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-rw-r--r--kerberosIV/kafs/common.c340
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+/* $KTH: common.c,v 1.3 1997/11/03 20:35:24 bg Exp $ */
+
+/*
+ * Copyright (c) 1997 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden).
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by Kungliga Tekniska
+ * Högskolan and its contributors.
+ *
+ * 4. Neither the name of the Institute nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include "kafs_locl.h"
+
+#define AUTH_SUPERUSER "afs"
+
+/*
+ * Here only ASCII characters are relevant.
+ */
+
+#define IsAsciiLower(c) ('a' <= (c) && (c) <= 'z')
+
+#define ToAsciiUpper(c) ((c) - 'a' + 'A')
+
+static void
+foldup(char *a, const char *b)
+{
+ for (; *b; a++, b++)
+ if (IsAsciiLower(*b))
+ *a = ToAsciiUpper(*b);
+ else
+ *a = *b;
+ *a = '\0';
+}
+
+int
+kafs_settoken(const char *cell, uid_t uid, CREDENTIALS *c)
+{
+ struct ViceIoctl parms;
+ struct ClearToken ct;
+ int32_t sizeof_x;
+ char buf[2048], *t;
+ int ret;
+
+ /*
+ * Build a struct ClearToken
+ */
+ ct.AuthHandle = c->kvno;
+ memcpy (ct.HandShakeKey, c->session, sizeof(c->session));
+ ct.ViceId = uid; /* is this always valid? */
+ ct.BeginTimestamp = 1 + c->issue_date;
+ ct.EndTimestamp = krb_life_to_time(c->issue_date, c->lifetime);
+
+#define ODD(x) ((x) & 1)
+ /* If we don't know the numerical ID lifetime should be even? */
+ if (uid == 0 && ODD(ct.EndTimestamp - ct.BeginTimestamp))
+ ct.BeginTimestamp--;
+
+ t = buf;
+ /*
+ * length of secret token followed by secret token
+ */
+ sizeof_x = c->ticket_st.length;
+ memcpy(t, &sizeof_x, sizeof(sizeof_x));
+ t += sizeof(sizeof_x);
+ memcpy(t, c->ticket_st.dat, sizeof_x);
+ t += sizeof_x;
+ /*
+ * length of clear token followed by clear token
+ */
+ sizeof_x = sizeof(ct);
+ memcpy(t, &sizeof_x, sizeof(sizeof_x));
+ t += sizeof(sizeof_x);
+ memcpy(t, &ct, sizeof_x);
+ t += sizeof_x;
+
+ /*
+ * do *not* mark as primary cell
+ */
+ sizeof_x = 0;
+ memcpy(t, &sizeof_x, sizeof(sizeof_x));
+ t += sizeof(sizeof_x);
+ /*
+ * follow with cell name
+ */
+ sizeof_x = strlen(cell) + 1;
+ memcpy(t, cell, sizeof_x);
+ t += sizeof_x;
+
+ /*
+ * Build argument block
+ */
+ parms.in = buf;
+ parms.in_size = t - buf;
+ parms.out = 0;
+ parms.out_size = 0;
+ ret = k_pioctl(0, VIOCSETTOK, &parms, 0);
+ return ret;
+}
+
+#if 0
+/* Try to get a db-server for an AFS cell from a AFSDB record */
+
+static int
+dns_find_cell(const char *cell, char *dbserver)
+{
+ struct dns_reply *r;
+ int ok = -1;
+ r = dns_lookup(cell, "afsdb");
+ if(r){
+ struct resource_record *rr = r->head;
+ while(rr){
+ if(rr->type == T_AFSDB && rr->u.afsdb->preference == 1){
+ strncpy(dbserver, rr->u.afsdb->domain, MAXHOSTNAMELEN);
+ dbserver[MaxHostNameLen - 1] = 0;
+ ok = 0;
+ break;
+ }
+ rr = rr->next;
+ }
+ dns_free_data(r);
+ }
+ return ok;
+}
+#endif
+
+
+/*
+ * Try to find the cells we should try to klog to in "file".
