#include "librpc/gen_ndr/ndr_krb5pac.h"
#include "smb_krb5.h"
#include "libads/kerberos_proto.h"
+#include "auth/common_auth.h"
+#include "lib/param/param.h"
+#include "librpc/crypto/gse.h"
+#include "auth/gensec/gensec.h"
+#include "../libcli/auth/spnego.h"
#ifdef HAVE_KRB5
-/****************************************************************
-****************************************************************/
-
-static krb5_error_code check_pac_checksum(TALLOC_CTX *mem_ctx,
- DATA_BLOB pac_data,
- struct PAC_SIGNATURE_DATA *sig,
- krb5_context context,
- 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
+#include "auth/kerberos/pac_utils.h"
- ret = smb_krb5_verify_checksum(context,
- keyblock,
- usage,
- &cksum,
- pac_data.data,
- pac_data.length);
+struct smb_krb5_context;
- 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 decode_pac_data(TALLOC_CTX *mem_ctx,
- DATA_BLOB *pac_data_blob,
- krb5_context context,
- krb5_keyblock *service_keyblock,
- krb5_const_principal client_principal,
- time_t tgs_authtime,
- struct PAC_DATA **pac_data_out)
+/****************************************************************
+Callback to get the PAC_LOGON_INFO from the blob
+****************************************************************/
+static NTSTATUS kerberos_fetch_pac(struct auth4_context *auth_ctx,
+ TALLOC_CTX *mem_ctx,
+ struct smb_krb5_context *smb_krb5_context,
+ DATA_BLOB *pac_blob,
+ const char *princ_name,
+ const struct tsocket_address *remote_address,
+ uint32_t session_info_flags,
+ struct auth_session_info **session_info)
{
- 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;
+ TALLOC_CTX *tmp_ctx;
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;
+ NTSTATUS status = NT_STATUS_INTERNAL_ERROR;
- pac_data = TALLOC_ZERO_P(mem_ctx, struct PAC_DATA);
- pac_data_raw = TALLOC_ZERO_P(mem_ctx, struct PAC_DATA_RAW);
- kdc_sig_wipe = TALLOC_ZERO_P(mem_ctx, struct PAC_SIGNATURE_DATA);
- srv_sig_wipe = TALLOC_ZERO_P(mem_ctx, struct PAC_SIGNATURE_DATA);
- if (!pac_data_raw || !pac_data || !kdc_sig_wipe || !srv_sig_wipe) {
+ tmp_ctx = talloc_new(mem_ctx);
+ if (!tmp_ctx) {
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 (pac_blob) {
+ status = kerberos_pac_logon_info(tmp_ctx, *pac_blob, NULL, NULL,
+ NULL, NULL, 0, &logon_info);
+ if (!NT_STATUS_IS_OK(status)) {
+ goto done;
}
}
- if (!logon_info) {
- DEBUG(0,("PAC no logon_info\n"));
- return NT_STATUS_INVALID_PARAMETER;
- }
+ talloc_set_name_const(logon_info, "struct PAC_LOGON_INFO");
- if (!logon_name) {
- DEBUG(0,("PAC no logon_name\n"));
- return NT_STATUS_INVALID_PARAMETER;
+ auth_ctx->private_data = talloc_steal(auth_ctx, logon_info);
+ *session_info = talloc_zero(mem_ctx, struct auth_session_info);
+ if (!*session_info) {
+ status = NT_STATUS_NO_MEMORY;
+ goto done;
}
+ status = NT_STATUS_OK;
- if (!srv_sig_ptr || !srv_sig_blob) {
- DEBUG(0,("PAC no srv_key\n"));
- return NT_STATUS_INVALID_PARAMETER;
- }
+done:
+ TALLOC_FREE(tmp_ctx);
- 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;
- }
-
- /* 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;
- }
-
- /* 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 = 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;
+ return status;
}
-/****************************************************************
-Given a username, password and other details, return the
-PAC_LOGON_INFO (the structure containing the important user
-information such as groups).
-****************************************************************/
-
+/*
+ * Given the username/password, do a kinit, store the ticket in
+ * cache_name if specified, and return the PAC_LOGON_INFO (the
+ * structure containing the important user information such as
+ * groups).
