2 * Copyright (c) 1997 - 2005 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the Institute nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include "krb5_locl.h"
37 /* see if principal is mentioned in the filename access file, return
38 TRUE (in result) if so, FALSE otherwise */
40 static krb5_error_code
41 check_one_file(krb5_context context
,
44 krb5_principal principal
,
54 f
= fopen (filename
, "r");
59 /* check type and mode of file */
60 if (fstat(fileno(f
), &st
) != 0) {
64 if (S_ISDIR(st
.st_mode
)) {
68 if (st
.st_uid
!= pwd
->pw_uid
&& st
.st_uid
!= 0) {
72 if ((st
.st_mode
& (S_IWGRP
| S_IWOTH
)) != 0) {
77 while (fgets (buf
, sizeof(buf
), f
) != NULL
) {
79 char *newline
= buf
+ strcspn(buf
, "\n");
81 if(*newline
!= '\n') {
85 while(c
!= EOF
&& c
!= '\n')
87 /* line was too long, so ignore it */
92 ret
= krb5_parse_name (context
, buf
, &tmp
);
95 *result
= krb5_principal_compare (context
, principal
, tmp
);
96 krb5_free_principal (context
, tmp
);
106 static krb5_error_code
107 check_directory(krb5_context context
,
110 krb5_principal principal
,
111 krb5_boolean
*result
)
115 char filename
[MAXPATHLEN
];
116 krb5_error_code ret
= 0;
121 if(lstat(dirname
, &st
) < 0)
124 if (!S_ISDIR(st
.st_mode
))
127 if (st
.st_uid
!= pwd
->pw_uid
&& st
.st_uid
!= 0)
129 if ((st
.st_mode
& (S_IWGRP
| S_IWOTH
)) != 0)
132 if((d
= opendir(dirname
)) == NULL
)
141 if(fstat(fd
, &st2
) < 0) {
145 if(st
.st_dev
!= st2
.st_dev
|| st
.st_ino
!= st2
.st_ino
) {
152 while((dent
= readdir(d
)) != NULL
) {
153 if(strcmp(dent
->d_name
, ".") == 0 ||
154 strcmp(dent
->d_name
, "..") == 0 ||
155 dent
->d_name
[0] == '#' || /* emacs autosave */
156 dent
->d_name
[strlen(dent
->d_name
) - 1] == '~') /* emacs backup */
158 snprintf(filename
, sizeof(filename
), "%s/%s", dirname
, dent
->d_name
);
159 ret
= check_one_file(context
, filename
, pwd
, principal
, result
);
160 if(ret
== 0 && *result
== TRUE
)
162 ret
= 0; /* don't propagate errors upstream */
169 match_local_principals(krb5_context context
,
170 krb5_principal principal
,
174 krb5_realm
*realms
, *r
;
175 krb5_boolean result
= FALSE
;
177 /* multi-component principals can never match */
178 if(krb5_principal_get_comp_string(context
, principal
, 1) != NULL
)
181 ret
= krb5_get_default_realms (context
, &realms
);
185 for (r
= realms
; *r
!= NULL
; ++r
) {
186 if(strcmp(krb5_principal_get_realm(context
, principal
),
189 if(strcmp(krb5_principal_get_comp_string(context
, principal
, 0),
195 krb5_free_host_realm (context
, realms
);
200 * Return TRUE iff `principal' is allowed to login as `luser'.
203 krb5_boolean KRB5_LIB_FUNCTION
204 krb5_kuserok (krb5_context context
,
205 krb5_principal principal
,
212 krb5_boolean result
= FALSE
;
214 krb5_boolean found_file
= FALSE
;
216 #ifdef POSIX_GETPWNAM_R
220 if(getpwnam_r(luser
, &pw
, pwbuf
, sizeof(pwbuf
), &pwd
) != 0)
223 pwd
= getpwnam (luser
);
228 #define KLOGIN "/.k5login"
229 buflen
= strlen(pwd
->pw_dir
) + sizeof(KLOGIN
) + 2; /* 2 for .d */
230 buf
= malloc(buflen
);
233 /* check user's ~/.k5login */
234 strlcpy(buf
, pwd
->pw_dir
, buflen
);
235 strlcat(buf
, KLOGIN
, buflen
);
236 ret
= check_one_file(context
, buf
, pwd
, principal
, &result
);
238 if(ret
== 0 && result
== TRUE
) {
246 strlcat(buf
, ".d", buflen
);
247 ret
= check_directory(context
, buf
, pwd
, principal
, &result
);
249 if(ret
== 0 && result
== TRUE
)
252 if(ret
!= ENOENT
&& ret
!= ENOTDIR
)
255 /* finally if no files exist, allow all principals matching
256 <localuser>@<LOCALREALM> */
257 if(found_file
== FALSE
)
258 return match_local_principals(context
, principal
, luser
);