diff options
Diffstat (limited to 'source4/auth/kerberos/kerberos_pac.c')
| -rw-r--r-- | source4/auth/kerberos/kerberos_pac.c | 777 |
1 files changed, 777 insertions, 0 deletions
diff --git a/source4/auth/kerberos/kerberos_pac.c b/source4/auth/kerberos/kerberos_pac.c new file mode 100644 index 0000000000..2943e05b18 --- /dev/null +++ b/source4/auth/kerberos/kerberos_pac.c @@ -0,0 +1,777 @@ +/* + Unix SMB/CIFS implementation. + + Create and parse the krb5 PAC + + Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005,2008 + Copyright (C) Andrew Tridgell 2001 + Copyright (C) Luke Howard 2002-2003 + Copyright (C) Stefan Metzmacher 2004-2005 + + 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/>. +*/ + +#include "includes.h" +#include "system/kerberos.h" +#include "auth/auth.h" +#include "auth/kerberos/kerberos.h" +#include "librpc/gen_ndr/ndr_krb5pac.h" +#include "lib/ldb/include/ldb.h" +#include "auth/auth_sam_reply.h" +#include "param/param.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_crypto crypto; + Checksum cksum; + + cksum.cksumtype = (CKSUMTYPE)sig->type; + cksum.checksum.length = sig->signature.length; + cksum.checksum.data = sig->signature.data; + + ret = krb5_crypto_init(context, + keyblock, + 0, + &crypto); + if (ret) { + DEBUG(0,("krb5_crypto_init() failed: %s\n", + smb_get_krb5_error_message(context, ret, mem_ctx))); + return ret; + } + ret = krb5_verify_checksum(context, + crypto, + KRB5_KU_OTHER_CKSUM, + pac_data.data, + pac_data.length, + &cksum); + krb5_crypto_destroy(context, crypto); + + return ret; +} + + NTSTATUS kerberos_decode_pac(TALLOC_CTX *mem_ctx, + struct smb_iconv_convenience *iconv_convenience, + struct PAC_DATA **pac_data_out, + DATA_BLOB blob, + krb5_context context, + const krb5_keyblock *krbtgt_keyblock, + const krb5_keyblock *service_keyblock, + krb5_const_principal client_principal, + time_t tgs_authtime, + krb5_error_code *k5ret) +{ + krb5_error_code ret; + NTSTATUS status; + enum ndr_err_code ndr_err; + 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_INFO *logon_info = NULL; + struct PAC_LOGON_NAME *logon_name = NULL; + struct PAC_DATA *pac_data; + struct PAC_DATA_RAW *pac_data_raw; + + DATA_BLOB *srv_sig_blob = NULL; + DATA_BLOB *kdc_sig_blob = NULL; + + DATA_BLOB modified_pac_blob; + NTTIME tgs_authtime_nttime; + krb5_principal client_principal_pac; + int i; + + krb5_clear_error_string(context); + + if (k5ret) { + *k5ret = KRB5_PARSE_MALFORMED; + } + + 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) { + if (k5ret) { + *k5ret = ENOMEM; + } + return NT_STATUS_NO_MEMORY; + } + + ndr_err = ndr_pull_struct_blob(&blob, pac_data, + iconv_convenience, 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(&blob, pac_data_raw, + iconv_convenience, 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++) { + if (pac_data->buffers[i].type != pac_data_raw->buffers[i].type) { + DEBUG(0,("misparse! PAC_DATA buffer %d has type %d while PAC_DATA_RAW has %d\n", + i, pac_data->buffers[i].type, pac_data->buffers[i].type)); + return NT_STATUS_INVALID_PARAMETER; + } + switch (pac_data->buffers[i].type) { + case PAC_TYPE_LOGON_INFO: + if (!pac_data->buffers[i].info) { + break; + } + logon_info = pac_data->buffers[i].info->logon_info.info; + break; + case PAC_TYPE_SRV_CHECKSUM: + if (!pac_data->buffers[i].info) { + break; + } + srv_sig_ptr = &pac_data->buffers[i].info->srv_cksum; + srv_sig_blob = &pac_data_raw->buffers[i].info->remaining; + break; + case PAC_TYPE_KDC_CHECKSUM: + if (!pac_data->buffers[i].info) { + break; + } + kdc_sig_ptr = &pac_data->buffers[i].info->kdc_cksum; + kdc_sig_blob = &pac_data_raw->buffers[i].info->remaining; + break; + case PAC_TYPE_LOGON_NAME: + logon_name = &pac_data->buffers[i].