/* Unix SMB/CIFS implementation. simple kerberos5 routines for active directory Copyright (C) Andrew Tridgell 2001 Copyright (C) Luke Howard 2002-2003 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005 Copyright (C) Guenther Deschner 2005-2009 This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ #include "includes.h" #include "smb_krb5.h" #include "../librpc/gen_ndr/krb5pac.h" #include "../lib/util/asn1.h" #include "libsmb/nmblib.h" #ifndef KRB5_AUTHDATA_WIN2K_PAC #define KRB5_AUTHDATA_WIN2K_PAC 128 #endif #ifndef KRB5_AUTHDATA_IF_RELEVANT #define KRB5_AUTHDATA_IF_RELEVANT 1 #endif #ifdef HAVE_KRB5 #define GSSAPI_CHECKSUM 0x8003 /* Checksum type value for Kerberos */ #define GSSAPI_BNDLENGTH 16 /* Bind Length (rfc-1964 pg.3) */ #define GSSAPI_CHECKSUM_SIZE (4+GSSAPI_BNDLENGTH+4) /* Length of bind length, bind field, flags field. */ /* MIT krb5 1.7beta3 (in Ubuntu Karmic) is missing the prototype, but still has the symbol */ #if !HAVE_DECL_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE krb5_error_code krb5_auth_con_set_req_cksumtype( krb5_context context, krb5_auth_context auth_context, krb5_cksumtype cksumtype); #endif /************************************************************** Wrappers around kerberos string functions that convert from utf8 -> unix charset and vica versa. **************************************************************/ /************************************************************** krb5_parse_name that takes a UNIX charset. **************************************************************/ krb5_error_code smb_krb5_parse_name(krb5_context context, const char *name, /* in unix charset */ krb5_principal *principal) { krb5_error_code ret; char *utf8_name; size_t converted_size; if (!push_utf8_talloc(talloc_tos(), &utf8_name, name, &converted_size)) { return ENOMEM; } ret = krb5_parse_name(context, utf8_name, principal); TALLOC_FREE(utf8_name); return ret; } #ifdef HAVE_KRB5_PARSE_NAME_NOREALM /************************************************************** krb5_parse_name_norealm that takes a UNIX charset. **************************************************************/ static krb5_error_code smb_krb5_parse_name_norealm_conv(krb5_context context, const char *name, /* in unix charset */ krb5_principal *principal) { krb5_error_code ret; char *utf8_name; size_t converted_size; *principal = NULL; if (!push_utf8_talloc(talloc_tos(), &utf8_name, name, &converted_size)) { return ENOMEM; } ret = krb5_parse_name_norealm(context, utf8_name, principal); TALLOC_FREE(utf8_name); return ret; } #endif /************************************************************** krb5_parse_name that returns a UNIX charset name. Must be freed with talloc_free() call. **************************************************************/ krb5_error_code smb_krb5_unparse_name(TALLOC_CTX *mem_ctx, krb5_context context, krb5_const_principal principal, char **unix_name) { krb5_error_code ret; char *utf8_name; size_t converted_size; *unix_name = NULL; ret = krb5_unparse_name(context, principal, &utf8_name); if (ret) { return ret; } if (!pull_utf8_talloc(mem_ctx, unix_name, utf8_name, &converted_size)) { krb5_free_unparsed_name(context, utf8_name); return ENOMEM; } krb5_free_unparsed_name(context, utf8_name); return 0; } #ifndef HAVE_KRB5_SET_REAL_TIME /* * This function is not in the Heimdal mainline. */ krb5_error_code krb5_set_real_time(krb5_context context, int32_t seconds, int32_t microseconds) { krb5_error_code ret; int32_t sec, usec; ret = krb5_us_timeofday(context, &sec, &usec); if (ret) return ret; context->kdc_sec_offset = seconds - sec; context->kdc_usec_offset = microseconds - usec; return 0; } #endif #if !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES) #if defined(HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES) /* With MIT kerberos, we should use krb5_set_default_tgs_enctypes in preference * to krb5_set_default_tgs_ktypes. See * http://lists.samba.org/archive/samba-technical/2006-July/048271.html * * If the MIT libraries are not exporting internal symbols, we will end up in * this branch, which is correct. Otherwise we will continue to use the * internal symbol */ krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc) { return krb5_set_default_tgs_enctypes(ctx, enc); } #elif defined(HAVE_KRB5_SET_DEFAULT_IN_TKT_ETYPES) /* Heimdal */ krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc) { return krb5_set_default_in_tkt_etypes(ctx, enc); } #endif /* HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES */ #endif /* HAVE_KRB5_SET_DEFAULT_TGS_KTYPES */ #if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* HEIMDAL */ bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr) { memset(pkaddr, '\0', sizeof(krb5_address)); #if defined(HAVE_IPV6) && defined(KRB5_ADDRESS_INET6) if (paddr->ss_family == AF_INET6) { pkaddr->addr_type = KRB5_ADDRESS_INET6; pkaddr->address.length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr); pkaddr->address.data = (char *)&(((struct sockaddr_in6 *)paddr)->sin6_addr); return true; } #endif if (paddr->ss_family == AF_INET) { pkaddr->addr_type = KRB5_ADDRESS_INET; pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr); pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr); return true; } return false; } #elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */ bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr) { memset(pkaddr, '\0', sizeof(krb5_address)); #if defined(HAVE_IPV6) && defined(ADDRTYPE_INET6) if (paddr->ss_family == AF_INET6) { pkaddr->addrtype = ADDRTYPE_INET6; pkaddr->length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr); pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in6 *)paddr)->sin6_addr); return true; } #endif if (paddr->ss_family == AF_INET) { pkaddr->addrtype = ADDRTYPE_INET; pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr); pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr); return true; } return false; } #else #error UNKNOWN_ADDRTYPE #endif #if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_USE_ENCTYPE) && defined(HAVE_KRB5_STRING_TO_KEY) && defined(HAVE_KRB5_ENCRYPT_BLOCK) static int create_kerberos_key_from_string_direct(krb5_context context, krb5_principal host_princ, krb5_data *password, krb5_keyblock *key, krb5_enctype enctype) { int ret = 0; krb5_data salt; krb5_encrypt_block eblock; ret = krb5_principal2salt(context, host_princ, &salt); if (ret) { DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret))); return ret; } krb5_use_enctype(context, &eblock, enctype); ret = krb5_string_to_key(context, &eblock, key, password, &salt); SAFE_FREE(salt.data); return ret; } #elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT) static