From 08c733d75fd83fd5e32ced9712d41dd595e0f182 Mon Sep 17 00:00:00 2001 From: Simo Sorce Date: Sat, 21 Apr 2012 17:26:18 -0400 Subject: Make krb5 wrapper library common so they can be used all over --- lib/krb5_wrap/krb5_samba.c | 1754 +++++++++++++++++++++++++++++++++++++++++++ lib/krb5_wrap/krb5_samba.h | 215 ++++++ lib/krb5_wrap/wscript_build | 7 + 3 files changed, 1976 insertions(+) create mode 100644 lib/krb5_wrap/krb5_samba.c create mode 100644 lib/krb5_wrap/krb5_samba.h create mode 100755 lib/krb5_wrap/wscript_build (limited to 'lib/krb5_wrap') diff --git a/lib/krb5_wrap/krb5_samba.c b/lib/krb5_wrap/krb5_samba.c new file mode 100644 index 0000000000..4e555b2853 --- /dev/null +++ b/lib/krb5_wrap/krb5_samba.c @@ -0,0 +1,1754 @@ +/* + 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 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 . +*/ + +#include "includes.h" +#include "krb5_samba.h" +#include "librpc/gen_ndr/krb5pac.h" +#include "lib/util/asn1.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 + +#if !defined(SMB_MALLOC) +#undef malloc +#define SMB_MALLOC(s) malloc((s)) +#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_C_STRING_TO_KEY) +/* MIT */ +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; + + ret = krb5_principal2salt(context, host_princ, &salt); + if (ret) { + DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret))); + return ret; + } + ret = krb5_c_string_to_key(context, enctype, password, &salt, key); + SAFE_FREE(salt.data); + + return ret; +} +#elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT) +/* Heimdal */ +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 + +#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) +{ +#ifdef HAVE_KRB5_PDU_NONE_DECL + return krb5_get_default_in_tkt_etypes(context, KRB5_PDU_NONE, enctypes); +#else + return krb5_get_default_in_tkt_etypes(context, enctypes); +#endif +} +#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; +} + + +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; +} + +#if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE) +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; +} +#endif + +/************************************************************** + 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; + TALLOC_CTX *frame = talloc_stackframe(); + + if (!push_utf8_talloc(frame, &utf8_name, name, &converted_size)) { + talloc_free(frame); + return ENOMEM; + } + + ret = krb5_parse_name(context, utf8_name, principal); + TALLOC_FREE(frame); + return ret; +} + +#if !defined(HAVE_KRB5_FREE_UNPARSED_NAME) +void krb5_free_unparsed_name(krb5_context context, char *val) +{ + SAFE_FREE(val); +} +#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; +} + +krb5_error_code smb_krb5_parse_name_norealm(krb5_context context, + const char *name, + krb5_principal *principal) +{ + /* 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) +{ + return krb5_principal_compare_any_realm(context, princ1, princ2); +} + +/* + 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; + + 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_AUTH_CON_SETUSERUSERKEY) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE) + { + uint32_t gss_flags = 0; + + 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] */ + discard_const_p(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))); + } + +#if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE) +cleanup_data: +#endif + + 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; +} + +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); + } +#elif defined(HAVE_KRB5_DATA_FREE) + krb5_data_free(context, pdata); +#else + SAFE_FREE(pdata->data); +#endif +} + +/* + 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 = discard_const_p(char, krb5_principal_get_comp_string(context, principal, i)); + kdata.length = strlen((const char *)kdata.data); + return &kdata; +} +#endif + +/* Prototypes */ + + 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, discard_const_p(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; + } + } + + ret = krb5_get_renewed_creds(context, &creds, client, ccache, discard_const_p(char, service_string)); + if (ret) { + DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret))); + goto done; + } + + /* 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; +} + +#define MAX_NETBIOSNAME_LEN 16 + krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr, + const char *netbios_name) +{ + krb5_error_code ret = 0; + char buf[MAX_NETBIOSNAME_LEN]; + int len; +#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; + } + + /* temporarily duplicate put_name() code here to avoid dependency + * issues for a 5 lines function */ + len = strlen(netbios_name); + memcpy(buf, netbios_name, + (len < MAX_NETBIOSNAME_LEN) ? len : MAX_NETBIOSNAME_LEN - 1); + if (len < MAX_NETBIOSNAME_LEN - 1) { + memset(buf + len, ' ', MAX_NETBIOSNAME_LEN - 1 - len); + } + buf[MAX_NETBIOSNAME_LEN - 1] = 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) +{ + /* Heimdal or modern MIT version */ + return krb5_get_init_creds_opt_alloc(context, opt); +} + +void smb_krb5_get_init_creds_opt_free(krb5_context context, + krb5_get_init_creds_opt *opt) +{ + /* Modern MIT or Heimdal version */ + krb5_get_init_creds_opt_free(context, opt); +} + +krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry) +{ + return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry)); +} + +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 +} + + +/* 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 +} + +/********************************************************************** + * 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; + } + + 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 discard_const_p(char, krb5_principal_get_realm(context, principal)); +#elif defined(krb5_princ_realm) /* MIT */ + krb5_data *realm; + realm = krb5_princ_realm(context, principal); + return discard_const_p(char, realm->data); +#else + return NULL; +#endif +} + +/************************************************************************ + Routine to get the default realm from the kerberos credentials cache. + Caller must free if the return value is not NULL. +************************************************************************/ + +static char *smb_krb5_get_default_realm_from_ccache(TALLOC_CTX *mem_ctx) +{ + char *realm = NULL; + krb5_context ctx = NULL; + krb5_ccache cc = NULL; + krb5_principal princ = NULL; + + initialize_krb5_error_table(); + if (krb5_init_context(&ctx)) { + return NULL; + } + + DEBUG(5,("kerberos_get_default_realm_from_ccache: " + "Trying to read krb5 cache: %s\n", + krb5_cc_default_name(ctx))); + if (krb5_cc_default(ctx, &cc)) { + DEBUG(0,("kerberos_get_default_realm_from_ccache: " + "failed to read default cache\n")); + goto out; + } + if (krb5_cc_get_principal(ctx, cc, &princ)) { + DEBUG(0,("kerberos_get_default_realm_from_ccache: " + "failed to get default principal\n")); + goto out; + } + +#if defined(HAVE_KRB5_PRINCIPAL_GET_REALM) + realm = talloc_strdup(mem_ctx, krb5_principal_get_realm(ctx, princ)); +#elif defined(HAVE_KRB5_PRINC_REALM) + { + krb5_data *realm_data = krb5_princ_realm(ctx, princ); + realm = talloc_strndup(mem_ctx, realm_data->data, realm_data->length); + } +#endif + + out: + + if (ctx) { + if (princ) { + krb5_free_principal(ctx, princ); + } + if (cc) { + krb5_cc_close(ctx, cc); + } + krb5_free_context(ctx); + } + + return realm; +} + +/************************************************************************ + Routine to get the realm from a given DNS name. +************************************************************************/ + +static char *smb_krb5_get_realm_from_hostname(TALLOC_CTX *mem_ctx, + const char *hostname) +{ +#if defined(HAVE_KRB5_REALM_TYPE) + /* Heimdal. */ + krb5_realm *realm_list = NULL; +#else + /* MIT */ + char **realm_list = NULL; +#endif + char *realm = NULL; + krb5_error_code kerr; + krb5_context ctx = NULL; + + initialize_krb5_error_table(); + if (krb5_init_context(&ctx)) { + return NULL; + } + + kerr = krb5_get_host_realm(ctx, hostname, &realm_list); + if (kerr != 0) { + DEBUG(3,("kerberos_get_realm_from_hostname %s: " + "failed %s\n", + hostname ? hostname : "(NULL)", + error_message(kerr) )); + goto out; + } + + if (realm_list && realm_list[0]) { + realm = talloc_strdup(mem_ctx, realm_list[0]); + } + + out: + + if (ctx) { + if (realm_list) { + krb5_free_host_realm(ctx, realm_list); + realm_list = NULL; + } + krb5_free_context(ctx); + ctx = NULL; + } + return realm; +} + +char *kerberos_get_principal_from_service_hostname(TALLOC_CTX *mem_ctx, + const char *service, + const char *remote_name, + const char *default_realm) +{ + char *realm = NULL; + char *host = NULL; + char *principal; + host = strchr_m(remote_name, '.'); + if (host) { + /* DNS name. */ + realm = smb_krb5_get_realm_from_hostname(talloc_tos(), + remote_name); + } else { + /* NetBIOS name - use our realm. */ + realm = smb_krb5_get_default_realm_from_ccache(talloc_tos()); + } + + if (realm == NULL || *realm == '\0') { + realm = talloc_strdup(talloc_tos(), default_realm); + if (!realm) { + return NULL; + } + DEBUG(3,("kerberos_get_principal_from_service_hostname: " + "cannot get realm from, " + "desthost %s or default ccache. Using default " + "smb.conf realm %s\n", + remote_name, + realm)); + } + + principal = talloc_asprintf(mem_ctx, + "%s/%s@%s", + service, remote_name, + realm); + TALLOC_FREE(realm); + return principal; +} + +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_MESSAGE) && defined(HAVE_KRB5_FREE_ERROR_MESSAGE) + const char *context_error = krb5_get_error_message(context, code); + if (context_error) { + ret = talloc_asprintf(mem_ctx, "%s: %s", + error_message(code), context_error); + krb5_free_error_message(context, context_error); + return ret; + } +#endif + ret = talloc_strdup(mem_ctx, error_message(code)); + return ret; +} + +#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; +} + +#endif /* HAVE_KRB5 */ diff --git a/lib/krb5_wrap/krb5_samba.h b/lib/krb5_wrap/krb5_samba.h new file mode 100644 index 0000000000..3800b024ad --- /dev/null +++ b/lib/krb5_wrap/krb5_samba.h @@ -0,0 +1,215 @@ +/* + 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 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 . +*/ + +#ifndef _KRB5_SAMBA_H +#define _KRB5_SAMBA_H + +#ifdef HAVE_KRB5 + +#define KRB5_PRIVATE 1 /* this file uses PRIVATE interfaces! */ +/* this file uses DEPRECATED interfaces! */ + +#if defined(HAVE_KRB5_DEPRECATED_WITH_IDENTIFIER) +#define KRB5_DEPRECATED 1 +#else +#define KRB5_DEPRECATED +#endif + +#include "system/kerberos.h" +#include "system/network.h" + +#ifndef KRB5_ADDR_NETBIOS +#define KRB5_ADDR_NETBIOS 0x14 +#endif + +#ifndef KRB5KRB_ERR_RESPONSE_TOO_BIG +#define KRB5KRB_ERR_RESPONSE_TOO_BIG (-1765328332L) +#endif + +/* Heimdal uses a slightly different name */ +#if defined(HAVE_ENCTYPE_ARCFOUR_HMAC_MD5) && !defined(HAVE_ENCTYPE_ARCFOUR_HMAC) +#define ENCTYPE_ARCFOUR_HMAC ENCTYPE_ARCFOUR_HMAC_MD5 +#endif + +/* The older versions of heimdal that don't have this + define don't seem to use it anyway. I'm told they + always use a subkey */ +#ifndef HAVE_AP_OPTS_USE_SUBKEY +#define AP_OPTS_USE_SUBKEY 0 +#endif + +typedef struct { +#if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */ + krb5_address **addrs; +#elif defined(HAVE_KRB5_ADDRESSES) /* Heimdal */ + krb5_addresses *addrs; +#else +#error UNKNOWN_KRB5_ADDRESS_TYPE +#endif /* defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) */ +} smb_krb5_addresses; + +#ifdef HAVE_KRB5_KEYTAB_ENTRY_KEY /* MIT */ +#define KRB5_KT_KEY(k) (&(k)->key) +#elif HAVE_KRB5_KEYTAB_ENTRY_KEYBLOCK /* Heimdal */ +#define KRB5_KT_KEY(k) (&(k)->keyblock) +#else +#error krb5_keytab_entry has no key or keyblock member +#endif /* HAVE_KRB5_KEYTAB_ENTRY_KEY */ + +/* work around broken krb5.h on sles9 */ +#ifdef SIZEOF_LONG +#undef SIZEOF_LONG +#endif + +#ifdef HAVE_KRB5_KEYBLOCK_KEYVALUE /* Heimdal */ +#define KRB5_KEY_TYPE(k) ((k)->keytype) +#define KRB5_KEY_LENGTH(k) ((k)->keyvalue.length) +#define KRB5_KEY_DATA(k) ((k)->keyvalue.data) +#define KRB5_KEY_DATA_CAST void +#else /* MIT */ +#define KRB5_KEY_TYPE(k) ((k)->enctype) +#define KRB5_KEY_LENGTH(k) ((k)->length) +#define KRB5_KEY_DATA(k) ((k)->contents) +#define KRB5_KEY_DATA_CAST krb5_octet +#endif /* HAVE_KRB5_KEYBLOCK_KEYVALUE */ + +krb5_error_code smb_krb5_parse_name(krb5_context context, + const