2 * CIFS user-space helper.
3 * Copyright (C) Igor Mammedov (niallain@gmail.com) 2007
4 * Copyright (C) Jeff Layton (jlayton@samba.org) 2010
6 * Used by /sbin/request-key for handling
7 * cifs upcall for kerberos authorization of access to share and
8 * cifs upcall for DFS srver name resolving (IPv4/IPv6 aware).
9 * You should have keyutils installed and add something like the
10 * following lines to /etc/request-key.conf file:
12 create cifs.spnego * * /usr/local/sbin/cifs.upcall %k
13 create dns_resolver * * /usr/local/sbin/cifs.upcall %k
15 * This program is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License as published by
17 * the Free Software Foundation; either version 2 of the License, or
18 * (at your option) any later version.
19 * This program 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 General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
30 #endif /* HAVE_CONFIG_H */
34 #ifdef HAVE_KRB5_KRB5_H
35 #include <krb5/krb5.h>
36 #elif defined(HAVE_KRB5_H)
41 #include <sys/types.h>
47 #include <arpa/inet.h>
51 #include "data_blob.h"
53 #include "cifs_spnego.h"
55 #define CIFS_DEFAULT_KRB5_DIR "/tmp"
56 #define CIFS_DEFAULT_KRB5_USER_DIR "/run/user/%U"
57 #define CIFS_DEFAULT_KRB5_PREFIX "krb5cc"
58 #define CIFS_DEFAULT_KRB5_KEYTAB "/etc/krb5.keytab"
60 #define MAX_CCNAME_LEN PATH_MAX + 5
62 static const char *prog = "cifs.upcall";
63 typedef enum _sectype {
70 * smb_krb5_principal_get_realm
72 * @brief Get realm of a principal
74 * @param[in] context The krb5_context
75 * @param[in] principal The principal
76 * @return pointer to the realm
80 static char *cifs_krb5_principal_get_realm(krb5_context context __attribute__ ((unused)),
81 krb5_principal principal)
83 #ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
84 return krb5_principal_get_realm(context, principal);
85 #elif defined(krb5_princ_realm) /* MIT */
87 realm = krb5_princ_realm(context, principal);
88 return (char *)realm->data;
94 #if !defined(HAVE_KRB5_FREE_UNPARSED_NAME)
95 static void krb5_free_unparsed_name(krb5_context context, char *val)
101 #if !defined(HAVE_KRB5_AUTH_CON_GETSENDSUBKEY) /* Heimdal */
102 static krb5_error_code
103 krb5_auth_con_getsendsubkey(krb5_context context,
104 krb5_auth_context auth_context,
105 krb5_keyblock **keyblock)
107 return krb5_auth_con_getlocalsubkey(context, auth_context, keyblock);
111 /* does the ccache have a valid TGT? */
112 static time_t get_tgt_time(const char *ccname)
114 krb5_context context;
118 krb5_principal principal;
122 if (krb5_init_context(&context)) {
123 syslog(LOG_DEBUG, "%s: unable to init krb5 context", __func__);
127 if (krb5_cc_resolve(context, ccname, &ccache)) {
128 syslog(LOG_DEBUG, "%s: unable to resolve krb5 cache", __func__);
132 if (krb5_cc_set_flags(context, ccache, 0)) {
133 syslog(LOG_DEBUG, "%s: unable to set flags", __func__);
137 if (krb5_cc_get_principal(context, ccache, &principal)) {
138 syslog(LOG_DEBUG, "%s: unable to get principal", __func__);
142 if (krb5_cc_start_seq_get(context, ccache, &cur)) {
