2 * Copyright (c) 1997 - 2005 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
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7 * modification, are permitted provided that the following conditions
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11 * notice, this list of conditions and the following disclaimer.
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14 * notice, this list of conditions and the following disclaimer in the
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18 * may be used to endorse or promote products derived from this software
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34 #include "krb5_locl.h"
37 RCSID("$Id: context.c 23420 2008-07-26 18:37:48Z lha $");
39 #define INIT_FIELD(C, T, E, D, F) \
40 (C)->E = krb5_config_get_ ## T ## _default ((C), NULL, (D), \
41 "libdefaults", F, NULL)
43 #define INIT_FLAG(C, O, V, D, F) \
45 if (krb5_config_get_bool_default((C), NULL, (D),"libdefaults", F, NULL)) { \
51 * Set the list of etypes `ret_etypes' from the configuration variable
55 static krb5_error_code
56 set_etypes (krb5_context context,
58 krb5_enctype **ret_enctypes)
61 krb5_enctype *etypes = NULL;
63 etypes_str = krb5_config_get_strings(context, NULL, "libdefaults",
67 for(i = 0; etypes_str[i]; i++);
68 etypes = malloc((i+1) * sizeof(*etypes));
70 krb5_config_free_strings (etypes_str);
71 krb5_set_error_message (context, ENOMEM, "malloc: out of memory");
74 for(j = 0, k = 0; j < i; j++) {
76 if(krb5_string_to_enctype(context, etypes_str[j], &e) != 0)
78 if (krb5_enctype_valid(context, e) != 0)
82 etypes[k] = ETYPE_NULL;
83 krb5_config_free_strings(etypes_str);
85 *ret_enctypes = etypes;
90 * read variables from the configuration file and set in `context'
93 static krb5_error_code
94 init_context_from_config_file(krb5_context context)
98 krb5_enctype *tmptypes;
100 INIT_FIELD(context, time, max_skew, 5 * 60, "clockskew");
101 INIT_FIELD(context, time, kdc_timeout, 3, "kdc_timeout");
102 INIT_FIELD(context, int, max_retries, 3, "max_retries");
104 INIT_FIELD(context, string, http_proxy, NULL, "http_proxy");
106 ret = set_etypes (context, "default_etypes", &tmptypes);
109 free(context->etypes);
110 context->etypes = tmptypes;
112 ret = set_etypes (context, "default_etypes_des", &tmptypes);
115 free(context->etypes_des);
116 context->etypes_des = tmptypes;
118 /* default keytab name */
121 tmp = getenv("KRB5_KTNAME");
123 context->default_keytab = tmp;
125 INIT_FIELD(context, string, default_keytab,
126 KEYTAB_DEFAULT, "default_keytab_name");
128 INIT_FIELD(context, string, default_keytab_modify,
129 NULL, "default_keytab_modify_name");
131 INIT_FIELD(context, string, time_fmt,
132 "%Y-%m-%dT%H:%M:%S", "time_format");
134 INIT_FIELD(context, string, date_fmt,
135 "%Y-%m-%d", "date_format");
137 INIT_FIELD(context, bool, log_utc,
142 /* init dns-proxy slime */
143 tmp = krb5_config_get_string(context, NULL, "libdefaults",
146 roken_gethostby_setup(context->http_proxy, tmp);
147 krb5_free_host_realm (context, context->default_realms);
148 context->default_realms = NULL;
151 krb5_addresses addresses;
154 krb5_set_extra_addresses(context, NULL);
155 adr = krb5_config_get_strings(context, NULL,
159 memset(&addresses, 0, sizeof(addresses));
160 for(a = adr; a && *a; a++) {
161 ret = krb5_parse_address(context, *a, &addresses);
163 krb5_add_extra_addresses(context, &addresses);
164 krb5_free_addresses(context, &addresses);
167 krb5_config_free_strings(adr);
