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3c0ef626 | 1 | /* |
2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> | |
3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
4 | * All rights reserved | |
5 | * As far as I am concerned, the code I have written for this software | |
6 | * can be used freely for any purpose. Any derived versions of this | |
7 | * software must be clearly marked as such, and if the derived work is | |
8 | * incompatible with the protocol description in the RFC file, it must be | |
9 | * called by a name other than "ssh" or "Secure Shell". | |
10 | */ | |
11 | ||
12 | #include "includes.h" | |
510132b6 | 13 | RCSID("$OpenBSD: auth-options.c,v 1.24 2002/05/13 20:44:58 markus Exp $"); |
3c0ef626 | 14 | |
15 | #include "packet.h" | |
16 | #include "xmalloc.h" | |
17 | #include "match.h" | |
18 | #include "log.h" | |
19 | #include "canohost.h" | |
20 | #include "channels.h" | |
21 | #include "auth-options.h" | |
22 | #include "servconf.h" | |
510132b6 | 23 | #include "bufaux.h" |
3c0ef626 | 24 | #include "misc.h" |
510132b6 | 25 | #include "monitor_wrap.h" |
26 | #include "auth.h" | |
3c0ef626 | 27 | |
28 | /* Flags set authorized_keys flags */ | |
29 | int no_port_forwarding_flag = 0; | |
30 | int no_agent_forwarding_flag = 0; | |
31 | int no_x11_forwarding_flag = 0; | |
32 | int no_pty_flag = 0; | |
33 | ||
34 | /* "command=" option. */ | |
35 | char *forced_command = NULL; | |
36 | ||
37 | /* "environment=" options. */ | |
38 | struct envstring *custom_environment = NULL; | |
39 | ||
40 | extern ServerOptions options; | |
41 | ||
42 | void | |
43 | auth_clear_options(void) | |
44 | { | |
45 | no_agent_forwarding_flag = 0; | |
46 | no_port_forwarding_flag = 0; | |
47 | no_pty_flag = 0; | |
48 | no_x11_forwarding_flag = 0; | |
49 | while (custom_environment) { | |
50 | struct envstring *ce = custom_environment; | |
51 | custom_environment = ce->next; | |
52 | xfree(ce->s); | |
53 | xfree(ce); | |
54 | } | |
55 | if (forced_command) { | |
56 | xfree(forced_command); | |
57 | forced_command = NULL; | |
58 | } | |
59 | channel_clear_permitted_opens(); | |
510132b6 | 60 | auth_debug_reset(); |
3c0ef626 | 61 | } |
62 | ||
63 | /* | |
64 | * return 1 if access is granted, 0 if not. | |
65 | * side effect: sets key option flags | |
66 | */ | |
67 | int | |
68 | auth_parse_options(struct passwd *pw, char *opts, char *file, u_long linenum) | |
69 | { | |
70 | const char *cp; | |
71 | int i; | |
72 | ||
73 | /* reset options */ | |
74 | auth_clear_options(); | |
75 | ||
76 | if (!opts) | |
77 | return 1; | |
78 | ||
79 | while (*opts && *opts != ' ' && *opts != '\t') { | |
80 | cp = "no-port-forwarding"; | |
81 | if (strncasecmp(opts, cp, strlen(cp)) == 0) { | |
510132b6 | 82 | auth_debug_add("Port forwarding disabled."); |
3c0ef626 | 83 | no_port_forwarding_flag = 1; |
84 | opts += strlen(cp); | |
85 | goto next_option; | |
86 | } | |
87 | cp = "no-agent-forwarding"; | |
88 | if (strncasecmp(opts, cp, strlen(cp)) == 0) { | |
510132b6 | 89 | auth_debug_add("Agent forwarding disabled."); |
3c0ef626 | 90 | no_agent_forwarding_flag = 1; |
91 | opts += strlen(cp); | |
92 | goto next_option; | |
93 | } | |
94 | cp = "no-X11-forwarding"; | |
95 | if (strncasecmp(opts, cp, strlen(cp)) == 0) { | |
510132b6 | 96 | auth_debug_add("X11 forwarding disabled."); |
3c0ef626 | 97 | no_x11_forwarding_flag = 1; |
