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7368a6c8 | 1 | /* |
e78a59f5 | 2 | * Copyright (c) 2000 Markus Friedl. All rights reserved. |
bcbf86ec | 3 | * |
4 | * Redistribution and use in source and binary forms, with or without | |
5 | * modification, are permitted provided that the following conditions | |
6 | * are met: | |
7 | * 1. Redistributions of source code must retain the above copyright | |
8 | * notice, this list of conditions and the following disclaimer. | |
9 | * 2. Redistributions in binary form must reproduce the above copyright | |
10 | * notice, this list of conditions and the following disclaimer in the | |
11 | * documentation and/or other materials provided with the distribution. | |
12 | * | |
13 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
14 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
15 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
16 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
17 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
18 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
19 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
20 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
21 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
22 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
7368a6c8 | 23 | */ |
24 | ||
25 | #include "includes.h" | |
42f11eb2 | 26 | RCSID("$OpenBSD: auth.c,v 1.14 2001/01/21 19:05:43 markus Exp $"); |
7368a6c8 | 27 | |
c1ef8333 | 28 | #ifdef HAVE_LOGIN_H |
29 | #include <login.h> | |
30 | #endif | |
4cb5ffa0 | 31 | #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) |
32 | #include <shadow.h> | |
33 | #endif /* defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) */ | |
7368a6c8 | 34 | |
42f11eb2 | 35 | #include "xmalloc.h" |
36 | #include "match.h" | |
37 | #include "groupaccess.h" | |
38 | #include "log.h" | |
39 | #include "servconf.h" | |
e78a59f5 | 40 | #include "auth.h" |
59c97189 | 41 | #include "auth-options.h" |
42f11eb2 | 42 | #include "canohost.h" |
e78a59f5 | 43 | |
7368a6c8 | 44 | /* import */ |
45 | extern ServerOptions options; | |
7368a6c8 | 46 | |
47 | /* | |
c6a69271 | 48 | * Check if the user is allowed to log in via ssh. If user is listed |
49 | * in DenyUsers or one of user's groups is listed in DenyGroups, false | |
50 | * will be returned. If AllowUsers isn't empty and user isn't listed | |
51 | * there, or if AllowGroups isn't empty and one of user's groups isn't | |
52 | * listed there, false will be returned. | |
7368a6c8 | 53 | * If the user's shell is not executable, false will be returned. |
6ae2364d | 54 | * Otherwise true is returned. |
7368a6c8 | 55 | */ |
a306f2dd | 56 | int |
7368a6c8 | 57 | allowed_user(struct passwd * pw) |
58 | { | |
59 | struct stat st; | |
301e9b01 | 60 | char *shell; |
7368a6c8 | 61 | int i; |
62 | #ifdef WITH_AIXAUTHENTICATE | |
63 | char *loginmsg; | |
64 | #endif /* WITH_AIXAUTHENTICATE */ | |
75b90ced | 65 | #if !defined(USE_PAM) && defined(HAVE_SHADOW_H) && \ |
37c1c46d | 66 | !defined(DISABLE_SHADOW) && defined(HAS_SHADOW_EXPIRE) |
c6a69271 | 67 | struct spwd *spw; |
7368a6c8 | 68 | |
69 | /* Shouldn't be called if pw is NULL, but better safe than sorry... */ | |
c6a69271 | 70 | if (!pw || !pw->pw_name) |
7368a6c8 | 71 | return 0; |
72 | ||
4cb5ffa0 | 73 | spw = getspnam(pw->pw_name); |
27494968 | 74 | if (spw != NULL) { |
75 | int days = time(NULL) / 86400; | |
4cb5ffa0 | 76 | |
27494968 | 77 | /* Check account expiry */ |
37c1c46d | 78 | if ((spw->sp_expire >= 0) && (days > spw->sp_expire)) |
27494968 | 79 | return 0; |
80 | ||
81 | /* Check password expiry */ | |
37c1c46d | 82 | if ((spw->sp_lstchg >= 0) && (spw->sp_max >= 0) && |
7f8f5e00 | 83 | (days > (spw->sp_lstchg + spw->sp_max))) |
27494968 | 84 | return 0; |
85 | } | |
4cb5ffa0 | 86 | #else |
87 | /* Shouldn't be called if pw is NULL, but better safe than sorry... */ | |
c6a69271 | 88 | if (!pw || !pw->pw_name) |
4cb5ffa0 | 89 | return 0; |
90 | #endif | |
91 | ||
301e9b01 | 92 | /* |
93 | * Get the shell from the password data. An empty shell field is | |
94 | * legal, and means /bin/sh. | |
95 | */ | |
96 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
97 | ||
98 | /* deny if shell does not exists or is not executable */ | |
99 | if (stat(shell, &st) != 0) | |
7368a6c8 | 100 | return 0; |
101 | if (!((st.st_mode & S_IFREG) && (st.st_mode & (S_IXOTH|S_IXUSR|S_IXGRP)))) | |
102 | return 0; | |
103 | ||
104 | /* Return false if user is listed in DenyUsers */ | |
105 | if (options.num_deny_users > 0) { | |