169 krb5_set_ignore_addresses(context, NULL);
170 adr = krb5_config_get_strings(context, NULL,
174 memset(&addresses, 0, sizeof(addresses));
175 for(a = adr; a && *a; a++) {
176 ret = krb5_parse_address(context, *a, &addresses);
178 krb5_add_ignore_addresses(context, &addresses);
179 krb5_free_addresses(context, &addresses);
182 krb5_config_free_strings(adr);
185 INIT_FIELD(context, bool, scan_interfaces, TRUE, "scan_interfaces");
186 INIT_FIELD(context, int, fcache_vno, 0, "fcache_version");
187 /* prefer dns_lookup_kdc over srv_lookup. */
188 INIT_FIELD(context, bool, srv_lookup, TRUE, "srv_lookup");
189 INIT_FIELD(context, bool, srv_lookup, context->srv_lookup, "dns_lookup_kdc");
190 INIT_FIELD(context, int, large_msg_size, 1400, "large_message_size");
191 INIT_FLAG(context, flags, KRB5_CTX_F_DNS_CANONICALIZE_HOSTNAME, TRUE, "dns_canonicalize_hostname");
192 INIT_FLAG(context, flags, KRB5_CTX_F_CHECK_PAC, TRUE, "check_pac");
193 context->default_cc_name = NULL;
194 context->default_cc_name_set = 0;
199 * Initializes the context structure and reads the configuration file
200 * /etc/krb5.conf. The structure should be freed by calling
201 * krb5_free_context() when it is no longer being used.
203 * @param context pointer to returned context
205 * @return Returns 0 to indicate success. Otherwise an errno code is
206 * returned. Failure means either that something bad happened during
207 * initialization (typically ENOMEM) or that Kerberos should not be
213 krb5_error_code KRB5_LIB_FUNCTION
214 krb5_init_context(krb5_context *context)
222 p = calloc(1, sizeof(*p));
226 p->mutex = malloc(sizeof(HEIMDAL_MUTEX));
227 if (p->mutex == NULL) {
231 HEIMDAL_MUTEX_init(p->mutex);
233 ret = krb5_get_default_config_files(&files);
236 ret = krb5_set_config_files(p, files);
237 krb5_free_config_files(files);
241 /* init error tables */
246 krb5_cc_register(p, &krb5_acc_ops, TRUE);
247 krb5_cc_register(p, &krb5_fcc_ops, TRUE);
248 krb5_cc_register(p, &krb5_mcc_ops, TRUE);
249 krb5_cc_register(p, &krb5_scc_ops, TRUE);
251 krb5_cc_register(p, &krb5_kcm_ops, TRUE);
256 krb5_kt_register (p, &krb5_fkt_ops);
257 krb5_kt_register (p, &krb5_wrfkt_ops);
258 krb5_kt_register (p, &krb5_javakt_ops);
259 krb5_kt_register (p, &krb5_mkt_ops);
260 krb5_kt_register (p, &krb5_akf_ops);
261 krb5_kt_register (p, &krb5_any_ops);
265 krb5_free_context(p);
273 * Frees the krb5_context allocated by krb5_init_context().
275 * @param context context to be freed.
280 void KRB5_LIB_FUNCTION
281 krb5_free_context(krb5_context context)
283 if (context->default_cc_name)
284 free(context->default_cc_name);
285 if (context->default_cc_name_env)
286 free(context->default_cc_name_env);
287 free(context->etypes);
288 free(context->etypes_des);
289 krb5_free_host_realm (context, context->default_realms);
290 krb5_config_file_free (context, context->cf);
291 free_error_table (context->et_list);
292 free(context->cc_ops);
293 free(context->kt_types);
294 krb5_clear_error_string(context);
295 if(context->warn_dest != NULL)
296 krb5_closelog(context, context->warn_dest);
297 krb5_set_extra_addresses(context, NULL);
298 krb5_set_ignore_addresses(context, NULL);
299 krb5_set_send_to_kdc_func(context, NULL, NULL);
300 if (context->mutex != NULL) {
301 HEIMDAL_MUTEX_destroy(context->mutex);
302 free(context->mutex);
304 memset(context, 0, sizeof(*context));
309 * Reinit the context from a new set of filenames.
311 * @param context context to add configuration too.
