1 /*
2  * Copyright (c) 2005 The SCO Group. All rights reserved.
3  * Copyright (c) 2005 Tim Rice. All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24  */
25 
26 #include "includes.h"
27 
28 #if defined(HAVE_LIBIAF)  &&  !defined(HAVE_SECUREWARE)
29 #include <sys/types.h>
30 #ifdef HAVE_CRYPT_H
31 # include <crypt.h>
32 #endif
33 #include <pwd.h>
34 #include <stdarg.h>
35 #include <stdlib.h>
36 #include <stdio.h>
37 #include <string.h>
38 
39 #include "xmalloc.h"
40 #include "packet.h"
41 #include "auth-options.h"
42 #include "log.h"
43 #include "misc.h"	/* servconf.h needs misc.h for struct ForwardOptions */
44 #include "servconf.h"
45 #include "hostfile.h"
46 #include "auth.h"
47 #include "ssh.h"
48 #include "ssh_api.h"
49 
50 int nischeck(char *);
51 
52 int
sys_auth_passwd(struct ssh * ssh,const char * password)53 sys_auth_passwd(struct ssh *ssh, const char *password)
54 {
55 	Authctxt *authctxt = ssh->authctxt;
56 	struct passwd *pw = authctxt->pw;
57 	char *salt;
58 	int result;
59 
60 	/* Just use the supplied fake password if authctxt is invalid */
61 	char *pw_password = authctxt->valid ? shadow_pw(pw) : pw->pw_passwd;
62 
63 	if (pw_password == NULL)
64 		return 0;
65 
66 	/* Check for users with no password. */
67 	if (strcmp(pw_password, "") == 0 && strcmp(password, "") == 0)
68 		return (1);
69 
70 	/* Encrypt the candidate password using the proper salt. */
71 	salt = (pw_password[0] && pw_password[1]) ? pw_password : "xx";
72 
73 	/*
74 	 * Authentication is accepted if the encrypted passwords
75 	 * are identical.
76 	 */
77 #ifdef UNIXWARE_LONG_PASSWORDS
78 	if (!nischeck(pw->pw_name)) {
79 		result = ((strcmp(bigcrypt(password, salt), pw_password) == 0)
80 		||  (strcmp(osr5bigcrypt(password, salt), pw_password) == 0));
81 	}
82 	else
83 #endif /* UNIXWARE_LONG_PASSWORDS */
84 		result = (strcmp(xcrypt(password, salt), pw_password) == 0);
85 
86 #ifdef USE_LIBIAF
87 	if (authctxt->valid)
88 		free(pw_password);
89 #endif
90 	return(result);
91 }
92 
93 #ifdef UNIXWARE_LONG_PASSWORDS
94 int
nischeck(char * namep)95 nischeck(char *namep)
96 {
97 	char password_file[] = "/etc/passwd";
98 	FILE *fd;
99 	struct passwd *ent = NULL;
100 
101 	if ((fd = fopen (password_file, "r")) == NULL) {
102 		/*
103 		 * If the passwd file has disappeared we are in a bad state.
104 		 * However, returning 0 will send us back through the
105 		 * authentication scheme that has checked the ia database for
106 		 * passwords earlier.
107 		 */
108 		return(0);
109 	}
110 
111 	/*
112 	 * fgetpwent() only reads from password file, so we know for certain
113 	 * that the user is local.
114 	 */
115 	while (ent = fgetpwent(fd)) {
116 		if (strcmp (ent->pw_name, namep) == 0) {
117 			/* Local user */
118 			fclose (fd);
119 			return(0);
120 		}
121 	}
122 
123 	fclose (fd);
124 	return (1);
125 }
126 
127 #endif /* UNIXWARE_LONG_PASSWORDS */
128 
129 /*
130 	NOTE: ia_get_logpwd() allocates memory for arg 2
131 	functions that call shadow_pw() will need to free
132  */
133 
134 #ifdef USE_LIBIAF
135 char *
get_iaf_password(struct passwd * pw)136 get_iaf_password(struct passwd *pw)
137 {
138 	char *pw_password = NULL;
139 
140 	uinfo_t uinfo;
141 	if (!ia_openinfo(pw->pw_name,&uinfo)) {
142 		ia_get_logpwd(uinfo, &pw_password);
143 		if (pw_password == NULL)
144 			fatal("ia_get_logpwd: Unable to get the shadow passwd");
145 		ia_closeinfo(uinfo);
146 	 	return pw_password;
147 	}
148 	else
149 		fatal("ia_openinfo: Unable to open the shadow passwd file");
150 }
151 #endif /* USE_LIBIAF */
152 #endif /* HAVE_LIBIAF and not HAVE_SECUREWARE */
153 
154