1 /*- 2 * Copyright (c) 2002-2003 Networks Associates Technology, Inc. 3 * Copyright (c) 2004-2023 Dag-Erling Smørgrav 4 * All rights reserved. 5 * 6 * This software was developed for the FreeBSD Project by ThinkSec AS and 7 * Network Associates Laboratories, the Security Research Division of 8 * Network Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 9 * ("CBOSS"), as part of the DARPA CHATS research program. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. The name of the author may not be used to endorse or promote 20 * products derived from this software without specific prior written 21 * permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #ifdef HAVE_CONFIG_H 37 # include "config.h" 38 #endif 39 40 #include <sys/param.h> 41 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 46 #include <security/pam_appl.h> 47 48 #include "openpam_impl.h" 49 #include "openpam_asprintf.h" 50 51 /* 52 * OpenPAM extension 53 * 54 * Sets the value of a module option 55 */ 56 57 int 58 openpam_set_option(pam_handle_t *pamh, 59 const char *option, 60 const char *value) 61 { 62 pam_chain_t *cur; 63 char *opt, **optv; 64 size_t len; 65 int i; 66 67 ENTERS(option); 68 if (pamh == NULL || pamh->current == NULL || option == NULL) 69 RETURNC(PAM_SYSTEM_ERR); 70 cur = pamh->current; 71 for (len = 0; option[len] != '\0'; ++len) 72 if (option[len] == '=') 73 break; 74 for (i = 0; i < cur->optc; ++i) { 75 if (strncmp(cur->optv[i], option, len) == 0 && 76 (cur->optv[i][len] == '\0' || cur->optv[i][len] == '=')) 77 break; 78 } 79 if (value == NULL) { 80 /* remove */ 81 if (i == cur->optc) 82 RETURNC(PAM_SUCCESS); 83 for (free(cur->optv[i]); i < cur->optc; ++i) 84 cur->optv[i] = cur->optv[i + 1]; 85 cur->optv[i] = NULL; 86 --cur->optc; 87 RETURNC(PAM_SUCCESS); 88 } 89 if (asprintf(&opt, "%.*s=%s", (int)len, option, value) < 0) 90 RETURNC(PAM_BUF_ERR); 91 if (i == cur->optc) { 92 /* add */ 93 optv = realloc(cur->optv, sizeof(char *) * (cur->optc + 2)); 94 if (optv == NULL) { 95 FREE(opt); 96 RETURNC(PAM_BUF_ERR); 97 } 98 optv[i] = opt; 99 optv[i + 1] = NULL; 100 cur->optv = optv; 101 ++cur->optc; 102 } else { 103 /* replace */ 104 FREE(cur->optv[i]); 105 cur->optv[i] = opt; 106 } 107 RETURNC(PAM_SUCCESS); 108 } 109 110 /* 111 * Error codes: 112 * 113 * PAM_SYSTEM_ERR 114 * PAM_BUF_ERR 115 */ 116 117 /** 118 * The =openpam_set_option function sets the specified option in the 119 * context of the currently executing service module. 120 * 121 * >openpam_get_option 122 */ 123