312 * @param filenames array of filenames, end of list is indicated with a NULL filename.
314 * @return Returns 0 to indicate success. Otherwise an kerberos et
315 * error code is returned, see krb5_get_error_message().
320 krb5_error_code KRB5_LIB_FUNCTION
321 krb5_set_config_files(krb5_context context, char **filenames)
324 krb5_config_binding *tmp = NULL;
325 while(filenames != NULL && *filenames != NULL && **filenames != '\0') {
326 ret = krb5_config_parse_file_multi(context, *filenames, &tmp);
327 if(ret != 0 && ret != ENOENT && ret != EACCES) {
328 krb5_config_file_free(context, tmp);
334 /* with this enabled and if there are no config files, Kerberos is
335 considererd disabled */
339 krb5_config_file_free(context, context->cf);
341 ret = init_context_from_config_file(context);
345 static krb5_error_code
346 add_file(char ***pfilenames, int *len, char *file)
348 char **pp = *pfilenames;
351 for(i = 0; i < *len; i++) {
352 if(strcmp(pp[i], file) == 0) {
358 pp = realloc(*pfilenames, (*len + 2) * sizeof(*pp));
372 * `pq' isn't free, it's up the the caller
375 krb5_error_code KRB5_LIB_FUNCTION
376 krb5_prepend_config_files(const char *filelist, char **pq, char ***ret_pp)
391 l = strsep_copy(&q, ":", NULL, 0);
396 krb5_free_config_files(pp);
399 l = strsep_copy(&p, ":", fn, l + 1);
400 ret = add_file(&pp, &len, fn);
402 krb5_free_config_files(pp);
410 for (i = 0; pq[i] != NULL; i++) {
413 krb5_free_config_files(pp);
416 ret = add_file(&pp, &len, fn);
418 krb5_free_config_files(pp);
429 * Prepend the filename to the global configuration list.
431 * @param filelist a filename to add to the default list of filename
432 * @param pfilenames return array of filenames, should be freed with krb5_free_config_files().
434 * @return Returns 0 to indicate success. Otherwise an kerberos et
435 * error code is returned, see krb5_get_error_message().
440 krb5_error_code KRB5_LIB_FUNCTION
441 krb5_prepend_config_files_default(const char *filelist, char ***pfilenames)
444 char **defpp, **pp = NULL;
446 ret = krb5_get_default_config_files(&defpp);
450 ret = krb5_prepend_config_files(filelist, defpp, &pp);
451 krb5_free_config_files(defpp);
460 * Get the global configuration list.
462 * @param pfilenames return array of filenames, should be freed with krb5_free_config_files().
464 * @return Returns 0 to indicate success. Otherwise an kerberos et
465 * error code is returned, see krb5_get_error_message().
470 krb5_error_code KRB5_LIB_FUNCTION
471 krb5_get_default_config_files(char ***pfilenames)
473 const char *files = NULL;
475 if (pfilenames == NULL)
478 files = getenv("KRB5_CONFIG");
480 files = krb5_config_file;
482 return krb5_prepend_config_files(files, NULL, pfilenames);
486 * Free a list of configuration files.
488 * @param filenames list to be freed.
490 * @return Returns 0 to indicate success. Otherwise an kerberos et
491 * error code is returned, see krb5_get_error_message().
496 void KRB5_LIB_FUNCTION
497 krb5_free_config_files(char **filenames)
500 for(p = filenames; *p != NULL; p++)
506 * Returns the list of Kerberos encryption types sorted in order of
507 * most preferred to least preferred encryption type. Note that some
508 * encryption types might be disabled, so you need to check with
509 * krb5_enctype_valid() before using the encryption type.
