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <string.h>
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#include <unistd.h>
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#include <mysql/mysql.h>
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#include "pam_sql.c"
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#include "sha1.h"
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#include "sha1.c"
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static char *
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sql_expand_query (MYSQL *mysql,
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const char *query, const char *user, const char *pass)
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{
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char *p, *q, *res;
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int len;
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char *esc_user = NULL;
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char *esc_pass = NULL;
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if (!query)
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return NULL;
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/* Compute resulting query length */
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for (len = 0, p = (char *) query; *p; ) {
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if (*p == '%') {
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if (p[1] == 'u') {
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int size = 2*strlen(user)+1;
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esc_user = malloc(size);
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if (!esc_user)
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return NULL;
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mysql_real_escape_string(mysql,
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esc_user,
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user, size);
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len += strlen (esc_user);
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p += 2;
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} if (p[1] == 'p') {
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int size = 2*strlen(pass)+1;
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esc_pass = malloc(len);
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if (!esc_pass)
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return NULL;
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mysql_real_escape_string(mysql,
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esc_pass,
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pass, size);
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len += strlen (esc_pass);
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p += 2;
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} else if (p[1] == '%') {
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len++;
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p += 2;
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} else {
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len++;
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p++;
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}
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} else {
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len++;
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p++;
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}
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}
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res = malloc (len + 1);
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if (!res) {
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free (esc_user);
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free (esc_pass);
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return res;
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}
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for (p = (char *) query, q = res; *p; ) {
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if (*p == '%') {
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switch (*++p) {
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case 'u':
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strcpy (q, esc_user);
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q += strlen (q);
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p++;
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break;
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case 'p':
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strcpy (q, esc_pass);
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q += strlen (q);
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p++;
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break;
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case '%':
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*q++ = *p++;
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break;
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default:
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*q++ = *p++;
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}
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} else
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*q++ = *p++;
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}
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*q = 0;
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free (esc_user);
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free (esc_pass);
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return res;
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}
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/* MySQL scrambled password support */
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/* Convert a single hex digit to corresponding number */
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static unsigned
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digit_to_number (char c)
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{
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return (unsigned) (c >= '0' && c <= '9' ? c-'0' :
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c >= 'A' && c <= 'Z' ? c-'A'+10 :
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c-'a'+10);
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}
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/* Extract salt value from MySQL scrambled password.
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WARNING: The code assumes that
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1. strlen (password) % 8 == 0
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2. number_of_entries (RES) = strlen (password) / 8
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For MySQL >= 3.21, strlen(password) == 16 */
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static void
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get_salt_from_scrambled (unsigned long *res, const char *password)
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{
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res[0] = res[1] = 0;
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while (*password) {
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unsigned long val = 0;
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unsigned i;
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for (i = 0; i < 8 ; i++)
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val = (val << 4) + digit_to_number (*password++);
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*res++ = val;
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}
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}
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/* Scramble a plaintext password */
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static void
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scramble_password (unsigned long *result, const char *password)
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{
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unsigned long nr = 1345345333L, add = 7, nr2 = 0x12345671L;
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unsigned long tmp;
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for (; *password ; password++) {
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if (*password == ' ' || *password == '\t')
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continue;
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tmp = (unsigned long) (unsigned char) *password;
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nr ^= (((nr & 63) + add) * tmp)+ (nr << 8);
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nr2 += (nr2 << 8) ^ nr;
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add += tmp;
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}
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result[0] = nr & (((unsigned long) 1L << 31) -1L);
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result[1] = nr2 & (((unsigned long) 1L << 31) -1L);
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}
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static void
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octet2hex (char *to, const unsigned char *str, unsigned len)
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{
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const unsigned char *str_end= str + len;
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static char d[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
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for ( ; str != str_end; ++str) {
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*to++ = d[(*str & 0xF0) >> 4];
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*to++ = d[*str & 0x0F];
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}
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*to= '\0';
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}
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#define SHA1_HASH_SIZE 20
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static int
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make_mysql_4x_password (char *to, const char *message)
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{
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SHA1_CTX sha1_context;
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unsigned char hash_stage2[SHA1_HASH_SIZE];
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/* stage 1: hash password */
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SHA1Init(&sha1_context);
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SHA1Update(&sha1_context, message, strlen (message));
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SHA1Final(to, &sha1_context);
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/* stage 2: hash stage1 output */
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SHA1Init(&sha1_context);
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SHA1Update(&sha1_context, to, SHA1_HASH_SIZE);
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SHA1Final(hash_stage2, &sha1_context);
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/* convert hash_stage2 to hex string */
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*to++ = '*';
