1 /* $NetBSD: pam_start.c,v 1.3 2017/05/06 19:50:10 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 * $OpenPAM: pam_start.c 938 2017-04-30 21:34:42Z des $ 38 */ 39 40 #ifdef HAVE_CONFIG_H 41 # include "config.h" 42 #endif 43 44 #include <sys/cdefs.h> 45 __RCSID("$NetBSD: pam_start.c,v 1.3 2017/05/06 19:50:10 christos Exp $"); 46 47 #include <stdlib.h> 48 #include <string.h> 49 #include <unistd.h> 50 51 #include <security/pam_appl.h> 52 53 #include "openpam_impl.h" 54 #include "openpam_strlcpy.h" 55 56 57 /* 58 * XSSO 4.2.1 59 * XSSO 6 page 89 60 * 61 * Initiate a PAM transaction 62 */ 63 64 int 65 pam_start(const char *service, 66 const char *user, 67 const struct pam_conv *pam_conv, 68 pam_handle_t **pamh) 69 { 70 char *hostname = NULL; 71 struct pam_handle *ph; 72 int r; 73 size_t hostname_size; 74 long h; 75 76 #ifdef _SC_HOST_NAME_MAX 77 h = sysconf(_SC_HOST_NAME_MAX); 78 #else 79 h = -1; 80 #endif 81 hostname_size = (size_t)(h < 10 ? 1024 : h) + 1; 82 83 ENTER(); 84 if ((ph = calloc((size_t)1, sizeof *ph)) == NULL) 85 RETURNC(PAM_BUF_ERR); 86 if ((r = pam_set_item(ph, PAM_SERVICE, service)) != PAM_SUCCESS) 87 goto fail; 88 if ((hostname = malloc(hostname_size)) == NULL) 89 goto fail; 90 if (gethostname(hostname, hostname_size) != 0) 91 strlcpy(hostname, "localhost", hostname_size); 92 if ((r = pam_set_item(ph, PAM_HOST, hostname)) != PAM_SUCCESS) 93 goto fail; 94 if ((r = pam_set_item(ph, PAM_USER, user)) != PAM_SUCCESS) 95 goto fail; 96 if ((r = pam_set_item(ph, PAM_CONV, pam_conv)) != PAM_SUCCESS) 97 goto fail; 98 if ((r = openpam_configure(ph, service)) != PAM_SUCCESS) 99 goto fail; 100 free(hostname); 101 *pamh = ph; 102 openpam_log(PAM_LOG_DEBUG, "pam_start(\"%s\") succeeded", service); 103 RETURNC(PAM_SUCCESS); 104 fail: 105 free(hostname); 106 pam_end(ph, r); 107 RETURNC(r); 108 } 109 110 /* 111 * Error codes: 112 * 113 * =openpam_configure 114 * =pam_set_item 115 * !PAM_SYMBOL_ERR 116 * PAM_BUF_ERR 117 */ 118 119 /** 120 * The =pam_start function creates and initializes a PAM context. 121 * 122 * The =service argument specifies the name of the policy to apply, and is 123 * stored in the =PAM_SERVICE item in the created context. 124 * 125 * The =user argument specifies the name of the target user - the user the 126 * created context will serve to authenticate. 127 * It is stored in the =PAM_USER item in the created context. 128 * 129 * The =pam_conv argument points to a =struct pam_conv describing the 130 * conversation function to use; see =pam_conv for details. 131 * 132 * >pam_get_item 133 * >pam_set_item 134 * >pam_end 135 */ 136