511 * @return list of enctypes, terminated with ETYPE_NULL. Its a static
512 * array completed into the Kerberos library so the content doesn't
518 const krb5_enctype * KRB5_LIB_FUNCTION
519 krb5_kerberos_enctypes(krb5_context context)
521 static const krb5_enctype p[] = {
522 ETYPE_AES256_CTS_HMAC_SHA1_96,
523 ETYPE_AES128_CTS_HMAC_SHA1_96,
526 ETYPE_ARCFOUR_HMAC_MD5,
536 * set `etype' to a malloced list of the default enctypes
539 static krb5_error_code
540 default_etypes(krb5_context context, krb5_enctype **etype)
542 const krb5_enctype *p;
543 krb5_enctype *e = NULL, *ep;
546 p = krb5_kerberos_enctypes(context);
548 for (i = 0; p[i] != ETYPE_NULL; i++) {
549 if (krb5_enctype_valid(context, p[i]) != 0)
551 ep = realloc(e, (n + 2) * sizeof(*e));
554 krb5_set_error_message (context, ENOMEM, "malloc: out of memory");
559 e[n + 1] = ETYPE_NULL;
567 * Set the default encryption types that will be use in communcation
568 * with the KDC, clients and servers.
570 * @param context Kerberos 5 context.
571 * @param etypes Encryption types, array terminated with ETYPE_NULL (0).
573 * @return Returns 0 to indicate success. Otherwise an kerberos et
574 * error code is returned, see krb5_get_error_message().
579 krb5_error_code KRB5_LIB_FUNCTION
580 krb5_set_default_in_tkt_etypes(krb5_context context,
581 const krb5_enctype *etypes)
583 krb5_enctype *p = NULL;
587 for (i = 0; etypes[i]; ++i) {
589 ret = krb5_enctype_valid(context, etypes[i]);
596 krb5_set_error_message (context, ENOMEM, "malloc: out of memory");
599 memmove(p, etypes, i * sizeof(krb5_enctype));
602 free(context->etypes);
608 * Get the default encryption types that will be use in communcation
609 * with the KDC, clients and servers.
611 * @param context Kerberos 5 context.
612 * @param etypes Encryption types, array terminated with
613 * ETYPE_NULL(0), caller should free array with krb5_xfree():
615 * @return Returns 0 to indicate success. Otherwise an kerberos et
616 * error code is returned, see krb5_get_error_message().
621 krb5_error_code KRB5_LIB_FUNCTION
622 krb5_get_default_in_tkt_etypes(krb5_context context,
623 krb5_enctype **etypes)
629 if(context->etypes) {
630 for(i = 0; context->etypes[i]; i++);
634 krb5_set_error_message (context, ENOMEM, "malloc: out of memory");
637 memmove(p, context->etypes, i * sizeof(krb5_enctype));
639 ret = default_etypes(context, &p);
648 * Return the error string for the error code. The caller must not
651 * @param context Kerberos 5 context.
652 * @param code Kerberos error code.
654 * @return the error message matching code
659 const char* KRB5_LIB_FUNCTION
660 krb5_get_err_text(krb5_context context, krb5_error_code code)
662 const char *p = NULL;
664 p = com_right(context->et_list, code);
673 * Init the built-in ets in the Kerberos library.
675 * @param context kerberos context to add the ets too
680 void KRB5_LIB_FUNCTION
681 krb5_init_ets(krb5_context context)
683 if(context->et_list == NULL){
684 krb5_add_et_list(context, initialize_krb5_error_table_r);
685 krb5_add_et_list(context, initialize_asn1_error_table_r);
686 krb5_add_et_list(context, initialize_heim_error_table_r);
687 krb5_add_et_list(context, initialize_k524_error_table_r);
689 krb5_add_et_list(context, initialize_hx_error_table_r);
695 * Make the kerberos library default to the admin KDC.
697 * @param context Kerberos 5 context.
698 * @param flag boolean flag to select if the use the admin KDC or not.
703 void KRB5_LIB_FUNCTION
704 krb5_set_use_admin_kdc (krb5_context context, krb5_boolean flag)
706 context->use_admin_kdc = flag;
710 * Make the kerberos library default to the admin KDC.
712 * @param context Kerberos 5 context.
714 * @return boolean flag to telling the context will use admin KDC as the default KDC.
719 krb5_boolean KRB5_LIB_FUNCTION
720 krb5_get_use_admin_kdc (krb5_context context)
722 return context->use_admin_kdc;
726 * Add extra address to the address list that the library will add to
727 * the client's address list when communicating with the KDC.
