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bcbf86ec | 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 | |
bcbf86ec | 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 | ||
38c295d6 | 12 | #include "includes.h" |
ed787d14 | 13 | RCSID("$OpenBSD: auth-options.c,v 1.20 2001/08/30 20:36:34 stevesk Exp $"); |
38c295d6 | 14 | |
38c295d6 | 15 | #include "packet.h" |
16 | #include "xmalloc.h" | |
17 | #include "match.h" | |
42f11eb2 | 18 | #include "log.h" |
19 | #include "canohost.h" | |
a5efa1bb | 20 | #include "channels.h" |
42f11eb2 | 21 | #include "auth-options.h" |
61e96248 | 22 | #include "servconf.h" |
ed787d14 | 23 | #include "misc.h" |
38c295d6 | 24 | |
25 | /* Flags set authorized_keys flags */ | |
26 | int no_port_forwarding_flag = 0; | |
27 | int no_agent_forwarding_flag = 0; | |
28 | int no_x11_forwarding_flag = 0; | |
29 | int no_pty_flag = 0; | |
30 | ||
31 | /* "command=" option. */ | |
32 | char *forced_command = NULL; | |
33 | ||
34 | /* "environment=" options. */ | |
35 | struct envstring *custom_environment = NULL; | |
36 | ||
61e96248 | 37 | extern ServerOptions options; |
38 | ||
94ec8c6b | 39 | void |
40 | auth_clear_options(void) | |
41 | { | |
42 | no_agent_forwarding_flag = 0; | |
43 | no_port_forwarding_flag = 0; | |
44 | no_pty_flag = 0; | |
45 | no_x11_forwarding_flag = 0; | |
46 | while (custom_environment) { | |
47 | struct envstring *ce = custom_environment; | |
48 | custom_environment = ce->next; | |
49 | xfree(ce->s); | |
50 | xfree(ce); | |
51 | } | |
52 | if (forced_command) { | |
53 | xfree(forced_command); | |
54 | forced_command = NULL; | |
55 | } | |
01794848 | 56 | channel_clear_permitted_opens(); |
94ec8c6b | 57 | } |
58 | ||
42f11eb2 | 59 | /* |
60 | * return 1 if access is granted, 0 if not. | |
61 | * side effect: sets key option flags | |
62 | */ | |
38c295d6 | 63 | int |
61e96248 | 64 | auth_parse_options(struct passwd *pw, char *opts, char *file, u_long linenum) |
38c295d6 | 65 | { |
66 | const char *cp; | |
01794848 | 67 | int i; |
94ec8c6b | 68 | |
69 | /* reset options */ | |
70 | auth_clear_options(); | |
71 | ||
e0b2cf6b | 72 | if (!opts) |
73 | return 1; | |
74 | ||
61e96248 | 75 | while (*opts && *opts != ' ' && *opts != '\t') { |
38c295d6 | 76 | cp = "no-port-forwarding"; |
61e96248 | 77 | if (strncasecmp(opts, cp, strlen(cp)) == 0) { |
38c295d6 | 78 | packet_send_debug("Port forwarding disabled."); |
79 | no_port_forwarding_flag = 1; | |
61e96248 | 80 | opts += strlen(cp); |
38c295d6 | 81 | goto next_option; |
82 | } | |
83 | cp = "no-agent-forwarding"; | |
61e96248 | 84 | if (strncasecmp(opts, cp, strlen(cp)) == 0) { |
38c295d6 | 85 | packet_send_debug("Agent forwarding disabled."); |
86 | no_agent_forwarding_flag = 1; | |
61e96248 | 87 | opts += strlen(cp); |
38c295d6 | 88 | goto next_option; |
89 | } | |
90 | cp = "no-X11-forwarding"; | |
61e96248 | 91 | if (strncasecmp(opts, cp, strlen(cp)) == 0) { |
38c295d6 | 92 | packet_send_debug("X11 forwarding disabled."); |
93 | no_x11_forwarding_flag = 1; | |
61e96248 | 94 | opts += strlen(cp); |
38c295d6 | 95 | goto next_option; |
96 | } | |
97 | cp = "no-pty"; | |
61e96248 | 98 | if (strncasecmp(opts, cp, strlen(cp)) == 0) { |
38c295d6 | 99 | packet_send_debug("Pty allocation disabled."); |
100 | no_pty_flag = 1; | |
61e96248 | 101 | opts += strlen(cp); |
38c295d6 | 102 | goto next_option; |
103 | } | |
104 | cp = "command=\""; | |