int create_kerberos_key_from_string_direct(krb5_context context, krb5_principal host_princ, krb5_data *password, krb5_keyblock *key, krb5_enctype enctype) { int ret; krb5_salt salt; ret = krb5_get_pw_salt(context, host_princ, &salt); if (ret) { DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret))); return ret; } ret = krb5_string_to_key_salt(context, enctype, (const char *)password->data, salt, key); krb5_free_salt(context, salt); return ret; } #else #error UNKNOWN_CREATE_KEY_FUNCTIONS #endif int create_kerberos_key_from_string(krb5_context context, krb5_principal host_princ, krb5_data *password, krb5_keyblock *key, krb5_enctype enctype, bool no_salt) { krb5_principal salt_princ = NULL; int ret; /* * Check if we've determined that the KDC is salting keys for this * principal/enctype in a non-obvious way. If it is, try to match * its behavior. */ if (no_salt) { KRB5_KEY_DATA(key) = (KRB5_KEY_DATA_CAST *)SMB_MALLOC(password->length); if (!KRB5_KEY_DATA(key)) { return ENOMEM; } memcpy(KRB5_KEY_DATA(key), password->data, password->length); KRB5_KEY_LENGTH(key) = password->length; KRB5_KEY_TYPE(key) = enctype; return 0; } salt_princ = kerberos_fetch_salt_princ_for_host_princ(context, host_princ, enctype); ret = create_kerberos_key_from_string_direct(context, salt_princ ? salt_princ : host_princ, password, key, enctype); if (salt_princ) { krb5_free_principal(context, salt_princ); } return ret; } #if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES) krb5_error_code get_kerberos_allowed_etypes(krb5_context context, krb5_enctype **enctypes) { return krb5_get_permitted_enctypes(context, enctypes); } #elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES) krb5_error_code get_kerberos_allowed_etypes(krb5_context context, krb5_enctype **enctypes) { return krb5_get_default_in_tkt_etypes(context, enctypes); } #else #error UNKNOWN_GET_ENCTYPES_FUNCTIONS #endif #if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context, krb5_auth_context auth_context, krb5_keyblock *keyblock) { return krb5_auth_con_setkey(context, auth_context, keyblock); } #endif bool unwrap_edata_ntstatus(TALLOC_CTX *mem_ctx, DATA_BLOB *edata, DATA_BLOB *edata_out) { DATA_BLOB edata_contents; ASN1_DATA *data; int edata_type; if (!edata->length) { return False; } data = asn1_init(mem_ctx); if (data == NULL) { return false; } asn1_load(data, *edata); asn1_start_tag(data, ASN1_SEQUENCE(0)); asn1_start_tag(data, ASN1_CONTEXT(1)); asn1_read_Integer(data, &edata_type); if (edata_type != KRB5_PADATA_PW_SALT) { DEBUG(0,("edata is not of required type %d but of type %d\n", KRB5_PADATA_PW_SALT, edata_type)); asn1_free(data); return False; } asn1_start_tag(data, ASN1_CONTEXT(2)); asn1_read_OctetString(data, talloc_tos(), &edata_contents); asn1_end_tag(data); asn1_end_tag(data); asn1_end_tag(data); asn1_free(data); *edata_out = data_blob_talloc(mem_ctx, edata_contents.data, edata_contents.length); data_blob_free(&edata_contents); return True; } bool unwrap_pac(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, DATA_BLOB *unwrapped_pac_data) { DATA_BLOB pac_contents; ASN1_DATA *data; int data_type; if (!auth_data->length) { return False; } data = asn1_init(mem_ctx); if (data == NULL) { return false; } asn1_load(data, *auth_data); asn1_start_tag(data, ASN1_SEQUENCE(0)); asn1_start_tag(data, ASN1_SEQUENCE(0)); asn1_start_tag(data, ASN1_CONTEXT(0)); asn1_read_Integer(data, &data_type); if (data_type != KRB5_AUTHDATA_WIN2K_PAC ) { DEBUG(10,("authorization data is not a Windows PAC (type: %d)\n", data_type)); asn1_free(data); return False; } asn1_end_tag(data); asn1_start_tag(data, ASN1_CONTEXT(1)); asn1_read_OctetString(data, talloc_tos(), &pac_contents); asn1_end_tag(data); asn1_end_tag(data); asn1_end_tag(data); asn1_free(data); *unwrapped_pac_data = data_blob_talloc(mem_ctx, pac_contents.data, pac_contents.length); data_blob_free(&pac_contents); return True; } bool get_auth_data_from_tkt(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, krb5_ticket *tkt) { DATA_BLOB auth_data_wrapped; bool got_auth_data_pac = False; int i; #if defined(HAVE_KRB5_TKT_ENC_PART2) if (tkt->enc_part2 && tkt->enc_part2->authorization_data && tkt->enc_part2->authorization_data[0] && tkt->enc_part2->authorization_data[0]->length) { for (i = 0; tkt->enc_part2->authorization_data[i] != NULL; i++) { if (tkt->enc_part2->authorization_data[i]->ad_type != KRB5_AUTHDATA_IF_RELEVANT) { DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n", tkt->enc_part2->authorization_data[i]->ad_type)); continue; } auth_data_wrapped = data_blob(tkt->enc_part2->authorization_data[i]->contents, tkt->enc_part2->authorization_data[i]->length); /* check if it is a PAC */ got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data); data_blob_free(&auth_data_wrapped); if (got_auth_data_pac) { return true; } } return got_auth_data_pac; } #else if (tkt->ticket.authorization_data && tkt->ticket.authorization_data->len) { for (i = 0; i < tkt->ticket.authorization_data->len; i++) { if (tkt->ticket.authorization_data->val[i].ad_type != KRB5_AUTHDATA_IF_RELEVANT) { DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n", tkt->ticket.authorization_data->val[i].ad_type)); continue; } auth_data_wrapped = data_blob(tkt->ticket.authorization_data->val[i].ad_data.data, tkt->ticket.authorization_data->val[i].ad_data.length); /* check if it is a PAC */ got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data); data_blob_free(&auth_data_wrapped); if (got_auth_data_pac) { return true; } } return got_auth_data_pac; } #endif return False; } krb5_const_principal get_principal_from_tkt(krb5_ticket *tkt) { #if defined(HAVE_KRB5_TKT_ENC_PART2) return tkt->enc_part2->client; #else return tkt->client; #endif } #if !defined(HAVE_KRB5_LOCATE_KDC) /* krb5_locate_kdc is an internal MIT symbol. MIT are not yet willing to commit * to a public interface for this functionality, so we have to be able to live * without it if the MIT libraries are hiding their internal symbols. */ #if defined(KRB5_KRBHST_INIT) /* Heimdal */ krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm, struct sockaddr **addr_pp, int *naddrs, int get_masters) { krb5_krbhst_handle hnd; krb5_krbhst_info *hinfo; krb5_error_code rc; int num_kdcs, i; struct sockaddr *sa; struct addrinfo *ai; *addr_pp = NULL; *naddrs = 0; rc = krb5_krbhst_init(ctx, realm->data, KRB5_KRBHST_KDC, &hnd); if (rc) { DEBUG(0, ("smb_krb5_locate_kdc: krb5_krbhst_init failed (%s)\n", error_message(rc))); return rc; } for ( num_kdcs = 0; (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); num_kdcs++) ; krb5_krbhst_reset(ctx, hnd); if (!num_kdcs) { DEBUG(0, ("smb_krb5_locate_kdc: zero kdcs found !