729 * @param context Kerberos 5 context.
730 * @param addresses addreses to add
732 * @return Returns 0 to indicate success. Otherwise an kerberos et
733 * error code is returned, see krb5_get_error_message().
738 krb5_error_code KRB5_LIB_FUNCTION
739 krb5_add_extra_addresses(krb5_context context, krb5_addresses *addresses)
742 if(context->extra_addresses)
743 return krb5_append_addresses(context,
744 context->extra_addresses, addresses);
746 return krb5_set_extra_addresses(context, addresses);
750 * Set extra address to the address list that the library will add to
751 * the client's address list when communicating with the KDC.
753 * @param context Kerberos 5 context.
754 * @param addresses addreses to set
756 * @return Returns 0 to indicate success. Otherwise an kerberos et
757 * error code is returned, see krb5_get_error_message().
762 krb5_error_code KRB5_LIB_FUNCTION
763 krb5_set_extra_addresses(krb5_context context, const krb5_addresses *addresses)
765 if(context->extra_addresses)
766 krb5_free_addresses(context, context->extra_addresses);
768 if(addresses == NULL) {
769 if(context->extra_addresses != NULL) {
770 free(context->extra_addresses);
771 context->extra_addresses = NULL;
775 if(context->extra_addresses == NULL) {
776 context->extra_addresses = malloc(sizeof(*context->extra_addresses));
777 if(context->extra_addresses == NULL) {
778 krb5_set_error_message (context, ENOMEM, "malloc: out of memory");
782 return krb5_copy_addresses(context, addresses, context->extra_addresses);
786 * Get extra address to the address list that the library will add to
787 * the client's address list when communicating with the KDC.
789 * @param context Kerberos 5 context.
790 * @param addresses addreses to set
792 * @return Returns 0 to indicate success. Otherwise an kerberos et
793 * error code is returned, see krb5_get_error_message().
798 krb5_error_code KRB5_LIB_FUNCTION
799 krb5_get_extra_addresses(krb5_context context, krb5_addresses *addresses)
801 if(context->extra_addresses == NULL) {
802 memset(addresses, 0, sizeof(*addresses));
805 return krb5_copy_addresses(context,context->extra_addresses, addresses);
809 * Add extra addresses to ignore when fetching addresses from the
810 * underlaying operating system.
812 * @param context Kerberos 5 context.
813 * @param addresses addreses to ignore
815 * @return Returns 0 to indicate success. Otherwise an kerberos et
816 * error code is returned, see krb5_get_error_message().
821 krb5_error_code KRB5_LIB_FUNCTION
822 krb5_add_ignore_addresses(krb5_context context, krb5_addresses *addresses)
825 if(context->ignore_addresses)
826 return krb5_append_addresses(context,
827 context->ignore_addresses, addresses);
829 return krb5_set_ignore_addresses(context, addresses);
833 * Set extra addresses to ignore when fetching addresses from the
834 * underlaying operating system.
836 * @param context Kerberos 5 context.
837 * @param addresses addreses to ignore
839 * @return Returns 0 to indicate success. Otherwise an kerberos et
840 * error code is returned, see krb5_get_error_message().
845 krb5_error_code KRB5_LIB_FUNCTION
846 krb5_set_ignore_addresses(krb5_context context, const krb5_addresses *addresses)
848 if(context->ignore_addresses)
849 krb5_free_addresses(context, context->ignore_addresses);
850 if(addresses == NULL) {
851 if(context->ignore_addresses != NULL) {
852 free(context->ignore_addresses);
853 context->ignore_addresses = NULL;
857 if(context->ignore_addresses == NULL) {
858 context->ignore_addresses = malloc(sizeof(*context->ignore_addresses));
859 if(context->ignore_addresses == NULL) {
860 krb5_set_error_message (context, ENOMEM, "malloc: out of memory");
864 return krb5_copy_addresses(context, addresses, context->ignore_addresses);
868 * Get extra addresses to ignore when fetching addresses from the
869 * underlaying operating system.
871 * @param context Kerberos 5 context.