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, + iconv_convenience, 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, + iconv_convenience, 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, + iconv_convenience, + 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, + iconv_convenience, + 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, + iconv_convenience, + 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; + } + + /* 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", + smb_get_krb5_error_message(context, ret, mem_ctx))); + if (k5ret) { + *k5ret = ret; + } + return NT_STATUS_ACCESS_DENIED; + } + + if (krbtgt_keyblock) { + 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))); + if (k5ret) { + *k5ret = ret; + } + return NT_STATUS_ACCESS_DENIED; + } + } + + /* 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; + } + + ret = krb5_parse_name_flags(context, logon_name->account_name, KRB5_PRINCIPAL_PARSE_NO_REALM, + &client_principal_pac); + if (ret) { + DEBUG(2, ("Could not parse name from incoming PAC: [%s]: %s\n", + logon_name->account_name, + smb_get_krb5_error_message(context, ret, mem_ctx))); + if (k5ret) { + *k5ret = ret; + } + return NT_STATUS_INVALID_PARAMETER; + } + + if (!krb5_principal_compare_any_realm(context, client_principal, client_principal_pac)) { + DEBUG(2, ("Name in PAC [%s] does not match principal name in ticket\n", + logon_name->account_name)); + return NT_STATUS_ACCESS_DENIED; + } + +#if 0 + if (strcasecmp(logon_info->info3.base.account_name.string, + "Administrator")== 0) { + file_save("tmp_pac_data-admin.dat",blob.data,blob.length); + } +#endif + + DEBUG(3,("Found account name from PAC: %s [%s]\n", + logon_info->info3.base.account_name.string, + logon_info->info3.base.full_name.string)); + *pac_data_out = pac_data; + + return NT_STATUS_OK; +} + +_PUBLIC_ NTSTATUS kerberos_pac_logon_info(TALLOC_CTX *mem_ctx, + struct smb_iconv_convenience *iconv_convenience, + struct PAC_LOGON_INFO **logon_info, + DATA_BLOB blob, + krb5_context context, + const krb5_keyblock *krbtgt_keyblock, + const krb5_keyblock *service_keyblock, + krb5_const_principal client_principal, + time_t tgs_authtime, + krb5_error_code *k5ret) +{ + NTSTATUS nt_status; + struct PAC_DATA *pac_data; + int i; + nt_status = kerberos_decode_pac(mem_ctx, + iconv_convenience, + &pac_data, + blob, + context, + krbtgt_keyblock, + service_keyblock, + client_principal, + tgs_authtime, + k5ret); + if (!NT_STATUS_IS_OK(nt_status)) { + return nt_status; + } + + *logon_info = NULL; + for (i=0; i < pac_data->num_buffers; i++) { + if (pac_data->buffers[i].type != PAC_TYPE_LOGON_INFO) { + continue; + } + *logon_info = pac_data->buffers[i].info->logon_info.info; + } + if (!*logon_info) { + return NT_STATUS_INVALID_PARAMETER; + } + return NT_STATUS_OK; +} + +static krb5_error_code make_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_crypto crypto; + Checksum cksum; + + + ret = krb5_crypto_init(context, + keyblock, + 0, + &crypto); + if (ret) { + DEBUG(0,("krb5_crypto_init() failed: %s\n", + smb_get_krb5_error_message(context, ret, mem_ctx))); + return ret; + } + ret = krb5_create_checksum(context, + crypto, + KRB5_KU_OTHER_CKSUM, + 0, + pac_data->data, + pac_data->length, + &cksum); + if (ret) { + DEBUG(2, ("PAC Verification failed: %s\n", + smb_get_krb5_error_message(context, ret, mem_ctx))); + } + + krb5_crypto_destroy(context, crypto); + + if (ret) { + return ret; + } + + sig->type = cksum.cksumtype; + sig->signature = data_blob_talloc(mem_ctx, cksum.checksum.data, cksum.checksum.length); + free_Checksum(&cksum); + + return 0; +} + + krb5_error_code kerberos_encode_pac(TALLOC_CTX *mem_ctx, + struct smb_iconv_convenience *iconv_convenience, + struct PAC_DATA *pac_data, + krb5_context context, + const krb5_keyblock *krbtgt_keyblock, + const krb5_keyblock *service_keyblock, + DATA_BLOB *pac) +{ + NTSTATUS nt_status; + krb5_error_code ret; + enum ndr_err_code ndr_err; + DATA_BLOB zero_blob = data_blob(NULL, 0); + DATA_BLOB tmp_blob = data_blob(NULL, 0); + struct PAC_SIGNATURE_DATA *kdc_checksum = NULL; + struct PAC_SIGNATURE_DATA *srv_checksum = NULL; + int i; + + /* First, just get the keytypes filled in (and lengths right, eventually) */ + for (i=0; i < pac_data->num_buffers; i++) { + if (pac_data->buffers[i].type != PAC_TYPE_KDC_CHECKSUM) { + continue; + } + kdc_checksum = &pac_data->buffers[i].info->kdc_cksum, + ret = make_pac_checksum(mem_ctx, &zero_blob, + kdc_checksum, + context, krbtgt_keyblock); + if (ret) { + DEBUG(2, ("making krbtgt PAC checksum failed: %s\n", + smb_get_krb5_error_message(context, ret, mem_ctx))); + talloc_free(pac_data); + return ret; + } + } + + for (i=0; i < pac_data->num_buffers; i++) { + if (pac_data->buffers[i].type != PAC_TYPE_SRV_CHECKSUM) { + continue; + } + srv_checksum = &pac_data->buffers[i].info->srv_cksum; + ret = make_pac_checksum(mem_ctx, &zero_blob, + srv_checksum, + context, service_keyblock); + if (ret) { + DEBUG(2, ("making service PAC checksum failed: %s\n", + smb_get_krb5_error_message(context, ret, mem_ctx))); + talloc_free(pac_data); + return ret; + } + } + + if (!kdc_checksum) { + DEBUG(2, ("Invalid PAC constructed for signing, no KDC checksum present!")); + return EINVAL; + } + if (!srv_checksum) { + DEBUG(2, ("Invalid PAC constructed for signing, no SRV checksum present!")); + return EINVAL; + } + + /* But wipe out the actual signatures */ + memset(kdc_checksum->signature.data, '\0', kdc_checksum->signature.length); + memset(srv_checksum->signature.data, '\0', srv_checksum->signature.length); + + ndr_err = ndr_push_struct_blob(&tmp_blob, mem_ctx, + iconv_convenience, + pac_data, + (ndr_push_flags_fn_t)ndr_push_PAC_DATA); + if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) { + nt_status = ndr_map_error2ntstatus(ndr_err); + DEBUG(1, ("PAC (presig) push failed: %s\n", nt_errstr(nt_status))); + talloc_free(pac_data); + return EINVAL; + } + + /* Then sign the result of the previous push, where the sig was zero'ed out */ + ret = make_pac_checksum(mem_ctx, &tmp_blob, srv_checksum, + context, service_keyblock); + + /* Then sign Server checksum */ + ret = make_pac_checksum(mem_ctx, &srv_checksum->signature, kdc_checksum, context, krbtgt_keyblock); + if (ret) { + DEBUG(2, ("making krbtgt PAC checksum failed: %s\n", + smb_get_krb5_error_message(context, ret, mem_ctx))); + talloc_free(pac_data); + return ret; + } + + /* And push it out again, this time to the world. This relies on determanistic pointer values */ + ndr_err = ndr_push_struct_blob(&tmp_blob, mem_ctx, + iconv_convenience, + pac_data, + (ndr_push_flags_fn_t)ndr_push_PAC_DATA); + if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) { + nt_status = ndr_map_error2ntstatus(ndr_err); + DEBUG(1, ("PAC (final) push failed: %s\n", nt_errstr(nt_status))); + talloc_free(pac_data); + return EINVAL; + } + + *pac = tmp_blob; + + return