61e96248 | 105 | if (strncasecmp(opts, cp, strlen(cp)) == 0) { |
61e96248 | 106 | opts += strlen(cp); |
107 | forced_command = xmalloc(strlen(opts) + 1); | |
38c295d6 | 108 | i = 0; |
61e96248 | 109 | while (*opts) { |
110 | if (*opts == '"') | |
38c295d6 | 111 | break; |
61e96248 | 112 | if (*opts == '\\' && opts[1] == '"') { |
113 | opts += 2; | |
38c295d6 | 114 | forced_command[i++] = '"'; |
115 | continue; | |
116 | } | |
61e96248 | 117 | forced_command[i++] = *opts++; |
38c295d6 | 118 | } |
61e96248 | 119 | if (!*opts) { |
38c295d6 | 120 | debug("%.100s, line %lu: missing end quote", |
42f11eb2 | 121 | file, linenum); |
38c295d6 | 122 | packet_send_debug("%.100s, line %lu: missing end quote", |
42f11eb2 | 123 | file, linenum); |
acc9d6d7 | 124 | xfree(forced_command); |
125 | forced_command = NULL; | |
126 | goto bad_option; | |
38c295d6 | 127 | } |
128 | forced_command[i] = 0; | |
129 | packet_send_debug("Forced command: %.900s", forced_command); | |
61e96248 | 130 | opts++; |
38c295d6 | 131 | goto next_option; |
132 | } | |
133 | cp = "environment=\""; | |
61e96248 | 134 | if (strncasecmp(opts, cp, strlen(cp)) == 0) { |
38c295d6 | 135 | char *s; |
136 | struct envstring *new_envstring; | |
01794848 | 137 | |
61e96248 | 138 | opts += strlen(cp); |
139 | s = xmalloc(strlen(opts) + 1); | |
38c295d6 | 140 | i = 0; |
61e96248 | 141 | while (*opts) { |
142 | if (*opts == '"') | |
38c295d6 | 143 | break; |
61e96248 | 144 | if (*opts == '\\' && opts[1] == '"') { |
145 | opts += 2; | |
38c295d6 | 146 | s[i++] = '"'; |
147 | continue; | |
148 | } | |
61e96248 | 149 | s[i++] = *opts++; |
38c295d6 | 150 | } |
61e96248 | 151 | if (!*opts) { |
38c295d6 | 152 | debug("%.100s, line %lu: missing end quote", |
42f11eb2 | 153 | file, linenum); |
38c295d6 | 154 | packet_send_debug("%.100s, line %lu: missing end quote", |
42f11eb2 | 155 | file, linenum); |
acc9d6d7 | 156 | xfree(s); |
157 | goto bad_option; | |
38c295d6 | 158 | } |
159 | s[i] = 0; | |
160 | packet_send_debug("Adding to environment: %.900s", s); | |
161 | debug("Adding to environment: %.900s", s); | |
61e96248 | 162 | opts++; |
38c295d6 | 163 | new_envstring = xmalloc(sizeof(struct envstring)); |
164 | new_envstring->s = s; | |
165 | new_envstring->next = custom_environment; | |
166 | custom_environment = new_envstring; | |
167 | goto next_option; | |
168 | } | |
169 | cp = "from=\""; | |
61e96248 | 170 | if (strncasecmp(opts, cp, strlen(cp)) == 0) { |
61e96248 | 171 | const char *remote_ip = get_remote_ipaddr(); |
172 | const char *remote_host = get_canonical_hostname( | |
173 | options.reverse_mapping_check); | |
174 | char *patterns = xmalloc(strlen(opts) + 1); | |
01794848 | 175 | |
61e96248 | 176 | opts += strlen(cp); |
38c295d6 | 177 | i = 0; |
61e96248 | 178 | while (*opts) { |
179 | if (*opts == '"') | |
38c295d6 | 180 | break; |
61e96248 | 181 | if (*opts == '\\' && opts[1] == '"') { |
182 | opts += 2; | |
38c295d6 | 183 | patterns[i++] = '"'; |
184 | continue; | |
185 | } | |
61e96248 | 186 | patterns[i++] = *opts++; |
38c295d6 | 187 | } |
61e96248 | 188 | if (!*opts) { |
38c295d6 | 189 | debug("%.100s, line %lu: missing end quote", |
42f11eb2 | 190 | file, linenum); |
38c295d6 | 191 | packet_send_debug("%.100s, line %lu: missing end quote", |
42f11eb2 | 192 | file, linenum); |
acc9d6d7 | 193 | xfree(patterns); |
194 | goto bad_option; | |
38c295d6 | 195 | } |
