/* * Copyright (c) 1997 - 2005 Kungliga Tekniska H�gskolan * (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. 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 "krb5_locl.h" #include <com_err.h> RCSID("$Id: context.c 19107 2006-11-24 14:24:33Z lha $"); #define INIT_FIELD(C, T, E, D, F) \ (C)->E = krb5_config_get_ ## T ## _default ((C), NULL, (D), \ "libdefaults", F, NULL) /* * Set the list of etypes `ret_etypes' from the configuration variable * `name' */ static krb5_error_code set_etypes (krb5_context context, const char *name, krb5_enctype **ret_enctypes) { char **etypes_str; krb5_enctype *etypes = NULL; etypes_str = krb5_config_get_strings(context, NULL, "libdefaults", name, NULL); if(etypes_str){ int i, j, k; for(i = 0; etypes_str[i]; i++); etypes = malloc((i+1) * sizeof(*etypes)); if (etypes == NULL) { krb5_config_free_strings (etypes_str); krb5_set_error_string (context, "malloc: out of memory"); return ENOMEM; } for(j = 0, k = 0; j < i; j++) { krb5_enctype e; if(krb5_string_to_enctype(context, etypes_str[j], &e) != 0) continue; if (krb5_enctype_valid(context, e) != 0) continue; etypes[k++] = e; } etypes[k] = ETYPE_NULL; krb5_config_free_strings(etypes_str); } *ret_enctypes = etypes; return 0; } /* * read variables from the configuration file and set in `context' */ static krb5_error_code init_context_from_config_file(krb5_context context) { krb5_error_code ret; const char * tmp; krb5_enctype *tmptypes; INIT_FIELD(context, time, max_skew, 5 * 60, "clockskew"); INIT_FIELD(context, time, kdc_timeout, 3, "kdc_timeout"); INIT_FIELD(context, int, max_retries, 3, "max_retries"); INIT_FIELD(context, string, http_proxy, NULL, "http_proxy"); ret = set_etypes (context, "default_etypes", &tmptypes); if(ret) return ret; free(context->etypes); context->etypes = tmptypes; ret = set_etypes (context, "default_etypes_des", &tmptypes); if(ret) return ret; free(context->etypes_des); context->etypes_des = tmptypes; /* default keytab name */ tmp = NULL; if(!issuid()) tmp = getenv("KRB5_KTNAME"); if(tmp != NULL) context->default_keytab = tmp; else INIT_FIELD(context, string, default_keytab, KEYTAB_DEFAULT, "default_keytab_name"); INIT_FIELD(context, string, default_keytab_modify, NULL, "default_keytab_modify_name"); INIT_FIELD(context, string, time_fmt, "%Y-%m-%dT%H:%M:%S", "time_format"); INIT_FIELD(context, string, date_fmt, "%Y-%m-%d", "date_format"); INIT_FIELD(context, bool, log_utc, FALSE, "log_utc"); /* init dns-proxy slime */ tmp = krb5_config_get_string(context, NULL, "libdefaults", "dns_proxy", NULL); if(tmp) roken_gethostby_setup(context->http_proxy, tmp); krb5_free_host_realm (context, context->default_realms); context->default_realms = NULL; { krb5_addresses addresses; char **adr, **a; krb5_set_extra_addresses(context, NULL); adr = krb5_config_get_strings(context, NULL, "libdefaults", "extra_addresses", NULL); memset(&addresses, 0, sizeof(addresses)); for(a = adr; a && *a; a++) { ret = krb5_parse_address(context, *a, &addresses); if (ret == 0) { krb5_add_extra_addresses(context, &addresses); krb5_free_addresses(context, &addresses); } } krb5_config_free_strings(adr); krb5_set_ignore_addresses(context, NULL); adr = krb5_config_get_strings(context, NULL, "libdefaults", "ignore_addresses", NULL); memset(&addresses, 0, sizeof(addresses)); for(a = adr; a && *a; a++) { ret = krb5_parse_address(context, *a, &addresses); if (ret == 0) { krb5_add_ignore_addresses(context, &addresses); krb5_free_addresses(context, &addresses); } } krb5_config_free_strings(adr); } INIT_FIELD(context, bool, scan_interfaces, TRUE, "scan_interfaces"); INIT_FIELD(context, int, fcache_vno, 0, "fcache_version"); /* prefer dns_lookup_kdc over srv_lookup. */ INIT_FIELD(context, bool, srv_lookup, TRUE, "srv_lookup"); INIT_FIELD(context, bool, srv_lookup, context->srv_lookup, "dns_lookup_kdc"); INIT_FIELD(context, int, large_msg_size, 