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1 | /* |
2 | * uxcons.c: various interactive-prompt routines shared between the |
3 | * Unix console PuTTY tools |
4 | */ |
5 | |
6 | #include <stdio.h> |
7 | #include <stdlib.h> |
8 | #include <stdarg.h> |
9 | #include <assert.h> |
10 | #include <termios.h> |
11 | #include <unistd.h> |
12 | |
13 | #include "putty.h" |
14 | #include "storage.h" |
15 | #include "ssh.h" |
16 | |
17 | int console_batch_mode = FALSE; |
18 | |
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19 | static void *console_logctx = NULL; |
20 | |
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21 | /* |
22 | * Clean up and exit. |
23 | */ |
24 | void cleanup_exit(int code) |
25 | { |
26 | /* |
27 | * Clean up. |
28 | */ |
29 | sk_cleanup(); |
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30 | random_save_seed(); |
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31 | exit(code); |
32 | } |
33 | |
125105d1 |
34 | void update_specials_menu(void *frontend) |
35 | { |
36 | } |
37 | |
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38 | void verify_ssh_host_key(void *frontend, char *host, int port, char *keytype, |
39 | char *keystr, char *fingerprint) |
40 | { |
41 | int ret; |
42 | |
43 | static const char absentmsg_batch[] = |
44 | "The server's host key is not cached. You have no guarantee\n" |
45 | "that the server is the computer you think it is.\n" |
65f66c88 |
46 | "The server's %s key fingerprint is:\n" |
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47 | "%s\n" |
48 | "Connection abandoned.\n"; |
49 | static const char absentmsg[] = |
50 | "The server's host key is not cached. You have no guarantee\n" |
51 | "that the server is the computer you think it is.\n" |
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52 | "The server's %s key fingerprint is:\n" |
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53 | "%s\n" |
54 | "If you trust this host, enter \"y\" to add the key to\n" |
55 | "PuTTY's cache and carry on connecting.\n" |
56 | "If you want to carry on connecting just once, without\n" |
57 | "adding the key to the cache, enter \"n\".\n" |
58 | "If you do not trust this host, press Return to abandon the\n" |
59 | "connection.\n" |
60 | "Store key in cache? (y/n) "; |
61 | |
62 | static const char wrongmsg_batch[] = |
63 | "WARNING - POTENTIAL SECURITY BREACH!\n" |
64 | "The server's host key does not match the one PuTTY has\n" |
65 | "cached. This means that either the server administrator\n" |
66 | "has changed the host key, or you have actually connected\n" |
67 | "to another computer pretending to be the server.\n" |
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68 | "The new %s key fingerprint is:\n" |
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69 | "%s\n" |
70 | "Connection abandoned.\n"; |
71 | static const char wrongmsg[] = |
72 | "WARNING - POTENTIAL SECURITY BREACH!\n" |
73 | "The server's host key does not match the one PuTTY has\n" |
74 | "cached. This means that either the server administrator\n" |
75 | "has changed the host key, or you have actually connected\n" |
76 | "to another computer pretending to be the server.\n" |
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77 | "The new %s key fingerprint is:\n" |
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78 | "%s\n" |
79 | "If you were expecting this change and trust the new key,\n" |
80 | "enter \"y\" to update PuTTY's cache and continue connecting.\n" |
81 | "If you want to carry on connecting but without updating\n" |
82 | "the cache, enter \"n\".\n" |
83 | "If you want to abandon the connection completely, press\n" |
84 | "Return to cancel. Pressing Return is the ONLY guaranteed\n" |
85 | "safe choice.\n" |
86 | "Update cached key? (y/n, Return cancels connection) "; |
87 | |
88 | static const char abandoned[] = "Connection abandoned.\n"; |
89 | |
90 | char line[32]; |
91 | |
92 | /* |
93 | * Verify the key. |
94 | */ |
95 | ret = verify_host_key(host, port, keytype, keystr); |