7368a6c8 | 106 | for (i = 0; i < options.num_deny_users; i++) |
107 | if (match_pattern(pw->pw_name, options.deny_users[i])) | |
108 | return 0; | |
109 | } | |
110 | /* Return false if AllowUsers isn't empty and user isn't listed there */ | |
111 | if (options.num_allow_users > 0) { | |
7368a6c8 | 112 | for (i = 0; i < options.num_allow_users; i++) |
113 | if (match_pattern(pw->pw_name, options.allow_users[i])) | |
114 | break; | |
115 | /* i < options.num_allow_users iff we break for loop */ | |
116 | if (i >= options.num_allow_users) | |
117 | return 0; | |
118 | } | |
7368a6c8 | 119 | if (options.num_deny_groups > 0 || options.num_allow_groups > 0) { |
c6a69271 | 120 | /* Get the user's group access list (primary and supplementary) */ |
121 | if (ga_init(pw->pw_name, pw->pw_gid) == 0) | |
7368a6c8 | 122 | return 0; |
123 | ||
c6a69271 | 124 | /* Return false if one of user's groups is listed in DenyGroups */ |
125 | if (options.num_deny_groups > 0) | |
126 | if (ga_match(options.deny_groups, | |
127 | options.num_deny_groups)) { | |
128 | ga_free(); | |
7368a6c8 | 129 | return 0; |
c6a69271 | 130 | } |
7368a6c8 | 131 | /* |
c6a69271 | 132 | * Return false if AllowGroups isn't empty and one of user's groups |
7368a6c8 | 133 | * isn't listed there |
134 | */ | |
c6a69271 | 135 | if (options.num_allow_groups > 0) |
136 | if (!ga_match(options.allow_groups, | |
137 | options.num_allow_groups)) { | |
138 | ga_free(); | |
7368a6c8 | 139 | return 0; |
c6a69271 | 140 | } |
141 | ga_free(); | |
7368a6c8 | 142 | } |
143 | ||
144 | #ifdef WITH_AIXAUTHENTICATE | |
5daf7064 | 145 | if (loginrestrictions(pw->pw_name, S_RLOGIN, NULL, &loginmsg) != 0) { |
c1ef8333 | 146 | if (loginmsg && *loginmsg) { |
147 | /* Remove embedded newlines (if any) */ | |
148 | char *p; | |
5daf7064 | 149 | for (p = loginmsg; *p; p++) { |
c1ef8333 | 150 | if (*p == '\n') |
151 | *p = ' '; | |
5daf7064 | 152 | } |
c1ef8333 | 153 | /* Remove trailing newline */ |
154 | *--p = '\0'; | |
5daf7064 | 155 | log("Login restricted for %s: %.100s", pw->pw_name, loginmsg); |
c1ef8333 | 156 | } |
7368a6c8 | 157 | return 0; |
c1ef8333 | 158 | } |
7368a6c8 | 159 | #endif /* WITH_AIXAUTHENTICATE */ |
160 | ||
161 | /* We found no reason not to let this user try to log on... */ | |
162 | return 1; | |
163 | } | |
59c97189 | 164 | |
165 | Authctxt * | |
166 | authctxt_new(void) | |
167 | { | |
168 | Authctxt *authctxt = xmalloc(sizeof(*authctxt)); | |
169 | memset(authctxt, 0, sizeof(*authctxt)); | |
170 | return authctxt; | |
171 | } | |
172 | ||
173 | struct passwd * | |
174 | pwcopy(struct passwd *pw) | |
175 | { | |
176 | struct passwd *copy = xmalloc(sizeof(*copy)); | |
177 | memset(copy, 0, sizeof(*copy)); | |
178 | copy->pw_name = xstrdup(pw->pw_name); | |
179 | copy->pw_passwd = xstrdup(pw->pw_passwd); | |
180 | copy->pw_uid = pw->pw_uid; | |
181 | copy->pw_gid = pw->pw_gid; | |
182 | #ifdef HAVE_PW_CLASS_IN_PASSWD | |
183 | copy->pw_class = xstrdup(pw->pw_class); | |
184 | #endif | |
185 | copy->pw_dir = xstrdup(pw->pw_dir); | |
186 | copy->pw_shell = xstrdup(pw->pw_shell); | |
187 | return copy; | |
188 | } | |
189 | ||
190 | void | |
191 | auth_log(Authctxt *authctxt, int authenticated, char *method, char *info) | |
192 | { | |
193 | void (*authlog) (const char *fmt,...) = verbose; | |
194 | char *authmsg; | |
195 | ||
196 | /* Raise logging level */ | |
197 | if (authenticated == 1 || | |
198 | !authctxt->valid || | |
199 | authctxt->failures >= AUTH_FAIL_LOG || | |
200 | strcmp(method, "password") == 0) | |
201 | authlog = log; | |
202 | ||
203 | if (authctxt->postponed) | |
204 | authmsg = "Postponed"; | |
205 | else | |
206 | authmsg = authenticated ? "Accepted" : "Failed"; | |
207 | ||
208 | authlog("%s %s for %s%.100s from %.200s port %d%s", | |
209 | authmsg, | |
210 | method, | |
211 | authctxt->valid ? "" : "illegal user ", | |
212 | authctxt->valid && authctxt->pw->pw_uid == 0 ? "ROOT" : authctxt->user, | |
213 | get_remote_ipaddr(), | |
214 | get_remote_port(), | |
215 | info); | |
216 | } | |
217 | ||
218 | /* | |
219 | * Check if the user is logging in as root and root logins are disallowed. | |
220 | * Note that root login is _allways_ allowed for forced commands. | |
221 | */ | |
222 | int | |
223 | auth_root_allowed(void) | |
224 | { | |
225 | if (options.permit_root_login) | |
226 | return 1; | |
227 | if (forced_command) { | |
228 | log("Root login accepted for forced command."); | |
229 | return 1; | |
230 | } else { | |
231 | log("ROOT LOGIN REFUSED FROM %.200s", get_canonical_hostname()); | |
232 | return 0; | |
233 | } | |
234 | } |