From 7cabdeb7ec84c7c0b3e9b907e19f4e240b7fc4ca Mon Sep 17 00:00:00 2001 From: Andrew Bartlett Date: Tue, 29 Mar 2005 08:24:03 +0000 Subject: r6113: Move GENSEC and the kerberos code out of libcli/auth, and into auth/gensec and auth/kerberos. This also pulls the kerberos configure code out of libads (which is otherwise dead), and into auth/kerberos/kerberos.m4 Andrew Bartlett (This used to be commit e074d63f3dcf4f84239a10879112ebaf1cfa6c4f) --- source4/auth/kerberos/clikrb5.c | 478 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 478 insertions(+) create mode 100644 source4/auth/kerberos/clikrb5.c (limited to 'source4/auth/kerberos/clikrb5.c') diff --git a/source4/auth/kerberos/clikrb5.c b/source4/auth/kerberos/clikrb5.c new file mode 100644 index 0000000000..ec8f60fbb3 --- /dev/null +++ b/source4/auth/kerberos/clikrb5.c @@ -0,0 +1,478 @@ +/* + Unix SMB/CIFS implementation. + simple kerberos5 routines for active directory + Copyright (C) Andrew Tridgell 2001 + Copyright (C) Luke Howard 2002-2003 + + 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 2 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, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. +*/ + +#include "includes.h" +#include "system/network.h" +#include "system/kerberos.h" +#include "system/time.h" +#include "auth/kerberos/kerberos.h" + +#ifdef HAVE_KRB5 + +#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_IN_TKT_ETYPES) && !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES) + 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 + +#if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) +/* HEIMDAL */ + void setup_kaddr( krb5_address *pkaddr, struct sockaddr *paddr) +{ + 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); +} +#elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) +/* MIT */ + void setup_kaddr( krb5_address *pkaddr, struct sockaddr *paddr) +{ + pkaddr->addrtype = ADDRTYPE_INET; + pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr); + pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr); +} +#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) + 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_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) + 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; + } + return krb5_string_to_key_salt(context, enctype, password->data, + salt, key); +} +#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) +{ + 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. + */ + 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 + + void free_kerberos_etypes(krb5_context context, + krb5_enctype *enctypes) +{ +#if defined(HAVE_KRB5_FREE_KTYPES) + krb5_free_ktypes(context, enctypes); + return; +#else + SAFE_FREE(enctypes); + return; +#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 + + DATA_BLOB get_auth_data_from_tkt(TALLOC_CTX *mem_ctx, + krb5_ticket *tkt) +{ + DATA_BLOB auth_data = data_blob(NULL, 0); +#if defined(HAVE_KRB5_TKT_ENC_PART2) + if (tkt && tkt->enc_part2 + && tkt->enc_part2->authorization_data + && tkt->enc_part2->authorization_data[0] + && tkt->enc_part2->authorization_data[0]->length) + auth_data = data_blob(tkt->enc_part2->authorization_data[0]->contents, + tkt->enc_part2->authorization_data[0]->length); +#else + if (tkt && tkt->ticket.authorization_data && tkt->ticket.authorization_data->len) + auth_data = data_blob(tkt->ticket.authorization_data->val->ad_data.data, + tkt->ticket.authorization_data->val->ad_data.length); +#endif + return auth_data; +} + + 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_error_code 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, ("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, ("krb5_locate_kdc: zero kdcs found !\n")); + krb5_krbhst_free(ctx, hnd); + return -1; + } + + sa = malloc_array_p(struct sockaddr, num_kdcs); + if (!sa) { + DEBUG(0, ("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; +} +#endif + +#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; + TALLOC_CTX *mem_ctx = talloc_init("ticket expied time"); + if (!mem_ctx) { + return False; + } + + DEBUG(3, ("Ticket in ccache[%s] expiration %s\n", + krb5_cc_default_name(context), + http_timestring(mem_ctx, credsp->times.endtime))); + + talloc_free(mem_ctx); + + /* 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 (StrCaseCmp(krb5_cc_get_type(context, ccache), "FILE") == 0) { + DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a FILE ccache\n")); + 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 +*/ +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) +{ + krb5_error_code retval; + krb5_principal server; + krb5_creds * credsp; + krb5_creds creds; + krb5_data in_data; + BOOL creds_ready = False; + + TALLOC_CTX *mem_ctx = NULL; + + retval = 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,("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) { + 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 =(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; + } + + mem_ctx = talloc_init("ticket expied time"); + if (!mem_ctx) { + retval = ENOMEM; + goto cleanup_creds; + } + DEBUG(10,("Ticket (%s) in ccache (%s) is valid until: (%s - %d)\n", + principal, krb5_cc_default_name(context), + http_timestring(mem_ctx, (unsigned)credsp->times.endtime), + (unsigned)credsp->times.endtime)); + + in_data.length = 0; + 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))); + } + + krb5_free_creds(context, credsp); + +cleanup_creds: + krb5_free_cred_contents(context, &creds); + +cleanup_princ: + krb5_free_principal(context, server); + + return retval; +} + +#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 ) +{ + static krb5_data kdata; + + kdata.data = discard_const(krb5_principal_get_comp_string(context, principal, i)); + kdata.length = strlen(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 +} + + char *smb_get_krb5_error_message(krb5_context context, krb5_error_code code, TALLOC_CTX *mem_ctx) +{ + char *ret; + +#if defined(HAVE_KRB5_GET_ERROR_STRING) && defined(HAVE_KRB5_FREE_ERROR_STRING) + char *context_error = krb5_get_error_string(context); + ret = talloc_asprintf(mem_ctx, "%s: %s", error_message(code), context_error); + krb5_free_error_string(context, context_error); +#else + ret = talloc_strdup(mem_ctx, error_message(code)); +#endif + return ret; +} + +#endif -- cgit