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1 | /* $Id$ | |
2 | * | |
3 | * Reg_svr protocol and encryption/decryption routines | |
4 | * | |
5 | * Copyright (C) 1998 by the Massachusetts Institute of Technology | |
6 | * For copying and distribution information, please see the file | |
7 | * <mit-copyright.h>. | |
8 | * | |
9 | */ | |
10 | ||
11 | #include <mit-copyright.h> | |
12 | #include <moira.h> | |
13 | #include "reg_svr.h" | |
14 | ||
15 | #include <sys/stat.h> | |
16 | ||
17 | #include <fcntl.h> | |
18 | #include <stdarg.h> | |
19 | #include <stdio.h> | |
20 | #include <stdlib.h> | |
21 | #include <string.h> | |
22 | #include <unistd.h> | |
23 | ||
24 | #include <com_err.h> | |
25 | #include <des.h> | |
26 | ||
27 | /* RSARef includes */ | |
28 | #include "global.h" | |
29 | #include "rsaref.h" | |
30 | ||
31 | RCSID("$Header$"); | |
32 | ||
33 | R_RSA_PRIVATE_KEY *rsa_key; | |
34 | char *emsg[NUM_REG_ERRORS], *ename[NUM_REG_ERRORS]; | |
35 | extern char *whoami; | |
36 | ||
37 | struct _handler { | |
38 | char *name; | |
39 | void (*handler)(reg_client *rc, int argc, char **argv); | |
40 | } handlers[] = { | |
41 | { "RIFO", RIFO }, | |
42 | { "SWRD", SWRD }, | |
43 | { "LOGN", LOGN }, | |
44 | { "PSWD", PSWD }, | |
45 | { "QUIT", QUIT }, | |
46 | { "SPIN", SPIN }, | |
47 | { NULL, NULL } | |
48 | }; | |
49 | ||
50 | void parse_pdu(reg_client *rc, long len, char *buf); | |
51 | void printhex(unsigned char *buf, int len); | |
52 | ||
53 | int read_rsa_key(void) | |
54 | { | |
55 | struct stat statbuf; | |
56 | int fd; | |
57 | ||
58 | if (stat(REG_SVR_RSA_KEY, &statbuf)) | |
59 | return 0; | |
60 | ||
61 | fd = open(REG_SVR_RSA_KEY, O_RDONLY); | |
62 | if (!fd) | |
63 | return 0; | |
64 | ||
65 | rsa_key = malloc(statbuf.st_size); | |
66 | if (!rsa_key) | |
67 | return 0; | |
68 | ||
69 | if (read(fd, rsa_key, statbuf.st_size) != statbuf.st_size) | |
70 | return 0; | |
71 | ||
72 | close(fd); | |
73 | return 1; | |
74 | } | |
75 | ||
76 | int read_errors(void) | |
77 | { | |
78 | int i; | |
79 | char errbuf[100], *p; | |
80 | FILE *errs; | |
81 | ||
82 | errs = fopen(REG_SVR_ERROR_MESSAGES, "r"); | |
83 | if (!errs) | |
84 | return 0; | |
85 | for (i = 0; i < NUM_REG_ERRORS && !feof(errs); i++) | |
86 | { | |
87 | if (errbuf[0] != '#' || errbuf[1] != ' ') | |
88 | sprintf(errbuf, "# %d", i); | |
89 | ename[i] = strdup(errbuf + 2); | |
90 | if (ename[i][strlen(ename[i]) - 1] == '\n') | |
91 | ename[i][strlen(ename[i]) - 1] = '\0'; | |
92 | emsg[i] = strdup(""); | |
93 | if (!ename[i] || !emsg[i]) | |
94 | return 0; | |
95 | while (1) { | |
96 | if (!fgets(errbuf, sizeof(errbuf) - 1, errs)) | |
97 | break; | |
98 | if (*errbuf == '#') | |
99 | break; | |
100 | ||
101 | if ((p = strchr(errbuf, '\n')) > errbuf) | |
102 | { | |
103 | *p = ' '; | |
104 | *(p + 1) = '\0'; | |
105 | } | |
106 | emsg[i] = realloc(emsg[i], strlen(emsg[i]) + strlen(errbuf) + 1); | |
107 | if (!emsg[i]) | |
108 | return 0; | |
109 | strcat(emsg[i], errbuf); | |
110 | } | |
111 | } | |
112 | fclose(errs); | |
113 | ||
114 | if (i < NUM_REG_ERRORS) | |
115 | { | |
