1 /* $NetBSD: pam_start.c,v 1.4 2023/06/30 21:46:21 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 2002-2003 Networks Associates Technology, Inc. 5 * Copyright (c) 2004-2011 Dag-Erling Smørgrav 6 * All rights reserved. 7 * 8 * This software was developed for the FreeBSD Project by ThinkSec AS and 9 * Network Associates Laboratories, the Security Research Division of 10 * Network Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 11 * ("CBOSS"), as part of the DARPA CHATS research program. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. The name of the author may not be used to endorse or promote 22 * products derived from this software without specific prior written 23 * permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 */ 37 38 #ifdef HAVE_CONFIG_H 39 # include "config.h" 40 #endif 41 42 #include <sys/cdefs.h> 43 __RCSID("$NetBSD: pam_start.c,v 1.4 2023/06/30 21:46:21 christos Exp $"); 44 45 #include <stdlib.h> 46 #include <string.h> 47 #include <unistd.h> 48 49 #include <security/pam_appl.h> 50 51 #include "openpam_impl.h" 52 #include "openpam_strlcpy.h" 53 54 55 /* 56 * XSSO 4.2.1 57 * XSSO 6 page 89 58 * 59 * Initiate a PAM transaction 60 */ 61 62 int 63 pam_start(const char *service, 64 const char *user, 65 const struct pam_conv *pam_conv, 66 pam_handle_t **pamh) 67 { 68 char *hostname = NULL; 69 struct pam_handle *ph; 70 int r; 71 size_t hostname_size; 72 long h; 73 74 #ifdef _SC_HOST_NAME_MAX 75 h = sysconf(_SC_HOST_NAME_MAX); 76 #else 77 h = -1; 78 #endif 79 hostname_size = (size_t)(h < 10 ? 1024 : h) + 1; 80 81 ENTER(); 82 if ((ph = calloc((size_t)1, sizeof *ph)) == NULL) 83 RETURNC(PAM_BUF_ERR); 84 if ((r = pam_set_item(ph, PAM_SERVICE, service)) != PAM_SUCCESS) 85 goto fail; 86 if ((hostname = malloc(hostname_size)) == NULL) 87 goto fail; 88 if (gethostname(hostname, hostname_size) != 0) 89 strlcpy(hostname, "localhost", hostname_size); 90 if ((r = pam_set_item(ph, PAM_HOST, hostname)) != PAM_SUCCESS) 91 goto fail; 92 if ((r = pam_set_item(ph, PAM_USER, user)) != PAM_SUCCESS) 93 goto fail; 94 if ((r = pam_set_item(ph, PAM_CONV, pam_conv)) != PAM_SUCCESS) 95 goto fail; 96 if ((r = openpam_configure(ph, service)) != PAM_SUCCESS) 97 goto fail; 98 free(hostname); 99 *pamh = ph; 100 openpam_log(PAM_LOG_DEBUG, "pam_start(\"%s\") succeeded", service); 101 RETURNC(PAM_SUCCESS); 102 fail: 103 free(hostname); 104 pam_end(ph, r); 105 RETURNC(r); 106 } 107 108 /* 109 * Error codes: 110 * 111 * =openpam_configure 112 * =pam_set_item 113 * !PAM_SYMBOL_ERR 114 * PAM_BUF_ERR 115 */ 116 117 /** 118 * The =pam_start function creates and initializes a PAM context. 119 * 120 * The =service argument specifies the name of the policy to apply, and is 121 * stored in the =PAM_SERVICE item in the created context. 122 * 123 * The =user argument specifies the name of the target user - the user the 124 * created context will serve to authenticate. 125 * It is stored in the =PAM_USER item in the created context. 126 * 127 * The =pam_conv argument points to a =struct pam_conv describing the 128 * conversation function to use; see =pam_conv for details. 129 * 130 * >pam_get_item 131 * >pam_set_item 132 * >pam_end 133 */ 134