ret; +} + + + krb5_error_code kerberos_create_pac(TALLOC_CTX *mem_ctx, + struct smb_iconv_convenience *iconv_convenience, + struct auth_serversupplied_info *server_info, + krb5_context context, + const krb5_keyblock *krbtgt_keyblock, + const krb5_keyblock *service_keyblock, + krb5_principal client_principal, + time_t tgs_authtime, + DATA_BLOB *pac) +{ + NTSTATUS nt_status; + krb5_error_code ret; + struct PAC_DATA *pac_data = talloc(mem_ctx, struct PAC_DATA); + struct netr_SamInfo3 *sam3; + union PAC_INFO *u_LOGON_INFO; + struct PAC_LOGON_INFO *LOGON_INFO; + union PAC_INFO *u_LOGON_NAME; + struct PAC_LOGON_NAME *LOGON_NAME; + union PAC_INFO *u_KDC_CHECKSUM; + union PAC_INFO *u_SRV_CHECKSUM; + + char *name; + + enum { + PAC_BUF_LOGON_INFO = 0, + PAC_BUF_LOGON_NAME = 1, + PAC_BUF_SRV_CHECKSUM = 2, + PAC_BUF_KDC_CHECKSUM = 3, + PAC_BUF_NUM_BUFFERS = 4 + }; + + if (!pac_data) { + return ENOMEM; + } + + pac_data->num_buffers = PAC_BUF_NUM_BUFFERS; + pac_data->version = 0; + + pac_data->buffers = talloc_array(pac_data, + struct PAC_BUFFER, + pac_data->num_buffers); + if (!pac_data->buffers) { + talloc_free(pac_data); + return ENOMEM; + } + + /* LOGON_INFO */ + u_LOGON_INFO = talloc_zero(pac_data->buffers, union PAC_INFO); + if (!u_LOGON_INFO) { + talloc_free(pac_data); + return ENOMEM; + } + pac_data->buffers[PAC_BUF_LOGON_INFO].type = PAC_TYPE_LOGON_INFO; + pac_data->buffers[PAC_BUF_LOGON_INFO].info = u_LOGON_INFO; + + /* LOGON_NAME */ + u_LOGON_NAME = talloc_zero(pac_data->buffers, union PAC_INFO); + if (!u_LOGON_NAME) { + talloc_free(pac_data); + return ENOMEM; + } + pac_data->buffers[PAC_BUF_LOGON_NAME].type = PAC_TYPE_LOGON_NAME; + pac_data->buffers[PAC_BUF_LOGON_NAME].info = u_LOGON_NAME; + LOGON_NAME = &u_LOGON_NAME->logon_name; + + /* SRV_CHECKSUM */ + u_SRV_CHECKSUM = talloc_zero(pac_data->buffers, union PAC_INFO); + if (!u_SRV_CHECKSUM) { + talloc_free(pac_data); + return ENOMEM; + } + pac_data->buffers[PAC_BUF_SRV_CHECKSUM].type = PAC_TYPE_SRV_CHECKSUM; + pac_data->buffers[PAC_BUF_SRV_CHECKSUM].info = u_SRV_CHECKSUM; + + /* KDC_CHECKSUM */ + u_KDC_CHECKSUM = talloc_zero(pac_data->buffers, union PAC_INFO); + if (!u_KDC_CHECKSUM) { + talloc_free(pac_data); + return ENOMEM; + } + pac_data->buffers[PAC_BUF_KDC_CHECKSUM].type = PAC_TYPE_KDC_CHECKSUM; + pac_data->buffers[PAC_BUF_KDC_CHECKSUM].info = u_KDC_CHECKSUM; + + /* now the real work begins... */ + + LOGON_INFO = talloc_zero(u_LOGON_INFO, struct PAC_LOGON_INFO); + if (!LOGON_INFO) { + talloc_free(pac_data); + return ENOMEM; + } + nt_status = auth_convert_server_info_saminfo3(LOGON_INFO, server_info, &sam3); + if (!NT_STATUS_IS_OK(nt_status)) { + DEBUG(1, ("Getting Samba info failed: %s\n", nt_errstr(nt_status))); + talloc_free(pac_data); + return EINVAL; + } + + u_LOGON_INFO->logon_info.info = LOGON_INFO; + LOGON_INFO->info3 = *sam3; + + ret = krb5_unparse_name_flags(context, client_principal, + KRB5_PRINCIPAL_UNPARSE_NO_REALM, &name); + if (ret) { + return ret; + } + LOGON_NAME->account_name = talloc_strdup(LOGON_NAME, name); + free(name); + /* + this logon_time field is absolutely critical. This is what + caused all our PAC troubles :-) + */ + unix_to_nt_time(&LOGON_NAME->logon_time, tgs_authtime); + + ret = kerberos_encode_pac(mem_ctx, + iconv_convenience, + pac_data, + context, + krbtgt_keyblock, + service_keyblock, + pac); + talloc_free(pac_data); + return ret; +} + +krb5_error_code kerberos_pac_to_server_info(TALLOC_CTX *mem_ctx, + struct smb_iconv_convenience *iconv_convenience, + krb5_pac