char *name, /* in unix charset */ + krb5_principal *principal); + +krb5_error_code smb_krb5_unparse_name(TALLOC_CTX *mem_ctx, + krb5_context context, + krb5_const_principal principal, + char **unix_name); + +krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc); + +#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); +#endif + +#ifndef HAVE_KRB5_FREE_UNPARSED_NAME +void krb5_free_unparsed_name(krb5_context ctx, char *val); +#endif + +/* Stub out initialize_krb5_error_table since it is not present in all + * Kerberos implementations. If it's not present, it's not necessary to + * call it. + */ +#ifndef HAVE_INITIALIZE_KRB5_ERROR_TABLE +#define initialize_krb5_error_table() +#endif + +/* Samba wrapper functions for krb5 functionality. */ +bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr); +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); +int create_kerberos_key_from_string_direct(krb5_context context, + krb5_principal host_princ, + krb5_data *password, + krb5_keyblock *key, + krb5_enctype enctype); + +krb5_error_code get_kerberos_allowed_etypes(krb5_context context, krb5_enctype **enctypes); +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_error_code smb_krb5_kt_free_entry(krb5_context context, krb5_keytab_entry *kt_entry); +void kerberos_set_creds_enctype(krb5_creds *pcreds, int enctype); +bool kerberos_compatible_enctypes(krb5_context context, krb5_enctype enctype1, krb5_enctype enctype2); +void kerberos_free_data_contents(krb5_context context, krb5_data *pdata); +krb5_error_code smb_krb5_parse_name_norealm(krb5_context context, + const char *name, + krb5_principal *principal); +bool smb_krb5_principal_compare_any_realm(krb5_context context, + krb5_const_principal princ1, + krb5_const_principal princ2); +krb5_error_code smb_krb5_renew_ticket(const char *ccache_string, const char *client_string, const char *service_string, time_t *expire_time); +krb5_error_code kpasswd_err_to_krb5_err(krb5_error_code res_code); +krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr, + const char *netbios_name); +krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr); +NTSTATUS krb5_to_nt_status(krb5_error_code kerberos_error); +krb5_error_code nt_status_to_krb5(NTSTATUS nt_status); +void smb_krb5_free_error(krb5_context context, krb5_error *krberror); +krb5_error_code handle_krberror_packet(krb5_context context, + krb5_data *packet); + +void smb_krb5_get_init_creds_opt_free(krb5_context context, + krb5_get_init_creds_opt *opt); +krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context, + krb5_get_init_creds_opt **opt); +krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry); +krb5_error_code smb_krb5_enctype_to_string(krb5_context context, + krb5_enctype enctype, + char **etype_s); +krb5_error_code smb_krb5_open_keytab(krb5_context context, + const char *keytab_name, + bool write_access, + krb5_keytab *keytab); +krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx, + krb5_context context, + krb5_keytab keytab, + const char **keytab_name); +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 smb_krb5_get_creds(const char *server_s, + time_t time_offset, + const char *cc, + const char *impersonate_princ_s, + krb5_creds **creds_p); +char *smb_krb5_principal_get_realm(krb5_context context, + krb5_principal principal); + +char *kerberos_get_principal_from_service_hostname(TALLOC_CTX *mem_ctx, + const char *service, + const char *remote_name, + const char *default_realm); + +char *smb_get_krb5_error_message(krb5_context context, + krb5_error_code code, + TALLOC_CTX *mem_ctx); + +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); + +bool unwrap_edata_ntstatus(TALLOC_CTX *mem_ctx, + DATA_BLOB *edata, + DATA_BLOB *edata_out); + +#endif /* HAVE_KRB5 */ + + +#endif /* _KRB5_SAMBA_H */ diff --git a/lib/krb5_wrap/wscript_build b/lib/krb5_wrap/wscript_build new file mode 100755 index 0000000000..c585819834 --- /dev/null +++ b/lib/krb5_wrap/wscript_build @@ -0,0 +1,7 @@ +#!/usr/bin/env python + +bld.SAMBA_LIBRARY('krb5samba', + source='krb5_samba.c', + deps='samba-util asn1util talloc krb5 com_err', + private_library=True + ) -- cgit