\n")); krb5_krbhst_free(ctx, hnd); return -1; } sa = SMB_MALLOC_ARRAY( struct sockaddr, num_kdcs ); if (!sa) { DEBUG(0, ("smb_krb5_locate_kdc: malloc failed\n")); krb5_krbhst_free(ctx, hnd); naddrs = 0; return -1; } memset(sa, '\0', sizeof(struct sockaddr) * num_kdcs ); for (i = 0; i < num_kdcs && (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); i++) { #if defined(HAVE_KRB5_KRBHST_GET_ADDRINFO) rc = krb5_krbhst_get_addrinfo(ctx, hinfo, &ai); if (rc) { DEBUG(0,("krb5_krbhst_get_addrinfo failed: %s\n", error_message(rc))); continue; } #endif if (hinfo->ai && hinfo->ai->ai_family == AF_INET) memcpy(&sa[i], hinfo->ai->ai_addr, sizeof(struct sockaddr)); } krb5_krbhst_free(ctx, hnd); *naddrs = num_kdcs; *addr_pp = sa; return 0; } #else /* ! defined(KRB5_KRBHST_INIT) */ krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm, struct sockaddr **addr_pp, int *naddrs, int get_masters) { DEBUG(0, ("unable to explicitly locate the KDC on this platform\n")); return KRB5_KDC_UNREACH; } #endif /* KRB5_KRBHST_INIT */ #else /* ! HAVE_KRB5_LOCATE_KDC */ krb5_error_code smb_krb5_locate_kdc(krb5_context ctx, const krb5_data *realm, struct sockaddr **addr_pp, int *naddrs, int get_masters) { return krb5_locate_kdc(ctx, realm, addr_pp, naddrs, get_masters); } #endif /* HAVE_KRB5_LOCATE_KDC */ #if !defined(HAVE_KRB5_FREE_UNPARSED_NAME) void krb5_free_unparsed_name(krb5_context context, char *val) { SAFE_FREE(val); } #endif void kerberos_free_data_contents(krb5_context context, krb5_data *pdata) { #if defined(HAVE_KRB5_FREE_DATA_CONTENTS) if (pdata->data) { krb5_free_data_contents(context, pdata); } #else SAFE_FREE(pdata->data); #endif } void kerberos_set_creds_enctype(krb5_creds *pcreds, int enctype) { #if defined(HAVE_KRB5_KEYBLOCK_IN_CREDS) KRB5_KEY_TYPE((&pcreds->keyblock)) = enctype; #elif defined(HAVE_KRB5_SESSION_IN_CREDS) KRB5_KEY_TYPE((&pcreds->session)) = enctype; #else #error UNKNOWN_KEYBLOCK_MEMBER_IN_KRB5_CREDS_STRUCT #endif } bool kerberos_compatible_enctypes(krb5_context context, krb5_enctype enctype1, krb5_enctype enctype2) { #if defined(HAVE_KRB5_C_ENCTYPE_COMPARE) krb5_boolean similar = 0; krb5_c_enctype_compare(context, enctype1, enctype2, &similar); return similar ? True : False; #elif defined(HAVE_KRB5_ENCTYPES_COMPATIBLE_KEYS) return krb5_enctypes_compatible_keys(context, enctype1, enctype2) ? True : False; #endif } static bool ads_cleanup_expired_creds(krb5_context context, krb5_ccache ccache, krb5_creds *credsp) { krb5_error_code retval; const char *cc_type = krb5_cc_get_type(context, ccache); DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n", cc_type, krb5_cc_get_name(context, ccache), http_timestring(talloc_tos(), credsp->times.endtime))); /* we will probably need new tickets if the current ones will expire within 10 seconds. */ if (credsp->times.endtime >= (time(NULL) + 10)) return False; /* heimdal won't remove creds from a file ccache, and perhaps we shouldn't anyway, since internally we use memory ccaches, and a FILE one probably means that we're using creds obtained outside of our exectuable */ if (strequal(cc_type, "FILE")) { DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type)); return False; } retval = krb5_cc_remove_cred(context, ccache, 0, credsp); if (retval) { DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n", error_message(retval))); /* If we have an error in this, we want to display it, but continue as though we deleted it */ } return True; } /* Allocate and setup the auth context into the state we need. */ static krb5_error_code setup_auth_context(krb5_context context, krb5_auth_context *auth_context) { krb5_error_code retval; retval = krb5_auth_con_init(context, auth_context ); if (retval) { DEBUG(1,("krb5_auth_con_init failed (%s)\n", error_message(retval))); return retval; } /* Ensure this is an addressless ticket. */ retval = krb5_auth_con_setaddrs(context, *auth_context, NULL, NULL); if (retval) { DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n", error_message(retval))); } return retval; } static krb5_error_code create_gss_checksum(krb5_data *in_data, /* [inout] */ uint32_t gss_flags) { unsigned int orig_length = in_data->length; unsigned int base_cksum_size = GSSAPI_CHECKSUM_SIZE; char *gss_cksum = NULL; if (orig_length) { /* Extra length field for delgated ticket. */ base_cksum_size += 4; } if ((unsigned int)base_cksum_size + orig_length < (unsigned int)base_cksum_size) { return EINVAL; } gss_cksum = (char *)SMB_MALLOC(base_cksum_size + orig_length); if (gss_cksum == NULL) { return ENOMEM; } memset(gss_cksum, '\0', base_cksum_size + orig_length); SIVAL(gss_cksum, 0, GSSAPI_BNDLENGTH); /* * GSS_C_NO_CHANNEL_BINDINGS means 16 zero bytes. * This matches the behavior of heimdal and mit. * * And it is needed to work against some closed source * SMB servers. * * See bug #7883 */ memset(&gss_cksum[4], 0x00, GSSAPI_BNDLENGTH); SIVAL(gss_cksum, 20, gss_flags); if (orig_length) { SSVAL(gss_cksum, 24, 1); /* The Delegation Option identifier */ SSVAL(gss_cksum, 26, orig_length); /* Copy the kerberos KRB_CRED data */ memcpy(gss_cksum + 28, in_data->data, orig_length); free(in_data->data); in_data->data = NULL; in_data->length = 0; } in_data->data = gss_cksum; in_data->length = base_cksum_size + orig_length; return 0; } /* we can't use krb5_mk_req because w2k wants the service to be in a particular format */ static krb5_error_code ads_krb5_mk_req(krb5_context context, krb5_auth_context *auth_context, const krb5_flags ap_req_options, const char *principal, krb5_ccache ccache, krb5_data *outbuf, time_t *expire_time, const char *impersonate_princ_s) { krb5_error_code retval; krb5_principal server; krb5_principal impersonate_princ = NULL; krb5_creds * credsp; krb5_creds creds; krb5_data in_data; bool creds_ready = False; int i = 0, maxtries = 3; uint32_t gss_flags = 0; ZERO_STRUCT(in_data); retval = smb_krb5_parse_name(context, principal, &server); if (retval) { DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal)); return retval; } if (impersonate_princ_s) { retval = smb_krb5_parse_name(context, impersonate_princ_s, &impersonate_princ); if (retval) { DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", impersonate_princ_s)); goto cleanup_princ; } } /* obtain ticket & session key */ ZERO_STRUCT(creds); if ((retval = krb5_copy_principal(context, server, &creds.server))) { DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n", error_message(retval))); goto cleanup_princ; } if ((retval = krb5_cc_get_principal(context, ccache, &creds.client))) { /* This can commonly fail on smbd startup with no ticket in the cache. * Report at higher level than 1. */ DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n", error_message(retval))); goto