+ */
+static void
+find_cells(char *file, char ***cells, int *index)
+{
+ FILE *f;
+ char cell[64];
+ int i;
+ f = fopen(file, "r");
+ if (f == NULL)
+ return;
+ while (fgets(cell, sizeof(cell), f)) {
+ char *nl = strchr(cell, '\n');
+ if (nl) *nl = 0;
+ for(i = 0; i < *index; i++)
+ if(strcmp((*cells)[i], cell) == 0)
+ break;
+ if(i == *index){
+ *cells = realloc(*cells, (*index + 1) * sizeof(**cells));
+ (*cells)[(*index)++] = strdup(cell);
+ }
+ }
+ fclose(f);
+}
+
+/*
+ * Get tokens for all cells[]
+ */
+static int
+afslog_cells(kafs_data *data, char **cells, int max, uid_t uid)
+{
+ int ret = 0;
+ int i;
+ for(i = 0; i < max; i++)
+ ret = (*data->afslog_uid)(data, cells[i], uid);
+ return ret;
+}
+
+int
+_kafs_afslog_all_local_cells(kafs_data *data, uid_t uid)
+{
+ int ret;
+ char **cells = NULL;
+ int index = 0;
+
+ char *p;
+
+ if ((p = getenv("HOME"))) {
+ char home[MAXPATHLEN];
+ snprintf(home, sizeof(home), "%s/.TheseCells", p);
+ find_cells(home, &cells, &index);
+ }
+ find_cells(_PATH_THESECELLS, &cells, &index);
+ find_cells(_PATH_THISCELL, &cells, &index);
+
+ ret = afslog_cells(data, cells, index, uid);
+ while(index > 0)
+ free(cells[--index]);
+ free(cells);
+ return ret;
+}
+
+
+/* Find the realm associated with cell. Do this by opening
+ /usr/vice/etc/CellServDB and getting the realm-of-host for the
+ first VL-server for the cell.
+
+ This does not work when the VL-server is living in one realm, but
+ the cell it is serving is living in another realm.
+
+ Return 0 on success, -1 otherwise.
+ */
+
+static int
+realm_of_cell(kafs_data *data, const char *cell, char **realm)
+{
+ FILE *F;
+ char buf[1024];
+ char *p;
+ int ret = -1;
+
+ if ((F = fopen(_PATH_CELLSERVDB, "r")))
+ {
+ while (fgets(buf, sizeof(buf), F))
+ {
+ if (buf[0] != '>')
+ continue; /* Not a cell name line, try next line */
+ if (strncmp(buf + 1, cell, strlen(cell)) == 0)
+ {
+ /*
+ * We found the cell name we're looking for.
+ * Read next line on the form ip-address '#' hostname
+ */
+ if (fgets(buf, sizeof(buf), F) == NULL)
+ break; /* Read failed, give up */
+ p = strchr(buf, '#');
+ if (p == NULL)
+ break; /* No '#', give up */
+ p++;
+ if (buf[strlen(buf) - 1] == '\n')
+ buf[strlen(buf) - 1] = 0;
+ *realm = (*data->get_realm)(data, p);
+ if (*realm && **realm != 0)
+ ret = 0;
+ break; /* Won't try any more */
+ }
+ }
+ fclose(F);
+ }
+#if 0
+ if (realm == NULL) {
+ if (dns_find_cell(cell, buf) == 0)
+ realm = krb_realmofhost(buf);
+ }
+#endif
+ return ret;
+}
+
+int
+_kafs_get_cred(kafs_data *data,
+ const char *cell,
+ const char *krealm,
+ const char *lrealm,
+ CREDENTIALS *c)
+{
+ int ret = -1;
+ char *vl_realm;
+ char CELL[64];
+
+ /* We're about to find the the realm that holds the key for afs in
+ * the specified cell. The problem is that null-instance
+ * afs-principals are common and that hitting the wrong realm might
+ * yield the wrong afs key. The following assumptions were made.
+ *
+ * Any realm passed to us is preferred.
+ *
+ * If there is a realm with the same name as the cell, it is most
+ * likely the correct realm to talk to.
+ *
+ * In most (maybe even all) cases the database servers of the cell
+ * will live in the realm we are looking for.
+ *
+ * Try the local realm, but if the previous cases fail, this is
+ * really a long shot.
+ *
+ */
+
+ /* comments on the ordering of these tests */
+
+ /* If the user passes a realm, she probably knows something we don't
+ * know and we should try afs@krealm (otherwise we're talking with a
+ * blondino and she might as well have it.)
+ */
+
+ if (krealm) {
+ ret = (*data->get_cred)(data, AUTH_SUPERUSER, cell, krealm, c);
+ if (ret == 0) return 0;
+ ret = (*data->get_cred)(data, AUTH_SUPERUSER, "", krealm, c);
+ }
+ if (ret == 0) return 0;
+
+ foldup(CELL, cell);
+
+ ret = (*data->get_cred)(data, AUTH_SUPERUSER, cell, CELL, c);
+ if (ret == 0) return 0;
+
+ ret = (*data->get_cred)(data, AUTH_SUPERUSER, "", CELL, c);
+ if (ret == 0) return 0;
+
+ /* this might work in some cases */
+ if (realm_of_cell(data, cell, &vl_realm) == 0) {
+ ret = (*data->get_cred)(data, AUTH_SUPERUSER, cell, vl_realm, c);
+ if (ret)
+ ret = (*data->get_cred)(data, AUTH_SUPERUSER, "", vl_realm, c);
+ free(vl_realm);
+ if (ret == 0) return 0;
+ }
+
+ if (lrealm)
+ ret = (*data->get_cred)(data, AUTH_SUPERUSER, cell, lrealm, c);
+ return ret;
+}
+
+
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