diff options
Diffstat (limited to 'auth')
| -rw-r--r-- | auth/auth_sam_reply.h | 22 | ||||
| -rw-r--r-- | auth/common_auth.h | 5 | ||||
| -rw-r--r-- | auth/kerberos/gssapi_pac.c | 152 | ||||
| -rw-r--r-- | auth/kerberos/kerberos_pac.c | 364 | ||||
| -rw-r--r-- | auth/kerberos/wscript_build | 3 | ||||
| -rw-r--r-- | auth/wscript_build | 11 |
6 files changed, 552 insertions, 5 deletions
diff --git a/auth/auth_sam_reply.h b/auth/auth_sam_reply.h index dea6501257..bd92872009 100644 --- a/auth/auth_sam_reply.h +++ b/auth/auth_sam_reply.h @@ -1,3 +1,25 @@ +/* + Unix SMB/CIFS implementation. + + Convert a server info struct into the form for PAC and NETLOGON replies + + Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004 + Copyright (C) Stefan Metzmacher <metze@samba.org> 2005 + + 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/>. +*/ + #ifndef __AUTH_AUTH_SAM_REPLY_H__ #define __AUTH_AUTH_SAM_REPLY_H__ diff --git a/auth/common_auth.h b/auth/common_auth.h index c64b46c7cf..b2db23c720 100644 --- a/auth/common_auth.h +++ b/auth/common_auth.h @@ -17,6 +17,9 @@ along with this program. If not, see <http://www.gnu.org/licenses/>. */ +#ifndef AUTH_COMMON_AUTH_H +#define AUTH_COMMON_AUTH_H + #define USER_INFO_CASE_INSENSITIVE_USERNAME 0x01 /* username may be in any case */ #define USER_INFO_CASE_INSENSITIVE_PASSWORD 0x02 /* password may be in any case */ #define USER_INFO_DONT_CHECK_UNIX_ACCOUNT 0x04 /* don't check unix account status */ @@ -59,3 +62,5 @@ struct auth_usersupplied_info } password; uint32_t flags; }; + +#endif diff --git a/auth/kerberos/gssapi_pac.c b/auth/kerberos/gssapi_pac.c new file mode 100644 index 0000000000..70bc9e576a --- /dev/null +++ b/auth/kerberos/gssapi_pac.c @@ -0,0 +1,152 @@ +/* + Unix SMB/CIFS implementation. + kerberos authorization data (PAC) utility library + Copyright (C) Andrew Bartlett <abartlet@samba.org> 2011 + Copyright (C) Simo Sorce 2010. + + 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 "libcli/auth/krb5_wrap.h" + +#if 0 +/* FIXME - need proper configure/waf test + * to determine if gss_mech_krb5 and friends + * exist. JRA. + */ +/* + * These are not exported by Solaris -lkrb5 + * Maybe move to libreplace somewhere? + */ +static const gss_OID_desc krb5_gss_oid_array[] = { + /* this is the official, rfc-specified OID */ + { 9, "\052\206\110\206\367\022\001\002\002" }, + /* this is the pre-RFC mech OID */ + { 5, "\053\005\001\005\002" }, + /* this is the unofficial, incorrect mech OID emitted by MS */ + { 9, "\052\206\110\202\367\022\001\002\002" }, + { 0, 0 } +}; + +const gss_OID_desc * const gss_mech_krb5 = krb5_gss_oid_array+0; +const gss_OID_desc * const gss_mech_krb5_old = krb5_gss_oid_array+1; +const gss_OID_desc * const gss_mech_krb5_wrong = krb5_gss_oid_array+2; +#endif + +/* The Heimdal OID for getting the PAC */ +#define EXTRACT_PAC_AUTHZ_DATA_FROM_SEC_CONTEXT_OID_LENGTH 8 +/* EXTRACTION OID AUTHZ ID */ +#define EXTRACT_PAC_AUTHZ_DATA_FROM_SEC_CONTEXT_OID "\x2a\x85\x70\x2b\x0d\x03" "\x81\x00" + +NTSTATUS gssapi_obtain_pac_blob(TALLOC_CTX *mem_ctx, + gss_ctx_id_t gssapi_context, + gss_name_t gss_client_name, + DATA_BLOB *pac_blob) +{ + NTSTATUS status; + OM_uint32 gss_maj, gss_min; +#ifdef HAVE_GSS_GET_NAME_ATTRIBUTE + gss_buffer_desc pac_buffer; + gss_buffer_desc pac_display_buffer; + gss_buffer_desc pac_name = { + .value = discard_const("urn:mspac:"), + .length = sizeof("urn:mspac:")-1 + }; + int more = -1; + int authenticated = false; + int complete = false; + + gss_maj = gss_get_name_attribute( + &gss_min, gss_client_name, &pac_name, + &authenticated, &complete, + &pac_buffer, &pac_display_buffer, &more); + + if (gss_maj != 0) { + DEBUG(0, ("obtaining PAC via GSSAPI gss_get_name_attribute failed: %s\n", + gssapi_error_string(mem_ctx, gss_maj, gss_min, gss_mech_krb5))); + return NT_STATUS_ACCESS_DENIED; + } else if (authenticated && complete) { + /* The PAC blob is returned directly */ + *pac_blob = data_blob_talloc(mem_ctx, pac_buffer.value, + pac_buffer.length); + + if (!pac_blob->data) { + status = NT_STATUS_NO_MEMORY; + } else { + status = NT_STATUS_OK; + } + + gss_maj = gss_release_buffer(&gss_min, &pac_buffer); + gss_maj = gss_release_buffer(&gss_min, &pac_display_buffer); + return status; + } else { + DEBUG(0, ("obtaining PAC via GSSAPI failed: authenticated: %s, complete: %s, more: %s\n", + authenticated ? "true" : "false", + complete ? "true" : "false", + more ? "true" : "false")); + return NT_STATUS_ACCESS_DENIED; + } + +#elif defined(HAVE_GSS_INQUIRE_SEC_CONTEXT_BY_OID) + gss_OID_desc pac_data_oid = { + .elements = discard_const(EXTRACT_PAC_AUTHZ_DATA_FROM_SEC_CONTEXT_OID), + .length = EXTRACT_PAC_AUTHZ_DATA_FROM_SEC_CONTEXT_OID_LENGTH + }; + + gss_buffer_set_t set = GSS_C_NO_BUFFER_SET; + + /* If we didn't have the routine to get a verified, validated + * PAC (supplied only by MIT at the time of writing), then try + * with the Heimdal OID (fetches the PAC directly and always + * validates) */ + gss_maj = gss_inquire_sec_context_by_oid( + &gss_min, gssapi_context, + &pac_data_oid, &set); + + /* First check for the error MIT gives for an unknown OID */ + if (gss_maj == GSS_S_UNAVAILABLE) { + DEBUG(1, ("unable to obtain a PAC against this GSSAPI library. " + "GSSAPI secured connections are available only with Heimdal or MIT Kerberos >= 1.8\n")); + } else if (gss_maj != 0) { + DEBUG(2, ("obtaining PAC via GSSAPI gss_inqiure_sec_context_by_oid (Heimdal OID) failed: %s\n", + gssapi_error_string(mem_ctx, gss_maj, gss_min, gss_mech_krb5))); + } else { + if (set == GSS_C_NO_BUFFER_SET) { + DEBUG(0, ("gss_inquire_sec_context_by_oid returned unknown " + "data in results.\n")); + return NT_STATUS_INTERNAL_ERROR; + } + + /* The PAC blob is returned directly */ + *pac_blob = data_blob_talloc(mem_ctx, set->elements[0].value, + set->elements[0].length); + if (!pac_blob->data) { + status = NT_STATUS_NO_MEMORY; + } else { + status = NT_STATUS_OK; + } + + gss_maj = gss_release_buffer_set(&gss_min, &set); + return status; + } +#else + DEBUG(1, ("unable to obtain a PAC against this GSSAPI library. " + "GSSAPI secured connections are available only with Heimdal or MIT Kerberos >= 1.8\n")); +#endif + return NT_STATUS_ACCESS_DENIED; +} +#endif diff --git a/auth/kerberos/kerberos_pac.c b/auth/kerberos/kerberos_pac.c new file mode 100644 index 0000000000..79d51b2645 --- /dev/null +++ b/auth/kerberos/kerberos_pac.c @@ -0,0 +1,364 @@ +/* + 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/auth/kerberos/wscript_build b/auth/kerberos/wscript_build new file mode 100644 index 0000000000..10707708f0 --- /dev/null +++ b/auth/kerberos/wscript_build @@ -0,0 +1,3 @@ +bld.SAMBA_SUBSYSTEM('KRB5_PAC', + source='gssapi_pac.c kerberos_pac.c', + deps='gssapi_krb5 krb5 ndr-krb5pac') diff --git a/auth/wscript_build b/auth/wscript_build index 75580fd299..0472a20a01 100644 --- a/auth/wscript_build +++ b/auth/wscript_build @@ -1,7 +1,8 @@ #!/usr/bin/env python -bld.SAMBA_SUBSYSTEM('auth_sam_reply', - source='auth_sam_reply.c', - deps='talloc', - autoproto='auth_sam_reply.h' - ) +bld.SAMBA_LIBRARY('auth_sam_reply', + source='auth_sam_reply.c', + deps='talloc security samba-util', + autoproto='auth_sam_reply.h', + private_library=True + ) |