143 syslog(LOG_DEBUG, "%s: unable to seq start", __func__);
147 if ((realm = cifs_krb5_principal_get_realm(context, principal)) == NULL) {
148 syslog(LOG_DEBUG, "%s: unable to get realm", __func__);
152 while (!credtime && !krb5_cc_next_cred(context, ccache, &cur, &creds)) {
154 if (krb5_unparse_name(context, creds.server, &name)) {
155 syslog(LOG_DEBUG, "%s: unable to unparse name",
159 if (krb5_realm_compare(context, creds.server, principal) &&
160 !strncasecmp(name, KRB5_TGS_NAME, KRB5_TGS_NAME_SIZE) &&
161 !strncasecmp(name + KRB5_TGS_NAME_SIZE + 1, realm,
163 && creds.times.endtime > time(NULL))
164 credtime = creds.times.endtime;
165 krb5_free_cred_contents(context, &creds);
166 krb5_free_unparsed_name(context, name);
169 krb5_cc_end_seq_get(context, ccache, &cur);
171 krb5_free_principal(context, principal);
173 #if defined(KRB5_TC_OPENCLOSE)
174 krb5_cc_set_flags(context, ccache, KRB5_TC_OPENCLOSE);
176 krb5_cc_close(context, ccache);
178 krb5_free_context(context);
182 static int krb5cc_filter(const struct dirent *dirent)
184 if (strstr(dirent->d_name, CIFS_DEFAULT_KRB5_PREFIX))
191 init_cc_from_keytab(const char *keytab_name, const char *user)
193 krb5_context context = NULL;
196 krb5_keytab keytab = NULL;
197 krb5_principal me = NULL;
198 krb5_ccache cc = NULL;
201 memset((char *) &my_creds, 0, sizeof(my_creds));
203 ret = krb5_init_context(&context);
205 syslog(LOG_DEBUG, "krb5_init_context: %d", (int)ret);
209 ret = krb5_kt_resolve(context, keytab_name, &keytab);
211 syslog(LOG_DEBUG, "krb5_kt_resolve: %d", (int)ret);
215 ret = krb5_parse_name(context, user, &me);
217 syslog(LOG_DEBUG, "krb5_parse_name: %d", (int)ret);
221 ret = krb5_get_init_creds_keytab(context, &my_creds, me,
222 keytab, 0, NULL, NULL);
224 syslog(LOG_DEBUG, "krb5_get_init_creds_keytab: %d", (int)ret);
228 ret = krb5_cc_default(context, &cc);
230 syslog(LOG_DEBUG, "krb5_cc_default: %d", (int)ret);
234 ret = krb5_cc_initialize(context, cc, me);
236 syslog(LOG_DEBUG, "krb5_cc_initialize: %d", (int)ret);
240 ret = krb5_cc_store_cred(context, cc, &my_creds);
242 syslog(LOG_DEBUG, "krb5_cc_store_cred: %d", (int)ret);
244 ccname = strdup(krb5_cc_default_name(context));
246 syslog(LOG_ERR, "Unable to allocate memory");
249 krb5_free_cred_contents(context, &my_creds);
252 krb5_free_principal(context, me);
254 krb5_cc_close(context, cc);
256 krb5_kt_close(context, keytab);
258 krb5_free_context(context);
262 /* resolve a pattern to an actual directory path */
263 static char *resolve_krb5_dir(const char *pattern, uid_t uid)
265 char name[MAX_CCNAME_LEN];
268 for (i = 0, j = 0; (pattern[i] != '\0') && (j < sizeof(name)); i++) {
269 switch (pattern[i]) {
271 switch (pattern[i + 1]) {
273 name[j++] = pattern[i];
277 j += snprintf(name + j, sizeof(name) - j,
278 "%lu", (unsigned long) uid);
284 name[j++] = pattern[i];
288 if ((j > 0) && (j < sizeof(name)))
289 return strndup(name, MAX_CCNAME_LEN);
294 /* search for a credcache that looks like a likely candidate */
295 static char *find_krb5_cc(const char *dirname, uid_t uid,