96 | |
97 | if (ret == 0) /* success - key matched OK */ |
98 | return; |
99 | |
100 | if (ret == 2) { /* key was different */ |
101 | if (console_batch_mode) { |
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102 | fprintf(stderr, wrongmsg_batch, keytype, fingerprint); |
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103 | cleanup_exit(1); |
104 | } |
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105 | fprintf(stderr, wrongmsg, keytype, fingerprint); |
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106 | fflush(stderr); |
107 | } |
108 | if (ret == 1) { /* key was absent */ |
109 | if (console_batch_mode) { |
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110 | fprintf(stderr, absentmsg_batch, keytype, fingerprint); |
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111 | cleanup_exit(1); |
112 | } |
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113 | fprintf(stderr, absentmsg, keytype, fingerprint); |
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114 | fflush(stderr); |
115 | } |
116 | |
117 | { |
118 | struct termios oldmode, newmode; |
119 | tcgetattr(0, &oldmode); |
120 | newmode = oldmode; |
121 | newmode.c_lflag |= ECHO | ISIG | ICANON; |
122 | tcsetattr(0, TCSANOW, &newmode); |
123 | line[0] = '\0'; |
124 | read(0, line, sizeof(line) - 1); |
125 | tcsetattr(0, TCSANOW, &oldmode); |
126 | } |
127 | |
128 | if (line[0] != '\0' && line[0] != '\r' && line[0] != '\n') { |
129 | if (line[0] == 'y' || line[0] == 'Y') |
130 | store_host_key(host, port, keytype, keystr); |
131 | } else { |
132 | fprintf(stderr, abandoned); |
133 | cleanup_exit(0); |
134 | } |
135 | } |
136 | |
137 | /* |
138 | * Ask whether the selected cipher is acceptable (since it was |
139 | * below the configured 'warn' threshold). |
140 | * cs: 0 = both ways, 1 = client->server, 2 = server->client |
141 | */ |
142 | void askcipher(void *frontend, char *ciphername, int cs) |
143 | { |
144 | static const char msg[] = |
145 | "The first %scipher supported by the server is\n" |
146 | "%s, which is below the configured warning threshold.\n" |
147 | "Continue with connection? (y/n) "; |
148 | static const char msg_batch[] = |
149 | "The first %scipher supported by the server is\n" |
150 | "%s, which is below the configured warning threshold.\n" |
151 | "Connection abandoned.\n"; |
152 | static const char abandoned[] = "Connection abandoned.\n"; |
153 | |
154 | char line[32]; |
155 | |
156 | if (console_batch_mode) { |
157 | fprintf(stderr, msg_batch, |
158 | (cs == 0) ? "" : |
159 | (cs == 1) ? "client-to-server " : "server-to-client ", |
160 | ciphername); |
161 | cleanup_exit(1); |
162 | } |
163 | |
164 | fprintf(stderr, msg, |
165 | (cs == 0) ? "" : |
166 | (cs == 1) ? "client-to-server " : "server-to-client ", |
167 | ciphername); |
168 | fflush(stderr); |
169 | |
170 | { |
171 | struct termios oldmode, newmode; |
172 | tcgetattr(0, &oldmode); |
173 | newmode = oldmode; |
174 | newmode.c_lflag |= ECHO | ISIG | ICANON; |
175 | tcsetattr(0, TCSANOW, &newmode); |
176 | line[0] = '\0'; |
177 | read(0, line, sizeof(line) - 1); |
178 | tcsetattr(0, TCSANOW, &oldmode); |
179 | } |
180 | |
181 | if (line[0] == 'y' || line[0] == 'Y') { |
182 | return; |
183 | } else { |
184 | fprintf(stderr, abandoned); |
185 | cleanup_exit(0); |
186 | } |
187 | } |
188 | |
189 | /* |
190 | * Ask whether to wipe a session log file before writing to it. |
191 | * Returns 2 for wipe, 1 for append, 0 for cancel (don't log). |
192 | */ |
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193 | int askappend(void *frontend, Filename filename) |
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194 | { |
195 | static const char msgtemplate[] = |
196 | "The session log file \"%.*s\" already exists.\n" |
197 | "You can overwrite it with a new session log,\n" |
198 | "append your session log to the end of it,\n" |
199 | "or disable session logging for this session.\n" |
200 | "Enter \"y\" to wipe the file, \"n\" to append to it,\n" |
