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1 | /* -*-c-*- |
2 | * |
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3 | * $Id$ |
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4 | * |
5 | * Common code for Pixie client and server (Unix-specific) |
6 | * |
7 | * (c) 1999 Straylight/Edgeware |
8 | */ |
9 | |
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10 | /*----- Licensing notice --------------------------------------------------* |
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11 | * |
12 | * This file is part of Catacomb. |
13 | * |
14 | * Catacomb is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU Library General Public License as |
16 | * published by the Free Software Foundation; either version 2 of the |
17 | * License, or (at your option) any later version. |
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18 | * |
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19 | * Catacomb is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU Library General Public License for more details. |
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23 | * |
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24 | * You should have received a copy of the GNU Library General Public |
25 | * License along with Catacomb; if not, write to the Free |
26 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
27 | * MA 02111-1307, USA. |
28 | */ |
29 | |
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30 | /*----- Header files ------------------------------------------------------*/ |
31 | |
32 | #include <errno.h> |
33 | #include <stddef.h> |
34 | #include <stdio.h> |
35 | #include <stdlib.h> |
36 | #include <string.h> |
37 | |
38 | #include <sys/types.h> |
39 | #include <unistd.h> |
40 | #include <fcntl.h> |
41 | #include <termios.h> |
42 | #include <pwd.h> |
43 | |
44 | #include <sys/socket.h> |
45 | #include <sys/un.h> |
46 | |
47 | #include <mLib/alloc.h> |
48 | #include <mLib/dstr.h> |
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49 | #include <mLib/str.h> |
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50 | |
51 | #include "pixie.h" |
52 | |
53 | /*----- Main code ---------------------------------------------------------*/ |
54 | |
55 | /* --- @pixie_address@ --- * |
56 | * |
57 | * Arguments: @const char *sock@ = pointer to socket name |
58 | * @size_t *psz@ = where to write the address size |
59 | * |
60 | * Returns: Pointer to filled-in Unix-domain socket address. |
61 | * |
62 | * Use: Returns a Unix-domain socket address to use to find the |
63 | * passphrase pixie. |
64 | */ |
65 | |
66 | struct sockaddr_un *pixie_address(const char *sock, size_t *psz) |
67 | { |
68 | dstr d = DSTR_INIT; |
69 | |
70 | /* --- Get the default socket path if none specified --- */ |
71 | |
72 | if (!sock) |
73 | sock = getenv("CATACOMB_PIXIE_SOCKET"); |
74 | if (!sock) |
75 | sock = "%h/.catacomb/pixie"; |
76 | |
77 | /* --- Substitute interesting sequences in the path --- */ |
78 | |
79 | { |
80 | const char *q, *qq; |
81 | |
82 | q = sock; |
83 | for (;;) { |
84 | qq = strchr(q, '%'); |
85 | if (!qq || !qq[1]) { |
86 | DPUTS(&d, q); |
87 | break; |
88 | } |
89 | DPUTM(&d, q, qq - q); |
90 | q = qq + 1; |
91 | switch (*q) { |
92 | case 'u': |
93 | qq = getenv("USER"); |
94 | if (!qq) |
95 | qq = getenv("LOGNAME"); |
96 | if (!qq) { |
97 | struct passwd *pw = getpwuid(getuid()); |
98 | if (pw) |
99 | qq = pw->pw_name; |
100 | else |
101 | qq = "<unknown>"; |
102 | } |
103 | DPUTS(&d, qq); |
104 | break; |
105 | case 'h': |
106 | qq = getenv("HOME"); |
107 | if (!qq) { |
108 | struct passwd *pw = getpwuid(getuid()); |
109 | if (pw) |
110 | qq = pw->pw_dir; |