296 char **best_cache, time_t *best_time)
298 struct dirent **namelist;
300 char ccname[MAX_CCNAME_LEN], *credpath;
304 n = scandir(dirname, &namelist, krb5cc_filter, NULL);
306 syslog(LOG_DEBUG, "%s: scandir error on directory '%s': %s",
307 __func__, dirname, strerror(errno));
311 for (i = 0; i < n; i++) {
312 snprintf(ccname, sizeof(ccname), "FILE:%s/%s", dirname,
313 namelist[i]->d_name);
314 credpath = ccname + 5;
315 syslog(LOG_DEBUG, "%s: considering %s", __func__, credpath);
317 if (lstat(credpath, &sbuf)) {
318 syslog(LOG_DEBUG, "%s: stat error on '%s': %s",
319 __func__, credpath, strerror(errno));
323 if (sbuf.st_uid != uid) {
324 syslog(LOG_DEBUG, "%s: %s is owned by %u, not %u",
325 __func__, credpath, sbuf.st_uid, uid);
329 if (S_ISDIR(sbuf.st_mode)) {
330 snprintf(ccname, sizeof(ccname), "DIR:%s/%s", dirname,
331 namelist[i]->d_name);
332 credpath = ccname + 4;
334 if (!S_ISREG(sbuf.st_mode)) {
335 syslog(LOG_DEBUG, "%s: %s is not a regular file",
340 if (!(cred_time = get_tgt_time(ccname))) {
341 syslog(LOG_DEBUG, "%s: %s is not a valid credcache.",
347 if (cred_time <= *best_time) {
348 syslog(LOG_DEBUG, "%s: %s expires sooner than current "
349 "best.", __func__, ccname);
354 syslog(LOG_DEBUG, "%s: %s is valid ccache", __func__, ccname);
356 *best_cache = strndup(ccname, MAX_CCNAME_LEN);
357 *best_time = cred_time;
366 cifs_krb5_get_req(const char *host, const char *ccname,
367 DATA_BLOB * mechtoken, DATA_BLOB * sess_key)
371 krb5_context context;
373 krb5_creds in_creds, *out_creds;
374 krb5_data apreq_pkt, in_data;
375 krb5_auth_context auth_context = NULL;
376 #if defined(HAVE_KRB5_AUTH_CON_SETADDRS) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE)
377 static const uint8_t gss_cksum[24] = { 0x10, 0x00, /* ... */};
380 ret = krb5_init_context(&context);
382 syslog(LOG_DEBUG, "%s: unable to init krb5 context", __func__);
386 ret = krb5_cc_resolve(context, ccname, &ccache);
388 syslog(LOG_DEBUG, "%s: unable to resolve %s to ccache\n",
390 goto out_free_context;
393 memset(&in_creds, 0, sizeof(in_creds));
395 ret = krb5_cc_get_principal(context, ccache, &in_creds.client);
397 syslog(LOG_DEBUG, "%s: unable to get client principal name",
399 goto out_free_ccache;
402 ret = krb5_sname_to_principal(context, host, "cifs", KRB5_NT_UNKNOWN,
405 syslog(LOG_DEBUG, "%s: unable to convert sname to princ (%s).",
407 goto out_free_principal;
410 ret = krb5_get_credentials(context, 0, ccache, &in_creds, &out_creds);
411 krb5_free_principal(context, in_creds.server);
413 syslog(LOG_DEBUG, "%s: unable to get credentials for %s",
415 goto out_free_principal;
421 ret = krb5_auth_con_init(context, &auth_context);
423 syslog(LOG_DEBUG, "%s: unable to create auth_context: %d",
428 #if defined(HAVE_KRB5_AUTH_CON_SETADDRS) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE)
429 /* Ensure we will get an addressless ticket. */
430 ret = krb5_auth_con_setaddrs(context, auth_context, NULL, NULL);
432 syslog(LOG_DEBUG, "%s: unable to set NULL addrs: %d",
438 * Create a GSSAPI checksum (0x8003), see RFC 4121.