1400, "large_message_size"); INIT_FIELD(context, bool, dns_canonicalize_hostname, TRUE, "dns_canonicalize_hostname"); context->default_cc_name = NULL; return 0; } krb5_error_code KRB5_LIB_FUNCTION krb5_init_context(krb5_context *context) { krb5_context p; krb5_error_code ret; char **files; *context = NULL; p = calloc(1, sizeof(*p)); if(!p) return ENOMEM; p->mutex = malloc(sizeof(HEIMDAL_MUTEX)); if (p->mutex == NULL) { free(p); return ENOMEM; } HEIMDAL_MUTEX_init(p->mutex); ret = krb5_get_default_config_files(&files); if(ret) goto out; ret = krb5_set_config_files(p, files); krb5_free_config_files(files); if(ret) goto out; /* init error tables */ krb5_init_ets(p); p->cc_ops = NULL; p->num_cc_ops = 0; krb5_cc_register(p, &krb5_acc_ops, TRUE); krb5_cc_register(p, &krb5_fcc_ops, TRUE); krb5_cc_register(p, &krb5_mcc_ops, TRUE); #ifdef HAVE_KCM krb5_cc_register(p, &krb5_kcm_ops, TRUE); #endif p->num_kt_types = 0; p->kt_types = NULL; krb5_kt_register (p, &krb5_fkt_ops); krb5_kt_register (p, &krb5_wrfkt_ops); krb5_kt_register (p, &krb5_javakt_ops); krb5_kt_register (p, &krb5_mkt_ops); krb5_kt_register (p, &krb5_akf_ops); krb5_kt_register (p, &krb4_fkt_ops); krb5_kt_register (p, &krb5_srvtab_fkt_ops); krb5_kt_register (p, &krb5_any_ops); out: if(ret) { krb5_free_context(p); p = NULL; } *context = p; return ret; } void KRB5_LIB_FUNCTION krb5_free_context(krb5_context context) { if (context->default_cc_name) free(context->default_cc_name); free(context->etypes); free(context->etypes_des); krb5_free_host_realm (context, context->default_realms); krb5_config_file_free (context, context->cf); free_error_table (context->et_list); free(context->cc_ops); free(context->kt_types); krb5_clear_error_string(context); if(context->warn_dest != NULL) krb5_closelog(context, context->warn_dest); krb5_set_extra_addresses(context, NULL); krb5_set_ignore_addresses(context, NULL); krb5_set_send_to_kdc_func(context, NULL, NULL); if (context->mutex != NULL) { HEIMDAL_MUTEX_destroy(context->mutex); free(context->mutex); } memset(context, 0, sizeof(*context)); free(context); } krb5_error_code KRB5_LIB_FUNCTION krb5_set_config_files(krb5_context context, char **filenames) { krb5_error_code ret; krb5_config_binding *tmp = NULL; while(filenames != NULL && *filenames != NULL && **filenames != '\0') { ret = krb5_config_parse_file_multi(context, *filenames, &tmp); if(ret != 0 && ret != ENOENT && ret != EACCES) { krb5_config_file_free(context, tmp); return ret; } filenames++; } #if 0 /* with this enabled and if there are no config files, Kerberos is considererd disabled */ if(tmp == NULL) return ENXIO; #endif krb5_config_file_free(context, context->cf); context->cf = tmp; ret = init_context_from_config_file(context); return ret; } static krb5_error_code add_file(char ***pfilenames, int *len, char *file) { char **pp = *pfilenames; int i; for(i = 0; i < *len; i++) { if(strcmp(pp[i], file) == 0) { free(file); return 0; } } pp = realloc(*pfilenames, (*len + 2) * sizeof(*pp)); if (pp == NULL) { free(file); return ENOMEM; } pp[*len] = file; pp[*len + 1] = NULL; *pfilenames = pp; *len += 1; return 0; } /* * `pq' isn't free, its up the the caller */ krb5_error_code KRB5_LIB_FUNCTION krb5_prepend_config_files(const char *filelist, char **pq, char ***ret_pp) { krb5_error_code ret; const char *p, *q; char **pp; int len; char *fn; pp = NULL; len = 0; p = filelist; while(1) { ssize_t l; q = p; l = strsep_copy(&q, ":", NULL, 0); if(l == -1) break; fn = malloc(l + 1); if(fn == NULL) { krb5_free_config_files(pp); return ENOMEM; } l = strsep_copy(&p, ":", fn, l + 1); ret = add_file(&pp, &len, fn); if (ret) { krb5_free_config_files(pp); return ret; } } if (pq != NULL) { int i; for (i = 0; pq[i] != NULL; i++) { fn = strdup(pq[i]); if (fn == NULL) { krb5_free_config_files(pp); return ENOMEM; } ret = add_file(&pp, &len, fn); if (ret) { krb5_free_config_files(pp); return ret; } } } *ret_pp = pp; return 0; } krb5_error_code KRB5_LIB_FUNCTION krb5_prepend_config_files_default(const char *filelist, char ***pfilenames) { krb5_error_code ret; char **defpp, **pp = NULL; ret = krb5_get_default_config_files(&defpp); if (ret) return ret; ret = krb5_prepend_config_files(filelist, defpp, &pp); krb5_free_config_files(defpp); if (ret) { return ret; } *pfilenames = pp; return 0; } krb5_error_code KRB5_LIB_FUNCTION krb5_get_default_config_files(char ***pfilenames) { const char *files = NULL; if (pfilenames == NULL) return EINVAL; if(!issuid()) files = getenv("KRB5_CONFIG"); if (files == NULL) files = krb5_config_file; return krb5_prepend_config_files(files, NULL, pfilenames); } void KRB5_LIB_FUNCTION krb5_free_config_files(char **filenames) { char **p; for(p = filenames; *p != NULL; p++) free(*p); free(filenames); } /* * Returns the list of Kerberos encryption types sorted in order of * most preferred to least preferred encryption type. The array ends * with ETYPE_NULL. Note that some encryption types might be * disabled, so you need to check with krb5_enctype_valid() before * using the encryption type. */ const krb5_enctype * KRB5_LIB_FUNCTION krb5_kerberos_enctypes(krb5_context context) { static const krb5_enctype p[] = { ETYPE_AES256_CTS_HMAC_SHA1_96, ETYPE_AES128_CTS_HMAC_SHA1_96, ETYPE_DES3_CBC_SHA1, ETYPE_DES3_CBC_MD5, ETYPE_ARCFOUR_HMAC_MD5, ETYPE_DES_CBC_MD5, ETYPE_DES_CBC_MD4, ETYPE_DES_CBC_CRC, ETYPE_NULL }; return p; } /* * set `etype' to a malloced list of the default enctypes */ static krb5_error_code default_etypes(krb5_context context, krb5_enctype **etype) { const krb5_enctype *p; krb5_enctype *e = NULL, *ep; int i, n = 0; p = krb5_kerberos_enctypes(context); for (i = 0; p[i] != ETYPE_NULL; i++) { if (krb5_enctype_valid(context, p[i]) != 0) continue; ep = realloc(e, (n + 2) * sizeof(*e)); if (ep == NULL) { free(e); krb5_set_error_string (context, "malloc: out of memory"); return ENOMEM; } e = ep; e[n] = p[i]; e[n + 1] = ETYPE_NULL; n++; } *etype = e; return 0; } krb5_error_code KRB5_LIB_FUNCTION krb5_set_default_in_tkt_etypes(krb5_context context, const krb5_enctype *etypes) { krb5_enctype *p = NULL; int i; if(etypes) { for (i = 0; etypes[i]; ++i) { krb5_error_code ret; ret = krb5_enctype_valid(context, etypes[i]); if (ret) return ret; } ++i; ALLOC(p, i); if(!p) { krb5_set_error_string (context, "malloc: out of memory"); return ENOMEM; } memmove(p, etypes, i * sizeof(krb5_enctype)); } if(context->etypes) free(context->etypes); context->etypes = p; return 0; } krb5_error_code KRB5_LIB_FUNCTION krb5_get_default_in_tkt_etypes(krb5_context context, krb5_enctype **etypes) { krb5_enctype *p; int i; krb5_error_code ret; if(context->etypes) { for(i = 0; context->etypes[i]; i++); ++i; ALLOC(p, i); if(!p) { krb5_set_error_string (context, "malloc: out of memory"); return ENOMEM; } memmove(p, context->etypes, i * sizeof(krb5_enctype)); } else { ret = default_etypes(context, &p); if (ret) return ret; } *etypes = p; return 0; } const char* KRB5_LIB_FUNCTION krb5_get_err_text(krb5_context context, krb5_error_code code) { const char *p = NULL; if(context != NULL) p = com_right(context->et_list, code); if(p == NULL) p = strerror(code); if (p == NULL) p = "Unknown error"; return p; } void KRB5_LIB_FUNCTION krb5_init_ets(krb5_context context) { if(context->et_list == NULL){ krb5_add_et_list(context, initialize_krb5_error_table_r); krb5_add_et_list(context, initialize_asn1_error_table_r); krb5_add_et_list(context, initialize_heim_error_table_r); krb5_add_et_list(context, initialize_k524_error_table_r); #ifdef PKINIT