cleanup_creds; } while (!creds_ready && (i < maxtries)) { if ((retval = smb_krb5_get_credentials(context, ccache, creds.client, creds.server, impersonate_princ, &credsp))) { DEBUG(1,("ads_krb5_mk_req: smb_krb5_get_credentials failed for %s (%s)\n", principal, error_message(retval))); goto cleanup_creds; } /* cope with ticket being in the future due to clock skew */ if ((unsigned)credsp->times.starttime > time(NULL)) { time_t t = time(NULL); int time_offset =(int)((unsigned)credsp->times.starttime-t); DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset)); krb5_set_real_time(context, t + time_offset + 1, 0); } if (!ads_cleanup_expired_creds(context, ccache, credsp)) { creds_ready = True; } i++; } DEBUG(10,("ads_krb5_mk_req: Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n", principal, krb5_cc_get_type(context, ccache), krb5_cc_get_name(context, ccache), http_timestring(talloc_tos(), (unsigned)credsp->times.endtime), (unsigned)credsp->times.endtime)); if (expire_time) { *expire_time = (time_t)credsp->times.endtime; } /* Allocate the auth_context. */ retval = setup_auth_context(context, auth_context); if (retval) { DEBUG(1,("setup_auth_context failed (%s)\n", error_message(retval))); goto cleanup_creds; } #if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_FWD_TGT_CREDS) && defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE) if( credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE ) { /* Fetch a forwarded TGT from the KDC so that we can hand off a 2nd ticket as part of the kerberos exchange. */ DEBUG( 3, ("ads_krb5_mk_req: server marked as OK to delegate to, building forwardable TGT\n") ); retval = krb5_auth_con_setuseruserkey(context, *auth_context, &credsp->keyblock ); if (retval) { DEBUG(1,("krb5_auth_con_setuseruserkey failed (%s)\n", error_message(retval))); goto cleanup_creds; } /* Must use a subkey for forwarded tickets. */ retval = krb5_auth_con_setflags(context, *auth_context, KRB5_AUTH_CONTEXT_USE_SUBKEY); if (retval) { DEBUG(1,("krb5_auth_con_setflags failed (%s)\n", error_message(retval))); goto cleanup_creds; } retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */ *auth_context, /* Authentication context [in] */ CONST_DISCARD(char *, KRB5_TGS_NAME), /* Ticket service name ("krbtgt") [in] */ credsp->client, /* Client principal for the tgt [in] */ credsp->server, /* Server principal for the tgt [in] */ ccache, /* Credential cache to use for storage [in] */ 1, /* Turn on for "Forwardable ticket" [in] */ &in_data ); /* Resulting response [out] */ if (retval) { DEBUG( 3, ("krb5_fwd_tgt_creds failed (%s)\n", error_message( retval ) ) ); /* * This is not fatal. Delete the *auth_context and continue * with krb5_mk_req_extended to get a non-forwardable ticket. */ if (in_data.data) { free( in_data.data ); in_data.data = NULL; in_data.length = 0; } krb5_auth_con_free(context, *auth_context); *auth_context = NULL; retval = setup_auth_context(context, auth_context); if (retval) { DEBUG(1,("setup_auth_context failed (%s)\n", error_message(retval))); goto cleanup_creds; } } else { /* We got a delegated ticket. */ gss_flags |= GSS_C_DELEG_FLAG; } } /* Frees and reallocates in_data into a GSS checksum blob. */ retval = create_gss_checksum(&in_data, gss_flags); if (retval) { goto cleanup_data; } /* We always want GSS-checksum types. */ retval = krb5_auth_con_set_req_cksumtype(context, *auth_context, GSSAPI_CHECKSUM ); if (retval) { DEBUG(1,("krb5_auth_con_set_req_cksumtype failed (%s)\n", error_message(retval))); goto cleanup_data; } #endif retval = krb5_mk_req_extended(context, auth_context, ap_req_options, &in_data, credsp, outbuf); if (retval) { DEBUG(1,("ads_krb5_mk_req: krb5_mk_req_extended failed (%s)\n", error_message(retval))); } cleanup_data: if (in_data.data) { free( in_data.data ); in_data.length = 0; } krb5_free_creds(context, credsp); cleanup_creds: krb5_free_cred_contents(context, &creds); cleanup_princ: krb5_free_principal(context, server); if (impersonate_princ) { krb5_free_principal(context, impersonate_princ); } return retval; } /* get a kerberos5 ticket for the given service */ int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx, const char *principal, time_t time_offset, DATA_BLOB *ticket, DATA_BLOB *session_key_krb5, uint32_t extra_ap_opts, const char *ccname, time_t *tgs_expire, const char *impersonate_princ_s) { krb5_error_code retval; krb5_data packet; krb5_context context = NULL; krb5_ccache ccdef = NULL; krb5_auth_context auth_context = NULL; krb5_enctype enc_types[] = { ENCTYPE_ARCFOUR_HMAC, ENCTYPE_DES_CBC_MD5, ENCTYPE_DES_CBC_CRC, ENCTYPE_NULL}; initialize_krb5_error_table(); retval = krb5_init_context(&context); if (retval) { DEBUG(1, ("krb5_init_context failed (%s)\n", error_message(retval))); goto failed; } if (time_offset != 0) { krb5_set_real_time(context, time(NULL) + time_offset, 0); } if ((retval = krb5_cc_resolve(context, ccname ? ccname : krb5_cc_default_name(context), &ccdef))) { DEBUG(1, ("krb5_cc_default failed (%s)\n", error_message(retval))); goto failed; } if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) { DEBUG(1, ("krb5_set_default_tgs_ktypes failed (%s)\n", error_message(retval))); goto failed; } retval = ads_krb5_mk_req(context, &auth_context, AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts, principal, ccdef, &packet, tgs_expire, impersonate_princ_s); if (retval) { goto failed; } get_krb5_smb_session_key(mem_ctx, context, auth_context, session_key_krb5, false); *ticket = data_blob_talloc(mem_ctx, packet.data, packet.length); kerberos_free_data_contents(context, &packet); failed: if (context) { if (ccdef) krb5_cc_close(context, ccdef); if (auth_context) krb5_auth_con_free(context, auth_context); krb5_free_context(context); } return retval; } bool get_krb5_smb_session_key(TALLOC_CTX *mem_ctx, krb5_context context, krb5_auth_context auth_context, DATA_BLOB *session_key, bool remote) { krb5_keyblock *skey = NULL; krb5_error_code err = 0; bool ret = false; if (remote) { err = krb5_auth_con_getremotesubkey(context, auth_context, &skey); } else { err = krb5_auth_con_getlocalsubkey(context, auth_context, &skey); } if (err || skey == NULL) { DEBUG(10, ("KRB5 error getting session key %d\n", err)); goto done; } DEBUG(10, ("Got KRB5 session key of length %d\n", (int)KRB5_KEY_LENGTH(skey))); *session_key = data_blob_talloc(mem_ctx, KRB5_KEY_DATA(skey), KRB5_KEY_LENGTH(skey)); dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length); ret = true; done: if (skey) { krb5_free_keyblock(context, skey); } return ret; } #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT) const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i ); const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i ) { static krb5_data kdata; kdata.data = (char *)krb5_principal_get_comp_string(context, principal, i); kdata.length = strlen((const char *)kdata.data); return &kdata; } #endif krb5_error_code smb_krb5_kt_free_entry(krb5_context context, krb5_keytab_entry *kt_entry) { /* Try krb5_free_keytab_entry_contents first, since * MIT Kerberos >= 1.7 has both krb5_free_keytab_entry_contents and * krb5_kt_free_entry but only has a prototype for the first, while the * second is considered private. */ #if defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS) return krb5_free_keytab_entry_contents(context, kt_entry); #elif defined(HAVE_KRB5_KT_FREE_ENTRY) return krb5_kt_free_entry(context, kt_entry); #else #error UNKNOWN_KT_FREE_FUNCTION #endif } void smb_krb5_checksum_from_pac_sig(krb5_checksum *cksum, struct PAC_SIGNATURE_DATA *sig) { #ifdef HAVE_CHECKSUM_IN_KRB5_CHECKSUM cksum->cksumtype = (krb5_cksumtype)sig->type; cksum->checksum.length = sig->signature.length; cksum->checksum.data = sig->signature.data; #else cksum->checksum_type = (krb5_cksumtype)sig->type; cksum->length = sig->signature.length; cksum->contents = sig->signature.data; #endif } krb5_error_code smb_krb5_verify_checksum(krb5_context context, const krb5_keyblock *keyblock, krb5_keyusage usage, krb5_checksum *cksum, uint8 *data, size_t length) { krb5_error_code ret; /* verify the checksum */ /* welcome to the wonderful world of samba's kerberos abstraction layer: * * function heimdal 0.6.1rc3 heimdal 0.7 MIT krb 1.4.2 * ----------------------------------------------------------------------------- * krb5_c_verify_checksum - works works * krb5_verify_checksum works (6 args) works (6 args) broken (7 args) */ #if defined(HAVE_KRB5_C_VERIFY_CHECKSUM) { krb5_boolean checksum_valid = False; krb5_data input; input.data = (char *)data; input.length = length; ret = krb5_c_verify_checksum(context, keyblock, usage, &input, cksum, &checksum_valid); if (ret) { DEBUG(3,("smb_krb5_verify_checksum: krb5_c_verify_checksum() failed: %s\n", error_message(ret))); return ret; } if (!checksum_valid) ret = KRB5KRB_AP_ERR_BAD_INTEGRITY; } #elif KRB5_VERIFY_CHECKSUM_ARGS == 6 && defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CRYPTO) && defined(HAVE_KRB5_CRYPTO_DESTROY) /* Warning: MIT's krb5_verify_checksum cannot be used as it will use a key * without enctype and it ignores any key_usage types - Guenther */ { krb5_crypto crypto; ret = krb5_crypto_init(context, keyblock, 0, &crypto); if (ret) { DEBUG(0,("smb_krb5_verify_checksum: krb5_crypto_init() failed: %s\n", error_message(ret))); return ret; } ret = krb5_verify_checksum(context, crypto, usage, data, length, cksum); krb5_crypto_destroy(context, crypto); } #else #error UNKNOWN_KRB5_VERIFY_CHECKSUM_FUNCTION #endif return ret; } time_t get_authtime_from_tkt(krb5_ticket *tkt) { #if defined(HAVE_KRB5_TKT_ENC_PART2) return tkt->enc_part2->times.authtime; #else return tkt->ticket.authtime; #endif } #ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */ static int get_kvno_from_ap_req(krb5_ap_req *ap_req) { #ifdef HAVE_TICKET_POINTER_IN_KRB5_AP_REQ /* MIT */ if (ap_req->ticket->enc_part.kvno) return ap_req->ticket->enc_part.kvno; #else /* Heimdal */ if (ap_req->ticket.enc_part.kvno) return *ap_req->ticket.enc_part.kvno; #endif return 0; } static krb5_enctype get_enctype_from_ap_req(krb5_ap_req *ap_req) { #ifdef HAVE_ETYPE_IN_ENCRYPTEDDATA /* Heimdal */ return ap_req->ticket.enc_part.etype; #else /* MIT */ return ap_req->ticket->enc_part.enctype; #endif } #endif /* HAVE_KRB5_DECODE_AP_REQ */ static krb5_error_code get_key_from_keytab(krb5_context context, krb5_const_principal server, krb5_enctype enctype, krb5_kvno kvno, krb5_keyblock **out_key) { krb5_keytab_entry entry; krb5_error_code ret; krb5_keytab keytab; char *name = NULL; krb5_keyblock *keyp; /* We have to open a new keytab handle here, as MIT does an implicit open/getnext/close on krb5_kt_get_entry. We may be in the middle of a keytab enumeration when this is called. JRA. */ ret = smb_krb5_open_keytab(context, NULL, False, &keytab); if (ret) { DEBUG(1,("get_key_from_keytab: smb_krb5_open_keytab failed (%s)\n", error_message(ret))); return ret; } if ( DEBUGLEVEL >= 10 ) { if (smb_krb5_unparse_name(talloc_tos(), context, server, &name) == 0) { DEBUG(10,("get_key_from_keytab: will look for kvno %d, enctype %d and name: %s\n", kvno, enctype, name)); TALLOC_FREE(name); } } ret = krb5_kt_get_entry(context, keytab, server, kvno, enctype, &entry); if (ret) { DEBUG(0,("get_key_from_keytab: failed to retrieve key: %s\n", error_message(ret))); goto out; } keyp = KRB5_KT_KEY(&entry); ret = krb5_copy_keyblock(context, keyp, out_key); if (ret) { DEBUG(0,("get_key_from_keytab: failed to copy key: %s\n", error_message(ret))); goto out; } smb_krb5_kt_free_entry(context, &entry); out: krb5_kt_close(context, keytab); return ret; } /* Prototypes */ krb5_error_code smb_krb5_get_keyinfo_from_ap_req(krb5_context context, const krb5_data *inbuf, krb5_kvno *kvno, krb5_enctype *enctype) { #ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */ { krb5_error_code ret; krb5_ap_req ap_req; ret = krb5_decode_ap_req(context, inbuf, &ap_req); if (ret) return ret; *kvno = get_kvno_from_ap_req(&ap_req); *enctype = get_enctype_from_ap_req(&ap_req); free_AP_REQ(&ap_req); return 0; } #endif /* Possibly not an appropriate error code. */ return KRB5KDC_ERR_BADOPTION; } krb5_error_code krb5_rd_req_return_keyblock_from_keytab(krb5_context context, krb5_auth_context *auth_context, const krb5_data *inbuf, krb5_const_principal server, krb5_keytab keytab, krb5_flags *ap_req_options, krb5_ticket **ticket, krb5_keyblock **keyblock) { krb5_error_code ret; krb5_kvno kvno; krb5_enctype enctype; krb5_keyblock *local_keyblock; ret = krb5_rd_req(context, auth_context, inbuf, server, keytab, ap_req_options, ticket); if (ret) { return ret; } #ifdef KRB5_TICKET_HAS_KEYINFO enctype = (*ticket)->enc_part.enctype; kvno = (*ticket)->enc_part.kvno; #else ret = smb_krb5_get_keyinfo_from_ap_req(context, inbuf, &kvno, &enctype); if (ret) { return ret; } #endif ret = get_key_from_keytab(context, server, enctype, kvno, &local_keyblock); if (ret) { DEBUG(0,("krb5_rd_req_return_keyblock_from_keytab: failed to call get_key_from_keytab\n")); goto out; } out: if (ret && local_keyblock != NULL) { krb5_free_keyblock(context, local_keyblock); } else { *keyblock = local_keyblock; } return ret; } krb5_error_code smb_krb5_parse_name_norealm(krb5_context context, const char *name, krb5_principal *principal) { #ifdef HAVE_KRB5_PARSE_NAME_NOREALM return smb_krb5_parse_name_norealm_conv(context, name, principal); #endif /* we are cheating here