196 | patterns[i] = 0; | |
61e96248 | 197 | opts++; |
2cee8a25 | 198 | if (match_host_and_ip(remote_host, remote_ip, |
199 | patterns) != 1) { | |
200 | xfree(patterns); | |
61e96248 | 201 | log("Authentication tried for %.100s with " |
202 | "correct key but not from a permitted " | |
203 | "host (host=%.200s, ip=%.200s).", | |
204 | pw->pw_name, remote_host, remote_ip); | |
205 | packet_send_debug("Your host '%.200s' is not " | |
206 | "permitted to use this key for login.", | |
207 | remote_host); | |
38c295d6 | 208 | /* deny access */ |
209 | return 0; | |
210 | } | |
2cee8a25 | 211 | xfree(patterns); |
38c295d6 | 212 | /* Host name matches. */ |
213 | goto next_option; | |
214 | } | |
01794848 | 215 | cp = "permitopen=\""; |
216 | if (strncasecmp(opts, cp, strlen(cp)) == 0) { | |
ed787d14 | 217 | char host[256], sport[6]; |
01794848 | 218 | u_short port; |
01794848 | 219 | char *patterns = xmalloc(strlen(opts) + 1); |
220 | ||
221 | opts += strlen(cp); | |
222 | i = 0; | |
223 | while (*opts) { | |
224 | if (*opts == '"') | |
225 | break; | |
226 | if (*opts == '\\' && opts[1] == '"') { | |
227 | opts += 2; | |
228 | patterns[i++] = '"'; | |
229 | continue; | |
230 | } | |
231 | patterns[i++] = *opts++; | |
232 | } | |
233 | if (!*opts) { | |
234 | debug("%.100s, line %lu: missing end quote", | |
235 | file, linenum); | |
236 | packet_send_debug("%.100s, line %lu: missing end quote", | |
237 | file, linenum); | |
238 | xfree(patterns); | |
239 | goto bad_option; | |
240 | } | |
241 | patterns[i] = 0; | |
242 | opts++; | |
ed787d14 | 243 | if (sscanf(patterns, "%255[^:]:%5[0-9]", host, sport) != 2 && |
244 | sscanf(patterns, "%255[^/]/%5[0-9]", host, sport) != 2) { | |
245 | debug("%.100s, line %lu: Bad permitopen specification " | |
246 | "<%.100s>", file, linenum, patterns); | |
247 | packet_send_debug("%.100s, line %lu: " | |
248 | "Bad permitopen specification", file, linenum); | |
01794848 | 249 | xfree(patterns); |
250 | goto bad_option; | |
251 | } | |
ed787d14 | 252 | if ((port = a2port(sport)) == 0) { |
253 | debug("%.100s, line %lu: Bad permitopen port <%.100s>", | |
254 | file, linenum, sport); | |
255 | packet_send_debug("%.100s, line %lu: " | |
256 | "Bad permitopen port", file, linenum); | |
01794848 | 257 | xfree(patterns); |
258 | goto bad_option; | |
259 | } | |
b1ed8313 | 260 | if (options.allow_tcp_forwarding) |
ed787d14 | 261 | channel_add_permitted_opens(host, port); |
01794848 | 262 | xfree(patterns); |
263 | goto next_option; | |
264 | } | |
38c295d6 | 265 | next_option: |
266 | /* | |
267 | * Skip the comma, and move to the next option | |
268 | * (or break out if there are no more). | |
269 | */ | |
61e96248 | 270 | if (!*opts) |
38c295d6 | 271 | fatal("Bugs in auth-options.c option processing."); |
61e96248 | 272 | if (*opts == ' ' || *opts == '\t') |
38c295d6 | 273 | break; /* End of options. */ |
61e96248 | 274 | if (*opts != ',') |
38c295d6 | 275 | goto bad_option; |
61e96248 | 276 | opts++; |
38c295d6 | 277 | /* Process the next option. */ |
278 | } | |
279 | /* grant access */ | |
280 | return 1; | |
281 | ||
282 | bad_option: | |
283 | log("Bad options in %.100s file, line %lu: %.50s", | |
61e96248 | 284 | file, linenum, opts); |
38c295d6 | 285 | packet_send_debug("Bad options in %.100s file, line %lu: %.50s", |
61e96248 | 286 | file, linenum, opts); |
38c295d6 | 287 | /* deny access */ |
288 | return 0; | |
289 | } |