116 | com_err(whoami, 0, "Not enough error messages in %s", | |
117 | REG_SVR_ERROR_MESSAGES); | |
118 | exit(1); | |
119 | } | |
120 | return 1; | |
121 | } | |
122 | ||
123 | void parse_packet(reg_client *rc, int type, long len, char *buf, int sleeping) | |
124 | { | |
125 | switch (type) | |
126 | { | |
127 | case REG_RSA_ENCRYPTED_KEY: | |
128 | { | |
129 | unsigned char key[MAX_ENCRYPTED_KEY_LEN]; | |
130 | unsigned int keylen; | |
131 | ||
132 | if (RSAPrivateDecrypt(key, &keylen, buf, len, rsa_key) || keylen != 8) | |
133 | { | |
134 | reply(rc, ENCRYPT_KEY, "INIT", "c", NULL); | |
135 | return; | |
136 | } | |
137 | des_key_sched(key, rc->sched); | |
138 | rc->encrypted = 1; | |
139 | ||
140 | if (sleeping) | |
141 | reply(rc, DATABASE_CLOSED, "INIT", "c", NULL); | |
142 | else | |
143 | reply(rc, NO_MESSAGE, "GETN", "c", NULL); | |
144 | return; | |
145 | } | |
146 | ||
147 | case REG_ENCRYPTED: | |
148 | { | |
149 | char *outbuf, iv[8] = {0, 0, 0, 0, 0, 0, 0, 0}; | |
150 | ||
151 | if (!rc->encrypted) | |
152 | { | |
153 | reply(rc, INTERNAL_ERROR, "INIT", "c", NULL, | |
154 | "Encrypted packet unexpected"); | |
155 | return; | |
156 | } | |
157 | ||
158 | outbuf = malloc(len + 7); | |
159 | if (!outbuf) | |
160 | { | |
161 | reply(rc, INTERNAL_ERROR, "INIT", "c", NULL, "Out of memory"); | |
162 | return; | |
163 | } | |
164 | des_cbc_encrypt(buf, outbuf, len, rc->sched, iv, 0); | |
165 | ||
166 | /* Undo PKCS#5 padding */ | |
167 | len -= outbuf[len - 1]; | |
168 | ||
169 | parse_pdu(rc, len - 8, outbuf + 8); | |
170 | free(outbuf); | |
171 | return; | |
172 | } | |
173 | ||
174 | #ifdef ALLOW_UNENCRYPTED | |
175 | case REG_UNENCRYPTED: | |
176 | parse_pdu(rc, len, buf); | |
177 | return; | |
178 | #endif | |
179 | ||
180 | default: | |
181 | com_err(whoami, 0, "Bad packet (type %d, len %d)", type, len); | |
182 | rc->lastmod = 0; | |
183 | } | |
184 | } | |
185 | ||
186 | void parse_pdu(reg_client *rc, long len, char *buf) | |
187 | { | |
188 | char **argv, *p; | |
189 | int argc, i; | |
190 | void (*handler)(reg_client *rc, int argc, char **argv) = NULL; | |
191 | ||
192 | if (len < 8 || strcmp(buf, "v1")) | |
193 | { | |
194 | com_err(whoami, 0, "Bad packet version number %s", buf); | |
195 | reply(rc, PROTOCOL_ERROR, "INIT", "c", NULL); | |
196 | return; | |
197 | } | |
198 | buf += 3; | |
199 | len -= 3; | |
200 | ||
201 | for (i = 0; handlers[i].name; i++) | |
202 | { | |
203 | if (!strcmp(buf, handlers[i].name)) | |
204 | { | |
205 | handler = handlers[i].handler; | |
206 | break; | |
207 | } | |
208 | } | |
209 | if (!handler) | |
210 | { | |
211 | com_err(whoami, 0, "Bad packet request %s", buf); | |
212 | reply(rc, PROTOCOL_ERROR, "INIT", "c", NULL); | |
213 | return; | |
214 | } | |
215 | buf += 5; | |
216 | len -= 5; | |
217 | ||
218 | for (argc = 0, p = buf; p < buf + len; p++) | |
219 | { | |
220 | if (!*p) | |
221 | argc++; | |
222 | } | |
223 | ||
224 | argv = malloc(argc * sizeof(char *)); | |
225 | if (!argv) | |
226 | { | |
227 | com_err(whoami, 0, "in parse_pdu"); | |
228 | reply(rc, INTERNAL_ERROR, "INIT", "c", NULL, "Out of memory"); | |