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octet2hex (to, hash_stage2, SHA1_HASH_SIZE);
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}
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static int
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mu_check_mysql_4x_password (const char *scrambled, const char *message)
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{
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char to[2*SHA1_HASH_SIZE + 2];
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make_mysql_4x_password (to, message);
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/* Compare both strings */
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return memcmp (to, scrambled, strlen (scrambled));
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}
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/* Check whether a plaintext password MESSAGE matches MySQL scrambled password
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PASSWORD */
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static int
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mu_check_mysql_scrambled_password (const char *scrambled, const char *message)
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{
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unsigned long hash_pass[2], hash_message[2];
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char buf[17];
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if (strlen (scrambled) < 16)
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return 1;
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if (strlen (scrambled) > 16) {
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const char *p;
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/* Try to normalize it by cutting off trailing whitespace */
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for (p = scrambled + strlen (scrambled) - 1;
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p > scrambled && isspace (*p); p--)
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;
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if (p - scrambled != 15)
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return 1;
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memcpy (buf, scrambled, 16);
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buf[17] = 0;
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scrambled = buf;
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}
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get_salt_from_password (hash_pass, scrambled);
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scramble_password (hash_message, message);
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return !(hash_message[0] == hash_pass[0]
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&& hash_message[1] == hash_pass[1]);
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}
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static int
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check_mysql_pass(const char *sqlpass, const char *userpass)
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{
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if (mu_check_mysql_4x_password(sqlpass, userpass) == 0
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|| mu_check_mysql_scrambled_password (sqlpass, userpass) == 0)
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return PAM_SUCCESS;
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else
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return PAM_AUTH_ERR;
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}
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static int
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check_query_result(MYSQL *mysql, const char *pass)
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{
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MYSQL_RES *result;
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int rc = PAM_AUTH_ERR;
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result = mysql_store_result(mysql);
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if (!result) {
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_pam_err(LOG_ERR, "MySQL: query returned 0 tuples");
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rc = PAM_AUTH_ERR;
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} else {
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MYSQL_ROW row;
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long n = mysql_num_rows(result);
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if (n != 1) {
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_pam_err(LOG_WARNING,
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"MySQL: query returned %d tuples", n);
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if (n == 0) {
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mysql_free_result(result);
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return PAM_AUTH_ERR;
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}
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}
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n = mysql_num_fields(result);
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if (n != 1) {
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_pam_err(LOG_WARNING,
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"MySQL: query returned %d fields", n);
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}
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row = mysql_fetch_row(result);
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chop(row[0]);
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DEBUG(100,("Obtained password value: %s", row[0]));
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if (strcmp(row[0], crypt(pass, row[0])) == 0)
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rc = PAM_SUCCESS;
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if (rc != PAM_SUCCESS
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&& check_boolean_config ("allow-mysql-pass", 1))
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rc = check_mysql_pass (row[0], pass);
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if (rc != PAM_SUCCESS
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&& check_boolean_config ("allow-plaintext-pass", 0)) {
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if (strcmp (row[0], pass) == 0)
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rc = PAM_SUCCESS;
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}
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}
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mysql_free_result(result);
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return rc;
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}
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static int
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verify_user_pass(const char *username, const char *password)
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{
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MYSQL mysql;
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char *socket_path = NULL;
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char *hostname;
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char *login;
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char *pass;
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char *db;
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char *port;
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int portno;
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char *query, *exquery;
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char *p;
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MYSQL_RES *result;
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int rc;
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hostname = find_config("host");
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CHKVAR(hostname);
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if (hostname[0] == '/') {
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socket_path = hostname;
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hostname = "localhost";
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}
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port = find_config("port");
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CHKVAR(port);
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portno = strtoul (port, &p, 0);
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if (*p) {
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_pam_err(LOG_ERR, "Invalid port number: %s", port);
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return PAM_SERVICE_ERR;
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}
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login = find_config("login");
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CHKVAR(login);
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pass = find_config("pass");
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CHKVAR(pass);
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db = find_config("db");
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CHKVAR(db);
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query = find_config("query");
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CHKVAR(query);
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exquery = sql_expand_query (&mysql, query, username, password);
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if (!exquery) {
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_pam_err(LOG_ERR, "cannot expand query");
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return PAM_SERVICE_ERR;
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}
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mysql_init(&mysql);
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if (!mysql_real_connect(&mysql, hostname,
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login, pass, db,
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portno, socket_path, 0)) {
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_pam_err(LOG_ERR, "cannot connect to MySQL");
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mysql_close(&mysql);
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free(exquery);
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return PAM_SERVICE_ERR;
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}
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if (mysql_query(&mysql, exquery)) {
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_pam_err(LOG_ERR, "MySQL: %s", mysql_error(&mysql));
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mysql_close(&mysql);
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free(exquery);
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return PAM_SERVICE_ERR;
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}
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free(exquery);
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rc = check_query_result(&mysql, password);
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mysql_close(&mysql);
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return rc;
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}
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