98 | opts += strlen(cp); | |
99 | goto next_option; | |
100 | } | |
101 | cp = "no-pty"; | |
102 | if (strncasecmp(opts, cp, strlen(cp)) == 0) { | |
510132b6 | 103 | auth_debug_add("Pty allocation disabled."); |
3c0ef626 | 104 | no_pty_flag = 1; |
105 | opts += strlen(cp); | |
106 | goto next_option; | |
107 | } | |
108 | cp = "command=\""; | |
109 | if (strncasecmp(opts, cp, strlen(cp)) == 0) { | |
110 | opts += strlen(cp); | |
111 | forced_command = xmalloc(strlen(opts) + 1); | |
112 | i = 0; | |
113 | while (*opts) { | |
114 | if (*opts == '"') | |
115 | break; | |
116 | if (*opts == '\\' && opts[1] == '"') { | |
117 | opts += 2; | |
118 | forced_command[i++] = '"'; | |
119 | continue; | |
120 | } | |
121 | forced_command[i++] = *opts++; | |
122 | } | |
123 | if (!*opts) { | |
124 | debug("%.100s, line %lu: missing end quote", | |
125 | file, linenum); | |
510132b6 | 126 | auth_debug_add("%.100s, line %lu: missing end quote", |
3c0ef626 | 127 | file, linenum); |
128 | xfree(forced_command); | |
129 | forced_command = NULL; | |
130 | goto bad_option; | |
131 | } | |
132 | forced_command[i] = 0; | |
510132b6 | 133 | auth_debug_add("Forced command: %.900s", forced_command); |
3c0ef626 | 134 | opts++; |
135 | goto next_option; | |
136 | } | |
137 | cp = "environment=\""; | |
138 | if (strncasecmp(opts, cp, strlen(cp)) == 0) { | |
139 | char *s; | |
140 | struct envstring *new_envstring; | |
141 | ||
142 | opts += strlen(cp); | |
143 | s = xmalloc(strlen(opts) + 1); | |
144 | i = 0; | |
145 | while (*opts) { | |
146 | if (*opts == '"') | |
147 | break; | |
148 | if (*opts == '\\' && opts[1] == '"') { | |
149 | opts += 2; | |
150 | s[i++] = '"'; | |
151 | continue; | |
152 | } | |
153 | s[i++] = *opts++; | |
154 | } | |
155 | if (!*opts) { | |
156 | debug("%.100s, line %lu: missing end quote", | |
157 | file, linenum); | |
510132b6 | 158 | auth_debug_add("%.100s, line %lu: missing end quote", |
3c0ef626 | 159 | file, linenum); |
160 | xfree(s); | |
161 | goto bad_option; | |
162 | } | |
163 | s[i] = 0; | |
510132b6 | 164 | auth_debug_add("Adding to environment: %.900s", s); |
3c0ef626 | 165 | debug("Adding to environment: %.900s", s); |
166 | opts++; | |
167 | new_envstring = xmalloc(sizeof(struct envstring)); | |
168 | new_envstring->s = s; | |
169 | new_envstring->next = custom_environment; | |
170 | custom_environment = new_envstring; | |
171 | goto next_option; | |
172 | } | |
173 | cp = "from=\""; | |
174 | if (strncasecmp(opts, cp, strlen(cp)) == 0) { | |
175 | const char *remote_ip = get_remote_ipaddr(); | |
176 | const char *remote_host = get_canonical_hostname( | |
1e608e42 | 177 | options.verify_reverse_mapping); |
3c0ef626 | 178 | char *patterns = xmalloc(strlen(opts) + 1); |
179 | ||
180 | opts += strlen(cp); | |
181 | i = 0; | |
182 | while (*opts) { | |
183 | if (*opts == '"') | |
184 | break; | |
185 | if (*opts == '\\' && opts[1] == '"') { | |
186 | opts += 2; | |
187 | patterns[i++] = '"'; | |
188 | continue; | |
189 | } | |
190 | patterns[i++] = *opts++; | |
191 | } | |
192 | if (!*opts) { | |
193 | debug("%.100s, line %lu: missing end quote", | |
194 | file, linenum); | |
510132b6 | 195 | auth_debug_add("%.100s, line %lu: missing end quote", |
3c0ef626 | 196 | file, linenum); |
197 | xfree(patterns); | |
198 | goto bad_option; | |
199 | } | |
200 | patterns[i] = 0; | |
201 | opts++; | |