440 * The current layout is
442 * 0x10, 0x00, 0x00, 0x00 - length = 16
443 * 0x00, 0x00, 0x00, 0x00 - channel binding info - 16 zero bytes
444 * 0x00, 0x00, 0x00, 0x00
445 * 0x00, 0x00, 0x00, 0x00
446 * 0x00, 0x00, 0x00, 0x00
447 * 0x00, 0x00, 0x00, 0x00 - flags
449 * GSS_C_NO_CHANNEL_BINDINGS means 16 zero bytes,
450 * this is needed to work against some closed source
453 * See https://bugzilla.samba.org/show_bug.cgi?id=7890
455 in_data.data = discard_const_p(char, gss_cksum);
458 /* MIT krb5 < 1.7 is missing the prototype, but still has the symbol */
459 #if !HAVE_DECL_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE
460 krb5_error_code krb5_auth_con_set_req_cksumtype(
461 krb5_context context,
462 krb5_auth_context auth_context,
463 krb5_cksumtype cksumtype);
465 ret = krb5_auth_con_set_req_cksumtype(context, auth_context, 0x8003);
467 syslog(LOG_DEBUG, "%s: unable to set 0x8003 checksum",
473 apreq_pkt.length = 0;
474 apreq_pkt.data = NULL;
475 ret = krb5_mk_req_extended(context, &auth_context, AP_OPTS_USE_SUBKEY,
476 &in_data, out_creds, &apreq_pkt);
478 syslog(LOG_DEBUG, "%s: unable to make AP-REQ for %s",
483 ret = krb5_auth_con_getsendsubkey(context, auth_context, &tokb);
485 syslog(LOG_DEBUG, "%s: unable to get session key for %s",
490 *mechtoken = data_blob(apreq_pkt.data, apreq_pkt.length);
491 *sess_key = data_blob(KRB5_KEY_DATA(tokb), KRB5_KEY_LENGTH(tokb));
493 krb5_free_keyblock(context, tokb);
495 krb5_auth_con_free(context, auth_context);
497 krb5_free_creds(context, out_creds);
499 krb5_free_principal(context, in_creds.client);
501 #if defined(KRB5_TC_OPENCLOSE)
502 krb5_cc_set_flags(context, ccache, KRB5_TC_OPENCLOSE);
504 krb5_cc_close(context, ccache);
506 krb5_free_context(context);
511 * Prepares AP-REQ data for mechToken and gets session key
512 * Uses credentials from cache. It will not ask for password
513 * you should receive credentials for yuor name manually using
514 * kinit or whatever you wish.
517 * oid - string with OID/ Could be OID_KERBEROS5
518 * or OID_KERBEROS5_OLD
519 * principal - Service name.
520 * Could be "cifs/FQDN" for KRB5 OID
521 * or for MS_KRB5 OID style server principal
522 * like "pdc$@YOUR.REALM.NAME"
525 * secblob - pointer for spnego wrapped AP-REQ data to be stored
526 * sess_key- pointer for SessionKey data to be stored
528 * ret: 0 - success, others - failure
531 handle_krb5_mech(const char *oid, const char *host, DATA_BLOB * secblob,
532 DATA_BLOB * sess_key, const char *ccname)
535 DATA_BLOB tkt, tkt_wrapped;
537 syslog(LOG_DEBUG, "%s: getting service ticket for %s", __func__, host);
539 /* get a kerberos ticket for the service and extract the session key */
540 retval = cifs_krb5_get_req(host, ccname, &tkt, sess_key);
542 syslog(LOG_DEBUG, "%s: failed to obtain service ticket (%d)",
547 syslog(LOG_DEBUG, "%s: obtained service ticket", __func__);
549 /* wrap that up in a nice GSS-API wrapping */
550 tkt_wrapped = spnego_gen_krb5_wrap(tkt, TOK_ID_KRB_AP_REQ);
552 /* and wrap that in a shiny SPNEGO wrapper */
553 *secblob = gen_negTokenInit(oid, tkt_wrapped);
555 data_blob_free(&tkt_wrapped);
556 data_blob_free(&tkt);
560 #define DKD_HAVE_HOSTNAME 0x1
561 #define DKD_HAVE_VERSION 0x2
562 #define DKD_HAVE_SEC 0x4
563 #define DKD_HAVE_IP 0x8
564 #define DKD_HAVE_UID 0x10
565 #define DKD_HAVE_PID 0x20
566 #define DKD_HAVE_CREDUID 0x40