111 | else |
112 | qq = "<unknown>"; |
113 | } |
114 | DPUTS(&d, qq); |
115 | break; |
116 | default: |
117 | DPUTC(&d, '%'); |
118 | DPUTC(&d, *q); |
119 | break; |
120 | } |
121 | q++; |
122 | } |
123 | DPUTZ(&d); |
124 | } |
125 | |
126 | /* --- Allocate and initialize the socket address --- */ |
127 | |
128 | { |
129 | struct sockaddr_un *sun; |
130 | size_t bsz = offsetof(struct sockaddr_un, sun_path); |
131 | *psz = bsz + d.len + 1; |
132 | sun = xmalloc(bsz + d.len + 1); |
133 | memset(sun, 0, bsz); |
134 | sun->sun_family = AF_UNIX; |
135 | memcpy(sun->sun_path, d.buf, d.len + 1); |
136 | dstr_destroy(&d); |
137 | return (sun); |
138 | } |
139 | } |
140 | |
141 | /* --- @pixie_fdline@ --- * |
142 | * |
143 | * Arguments: @int fd@ = file descriptor to read from |
144 | * @char *buf@ = pointer to buffer |
145 | * @size_t sz@ = size of buffer |
146 | * |
147 | * Returns: --- |
148 | * |
149 | * Use: Reads a line from a file descriptor. The read is done one |
150 | * character at a time. If the entire line won't fit, the end |
151 | * is truncated. The line is null terminated. |
152 | */ |
153 | |
154 | void pixie_fdline(int fd, char *buf, size_t sz) |
155 | { |
156 | char *p = buf; |
157 | char *q = p + sz - 1; |
158 | |
159 | for (;;) { |
160 | char c; |
161 | if (read(fd, &c, 1) < 1) |
162 | break; |
163 | if (c == '\n') |
164 | break; |
165 | if (p < q) |
166 | *p++ = c; |
167 | } |
168 | *p = 0; |
169 | } |
170 | |
171 | /* --- @pixie_getpass@ --- * |
172 | * |
173 | * Arguments: @const char *prompt@ = pointer to prompt string |
174 | * @char *buf@ = pointer to buffer |
175 | * @size_t sz@ = size of buffer |
176 | * |
177 | * Returns: Zero if it worked OK, nonzero otherwise. |
178 | * |
179 | * Use: Reads a passphrase from the terminal or some other requested |
180 | * source. |
181 | */ |
182 | |
183 | int pixie_getpass(const char *prompt, char *buf, size_t sz) |
184 | { |
185 | const char *pfd = getenv("CATACOMB_PASSPHRASE_FD"); |
186 | int fd = 0; |
187 | |
188 | /* --- See whether a terminal is what's wanted --- */ |
189 | |
190 | if (pfd) { |
191 | fd = atoi(pfd); |
192 | pixie_fdline(fd, buf, sz); |
193 | } else { |
194 | struct termios ta; |
195 | struct termios ota; |
196 | char nl = '\n'; |
197 | |
198 | if ((fd = open("/dev/tty", O_RDWR)) < 0) |
199 | goto fail_0; |
200 | if (tcgetattr(fd, &ta) < 0) |
201 | goto fail_1; |
202 | ota = ta; |
203 | ta.c_lflag &= ~(ECHO | ISIG); |
204 | if (tcsetattr(fd, TCSAFLUSH, &ta)) |
205 | goto fail_1; |
206 | write(fd, prompt, strlen(prompt)); |
207 | pixie_fdline(fd, buf, sz); |
208 | tcsetattr(fd, TCSAFLUSH, &ota); |
209 | write(fd, &nl, 1); |
210 | close(fd); |
211 | } |
212 | return (0); |
213 | |
214 | /* --- Tidy up if things went wrong --- */ |
215 | |
216 | fail_1: |
217 | close(fd); |
218 | fail_0: |
219 | return (-1); |
220 | } |
221 | |
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222 | /* --- @pixie_open@ --- * |
223 | * |
224 | * Arguments: @const char *sock@ = path to pixie socket |
225 | * |
226 | * Returns: Less than zero if it failed, or file descriptor. |
227 | * |
228 | * Use: Opens a connection to a passphrase pixie. |
229 | */ |
230 | |
231 | int pixie_open(const char *sock) |
232 | { |
233 | struct sockaddr_un *sun; |
234 | size_t sz; |
235 | int fd; |
236 | |
237 | /* --- Open the connection --- */ |
238 | |
239 | if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) |
240 | goto fail_0; |
241 | sun = pixie_address(sock, &sz); |
242 | if (connect(fd, (struct sockaddr *)sun, sz)) |
243 | goto fail_1; |
244 | xfree(sun); |
245 | return (fd); |
246 | |
247 | /* --- Tidy up if things went wrong --- */ |