872 * @param addresses list addreses ignored
874 * @return Returns 0 to indicate success. Otherwise an kerberos et
875 * error code is returned, see krb5_get_error_message().
880 krb5_error_code KRB5_LIB_FUNCTION
881 krb5_get_ignore_addresses(krb5_context context, krb5_addresses *addresses)
883 if(context->ignore_addresses == NULL) {
884 memset(addresses, 0, sizeof(*addresses));
887 return krb5_copy_addresses(context, context->ignore_addresses, addresses);
891 * Set version of fcache that the library should use.
893 * @param context Kerberos 5 context.
894 * @param version version number.
896 * @return Returns 0 to indicate success. Otherwise an kerberos et
897 * error code is returned, see krb5_get_error_message().
902 krb5_error_code KRB5_LIB_FUNCTION
903 krb5_set_fcache_version(krb5_context context, int version)
905 context->fcache_vno = version;
910 * Get version of fcache that the library should use.
912 * @param context Kerberos 5 context.
913 * @param version version number.
915 * @return Returns 0 to indicate success. Otherwise an kerberos et
916 * error code is returned, see krb5_get_error_message().
921 krb5_error_code KRB5_LIB_FUNCTION
922 krb5_get_fcache_version(krb5_context context, int *version)
924 *version = context->fcache_vno;
929 * Runtime check if the Kerberos library was complied with thread support.
931 * @return TRUE if the library was compiled with thread support, FALSE if not.
937 krb5_boolean KRB5_LIB_FUNCTION
938 krb5_is_thread_safe(void)
940 #ifdef ENABLE_PTHREAD_SUPPORT
948 * Set if the library should use DNS to canonicalize hostnames.
950 * @param context Kerberos 5 context.
951 * @param flag if its dns canonicalizion is used or not.
956 void KRB5_LIB_FUNCTION
957 krb5_set_dns_canonicalize_hostname (krb5_context context, krb5_boolean flag)
960 context->flags |= KRB5_CTX_F_DNS_CANONICALIZE_HOSTNAME;
962 context->flags &= ~KRB5_CTX_F_DNS_CANONICALIZE_HOSTNAME;
966 * Get if the library uses DNS to canonicalize hostnames.
968 * @param context Kerberos 5 context.
970 * @return return non zero if the library uses DNS to canonicalize hostnames.
975 krb5_boolean KRB5_LIB_FUNCTION
976 krb5_get_dns_canonicalize_hostname (krb5_context context)
978 return (context->flags & KRB5_CTX_F_DNS_CANONICALIZE_HOSTNAME) ? 1 : 0;
982 * Get current offset in time to the KDC.
984 * @param context Kerberos 5 context.
985 * @param sec seconds part of offset.
986 * @param usec micro seconds part of offset.
988 * @return returns zero
993 krb5_error_code KRB5_LIB_FUNCTION
994 krb5_get_kdc_sec_offset (krb5_context context, int32_t *sec, int32_t *usec)
997 *sec = context->kdc_sec_offset;
999 *usec = context->kdc_usec_offset;
1004 * Set current offset in time to the KDC.
1006 * @param context Kerberos 5 context.
1007 * @param sec seconds part of offset.
1008 * @param usec micro seconds part of offset.
1010 * @return returns zero
1015 krb5_error_code KRB5_LIB_FUNCTION
1016 krb5_set_kdc_sec_offset (krb5_context context, int32_t sec, int32_t usec)
1018 context->kdc_sec_offset = sec;
1020 context->kdc_usec_offset = usec;
1025 * Get max time skew allowed.
1027 * @param context Kerberos 5 context.
1029 * @return timeskew in seconds.
1034 time_t KRB5_LIB_FUNCTION
1035 krb5_get_max_time_skew (krb5_context context)
1037 return context->max_skew;
1041 * Set max time skew allowed.
1043 * @param context Kerberos 5 context.
1044 * @param t timeskew in seconds.
1049 void KRB5_LIB_FUNCTION
1050 krb5_set_max_time_skew (krb5_context context, time_t t)
1052 context->max_skew = t;