567 #define DKD_HAVE_USERNAME 0x80
568 #define DKD_MUSTHAVE_SET (DKD_HAVE_HOSTNAME|DKD_HAVE_VERSION|DKD_HAVE_SEC)
570 struct decoded_args {
582 decode_key_description(const char *desc, struct decoded_args *arg)
587 const char *tkn = desc;
590 pos = index(tkn, ';');
591 if (strncmp(tkn, "host=", 5) == 0) {
599 SAFE_FREE(arg->hostname);
600 arg->hostname = strndup(tkn + 5, len);
601 if (arg->hostname == NULL) {
602 syslog(LOG_ERR, "Unable to allocate memory");
605 retval |= DKD_HAVE_HOSTNAME;
606 syslog(LOG_DEBUG, "host=%s", arg->hostname);
607 } else if (!strncmp(tkn, "ip4=", 4) || !strncmp(tkn, "ip6=", 4)) {
615 arg->ip = strndup(tkn + 4, len);
616 if (arg->ip == NULL) {
617 syslog(LOG_ERR, "Unable to allocate memory");
620 retval |= DKD_HAVE_IP;
621 syslog(LOG_DEBUG, "ip=%s", arg->ip);
622 } else if (strncmp(tkn, "user=", 5) == 0) {
629 SAFE_FREE(arg->username);
630 arg->username = strndup(tkn + 5, len);
631 if (arg->username == NULL) {
632 syslog(LOG_ERR, "Unable to allocate memory");
635 retval |= DKD_HAVE_USERNAME;
636 syslog(LOG_DEBUG, "user=%s", arg->username);
637 } else if (strncmp(tkn, "pid=", 4) == 0) {
639 arg->pid = strtol(tkn + 4, NULL, 0);
641 syslog(LOG_ERR, "Invalid pid format: %s",
645 syslog(LOG_DEBUG, "pid=%u", arg->pid);
646 retval |= DKD_HAVE_PID;
647 } else if (strncmp(tkn, "sec=", 4) == 0) {
648 if (strncmp(tkn + 4, "krb5", 4) == 0) {
649 retval |= DKD_HAVE_SEC;
651 } else if (strncmp(tkn + 4, "mskrb5", 6) == 0) {
652 retval |= DKD_HAVE_SEC;
655 syslog(LOG_DEBUG, "sec=%d", arg->sec);
656 } else if (strncmp(tkn, "uid=", 4) == 0) {
658 arg->uid = strtol(tkn + 4, NULL, 16);
660 syslog(LOG_ERR, "Invalid uid format: %s",
664 retval |= DKD_HAVE_UID;
665 syslog(LOG_DEBUG, "uid=%u", arg->uid);
666 } else if (strncmp(tkn, "creduid=", 8) == 0) {
668 arg->creduid = strtol(tkn + 8, NULL, 16);
670 syslog(LOG_ERR, "Invalid creduid format: %s",
674 retval |= DKD_HAVE_CREDUID;
675 syslog(LOG_DEBUG, "creduid=%u", arg->creduid);
676 } else if (strncmp(tkn, "ver=", 4) == 0) { /* if version */
678 arg->ver = strtol(tkn + 4, NULL, 16);
680 syslog(LOG_ERR, "Invalid version format: %s",
684 retval |= DKD_HAVE_VERSION;
685 syslog(LOG_DEBUG, "ver=%d", arg->ver);
694 static int cifs_resolver(const key_serial_t key, const char *key_descr)
697 struct addrinfo *addr;
698 char ip[INET6_ADDRSTRLEN];
700 const char *keyend = key_descr;
701 /* skip next 4 ';' delimiters to get to description */
702 for (c = 1; c <= 4; c++) {
703 keyend = index(keyend + 1, ';');
705 syslog(LOG_ERR, "invalid key description: %s",
712 /* resolve name to ip */
713 c = getaddrinfo(keyend, NULL, NULL, &addr);
715 syslog(LOG_ERR, "unable to resolve hostname: %s [%s]",
716 keyend, gai_strerror(c));
720 /* conver ip to string form */
721 if (addr->ai_family == AF_INET)
722 p = &(((struct sockaddr_in *)addr->ai_addr)->sin_addr);
724 p = &(((struct sockaddr_in6 *)addr->ai_addr)->sin6_addr);
726 if (!inet_ntop(addr->ai_family, p, ip, sizeof(ip))) {
727 syslog(LOG_ERR, "%s: inet_ntop: %s", __func__, strerror(errno));
733 c = keyctl_instantiate(key, ip, strlen(ip) + 1, 0);
735 syslog(LOG_ERR, "%s: keyctl_instantiate: %s", __func__,
746 * Older kernels sent IPv6 addresses without colons. Well, at least
747 * they're fixed-length strings. Convert these addresses to have colon
748 * delimiters to make getaddrinfo happy.
