diff options
Diffstat (limited to 'source3/libsmb/clikrb5.c')
| -rw-r--r-- | source3/libsmb/clikrb5.c | 1923 |
1 files changed, 1923 insertions, 0 deletions
diff --git a/source3/libsmb/clikrb5.c b/source3/libsmb/clikrb5.c new file mode 100644 index 0000000000..b8afb57977 --- /dev/null +++ b/source3/libsmb/clikrb5.c @@ -0,0 +1,1923 @@ +/* + 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 2005-2007 + + 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/>. +*/ + +#define KRB5_PRIVATE 1 /* this file uses PRIVATE interfaces! */ +#define KRB5_DEPRECATED 1 /* this file uses DEPRECATED interfaces! */ + +#include "includes.h" + +#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 (12+GSSAPI_BNDLENGTH) + +#if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_FWD_TGT_CREDS) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) +static krb5_error_code ads_krb5_get_fwd_ticket( krb5_context context, + krb5_auth_context *auth_context, + krb5_creds *credsp, + krb5_ccache ccache, + krb5_data *authenticator); +#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_allocate(&utf8_name, name, &converted_size)) { + return ENOMEM; + } + + ret = krb5_parse_name(context, utf8_name, principal); + SAFE_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_allocate(&utf8_name, name, &converted_size)) { + return ENOMEM; + } + + ret = krb5_parse_name_norealm(context, utf8_name, principal); + SAFE_FREE(utf8_name); + return ret; +} +#endif + +/************************************************************** + krb5_parse_name that returns a UNIX charset name. Must + be freed with normal free() call. +**************************************************************/ + + krb5_error_code smb_krb5_unparse_name(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_allocate(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; + } + + 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, &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; + } + + 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, &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(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; +} + +/* + 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) +{ + krb5_error_code retval; + krb5_principal server; + krb5_creds * credsp; + krb5_creds creds; + krb5_data in_data; + bool creds_ready = False; + int i = 0, maxtries = 3; + + 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; + } + + /* 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 = krb5_get_credentials(context, 0, ccache, + &creds, &credsp))) { + DEBUG(1,("ads_krb5_mk_req: 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((unsigned)credsp->times.endtime), + (unsigned)credsp->times.endtime)); + + if (expire_time) { + *expire_time = (time_t)credsp->times.endtime; + } + +#if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_FWD_TGT_CREDS) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) + 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") ); + + if( *auth_context == NULL ) { + /* Allocate if it has not yet been allocated. */ + retval = krb5_auth_con_init( context, auth_context ); + if (retval) { + DEBUG(1,("ads_krb5_mk_req: krb5_auth_con_init failed (%s)\n", + error_message(retval))); + goto cleanup_creds; + } + } + + retval = krb5_auth_con_setuseruserkey( context, *auth_context, &credsp->keyblock ); + if (retval) { + DEBUG(1,("ads_krb5_mk_req: 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,("ads_krb5_mk_req: krb5_auth_con_setflags failed (%s)\n", + error_message(retval))); + goto cleanup_creds; + } + + retval = ads_krb5_get_fwd_ticket( context, + auth_context, + credsp, + ccache, + &in_data ); + if (retval) { + DEBUG( 3, ("ads_krb5_get_fwd_ticket 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; + } + } +#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))); + } + + 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); + + return retval; +} + +/* + get a kerberos5 ticket for the given service +*/ +int cli_krb5_get_ticket(const char *principal, time_t time_offset, + DATA_BLOB *ticket, DATA_BLOB *session_key_krb5, + uint32 extra_ap_opts, const char *ccname, + time_t *tgs_expire) + +{ + 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[] = { +#ifdef ENCTYPE_ARCFOUR_HMAC + ENCTYPE_ARCFOUR_HMAC, +#endif + ENCTYPE_DES_CBC_MD5, + ENCTYPE_DES_CBC_CRC, + ENCTYPE_NULL}; + + initialize_krb5_error_table(); + retval = krb5_init_context(&context); + if (retval) { + DEBUG(1,("cli_krb5_get_ticket: 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,("cli_krb5_get_ticket: krb5_cc_default failed (%s)\n", + error_message(retval))); + goto failed; + } + + if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) { + DEBUG(1,("cli_krb5_get_ticket: krb5_set_default_tgs_ktypes failed (%s)\n", + error_message(retval))); + goto failed; + } + + if ((retval = ads_krb5_mk_req(context, + &auth_context, + AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts, + principal, + ccdef, &packet, + tgs_expire))) { + goto