202 | if (match_host_and_ip(remote_host, remote_ip, | |
203 | patterns) != 1) { | |
204 | xfree(patterns); | |
205 | log("Authentication tried for %.100s with " | |
206 | "correct key but not from a permitted " | |
207 | "host (host=%.200s, ip=%.200s).", | |
208 | pw->pw_name, remote_host, remote_ip); | |
510132b6 | 209 | auth_debug_add("Your host '%.200s' is not " |
3c0ef626 | 210 | "permitted to use this key for login.", |
211 | remote_host); | |
212 | /* deny access */ | |
213 | return 0; | |
214 | } | |
215 | xfree(patterns); | |
216 | /* Host name matches. */ | |
217 | goto next_option; | |
218 | } | |
219 | cp = "permitopen=\""; | |
220 | if (strncasecmp(opts, cp, strlen(cp)) == 0) { | |
221 | char host[256], sport[6]; | |
222 | u_short port; | |
223 | char *patterns = xmalloc(strlen(opts) + 1); | |
224 | ||
225 | opts += strlen(cp); | |
226 | i = 0; | |
227 | while (*opts) { | |
228 | if (*opts == '"') | |
229 | break; | |
230 | if (*opts == '\\' && opts[1] == '"') { | |
231 | opts += 2; | |
232 | patterns[i++] = '"'; | |
233 | continue; | |
234 | } | |
235 | patterns[i++] = *opts++; | |
236 | } | |
237 | if (!*opts) { | |
238 | debug("%.100s, line %lu: missing end quote", | |
239 | file, linenum); | |
510132b6 | 240 | auth_debug_add("%.100s, line %lu: missing end quote", |
3c0ef626 | 241 | file, linenum); |
242 | xfree(patterns); | |
243 | goto bad_option; | |
244 | } | |
245 | patterns[i] = 0; | |
246 | opts++; | |
247 | if (sscanf(patterns, "%255[^:]:%5[0-9]", host, sport) != 2 && | |
248 | sscanf(patterns, "%255[^/]/%5[0-9]", host, sport) != 2) { | |
249 | debug("%.100s, line %lu: Bad permitopen specification " | |
250 | "<%.100s>", file, linenum, patterns); | |
510132b6 | 251 | auth_debug_add("%.100s, line %lu: " |
3c0ef626 | 252 | "Bad permitopen specification", file, linenum); |
253 | xfree(patterns); | |
254 | goto bad_option; | |
255 | } | |
256 | if ((port = a2port(sport)) == 0) { | |
257 | debug("%.100s, line %lu: Bad permitopen port <%.100s>", | |
258 | file, linenum, sport); | |
510132b6 | 259 | auth_debug_add("%.100s, line %lu: " |
3c0ef626 | 260 | "Bad permitopen port", file, linenum); |
261 | xfree(patterns); | |
262 | goto bad_option; | |
263 | } | |
264 | if (options.allow_tcp_forwarding) | |
265 | channel_add_permitted_opens(host, port); | |
266 | xfree(patterns); | |
267 | goto next_option; | |
268 | } | |
269 | next_option: | |
270 | /* | |
271 | * Skip the comma, and move to the next option | |
272 | * (or break out if there are no more). | |
273 | */ | |
274 | if (!*opts) | |
275 | fatal("Bugs in auth-options.c option processing."); | |
276 | if (*opts == ' ' || *opts == '\t') | |
277 | break; /* End of options. */ | |
278 | if (*opts != ',') | |
279 | goto bad_option; | |
280 | opts++; | |
281 | /* Process the next option. */ | |
282 | } | |
510132b6 | 283 | |
284 | if (!use_privsep) | |
285 | auth_debug_send(); | |
286 | ||
3c0ef626 | 287 | /* grant access */ |
288 | return 1; | |
289 | ||
290 | bad_option: | |
291 | log("Bad options in %.100s file, line %lu: %.50s", | |
292 | file, linenum, opts); | |
510132b6 | 293 | auth_debug_add("Bad options in %.100s file, line %lu: %.50s", |
3c0ef626 | 294 | file, linenum, opts); |
510132b6 | 295 | |
296 | if (!use_privsep) | |
297 | auth_debug_send(); | |
298 | ||
3c0ef626 | 299 | /* deny access */ |
300 | return 0; | |
301 | } |