750 static void convert_inet6_addr(const char *from, char *to)
756 if (!(i++ % 4) && *from)
762 static int ip_to_fqdn(const char *addrstr, char *host, size_t hostlen)
765 struct addrinfo hints = {.ai_flags = AI_NUMERICHOST };
766 struct addrinfo *res;
767 const char *ipaddr = addrstr;
768 char converted[INET6_ADDRSTRLEN + 1];
770 if ((strlen(ipaddr) > INET_ADDRSTRLEN) && !strchr(ipaddr, ':')) {
771 convert_inet6_addr(ipaddr, converted);
775 rc = getaddrinfo(ipaddr, NULL, &hints, &res);
777 syslog(LOG_DEBUG, "%s: failed to resolve %s to "
778 "ipaddr: %s", __func__, ipaddr,
779 rc == EAI_SYSTEM ? strerror(errno) : gai_strerror(rc));
783 rc = getnameinfo(res->ai_addr, res->ai_addrlen, host, hostlen,
784 NULL, 0, NI_NAMEREQD);
787 syslog(LOG_DEBUG, "%s: failed to resolve %s to fqdn: %s",
789 rc == EAI_SYSTEM ? strerror(errno) : gai_strerror(rc));
793 syslog(LOG_DEBUG, "%s: resolved %s to %s", __func__, ipaddr, host);
797 /* walk a string and lowercase it in-place */
799 lowercase_string(char *c)
807 static void usage(void)
809 fprintf(stderr, "Usage: %s [-k /path/to/krb5.conf] [-t] [-v] [-l] key_serial\n", prog);
812 const struct option long_options[] = {
813 {"krb5conf", 1, NULL, 'k'},
814 {"legacy-uid", 0, NULL, 'l'},
815 {"trust-dns", 0, NULL, 't'},
816 {"version", 0, NULL, 'v'},
820 int main(const int argc, char *const argv[])
822 struct cifs_spnego_msg *keydata = NULL;
823 DATA_BLOB secblob = data_blob_null;
824 DATA_BLOB sess_key = data_blob_null;
825 key_serial_t key = 0;
829 int c, try_dns = 0, legacy_uid = 0;
830 char *buf, *ccdir = NULL, *ccname = NULL, *best_cache = NULL;
831 char hostbuf[NI_MAXHOST], *host;
832 struct decoded_args arg;
835 char *keytab_name = CIFS_DEFAULT_KRB5_KEYTAB;
836 time_t best_time = 0;
839 memset(&arg, 0, sizeof(arg));
841 openlog(prog, 0, LOG_DAEMON);
843 while ((c = getopt_long(argc, argv, "ck:ltv", long_options, NULL)) != -1) {
846 /* legacy option -- skip it */
852 if (setenv("KRB5_CONFIG", optarg, 1) != 0) {
853 syslog(LOG_ERR, "unable to set $KRB5_CONFIG: %d", errno);
861 printf("version: %s\n", VERSION);
864 syslog(LOG_ERR, "unknown option: %c", c);
869 /* is there a key? */
870 if (argc <= optind) {
875 /* get key and keyring values */
877 key = strtol(argv[optind], NULL, 10);
880 syslog(LOG_ERR, "Invalid key format: %s", strerror(errno));
884 rc = keyctl_describe_alloc(key, &buf);
886 syslog(LOG_ERR, "keyctl_describe_alloc failed: %s",
892 syslog(LOG_DEBUG, "key description: %s", buf);
894 if ((strncmp(buf, "cifs.resolver", sizeof("cifs.resolver") - 1) == 0) ||
895 (strncmp(buf, "dns_resolver", sizeof("dns_resolver") - 1) == 0)) {
896 rc = cifs_resolver(key, buf);
900 have = decode_key_description(buf, &arg);
902 if ((have & DKD_MUSTHAVE_SET) != DKD_MUSTHAVE_SET) {
903 syslog(LOG_ERR, "unable to get necessary params from key "
904 "description (0x%x)", have);
909 if (arg.ver > CIFS_SPNEGO_UPCALL_VERSION) {
910 syslog(LOG_ERR, "incompatible kernel upcall version: 0x%x",
916 if (strlen(arg.hostname) >= NI_MAXHOST) {
917 syslog(LOG_ERR, "hostname provided by kernel is too long");
923 if (!legacy_uid && (have & DKD_HAVE_CREDUID))
925 else if (have & DKD_HAVE_UID)
928 /* no uid= or creduid= parm -- something is wrong */
929 syslog(LOG_ERR, "No uid= or creduid= parm specified");
936 syslog(LOG_ERR, "setuid: %s", strerror(errno));
939 ccdir = resolve_krb5_dir(CIFS_DEFAULT_KRB5_USER_DIR, uid);
941 find_krb5_cc(ccdir, uid, &best_cache, &best_time);
942 ccname = find_krb5_cc(CIFS_DEFAULT_KRB5_DIR, uid, &best_cache,
946 /* Couldn't find credcache? Try to use keytab */
947 if (ccname == NULL && arg.username != NULL)
948 ccname = init_cc_from_keytab(keytab_name, arg.username);
952 // do mech specific authorization
957 * Andrew Bartlett's suggested scheme for picking a principal
958 * name, based on a supplied hostname.