229 | return; | |
230 | } | |
231 | ||
232 | fprintf(stderr, "%s[#%d]: %s", whoami, rc->clientid, handlers[i].name); | |
233 | for (argc = 0, p = buf - 1; p < buf + len - 1; p++) | |
234 | { | |
235 | if (!*p) | |
236 | { | |
237 | argv[argc++] = p + 1; | |
238 | if (strcmp(handlers[i].name, "PSWD") != 0) | |
239 | fprintf(stderr, " '%s'", p + 1); | |
240 | } | |
241 | } | |
242 | fprintf(stderr, "\n"); | |
243 | fflush(stderr); | |
244 | ||
245 | for (i = 0; i < argc; i++) | |
246 | strtrim(argv[i]); | |
247 | handler(rc, argc, argv); | |
248 | free(argv); | |
249 | } | |
250 | ||
251 | void reply(reg_client *rc, int msg, char *state, char *clean, char *data, | |
252 | ...) | |
253 | { | |
254 | /* reply() can't malloc, since it might be returning an "out of memory" | |
255 | error. We'll use a static buffer which is much larger than any | |
256 | message we'd be returning, and callers have to make sure that any | |
257 | user-generated data is length-limited. */ | |
258 | static char buf[8192], outbuf[8192]; | |
259 | char *p; | |
260 | int len, pad, pcount; | |
261 | va_list ap; | |
262 | long junk; | |
263 | unsigned short *nrand; | |
264 | ||
265 | com_err(whoami, 0, "Reply: %s, go to state %s %s", ename[msg], state, clean); | |
266 | ||
267 | seed48(rc->random); | |
268 | junk = lrand48(); | |
269 | memcpy(buf + 3, &junk, 4); | |
270 | junk = lrand48(); | |
271 | memcpy(buf + 7, &junk, 4); | |
272 | nrand = seed48(rc->random); | |
273 | memcpy(rc->random, nrand, 6); | |
274 | ||
275 | memcpy(buf + 11, "v1", 3); | |
276 | memcpy(buf + 14, state, len = strlen(state) + 1); | |
277 | p = buf + 14 + len; | |
278 | va_start(ap, data); | |
279 | p += vsprintf(p, emsg[msg], ap); | |
280 | va_end(ap); | |
281 | *p++ = '\0'; | |
282 | memcpy(p, clean, len = strlen(clean) + 1); | |
283 | p += len; | |
284 | if (data) | |
285 | { | |
286 | memcpy(p, data, len = strlen(data) + 1); | |
287 | p += len; | |
288 | } | |
289 | ||
290 | len = p - (buf + 3); | |
291 | pad = 8 - len % 8; | |
292 | for (pcount = pad; pcount; pcount--) | |
293 | buf[3 + len++] = pad; | |
294 | ||
295 | if (rc->encrypted) | |
296 | { | |
297 | char iv[8] = {0, 0, 0, 0, 0, 0, 0, 0}; | |
298 | ||
299 | des_cbc_encrypt(buf + 3, outbuf + 3, len, rc->sched, iv, 1); | |
300 | p = outbuf; | |
301 | *p = REG_ENCRYPTED; | |
302 | } | |
303 | else | |
304 | { | |
305 | p = buf; | |
306 | *p = REG_UNENCRYPTED; | |
307 | } | |
308 | ||
309 | p[1] = len / 256; | |
310 | p[2] = len % 256; | |
311 | write(rc->fd, p, len + 3); | |
312 | ||
313 | /* If we're going to INIT, set lastmod to 0 to cause the connection | |
314 | to be closed once we return to the main loop */ | |
315 | if (!strcmp(state, "INIT")) | |
316 | rc->lastmod = 0; | |
317 | } | |
318 | ||
319 | char hexd[] = { '0', '1', '2', '3', '4', '5', '6', '7', | |
320 | '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' }; | |
321 | ||
322 | void printhex(unsigned char *buf, int len) | |
323 | { | |
324 | while (len--) | |
325 | { | |
326 | printf("%c%c", hexd[*buf>>4], hexd[*buf%0x10]); | |
327 | buf++; | |
328 | } | |
329 | printf("\n"); | |
330 | } |