krb5_add_et_list(context, initialize_hx_error_table_r); #endif } } void KRB5_LIB_FUNCTION krb5_set_use_admin_kdc (krb5_context context, krb5_boolean flag) { context->use_admin_kdc = flag; } krb5_boolean KRB5_LIB_FUNCTION krb5_get_use_admin_kdc (krb5_context context) { return context->use_admin_kdc; } krb5_error_code KRB5_LIB_FUNCTION krb5_add_extra_addresses(krb5_context context, krb5_addresses *addresses) { if(context->extra_addresses) return krb5_append_addresses(context, context->extra_addresses, addresses); else return krb5_set_extra_addresses(context, addresses); } krb5_error_code KRB5_LIB_FUNCTION krb5_set_extra_addresses(krb5_context context, const krb5_addresses *addresses) { if(context->extra_addresses) krb5_free_addresses(context, context->extra_addresses); if(addresses == NULL) { if(context->extra_addresses != NULL) { free(context->extra_addresses); context->extra_addresses = NULL; } return 0; } if(context->extra_addresses == NULL) { context->extra_addresses = malloc(sizeof(*context->extra_addresses)); if(context->extra_addresses == NULL) { krb5_set_error_string (context, "malloc: out of memory"); return ENOMEM; } } return krb5_copy_addresses(context, addresses, context->extra_addresses); } krb5_error_code KRB5_LIB_FUNCTION krb5_get_extra_addresses(krb5_context context, krb5_addresses *addresses) { if(context->extra_addresses == NULL) { memset(addresses, 0, sizeof(*addresses)); return 0; } return krb5_copy_addresses(context,context->extra_addresses, addresses); } krb5_error_code KRB5_LIB_FUNCTION krb5_add_ignore_addresses(krb5_context context, krb5_addresses *addresses) { if(context->ignore_addresses) return krb5_append_addresses(context, context->ignore_addresses, addresses); else return krb5_set_ignore_addresses(context, addresses); } krb5_error_code KRB5_LIB_FUNCTION krb5_set_ignore_addresses(krb5_context context, const krb5_addresses *addresses) { if(context->ignore_addresses) krb5_free_addresses(context, context->ignore_addresses); if(addresses == NULL) { if(context->ignore_addresses != NULL) { free(context->ignore_addresses); context->ignore_addresses = NULL; } return 0; } if(context->ignore_addresses == NULL) { context->ignore_addresses = malloc(sizeof(*context->ignore_addresses)); if(context->ignore_addresses == NULL) { krb5_set_error_string (context, "malloc: out of memory"); return ENOMEM; } } return krb5_copy_addresses(context, addresses, context->ignore_addresses); } krb5_error_code KRB5_LIB_FUNCTION krb5_get_ignore_addresses(krb5_context context, krb5_addresses *addresses) { if(context->ignore_addresses == NULL) { memset(addresses, 0, sizeof(*addresses)); return 0; } return krb5_copy_addresses(context, context->ignore_addresses, addresses); } krb5_error_code KRB5_LIB_FUNCTION krb5_set_fcache_version(krb5_context context, int version) { context->fcache_vno = version; return 0; } krb5_error_code KRB5_LIB_FUNCTION krb5_get_fcache_version(krb5_context context, int *version) { *version = context->fcache_vno; return 0; } krb5_boolean KRB5_LIB_FUNCTION krb5_is_thread_safe(void) { #ifdef ENABLE_PTHREAD_SUPPORT return TRUE; #else return FALSE; #endif } void KRB5_LIB_FUNCTION krb5_set_dns_canonicalize_hostname (krb5_context context, krb5_boolean flag) { context->dns_canonicalize_hostname = flag; } krb5_boolean KRB5_LIB_FUNCTION krb5_get_dns_canonicalize_hostname (krb5_context context) { return context->dns_canonicalize_hostname; } krb5_error_code KRB5_LIB_FUNCTION krb5_get_kdc_sec_offset (krb5_context context, int32_t *sec, int32_t *usec) { if (sec) *sec = context->kdc_sec_offset; if (usec) *usec = context->kdc_usec_offset; return 0; } time_t KRB5_LIB_FUNCTION krb5_get_max_time_skew (krb5_context context) { return context->max_skew; } void KRB5_LIB_FUNCTION krb5_set_max_time_skew (krb5_context context, time_t t) { context->max_skew = t; }