963 * cifs/fooo.<guessed domain ?>@REALM
965 * INPUT: bar.example.com
967 * cifs/bar.example.com@REALM
969 if (arg.sec == MS_KRB5)
970 oid = OID_KERBEROS5_OLD;
975 lowercase_string(host);
976 rc = handle_krb5_mech(oid, host, &secblob, &sess_key, ccname);
981 * If hostname has a '.', assume it's a FQDN, otherwise we
982 * want to guess the domainname.
984 if (!strchr(host, '.')) {
985 struct addrinfo hints;
988 char fqdn[NI_MAXHOST];
991 * use getaddrinfo() to resolve the hostname of the
992 * server and set ai_canonname.
994 memset(&hints, 0, sizeof(hints));
995 hints.ai_family = AF_UNSPEC;
996 hints.ai_flags = AI_CANONNAME;
997 rc = getaddrinfo(host, NULL, &hints, &ai);
999 syslog(LOG_ERR, "Unable to resolve host address: %s [%s]",
1000 host, gai_strerror(rc));
1004 /* scan forward to first '.' in ai_canonnname */
1005 domainname = strchr(ai->ai_canonname, '.');
1011 lowercase_string(domainname);
1012 rc = snprintf(fqdn, sizeof(fqdn), "%s%s",
1015 if (rc < 0 || (size_t)rc >= sizeof(fqdn)) {
1016 syslog(LOG_ERR, "Problem setting hostname in string: %ld", rc);
1021 rc = handle_krb5_mech(oid, fqdn, &secblob, &sess_key, ccname);
1026 if (!try_dns || !(have & DKD_HAVE_IP))
1029 rc = ip_to_fqdn(arg.ip, hostbuf, sizeof(hostbuf));
1035 goto retry_new_hostname;
1037 syslog(LOG_ERR, "sectype: %d is not implemented", arg.sec);
1043 syslog(LOG_DEBUG, "Unable to obtain service ticket");
1047 /* pack SecurityBlob and SessionKey into downcall packet */
1049 sizeof(struct cifs_spnego_msg) + secblob.length + sess_key.length;
1050 keydata = (struct cifs_spnego_msg *)calloc(sizeof(char), datalen);
1055 keydata->version = arg.ver;
1057 keydata->sesskey_len = sess_key.length;
1058 keydata->secblob_len = secblob.length;
1059 memcpy(&(keydata->data), sess_key.data, sess_key.length);
1060 memcpy(&(keydata->data) + keydata->sesskey_len,
1061 secblob.data, secblob.length);
1064 rc = keyctl_instantiate(key, keydata, datalen, 0);
1066 syslog(LOG_ERR, "keyctl_instantiate: %s", strerror(errno));
1070 /* BB: maybe we need use timeout for key: for example no more then
1071 * ticket lifietime? */
1072 /* keyctl_set_timeout( key, 60); */
1075 * on error, negatively instantiate the key ourselves so that we can
1076 * make sure the kernel doesn't hang it off of a searchable keyring
1077 * and interfere with the next attempt to instantiate the key.
1079 if (rc != 0 && key == 0) {
1080 syslog(LOG_DEBUG, "Negating key");
1081 keyctl_negate(key, 1, KEY_REQKEY_DEFL_DEFAULT);
1083 data_blob_free(&secblob);
1084 data_blob_free(&sess_key);
1086 SAFE_FREE(arg.hostname);
1088 SAFE_FREE(arg.username);
1090 syslog(LOG_DEBUG, "Exit status %ld", rc);