2 * Copyright (c) 1997, 1998, 1999 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
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34 #include "kafs_locl.h"
36 RCSID("$Id: common.c,v 1.19 1999/12/02 16:58:40 joda Exp $");
38 #define AUTH_SUPERUSER "afs"
41 * Here only ASCII characters are relevant.
44 #define IsAsciiLower(c) ('a' <= (c) && (c) <= 'z')
46 #define ToAsciiUpper(c) ((c) - 'a' + 'A')
49 foldup(char *a, const char *b)
53 *a = ToAsciiUpper(*b);
60 kafs_settoken(const char *cell, uid_t uid, CREDENTIALS *c)
62 struct ViceIoctl parms;
69 * Build a struct ClearToken
71 ct.AuthHandle = c->kvno;
72 memcpy (ct.HandShakeKey, c->session, sizeof(c->session));
74 ct.BeginTimestamp = c->issue_date;
75 ct.EndTimestamp = krb_life_to_time(c->issue_date, c->lifetime);
76 if(ct.EndTimestamp < time(NULL))
77 return 0; /* don't store tokens that has expired (and possibly
78 overwriting valid tokens)*/
80 #define ODD(x) ((x) & 1)
81 /* According to Transarc conventions ViceId is valid iff
82 * (EndTimestamp - BeginTimestamp) is odd. By decrementing EndTime
83 * the transformations:
85 * (issue_date, life) -> (StartTime, EndTime) -> (issue_date, life)
86 * preserves the original values.
88 if (uid != 0) /* valid ViceId */
90 if (!ODD(ct.EndTimestamp - ct.BeginTimestamp))
93 else /* not valid ViceId */
95 if (ODD(ct.EndTimestamp - ct.BeginTimestamp))
101 * length of secret token followed by secret token
103 sizeof_x = c->ticket_st.length;
104 memcpy(t, &sizeof_x, sizeof(sizeof_x));
105 t += sizeof(sizeof_x);
106 memcpy(t, c->ticket_st.dat, sizeof_x);
109 * length of clear token followed by clear token
111 sizeof_x = sizeof(ct);
112 memcpy(t, &sizeof_x, sizeof(sizeof_x));
113 t += sizeof(sizeof_x);
114 memcpy(t, &ct, sizeof_x);
118 * do *not* mark as primary cell
121 memcpy(t, &sizeof_x, sizeof(sizeof_x));
122 t += sizeof(sizeof_x);
124 * follow with cell name
126 sizeof_x = strlen(cell) + 1;
127 memcpy(t, cell, sizeof_x);
131 * Build argument block
134 parms.in_size = t - buf;
137 ret = k_pioctl(0, VIOCSETTOK, &parms, 0);
141 /* Try to get a db-server for an AFS cell from a AFSDB record */
144 dns_find_cell(const char *cell, char *dbserver, size_t len)
148 r = dns_lookup(cell, "afsdb");
150 struct resource_record *rr = r->head;
152 if(rr->type == T_AFSDB && rr->u.afsdb->preference == 1){
168 * Try to find the cells we should try to klog to in "file".
171 find_cells(char *file, char ***cells, int *index)
178 f = fopen(file, "r");
181 while (fgets(cell, sizeof(cell), f)) {
183 t = cell + strlen(cell);
184 for (; t >= cell; t--)
185 if (*t == '\n' || *t == '\t' || *t == ' ')
187 if (cell[0] == '\0' || cell[0] == '#')
189 for(i = 0; i < ind; i++)
190 if(strcmp((*cells)[i], cell) == 0)
195 tmp = realloc(*cells, (ind + 1) * sizeof(**cells));
199 (*cells)[ind] = strdup(cell);
200 if ((*cells)[ind] == NULL)
210 * Get tokens for all cells[]
213 afslog_cells(kafs_data *data, char **cells, int max, uid_t uid,
218 for (i = 0; i < max; i++) {
219 int er = (*data->afslog_uid)(data, cells[i], 0, uid, homedir);
227 _kafs_afslog_all_local_cells(kafs_data *data, uid_t uid, const char *homedir)
234 homedir = getenv("HOME");
235 if (homedir != NULL) {
236 char home[MaxPathLen];
237 snprintf(home, sizeof(home), "%s/.TheseCells", homedir);
238 find_cells(home, &cells, &index);
240 find_cells(_PATH_THESECELLS, &cells, &index);
241 find_cells(_PATH_THISCELL, &cells, &index);
242 find_cells(_PATH_ARLA_THESECELLS, &cells, &index);
243 find_cells(_PATH_ARLA_THISCELL, &cells, &index);
245 ret = afslog_cells(data, cells, index, uid, homedir);
247 free(cells[--index]);
253 /* Find the realm associated with cell. Do this by opening
254 /usr/vice/etc/CellServDB and getting the realm-of-host for the
255 first VL-server for the cell.
