diff options
Diffstat (limited to 'libcli')
| -rw-r--r-- | libcli/auth/kerberos_pac.c | 364 | ||||
| -rw-r--r-- | libcli/auth/wscript_build | 2 |
2 files changed, 1 insertions, 365 deletions
diff --git a/libcli/auth/kerberos_pac.c b/libcli/auth/kerberos_pac.c deleted file mode 100644 index 79d51b2645..0000000000 --- a/libcli/auth/kerberos_pac.c +++ /dev/null @@ -1,364 +0,0 @@ -/* - Unix SMB/CIFS implementation. - kerberos authorization data (PAC) utility library - Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2003 - Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005 - Copyright (C) Andrew Tridgell 2001 - Copyright (C) Luke Howard 2002-2003 - Copyright (C) Stefan Metzmacher 2004-2005 - Copyright (C) Guenther Deschner 2005,2007,2008 - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 3 of the License, or - (at your option) any later version. - - This program is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program. If not, see <http://www.gnu.org/licenses/>. -*/ - -#include "includes.h" -#ifdef HAVE_KRB5 - -#include "librpc/gen_ndr/ndr_krb5pac.h" -#include "libcli/auth/krb5_wrap.h" - -krb5_error_code check_pac_checksum(TALLOC_CTX *mem_ctx, - DATA_BLOB pac_data, - struct PAC_SIGNATURE_DATA *sig, - krb5_context context, - const krb5_keyblock *keyblock) -{ - krb5_error_code ret; - krb5_checksum cksum; - krb5_keyusage usage = 0; - - smb_krb5_checksum_from_pac_sig(&cksum, sig); - -#ifdef HAVE_KRB5_KU_OTHER_CKSUM /* Heimdal */ - usage = KRB5_KU_OTHER_CKSUM; -#elif defined(HAVE_KRB5_KEYUSAGE_APP_DATA_CKSUM) /* MIT */ - usage = KRB5_KEYUSAGE_APP_DATA_CKSUM; -#else -#error UNKNOWN_KRB5_KEYUSAGE -#endif - - ret = smb_krb5_verify_checksum(context, - keyblock, - usage, - &cksum, - pac_data.data, - pac_data.length); - - if (ret) { - DEBUG(2,("check_pac_checksum: PAC Verification failed: %s (%d)\n", - error_message(ret), ret)); - return ret; - } - - return ret; -} - -/** -* @brief Decode a blob containing a NDR envoded PAC structure -* -* @param mem_ctx - The memory context -* @param pac_data_blob - The data blob containing the NDR encoded data -* @param context - The Kerberos Context -* @param service_keyblock - The Service Key used to verify the checksum -* @param client_principal - The client principal -* @param tgs_authtime - The ticket timestamp -* @param pac_data_out - [out] The decoded PAC -* -* @return - A NTSTATUS error code -*/ -NTSTATUS kerberos_decode_pac(TALLOC_CTX *mem_ctx, - DATA_BLOB pac_data_blob, - krb5_context context, - const krb5_keyblock *krbtgt_keyblock, - const krb5_keyblock *service_keyblock, - krb5_const_principal client_principal, - time_t tgs_authtime, - struct PAC_DATA **pac_data_out) -{ - NTSTATUS status; - enum ndr_err_code ndr_err; - krb5_error_code ret; - DATA_BLOB modified_pac_blob; - - NTTIME tgs_authtime_nttime; - krb5_principal client_principal_pac = NULL; - int i; - - struct PAC_SIGNATURE_DATA *srv_sig_ptr = NULL; - struct PAC_SIGNATURE_DATA *kdc_sig_ptr = NULL; - struct PAC_SIGNATURE_DATA *srv_sig_wipe = NULL; - struct PAC_SIGNATURE_DATA *kdc_sig_wipe = NULL; - struct PAC_LOGON_NAME *logon_name = NULL; - struct PAC_LOGON_INFO *logon_info = NULL; - struct PAC_DATA *pac_data = NULL; - struct PAC_DATA_RAW *pac_data_raw = NULL; - - DATA_BLOB *srv_sig_blob = NULL; - DATA_BLOB *kdc_sig_blob = NULL; - - bool bool_ret; - - *pac_data_out = NULL; - - pac_data = talloc(mem_ctx, struct PAC_DATA); - pac_data_raw = talloc(mem_ctx, struct PAC_DATA_RAW); - kdc_sig_wipe = talloc(mem_ctx, struct PAC_SIGNATURE_DATA); - srv_sig_wipe = talloc(mem_ctx, struct PAC_SIGNATURE_DATA); - if (!pac_data_raw || !pac_data || !kdc_sig_wipe || !srv_sig_wipe) { - return NT_STATUS_NO_MEMORY; - } - - ndr_err = ndr_pull_struct_blob(&pac_data_blob, pac_data, pac_data, - (ndr_pull_flags_fn_t)ndr_pull_PAC_DATA); - if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) { - status = ndr_map_error2ntstatus(ndr_err); - DEBUG(0,("can't parse the PAC: %s\n", - nt_errstr(status))); - return status; - } - - if (pac_data->num_buffers < 4) { - /* we need logon_ingo, service_key and kdc_key */ - DEBUG(0,("less than 4 PAC buffers\n")); - return NT_STATUS_INVALID_PARAMETER; - } - - ndr_err = ndr_pull_struct_blob( - &pac_data_blob, pac_data_raw, pac_data_raw, - (ndr_pull_flags_fn_t)ndr_pull_PAC_DATA_RAW); - if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) { - status = ndr_map_error2ntstatus(ndr_err); - DEBUG(0,("can't parse the PAC: %s\n", - nt_errstr(status))); - return status; - } - - if (pac_data_raw->num_buffers < 4) { - /* we need logon_ingo, service_key and kdc_key */ - DEBUG(0,("less than 4 PAC buffers\n")); - return NT_STATUS_INVALID_PARAMETER; - } - - if (pac_data->num_buffers != pac_data_raw->num_buffers) { - /* we need logon_ingo, service_key and kdc_key */ - DEBUG(0, ("misparse! PAC_DATA has %d buffers while " - "PAC_DATA_RAW has %d\n", pac_data->num_buffers, - pac_data_raw->num_buffers)); - return NT_STATUS_INVALID_PARAMETER; - } - - for (i=0; i < pac_data->num_buffers; i++) { - struct PAC_BUFFER *data_buf = &pac_data->buffers[i]; - struct PAC_BUFFER_RAW *raw_buf = &pac_data_raw->buffers[i]; - - if (data_buf->type != raw_buf->type) { - DEBUG(0, ("misparse! PAC_DATA buffer %d has type " - "%d while PAC_DATA_RAW has %d\n", i, - data_buf->type, raw_buf->type)); - return NT_STATUS_INVALID_PARAMETER; - } - switch (data_buf->type) { - case PAC_TYPE_LOGON_INFO: - if (!data_buf->info) { - break; - } - logon_info = data_buf->info->logon_info.info; - break; - case PAC_TYPE_SRV_CHECKSUM: - if (!data_buf->info) { - break; - } - srv_sig_ptr = &data_buf->info->srv_cksum; - srv_sig_blob = &raw_buf->info->remaining; - break; - case PAC_TYPE_KDC_CHECKSUM: - if (!data_buf->info) { - break; - } - kdc_sig_ptr = &data_buf->info->kdc_cksum; - kdc_sig_blob = &raw_buf->info->remaining; - break; - case PAC_TYPE_LOGON_NAME: - logon_name = &data_buf->info->logon_name; - break; - default: - break; - } - } - - if (!logon_info) { - DEBUG(0,("PAC no logon_info\n")); - return NT_STATUS_INVALID_PARAMETER; - } - - if (!logon_name) { - DEBUG(0,("PAC no logon_name\n")); - return NT_STATUS_INVALID_PARAMETER; - } - - if (!srv_sig_ptr || !srv_sig_blob) { - DEBUG(0,("PAC no srv_key\n")); - return NT_STATUS_INVALID_PARAMETER; - } - - if (!kdc_sig_ptr || !kdc_sig_blob) { - DEBUG(0,("PAC no kdc_key\n")); - return NT_STATUS_INVALID_PARAMETER; - } - - /* Find and zero out the signatures, - * as required by the signing algorithm */ - - /* We find the data blobs above, - * now we parse them to get at the exact portion we should zero */ - ndr_err = ndr_pull_struct_blob( - kdc_sig_blob, kdc_sig_wipe, kdc_sig_wipe, - (ndr_pull_flags_fn_t)ndr_pull_PAC_SIGNATURE_DATA); - if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) { - status = ndr_map_error2ntstatus(ndr_err); - DEBUG(0,("can't parse the KDC signature: %s\n", - nt_errstr(status))); - return status; - } - - ndr_err = ndr_pull_struct_blob( - srv_sig_blob, srv_sig_wipe, srv_sig_wipe, - (ndr_pull_flags_fn_t)ndr_pull_PAC_SIGNATURE_DATA); - if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) { - status = ndr_map_error2ntstatus(ndr_err); - DEBUG(0,("can't parse the SRV signature: %s\n", - nt_errstr(status))); - return status; - } - - /* Now zero the decoded structure */ - memset(kdc_sig_wipe->signature.data, - '\0', kdc_sig_wipe->signature.length); - memset(srv_sig_wipe->signature.data, - '\0', srv_sig_wipe->signature.length); - - /* and reencode, back into