because parse_name will in fact set the realm. * We don't care as the only caller of smb_krb5_parse_name_norealm * ignores the realm anyway when calling * smb_krb5_principal_compare_any_realm later - Guenther */ return smb_krb5_parse_name(context, name, principal); } bool smb_krb5_principal_compare_any_realm(krb5_context context, krb5_const_principal princ1, krb5_const_principal princ2) { #ifdef HAVE_KRB5_PRINCIPAL_COMPARE_ANY_REALM return krb5_principal_compare_any_realm(context, princ1, princ2); /* krb5_princ_size is a macro in MIT */ #elif defined(HAVE_KRB5_PRINC_SIZE) || defined(krb5_princ_size) int i, len1, len2; const krb5_data *p1, *p2; len1 = krb5_princ_size(context, princ1); len2 = krb5_princ_size(context, princ2); if (len1 != len2) return False; for (i = 0; i < len1; i++) { p1 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ1), i); p2 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ2), i); if (p1->length != p2->length || memcmp(p1->data, p2->data, p1->length)) return False; } return True; #else #error NO_SUITABLE_PRINCIPAL_COMPARE_FUNCTION #endif } krb5_error_code smb_krb5_renew_ticket(const char *ccache_string, /* FILE:/tmp/krb5cc_0 */ const char *client_string, /* gd@BER.SUSE.DE */ const char *service_string, /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */ time_t *expire_time) { krb5_error_code ret; krb5_context context = NULL; krb5_ccache ccache = NULL; krb5_principal client = NULL; krb5_creds creds, creds_in, *creds_out = NULL; ZERO_STRUCT(creds); ZERO_STRUCT(creds_in); initialize_krb5_error_table(); ret = krb5_init_context(&context); if (ret) { goto done; } if (!ccache_string) { ccache_string = krb5_cc_default_name(context); } if (!ccache_string) { ret = EINVAL; goto done; } DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string)); /* FIXME: we should not fall back to defaults */ ret = krb5_cc_resolve(context, CONST_DISCARD(char *, ccache_string), &ccache); if (ret) { goto done; } if (client_string) { ret = smb_krb5_parse_name(context, client_string, &client); if (ret) { goto done; } } else { ret = krb5_cc_get_principal(context, ccache, &client); if (ret) { goto done; } } #ifdef HAVE_KRB5_GET_RENEWED_CREDS /* MIT */ { ret = krb5_get_renewed_creds(context, &creds, client, ccache, CONST_DISCARD(char *, service_string)); if (ret) { DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret))); goto done; } } #elif defined(HAVE_KRB5_GET_KDC_CRED) /* Heimdal */ { krb5_kdc_flags flags; krb5_realm *client_realm = NULL; ret = krb5_copy_principal(context, client, &creds_in.client); if (ret) { goto done; } if (service_string) { ret = smb_krb5_parse_name(context, service_string, &creds_in.server); if (ret) { goto done; } } else { /* build tgt service by default */ client_realm = krb5_princ_realm(context, creds_in.client); if (!client_realm) { ret = ENOMEM; goto done; } ret = krb5_make_principal(context, &creds_in.server, *client_realm, KRB5_TGS_NAME, *client_realm, NULL); if (ret) { goto done; } } flags.i = 0; flags.b.renewable = flags.b.renew = True; ret = krb5_get_kdc_cred(context, ccache, flags, NULL, NULL, &creds_in, &creds_out); if (ret) { DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret))); goto done; } creds = *creds_out; } #else #error NO_SUITABLE_KRB5_TICKET_RENEW_FUNCTION_AVAILABLE #endif /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */ ret = krb5_cc_initialize(context, ccache, client); if (ret) { goto done; } ret = krb5_cc_store_cred(context, ccache, &creds); if (expire_time) { *expire_time = (time_t) creds.times.endtime; } done: krb5_free_cred_contents(context, &creds_in); if (creds_out) { krb5_free_creds(context, creds_out); } else { krb5_free_cred_contents(context, &creds); } if (client) { krb5_free_principal(context, client); } if (ccache) { krb5_cc_close(context, ccache); } if (context) { krb5_free_context(context); } return ret; } krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr) { krb5_error_code ret = 0; if (addr == NULL) { return ret; } #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */ krb5_free_addresses(context, addr->addrs); #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */ ret = krb5_free_addresses(context, addr->addrs); SAFE_FREE(addr->addrs); #endif SAFE_FREE(addr); addr = NULL; return ret; } krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr) { krb5_error_code ret = 0; nstring buf; #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */ krb5_address **addrs = NULL; #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */ krb5_addresses *addrs = NULL; #endif *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses)); if (*kerb_addr == NULL) { return ENOMEM; } put_name(buf, global_myname(), ' ', 0x20); #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */ { int num_addr = 2; addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr); if (addrs == NULL) { SAFE_FREE(*kerb_addr); return ENOMEM; } memset(addrs, 0, sizeof(krb5_address *) * num_addr); addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address)); if (addrs[0] == NULL) { SAFE_FREE(addrs); SAFE_FREE(*kerb_addr); return ENOMEM; } addrs[0]->magic = KV5M_ADDRESS; addrs[0]->addrtype = KRB5_ADDR_NETBIOS; addrs[0]->length = MAX_NETBIOSNAME_LEN; addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length); if (addrs[0]->contents == NULL) { SAFE_FREE(addrs[0]); SAFE_FREE(addrs); SAFE_FREE(*kerb_addr); return ENOMEM; } memcpy(addrs[0]->contents, buf, addrs[0]->length); addrs[1] = NULL; } #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */ { addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses)); if (addrs == NULL) { SAFE_FREE(*kerb_addr); return ENOMEM; } memset(addrs, 0, sizeof(krb5_addresses)); addrs->len = 1; addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address)); if (addrs->val == NULL) { SAFE_FREE(addrs); SAFE_FREE(kerb_addr); return ENOMEM; } addrs->val[0].addr_type = KRB5_ADDR_NETBIOS; addrs->val[0].address.length = MAX_NETBIOSNAME_LEN; addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length); if (addrs->val[0].address.data == NULL) { SAFE_FREE(addrs->val); SAFE_FREE(addrs); SAFE_FREE(*kerb_addr); return ENOMEM; } memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length); } #else #error UNKNOWN_KRB5_ADDRESS_FORMAT #endif (*kerb_addr)->addrs = addrs; return ret; } void smb_krb5_free_error(krb5_context context, krb5_error *krberror) { #ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */ krb5_free_error_contents(context, krberror); #else /* MIT */ krb5_free_error(context, krberror); #endif } krb5_error_code handle_krberror_packet(krb5_context context, krb5_data *packet) { krb5_error_code ret; bool got_error_code = False; DEBUG(10,("handle_krberror_packet: got error packet\n")); #ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */ { krb5_error krberror; if ((ret = krb5_rd_error(context, packet, &krberror))) { DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n", error_message(ret))); return ret; } if (krberror.e_data == NULL || krberror.e_data->data == NULL) { ret = (krb5_error_code) krberror.error_code; got_error_code = True; } smb_krb5_free_error(context, &krberror); } #else /* MIT */ { krb5_error *krberror; if ((ret = krb5_rd_error(context, packet, &krberror))) { DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n", error_message(ret))); return ret; } if (krberror->e_data.data == NULL) { #if defined(ERROR_TABLE_BASE_krb5) ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error; #else ret = (krb5_error_code)krberror->error; #endif got_error_code = True; } smb_krb5_free_error(context, krberror); } #endif if (got_error_code) { DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n", error_message(ret), ret)); } return ret; } krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context, krb5_get_init_creds_opt **opt) { #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC /* Heimdal or modern MIT version */ return krb5_get_init_creds_opt_alloc(context, opt); #else /* Historical MIT version */ krb5_get_init_creds_opt *my_opt; *opt = NULL; if ((my_opt = SMB_MALLOC_P(krb5_get_init_creds_opt)) == NULL) { return ENOMEM; } krb5_get_init_creds_opt_init(my_opt); *opt = my_opt; return 0; #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC */ } void smb_krb5_get_init_creds_opt_free(krb5_context context, krb5_get_init_creds_opt *opt) { #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_FREE #ifdef KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT /* Modern MIT or Heimdal version */ krb5_get_init_creds_opt_free(context, opt); #else /* Heimdal version */ krb5_get_init_creds_opt_free(opt); #endif /* KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT */ #else /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */ /* Historical MIT version */ SAFE_FREE(opt); opt = NULL; #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */ } krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry) { return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry)); } /* caller needs to free etype_s */ krb5_error_code smb_krb5_enctype_to_string(krb5_context context, krb5_enctype enctype, char **etype_s) { #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */ #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG) char buf[256]; krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */ if (ret) { return ret; } *etype_s = SMB_STRDUP(buf); if (!*etype_s) { return ENOMEM; } return ret; #else #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION #endif } krb5_error_code smb_krb5_mk_error(krb5_context context, krb5_error_code error_code, const krb5_principal server, krb5_data *reply) { #ifdef HAVE_SHORT_KRB5_MK_ERROR_INTERFACE /* MIT */ /* * The MIT interface is *terrible*. * We have to construct this ourselves... */ krb5_error e; memset(&e, 0, sizeof(e)); krb5_us_timeofday(context, &e.stime, &e.susec); e.server = server; #if defined(krb5_err_base) e.error = error_code - krb5_err_base; #elif defined(ERROR_TABLE_BASE_krb5) e.error = error_code - ERROR_TABLE_BASE_krb5; #else e.error = error_code; /* Almost certainly wrong, but what can we do... ? */ #endif return krb5_mk_error(context, &e, reply); #else /* Heimdal. */ return krb5_mk_error(context, error_code, NULL, NULL, /* e_data */ NULL, server, NULL, NULL, reply); #endif } /********************************************************************** * Open a krb5 keytab with flags, handles readonly or readwrite access and * allows to process non-default keytab names. * @param context krb5_context * @param keytab_name_req string * @param write_access bool if writable keytab is required * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close()) * @return krb5_error_code **********************************************************************/ /* This MAX_NAME_LEN is a constant defined in krb5.h */ #ifndef MAX_KEYTAB_NAME_LEN #define MAX_KEYTAB_NAME_LEN 1100 #endif krb5_error_code smb_krb5_open_keytab(krb5_context context, const char *keytab_name_req, bool write_access, krb5_keytab *keytab) { krb5_error_code ret = 0; TALLOC_CTX *mem_ctx; char keytab_string[MAX_KEYTAB_NAME_LEN]; char *kt_str = NULL; bool found_valid_name = False; const char *pragma = "FILE"; const char *tmp = NULL; if (!write_access && !keytab_name_req) { /* caller just wants to read the default keytab readonly, so be it */ return krb5_kt_default(context, keytab); } mem_ctx = talloc_init("smb_krb5_open_keytab"); if (!mem_ctx) { return ENOMEM; } #ifdef HAVE_WRFILE_KEYTAB if (write_access) { pragma = "WRFILE"; } #endif if (keytab_name_req) { if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) { ret = KRB5_CONFIG_NOTENUFSPACE; goto out; } if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) || (strncmp(keytab_name_req, "FILE:/", 6) == 0)) { tmp = keytab_name_req; goto resolve; } if (keytab_name_req[0] != '/') { ret = KRB5_KT_BADNAME; goto out; } tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req); if (!tmp) { ret = ENOMEM; goto out; } goto resolve; } /* we need to handle more complex keytab_strings, like: * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */ ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2); if (ret) { goto out; } DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string)); tmp = talloc_strdup(mem_ctx, keytab_string); if (!tmp) { ret = ENOMEM; goto out; } if (strncmp(tmp, "ANY:", 4) == 0) { tmp += 4; } memset(&keytab_string, '\0', sizeof(keytab_string)); while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) { if (strncmp(kt_str, "WRFILE:", 7) == 0) { found_valid_name = True; tmp = kt_str; tmp += 7; } if (strncmp(kt_str, "FILE:", 5) == 0) { found_valid_name = True; tmp = kt_str; tmp += 5; } if (tmp[0] == '/') { /* Treat as a FILE: keytab definition. */ found_valid_name = true; } if (found_valid_name) { if (tmp[0] != '/') { ret = KRB5_KT_BADNAME; goto out; } tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp); if (!tmp) { ret = ENOMEM; goto out; } break; } } if (!found_valid_name) { ret = KRB5_KT_UNKNOWN_TYPE; goto out; } resolve: DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp)); ret = krb5_kt_resolve(context, tmp, keytab); out: TALLOC_FREE(mem_ctx); return ret; } krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx, krb5_context context, krb5_keytab keytab, const char **keytab_name) { char keytab_string[MAX_KEYTAB_NAME_LEN]; krb5_error_code ret = 0; ret = krb5_kt_get_name(context, keytab, keytab_string, MAX_KEYTAB_NAME_LEN - 2); if (ret) { return ret; } *keytab_name = talloc_strdup(mem_ctx, keytab_string); if (!