248 | |
249 | fail_1: |
250 | xfree(sun); |
251 | close(fd); |
252 | fail_0: |
253 | return (-1); |
254 | } |
255 | |
256 | /* --- @pixie_read@ --- * |
257 | * |
258 | * Arguments: @int fd@ = connection to passphrase pixie |
259 | * @const char *tag@ = pointer to tag string |
260 | * @unsigned mode@ = reading mode |
261 | * @char *buf@ = pointer to destination buffer |
262 | * @size_t sz@ = size of the buffer |
263 | * |
264 | * Returns: Zero if all went well, @-1@ if the read fails, @+1@ to |
265 | * request the passphrase from the user. |
266 | * |
267 | * Use: Reads a passphrase from the pixie. |
268 | */ |
269 | |
270 | int pixie_read(int fd, const char *tag, unsigned mode, char *buf, size_t sz) |
271 | { |
272 | dstr d = DSTR_INIT; |
273 | char *p, *q; |
274 | |
275 | /* --- Send the request --- */ |
276 | |
277 | dstr_putf(&d, "%s %s\n", mode == PMODE_READ ? "PASS" : "VERIFY", tag); |
278 | write(fd, d.buf, d.len); |
279 | dstr_destroy(&d); |
280 | |
281 | /* --- Sort out the result --- */ |
282 | |
283 | again: |
284 | pixie_fdline(fd, buf, sz); |
285 | p = buf; |
286 | if ((q = str_getword(&p)) == 0) |
287 | return (-1); |
288 | if (strcmp(q, "INFO") == 0) |
289 | goto again; |
290 | else if (strcmp(q, "MISSING") == 0) |
291 | return (+1); |
292 | else if (strcmp(q, "OK") != 0) |
293 | return (-1); |
294 | |
295 | /* --- Return the final answer --- */ |
296 | |
297 | if (p) |
298 | memmove(buf, p, strlen(p) + 1); |
299 | else |
300 | *buf = 0; |
301 | return (0); |
302 | } |
303 | |
304 | /* --- @pixie_set@ --- * |
305 | * |
306 | * Arguments: @int fd@ = pixie file descriptor |
307 | * @const char *tag@ = pointer to tag string |
308 | * @const char *phrase@ = pointer to passphrase string |
309 | * |
310 | * Returns: --- |
311 | * |
312 | * Use: Sends a passphrase to the passphrase pixie. |
313 | */ |
314 | |
315 | void pixie_set(int fd, const char *tag, const char *phrase) |
316 | { |
317 | dstr d = DSTR_INIT; |
318 | char buf[16]; |
319 | size_t sz = strlen(phrase); |
320 | char nl = '\n'; |
321 | char *p, *q; |
322 | |
323 | /* --- Send the request --- * |
324 | * |
325 | * I didn't want to copy it out of the caller's buffer. @writev@ may |
326 | * produce a copy, too, so I didn't do that either. |
327 | */ |
328 | |
329 | dstr_putf(&d, "SET %s -- ", tag); |
330 | write(fd, d.buf, d.len); |
331 | write(fd, phrase, sz); |
332 | write(fd, &nl, 1); |
333 | dstr_destroy(&d); |
334 | |
335 | /* --- Pick up the pieces --- */ |
336 | |
337 | again: |
338 | pixie_fdline(fd, buf, sizeof(buf)); |
339 | p = buf; |
340 | if ((q = str_getword(&p)) != 0 && strcmp(q, "INFO") == 0) |
341 | goto again; |
342 | } |
343 | |
344 | /* --- @pixie_cancel@ --- * |
345 | * |
346 | * Arguments: @int fd@ = pixie file descriptor |
347 | * @const char *tag@ = pointer to tag string |
348 | * |
349 | * Returns: --- |
350 | * |
351 | * Use: Cancels a passphrase if it turns out to be bogus. |
352 | */ |
353 | |
354 | void pixie_cancel(int fd, const char *tag) |
355 | { |
356 | dstr d = DSTR_INIT; |
357 | char buf[16]; |
358 | char *p, *q; |
359 | |
360 | /* --- Send the request --- */ |
361 | |
362 | dstr_putf(&d, "FLUSH %s\n", tag); |
363 | write(fd, d.buf, d.len); |
364 | dstr_destroy(&d); |
365 | |
366 | /* --- Sort out the result --- */ |
367 | |
368 | again: |
369 | pixie_fdline(fd, buf, sizeof(buf)); |
370 | p = buf; |
371 | if ((q = str_getword(&p)) != 0 && strcmp(q, "INFO") == 0) |
372 | goto again; |
373 | } |
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374 | |
375 | /*----- That's all, folks -------------------------------------------------*/ |
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376 | |