201 | "or just press Return to disable logging.\n" |
202 | "Wipe the log file? (y/n, Return cancels logging) "; |
203 | |
204 | static const char msgtemplate_batch[] = |
205 | "The session log file \"%.*s\" already exists.\n" |
206 | "Logging will not be enabled.\n"; |
207 | |
208 | char line[32]; |
209 | |
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210 | if (console_batch_mode) { |
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211 | fprintf(stderr, msgtemplate_batch, FILENAME_MAX, filename.path); |
c5e438ec |
212 | fflush(stderr); |
213 | return 0; |
214 | } |
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215 | fprintf(stderr, msgtemplate, FILENAME_MAX, filename.path); |
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216 | fflush(stderr); |
217 | |
218 | { |
219 | struct termios oldmode, newmode; |
220 | tcgetattr(0, &oldmode); |
221 | newmode = oldmode; |
222 | newmode.c_lflag |= ECHO | ISIG | ICANON; |
223 | tcsetattr(0, TCSANOW, &newmode); |
224 | line[0] = '\0'; |
225 | read(0, line, sizeof(line) - 1); |
226 | tcsetattr(0, TCSANOW, &oldmode); |
227 | } |
228 | |
229 | if (line[0] == 'y' || line[0] == 'Y') |
230 | return 2; |
231 | else if (line[0] == 'n' || line[0] == 'N') |
232 | return 1; |
233 | else |
234 | return 0; |
235 | } |
236 | |
237 | /* |
238 | * Warn about the obsolescent key file format. |
239 | * |
240 | * Uniquely among these functions, this one does _not_ expect a |
241 | * frontend handle. This means that if PuTTY is ported to a |
242 | * platform which requires frontend handles, this function will be |
243 | * an anomaly. Fortunately, the problem it addresses will not have |
244 | * been present on that platform, so it can plausibly be |
245 | * implemented as an empty function. |
246 | */ |
247 | void old_keyfile_warning(void) |
248 | { |
249 | static const char message[] = |
250 | "You are loading an SSH 2 private key which has an\n" |
251 | "old version of the file format. This means your key\n" |
252 | "file is not fully tamperproof. Future versions of\n" |
253 | "PuTTY may stop supporting this private key format,\n" |
254 | "so we recommend you convert your key to the new\n" |
255 | "format.\n" |
256 | "\n" |
257 | "Once the key is loaded into PuTTYgen, you can perform\n" |
258 | "this conversion simply by saving it again.\n"; |
259 | |
260 | fputs(message, stderr); |
261 | } |
262 | |
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263 | void console_provide_logctx(void *logctx) |
264 | { |
265 | console_logctx = logctx; |
266 | } |
267 | |
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268 | void logevent(void *frontend, const char *string) |
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269 | { |
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270 | if (console_logctx) |
271 | log_eventlog(console_logctx, string); |
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272 | } |
273 | |
274 | int console_get_line(const char *prompt, char *str, |
275 | int maxlen, int is_pw) |
276 | { |
277 | struct termios oldmode, newmode; |
278 | int i; |
279 | |
280 | if (console_batch_mode) { |
281 | if (maxlen > 0) |
282 | str[0] = '\0'; |
283 | } else { |
284 | tcgetattr(0, &oldmode); |
285 | newmode = oldmode; |
286 | newmode.c_lflag |= ISIG | ICANON; |
287 | if (is_pw) |
288 | newmode.c_lflag &= ~ECHO; |
289 | else |
290 | newmode.c_lflag |= ECHO; |
291 | tcsetattr(0, TCSANOW, &newmode); |
292 | |
293 | fputs(prompt, stdout); |
294 | fflush(stdout); |
295 | i = read(0, str, maxlen - 1); |
296 | |
297 | tcsetattr(0, TCSANOW, &oldmode); |
298 | |
299 | if (i > 0 && str[i-1] == '\n') |
300 | i--; |
301 | str[i] = '\0'; |
302 | |
303 | if (is_pw) |
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304 | fputs("\n", stdout); |
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305 | } |
306 | return 1; |
307 | } |
308 | |
309 | void frontend_keypress(void *handle) |
310 | { |
311 | /* |
312 | * This is nothing but a stub, in console code. |
313 | */ |
314 | return; |
315 | } |