the same place it came from */ - ndr_err = ndr_push_struct_blob( - kdc_sig_blob, pac_data_raw, kdc_sig_wipe, - (ndr_push_flags_fn_t)ndr_push_PAC_SIGNATURE_DATA); - if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) { - status = ndr_map_error2ntstatus(ndr_err); - DEBUG(0,("can't repack the KDC signature: %s\n", - nt_errstr(status))); - return status; - } - ndr_err = ndr_push_struct_blob( - srv_sig_blob, pac_data_raw, srv_sig_wipe, - (ndr_push_flags_fn_t)ndr_push_PAC_SIGNATURE_DATA); - if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) { - status = ndr_map_error2ntstatus(ndr_err); - DEBUG(0,("can't repack the SRV signature: %s\n", - nt_errstr(status))); - return status; - } - - /* push out the whole structure, but now with zero'ed signatures */ - ndr_err = ndr_push_struct_blob( - &modified_pac_blob, pac_data_raw, pac_data_raw, - (ndr_push_flags_fn_t)ndr_push_PAC_DATA_RAW); - if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) { - status = ndr_map_error2ntstatus(ndr_err); - DEBUG(0,("can't repack the RAW PAC: %s\n", - nt_errstr(status))); - return status; - } - - if (service_keyblock) { - /* verify by service_key */ - ret = check_pac_checksum(mem_ctx, - modified_pac_blob, srv_sig_ptr, - context, - service_keyblock); - if (ret) { - DEBUG(1, ("PAC Decode: Failed to verify the service " - "signature: %s\n", error_message(ret))); - return NT_STATUS_ACCESS_DENIED; - } - - if (krbtgt_keyblock) { - /* verify the service key checksum by krbtgt_key */ - ret = check_pac_checksum(mem_ctx, - srv_sig_ptr->signature, kdc_sig_ptr, - context, krbtgt_keyblock); - if (ret) { - DEBUG(1, ("PAC Decode: Failed to verify the KDC signature: %s\n", - smb_get_krb5_error_message(context, ret, mem_ctx))); - return NT_STATUS_ACCESS_DENIED; - } - } - } - - if (tgs_authtime) { - /* Convert to NT time, so as not to loose accuracy in comparison */ - unix_to_nt_time(&tgs_authtime_nttime, tgs_authtime); - - if (tgs_authtime_nttime != logon_name->logon_time) { - DEBUG(2, ("PAC Decode: " - "Logon time mismatch between ticket and PAC!\n")); - DEBUG(2, ("PAC Decode: PAC: %s\n", - nt_time_string(mem_ctx, logon_name->logon_time))); - DEBUG(2, ("PAC Decode: Ticket: %s\n", - nt_time_string(mem_ctx, tgs_authtime_nttime))); - return NT_STATUS_ACCESS_DENIED; - } - } - - if (client_principal) { - ret = smb_krb5_parse_name_norealm(context, - logon_name->account_name, - &client_principal_pac); - if (ret) { - DEBUG(2, ("Could not parse name from PAC: [%s]:%s\n", - logon_name->account_name, error_message(ret))); - return NT_STATUS_INVALID_PARAMETER; - } - - bool_ret = smb_krb5_principal_compare_any_realm(context, - client_principal, - client_principal_pac); - - krb5_free_principal(context, client_principal_pac); - - if (!bool_ret) { - DEBUG(2, ("Name in PAC [%s] does not match principal name " - "in ticket\n", logon_name->account_name)); - return NT_STATUS_ACCESS_DENIED; - } - } - - DEBUG(3,("Found account name from PAC: %s [%s]\n", - logon_info->info3.base.account_name.string, - logon_info->info3.base.full_name.string)); - - DEBUG(10,("Successfully validated Kerberos PAC\n")); - - if (DEBUGLEVEL >= 10) { - const char *s; - s = NDR_PRINT_STRUCT_STRING(mem_ctx, PAC_DATA, pac_data); - if (s) { - DEBUGADD(10,("%s\n", s)); - } - } - - *pac_data_out = pac_data; - - return NT_STATUS_OK; -} - -#endif diff --git a/libcli/auth/wscript_build b/libcli/auth/wscript_build index 262d483e06..ab6ca4f94d 100644 --- a/libcli/auth/wscript_build +++ b/libcli/auth/wscript_build @@ -40,5 +40,5 @@ bld.SAMBA_SUBSYSTEM('SPNEGO_PARSE', deps='asn1util') bld.SAMBA_SUBSYSTEM('KRB5_WRAP', - source='krb5_wrap.c kerberos_pac.c', + source='krb5_wrap.c', deps='gssapi_krb5 krb5 ndr-krb5pac com_err KRB5_PAC') |