failed; + } + + get_krb5_smb_session_key(context, auth_context, session_key_krb5, False); + + *ticket = data_blob(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(krb5_context context, krb5_auth_context auth_context, DATA_BLOB *session_key, bool remote) + { + krb5_keyblock *skey; + krb5_error_code err; + 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 == 0 && skey != NULL) { + DEBUG(10, ("Got KRB5 session key of length %d\n", (int)KRB5_KEY_LENGTH(skey))); + *session_key = data_blob(KRB5_KEY_DATA(skey), KRB5_KEY_LENGTH(skey)); + dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length); + + ret = True; + + krb5_free_keyblock(context, skey); + } else { + DEBUG(10, ("KRB5 error getting session key %d\n", err)); + } + + 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) +{ +#if defined(HAVE_KRB5_KT_FREE_ENTRY) + return krb5_kt_free_entry(context, kt_entry); +#elif defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS) + return krb5_free_keytab_entry_contents(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(context, server, &name) == 0) { + DEBUG(10,("get_key_from_keytab: will look for kvno %d, enctype %d and name: %s\n", + kvno, enctype, name)); + SAFE_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) { + ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error; + 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 (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(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_FWD_TGT_CREDS) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) +/************************************************************** +Routine: ads_krb5_get_fwd_ticket + Description: + When a service ticket is flagged as trusted + for delegation we should provide a forwardable + ticket so that the remote host can act on our + behalf. This is done by taking the 2nd forwardable + TGT and storing it in the GSS-API authenticator + "checksum". This routine will populate + the krb5_data authenticator with this TGT. + Parameters: + krb5_context context: The kerberos context for this authentication. + krb5_auth_context: The authentication context. + krb5_creds *credsp: The ticket credentials (AS-REP). + krb5_ccache ccache: The credentials cache. + krb5_data &authenticator: The checksum field that will store the TGT, and + authenticator.data must be freed by the caller. + + Returns: + krb5_error_code: 0 if no errors, otherwise set. +**************************************************************/ + +static krb5_error_code ads_krb5_get_fwd_ticket( krb5_context context, + krb5_auth_context *auth_context, + krb5_creds *credsp, + krb5_ccache ccache, + krb5_data *authenticator) +{ + krb5_data fwdData; + krb5_error_code retval = 0; + char *pChksum = NULL; + char *p = NULL; + + ZERO_STRUCT(fwdData); + ZERO_STRUCTP(authenticator); + + 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] */ + &fwdData ); /* Resulting response [out] */ + + + if (retval) { + DEBUG(1,("ads_krb5_get_fwd_ticket: krb5_fwd_tgt_creds failed (%s)\n", + error_message(retval))); + goto out; + } + + if ((unsigned int)GSSAPI_CHECKSUM_SIZE + (unsigned int)fwdData.length < + (unsigned int)GSSAPI_CHECKSUM_SIZE) { + retval = EINVAL; + goto out; + } + + /* We're going to allocate a gssChecksum structure with a little + extra data the length of the kerberos credentials length + (APPLICATION 22) so that we can pack it on the end of the structure. + */ + + pChksum = (char *)SMB_MALLOC(GSSAPI_CHECKSUM_SIZE + fwdData.length ); + if (!pChksum) { + retval = ENOMEM; + goto out; + } + + p = pChksum; + + SIVAL(p, 0, GSSAPI_BNDLENGTH); + p += 4; + + /* Zero out the bindings fields */ + memset(p, '\0', GSSAPI_BNDLENGTH ); + p += GSSAPI_BNDLENGTH; + + SIVAL(p, 0, GSS_C_DELEG_FLAG ); + p += 4; + SSVAL(p, 0, 1 ); + p += 2; + SSVAL(p, 0, fwdData.length ); + p += 2; + + /* Migrate the kerberos KRB_CRED data to the checksum delegation */ + memcpy(p, fwdData.data, fwdData.length ); + p += fwdData.length; + + /* We need to do this in order to allow our GSS-API */ + retval = krb5_auth_con_set_req_cksumtype( context, *auth_context, GSSAPI_CHECKSUM ); + if (retval) { + goto out; + } + + /* We now have a service ticket, now turn it into an AP-REQ. */ + authenticator->length = fwdData.length + GSSAPI_CHECKSUM_SIZE; + + /* Caller should call free() when they're done with this. */ + authenticator->data = (char *)pChksum; + + out: + + /* Remove that input data, we never needed it anyway. */ + if (fwdData.length > 0) { + krb5_free_data_contents( context, &fwdData ); + } + + return retval; +} +#endif + +#else /* HAVE_KRB5 */ + /* this saves a few linking headaches */ + int cli_krb5_get_ticket(const char *principal, time_t time_offset, + DATA_BLOB *ticket, DATA_BLOB *session_key_krb5, uint32 extra_ap_opts, + const char *ccname, time_t *tgs_expire) +{ + DEBUG(0,("NO KERBEROS SUPPORT\n")); + return 1; +} + +#endif |