*keytab_name) { return ENOMEM; } return ret; } #if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \ defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \ defined(HAVE_KRB5_GET_CREDS) static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context, krb5_ccache ccache, krb5_principal me, krb5_principal server, krb5_principal impersonate_princ, krb5_creds **out_creds) { krb5_error_code ret; krb5_get_creds_opt opt; ret = krb5_get_creds_opt_alloc(context, &opt); if (ret) { goto done; } krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE); if (impersonate_princ) { ret = krb5_get_creds_opt_set_impersonate(context, opt, impersonate_princ); if (ret) { goto done; } } ret = krb5_get_creds(context, opt, ccache, server, out_creds); if (ret) { goto done; } done: if (opt) { krb5_get_creds_opt_free(context, opt); } return ret; } #endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */ #ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context, krb5_ccache ccache, krb5_principal me, krb5_principal server, krb5_principal impersonate_princ, krb5_creds **out_creds) { krb5_error_code ret; krb5_creds in_creds; #if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER krb5_error_code KRB5_CALLCONV krb5_get_credentials_for_user(krb5_context context, krb5_flags options, krb5_ccache ccache, krb5_creds *in_creds, krb5_data *subject_cert, krb5_creds **out_creds); #endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */ ZERO_STRUCT(in_creds); if (impersonate_princ) { in_creds.server = me; in_creds.client = impersonate_princ; ret = krb5_get_credentials_for_user(context, 0, /* krb5_flags options */ ccache, &in_creds, NULL, /* krb5_data *subject_cert */ out_creds); } else { in_creds.client = me; in_creds.server = server; ret = krb5_get_credentials(context, 0, ccache, &in_creds, out_creds); } return ret; } #endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */ /* * smb_krb5_get_credentials * * @brief Get krb5 credentials for a server * * @param[in] context An initialized krb5_context * @param[in] ccache An initialized krb5_ccache * @param[in] me The krb5_principal of the caller * @param[in] server The krb5_principal of the requested service * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional) * @param[out] out_creds The returned krb5_creds structure * @return krb5_error_code * */ krb5_error_code smb_krb5_get_credentials(krb5_context context, krb5_ccache ccache, krb5_principal me, krb5_principal server, krb5_principal impersonate_princ, krb5_creds **out_creds) { krb5_error_code ret; krb5_creds *creds = NULL; *out_creds = NULL; if (impersonate_princ) { #ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */ ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds); #elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */ ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds); #else ret = ENOTSUP; #endif } else { krb5_creds in_creds; ZERO_STRUCT(in_creds); in_creds.client = me; in_creds.server = server; ret = krb5_get_credentials(context, 0, ccache, &in_creds, &creds); } if (ret) { goto done; } ret = krb5_cc_store_cred(context, ccache, creds); if (ret) { goto done; } if (out_creds) { *out_creds = creds; } done: if (creds && ret) { krb5_free_creds(context, creds); } return ret; } /* * smb_krb5_get_creds * * @brief Get krb5 credentials for a server * * @param[in] server_s The string name of the service * @param[in] time_offset The offset to the KDCs time in seconds (optional) * @param[in] cc The krb5 credential cache string name (optional) * @param[in] impersonate_princ_s The string principal name to impersonate (optional) * @param[out] creds_p The returned krb5_creds structure * @return krb5_error_code * */ krb5_error_code smb_krb5_get_creds(const char *server_s, time_t time_offset, const char *cc, const char *impersonate_princ_s, krb5_creds **creds_p) { krb5_error_code ret; krb5_context context = NULL; krb5_principal me = NULL; krb5_principal server = NULL; krb5_principal impersonate_princ = NULL; krb5_creds *creds = NULL; krb5_ccache ccache = NULL; *creds_p = NULL; initialize_krb5_error_table(); ret = krb5_init_context(&context); if (ret) { goto done; } if (time_offset != 0) { krb5_set_real_time(context, time(NULL) + time_offset, 0); } ret = krb5_cc_resolve(context, cc ? cc : krb5_cc_default_name(context), &ccache); if (ret) { goto done; } ret = krb5_cc_get_principal(context, ccache, &me); if (ret) { goto done; } ret = smb_krb5_parse_name(context, server_s, &server); if (ret) { goto done; } if (impersonate_princ_s) { ret = smb_krb5_parse_name(context, impersonate_princ_s, &impersonate_princ); if (ret) { goto done; } } ret = smb_krb5_get_credentials(context, ccache, me, server, impersonate_princ, &creds); if (ret) { goto done; } ret = krb5_cc_store_cred(context, ccache, creds); if (ret) { goto done; } if (creds_p) { *creds_p = creds; } DEBUG(1,("smb_krb5_get_creds: got ticket for %s\n", server_s)); if (impersonate_princ_s) { char *client = NULL; ret = smb_krb5_unparse_name(talloc_tos(), context, creds->client, &client); if (ret) { goto done; } DEBUGADD(1,("smb_krb5_get_creds: using S4U2SELF impersonation as %s\n", client)); TALLOC_FREE(client); } done: if (!context) { return ret; } if (creds && ret) { krb5_free_creds(context, creds); } if (server) { krb5_free_principal(context, server); } if (me) { krb5_free_principal(context, me); } if (impersonate_princ) { krb5_free_principal(context, impersonate_princ); } if (ccache) { krb5_cc_close(context, ccache); } krb5_free_context(context); return ret; } /* * smb_krb5_principal_get_realm * * @brief Get realm of a principal * * @param[in] context The krb5_context * @param[in] principal The principal * @return pointer to the realm * */ char *smb_krb5_principal_get_realm(krb5_context context, krb5_principal principal) { #ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */ return krb5_principal_get_realm(context, principal); #elif defined(krb5_princ_realm) /* MIT */ krb5_data *realm; realm = krb5_princ_realm(context, principal); return (char *)realm->data; #else return NULL; #endif } #else /* HAVE_KRB5 */ /* this saves a few linking headaches */ int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx, const char *principal, time_t time_offset, DATA_BLOB *ticket, DATA_BLOB *session_key_krb5, uint32_t extra_ap_opts, const char *ccname, time_t *tgs_expire, const char *impersonate_princ_s) { DEBUG(0,("NO KERBEROS SUPPORT\n")); return 1; } bool unwrap_pac(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, DATA_BLOB *unwrapped_pac_data) { DEBUG(0,("NO KERBEROS SUPPORT\n")); return false; } #endif /* HAVE_KRB5 */