pac, + krb5_context context, + struct auth_serversupplied_info **server_info) +{ + NTSTATUS nt_status; + enum ndr_err_code ndr_err; + krb5_error_code ret; + + DATA_BLOB pac_logon_info_in, pac_srv_checksum_in, pac_kdc_checksum_in; + krb5_data k5pac_logon_info_in, k5pac_srv_checksum_in, k5pac_kdc_checksum_in; + + union PAC_INFO info; + union netr_Validation validation; + struct auth_serversupplied_info *server_info_out; + + TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx); + + if (!tmp_ctx) { + return ENOMEM; + } + + ret = krb5_pac_get_buffer(context, pac, PAC_TYPE_LOGON_INFO, &k5pac_logon_info_in); + if (ret != 0) { + talloc_free(tmp_ctx); + return EINVAL; + } + + pac_logon_info_in = data_blob_const(k5pac_logon_info_in.data, k5pac_logon_info_in.length); + + ndr_err = ndr_pull_union_blob(&pac_logon_info_in, tmp_ctx, iconv_convenience, &info, + PAC_TYPE_LOGON_INFO, + (ndr_pull_flags_fn_t)ndr_pull_PAC_INFO); + krb5_data_free(&k5pac_logon_info_in); + if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err) || !info.logon_info.info) { + nt_status = ndr_map_error2ntstatus(ndr_err); + DEBUG(0,("can't parse the PAC LOGON_INFO: %s\n", nt_errstr(nt_status))); + talloc_free(tmp_ctx); + return EINVAL; + } + + /* Pull this right into the normal auth sysstem structures */ + validation.sam3 = &info.logon_info.info->info3; + nt_status = make_server_info_netlogon_validation(mem_ctx, + "", + 3, &validation, + &server_info_out); + if (!NT_STATUS_IS_OK(nt_status)) { + talloc_free(tmp_ctx); + return EINVAL; + } + + ret = krb5_pac_get_buffer(context, pac, PAC_TYPE_SRV_CHECKSUM, &k5pac_srv_checksum_in); + if (ret != 0) { + talloc_free(tmp_ctx); + return ret; + } + + pac_srv_checksum_in = data_blob_const(k5pac_srv_checksum_in.data, k5pac_srv_checksum_in.length); + + ndr_err = ndr_pull_struct_blob(&pac_srv_checksum_in, server_info_out, + iconv_convenience, &server_info_out->pac_srv_sig, + (ndr_pull_flags_fn_t)ndr_pull_PAC_SIGNATURE_DATA); + krb5_data_free(&k5pac_srv_checksum_in); + if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) { + nt_status = ndr_map_error2ntstatus(ndr_err); + DEBUG(0,("can't parse the KDC signature: %s\n", + nt_errstr(nt_status))); + return EINVAL; + } + + ret = krb5_pac_get_buffer(context, pac, PAC_TYPE_KDC_CHECKSUM, &k5pac_kdc_checksum_in); + if (ret != 0) { + talloc_free(tmp_ctx); + return ret; + } + + pac_kdc_checksum_in = data_blob_const(k5pac_kdc_checksum_in.data, k5pac_kdc_checksum_in.length); + + ndr_err = ndr_pull_struct_blob(&pac_kdc_checksum_in, server_info_out, + iconv_convenience, &server_info_out->pac_kdc_sig, + (ndr_pull_flags_fn_t)ndr_pull_PAC_SIGNATURE_DATA); + krb5_data_free(&k5pac_kdc_checksum_in); + if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) { + nt_status = ndr_map_error2ntstatus(ndr_err); + DEBUG(0,("can't parse the KDC signature: %s\n", + nt_errstr(nt_status))); + return EINVAL; + } + + *server_info = server_info_out; + + return 0; +} + + +NTSTATUS kerberos_pac_blob_to_server_info(TALLOC_CTX *mem_ctx, + struct smb_iconv_convenience *iconv_convenience, + DATA_BLOB pac_blob, + krb5_context context, + struct auth_serversupplied_info **server_info) +{ + krb5_error_code ret; + krb5_pac pac; + ret = krb5_pac_parse(context, + pac_blob.data, pac_blob.length, + &pac); + if (ret) { + return map_nt_error_from_unix(ret); + } + + + ret = kerberos_pac_to_server_info(mem_ctx, iconv_convenience, pac, context, server_info); + krb5_pac_free(context, pac); + if (ret) { + return map_nt_error_from_unix(ret); + } + return NT_STATUS_OK; +} |