257 This does not work when the VL-server is living in one realm, but
258 the cell it is serving is living in another realm.
260 Return 0 on success, -1 otherwise.
264 _kafs_realm_of_cell(kafs_data *data, const char *cell, char **realm)
271 if ((F = fopen(_PATH_CELLSERVDB, "r"))
272 || (F = fopen(_PATH_ARLA_CELLSERVDB, "r"))) {
273 while (fgets(buf, sizeof(buf), F)) {
275 continue; /* Not a cell name line, try next line */
276 if (strncmp(buf + 1, cell, strlen(cell)) == 0) {
278 * We found the cell name we're looking for.
279 * Read next line on the form ip-address '#' hostname
281 if (fgets(buf, sizeof(buf), F) == NULL)
282 break; /* Read failed, give up */
283 p = strchr(buf, '#');
285 break; /* No '#', give up */
287 if (buf[strlen(buf) - 1] == '\n')
288 buf[strlen(buf) - 1] = '\0';
289 *realm = (*data->get_realm)(data, p);
290 if (*realm && **realm != '\0')
292 break; /* Won't try any more */
297 if (*realm == NULL && dns_find_cell(cell, buf, sizeof(buf)) == 0) {
298 *realm = strdup(krb_realmofhost(buf));
306 _kafs_get_cred(kafs_data *data,
308 const char *realm_hint,
316 /* We're about to find the the realm that holds the key for afs in
317 * the specified cell. The problem is that null-instance
318 * afs-principals are common and that hitting the wrong realm might
319 * yield the wrong afs key. The following assumptions were made.
321 * Any realm passed to us is preferred.
323 * If there is a realm with the same name as the cell, it is most
324 * likely the correct realm to talk to.
326 * In most (maybe even all) cases the database servers of the cell
327 * will live in the realm we are looking for.
329 * Try the local realm, but if the previous cases fail, this is
330 * really a long shot.
334 /* comments on the ordering of these tests */
336 /* If the user passes a realm, she probably knows something we don't
337 * know and we should try afs@realm_hint (otherwise we're talking with a
338 * blondino and she might as well have it.)
342 ret = (*data->get_cred)(data, AUTH_SUPERUSER, cell, realm_hint, c);
343 if (ret == 0) return 0;
344 ret = (*data->get_cred)(data, AUTH_SUPERUSER, "", realm_hint, c);
345 if (ret == 0) return 0;
351 * If cell == realm we don't need no cross-cell authentication.
354 if (strcmp(CELL, realm) == 0) {
355 ret = (*data->get_cred)(data, AUTH_SUPERUSER, "", realm, c);
356 if (ret == 0) return 0;
357 /* Try afs.cell@REALM below. */
361 * If the AFS servers have a file /usr/afs/etc/krb.conf containing
362 * REALM we still don't have to resort to cross-cell authentication.
363 * Try afs.cell@REALM.
365 ret = (*data->get_cred)(data, AUTH_SUPERUSER, cell, realm, c);
366 if (ret == 0) return 0;
369 * We failed to get ``first class tickets'' for afs,
370 * fall back to cross-cell authentication.
374 ret = (*data->get_cred)(data, AUTH_SUPERUSER, "", CELL, c);
375 if (ret == 0) return 0;
376 ret = (*data->get_cred)(data, AUTH_SUPERUSER, cell, CELL, c);
377 if (ret == 0) return 0;
380 * Perhaps the cell doesn't correspond to any realm?
381 * Use realm of first volume location DB server.
382 * Try afs.cell@VL_REALM.
383 * Try afs@VL_REALM???
385 if (_kafs_realm_of_cell(data, cell, &vl_realm) == 0
386 && strcmp(vl_realm, realm) != 0
387 && strcmp(vl_realm, CELL) != 0) {
388 ret = (*data->get_cred)(data, AUTH_SUPERUSER, cell, vl_realm, c);
390 ret = (*data->get_cred)(data, AUTH_SUPERUSER, "", vl_realm, c);
392 if (ret == 0) return 0;