+ */
NTSTATUS kerberos_return_pac(TALLOC_CTX *mem_ctx,
const char *name,
const char *pass,
bool add_netbios_addr,
time_t renewable_time,
const char *impersonate_princ_s,
- struct PAC_LOGON_INFO **logon_info)
+ struct PAC_LOGON_INFO **_logon_info)
{
krb5_error_code ret;
NTSTATUS status = NT_STATUS_INVALID_PARAMETER;
- DATA_BLOB tkt, ap_rep, sesskey1, sesskey2;
- char *client_princ_out = NULL;
+ DATA_BLOB tkt, tkt_wrapped, ap_rep, sesskey1;
const char *auth_princ = NULL;
const char *local_service = NULL;
const char *cc = "MEMORY:kerberos_return_pac";
+ struct auth_session_info *session_info;
+ struct gensec_security *gensec_server_context;
+
+ struct gensec_settings *gensec_settings;
+ size_t idx = 0;
+ struct auth4_context *auth_context;
+ struct loadparm_context *lp_ctx;
+ struct PAC_LOGON_INFO *logon_info = NULL;
+
+ TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
+ NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
ZERO_STRUCT(tkt);
ZERO_STRUCT(ap_rep);
ZERO_STRUCT(sesskey1);
- ZERO_STRUCT(sesskey2);
if (!name || !pass) {
return NT_STATUS_INVALID_PARAMETER;
NT_STATUS_HAVE_NO_MEMORY(auth_princ);
local_service = talloc_asprintf(mem_ctx, "%s$@%s",
- global_myname(), lp_realm());
+ lp_netbios_name(), lp_realm());
NT_STATUS_HAVE_NO_MEMORY(local_service);
ret = kerberos_kinit_password_ext(auth_princ,
status = krb5_to_nt_status(ret);
goto out;
}
- status = ads_verify_ticket(mem_ctx,
- lp_realm(),
- time_offset,
- &tkt,
- &client_princ_out,
- logon_info,
- &ap_rep,
- &sesskey2,
- False);
+
+ /* wrap that up in a nice GSS-API wrapping */
+ tkt_wrapped = spnego_gen_krb5_wrap(tmp_ctx, tkt, TOK_ID_KRB_AP_REQ);
+ if (tkt_wrapped.data == NULL) {
+ status = NT_STATUS_NO_MEMORY;
+ goto out;
+ }
+
+ auth_context = talloc_zero(tmp_ctx, struct auth4_context);
+ if (auth_context == NULL) {
+ status = NT_STATUS_NO_MEMORY;
+ goto out;
+ }
+ auth_context->generate_session_info_pac = kerberos_fetch_pac;
+
+ lp_ctx = loadparm_init_s3(tmp_ctx, loadparm_s3_helpers());
+ if (lp_ctx == NULL) {
+ status = NT_STATUS_INVALID_SERVER_STATE;
+ DEBUG(10, ("loadparm_init_s3 failed\n"));
+ goto out;
+ }
+
+ gensec_settings = lpcfg_gensec_settings(tmp_ctx, lp_ctx);
+ if (lp_ctx == NULL) {
+ status = NT_STATUS_NO_MEMORY;
+ DEBUG(10, ("lpcfg_gensec_settings failed\n"));
+ goto out;
+ }
+
+ gensec_settings->backends = talloc_zero_array(gensec_settings,
+ struct gensec_security_ops *, 2);
+ if (gensec_settings->backends == NULL) {
+ status = NT_STATUS_NO_MEMORY;
+ goto out;
+ }
+
+ gensec_init();
+
+ gensec_settings->backends[idx++] = &gensec_gse_krb5_security_ops;
+
+ status = gensec_server_start(tmp_ctx, gensec_settings,
+ auth_context, &gensec_server_context);
+
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(1, (__location__ "Failed to start server-side GENSEC to validate a Kerberos ticket: %s\n", nt_errstr(status)));
+ goto out;
+ }
+
+ talloc_unlink(tmp_ctx, lp_ctx);
+ talloc_unlink(tmp_ctx, gensec_settings);
+ talloc_unlink(tmp_ctx, auth_context);
+
+ status = gensec_start_mech_by_oid(gensec_server_context, GENSEC_OID_KERBEROS5);
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(1, (__location__ "Failed to start server-side GENSEC krb5 to validate a Kerberos ticket: %s\n", nt_errstr(status)));
+ goto out;
+ }
+
+ /* Do a client-server update dance */
+ status = gensec_update(gensec_server_context, tmp_ctx, NULL, tkt_wrapped, &ap_rep);
if (!NT_STATUS_IS_OK(status)) {
- DEBUG(1,("ads_verify_ticket failed: %s\n",
- nt_errstr(status)));
+ DEBUG(1, ("gensec_update() failed: %s\n", nt_errstr(status)));
goto out;
}
- if (!*logon_info) {
+ /* Now return the PAC information to the callers. We ingore
+ * the session_info and instead pick out the PAC via the
+ * private_data on the auth_context */
+ status = gensec_session_info(gensec_server_context, tmp_ctx, &session_info);
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(1, ("Unable to obtain PAC via gensec_session_info\n"));
+ goto out;
+ }
+
+ logon_info = talloc_get_type_abort(gensec_server_context->auth_context->private_data,
+ struct PAC_LOGON_INFO);
+ if (logon_info == NULL) {
DEBUG(1,("no PAC\n"));
status = NT_STATUS_INVALID_PARAMETER;
goto out;
}
+ *_logon_info = talloc_move(mem_ctx, &logon_info);
+
out:
+ talloc_free(tmp_ctx);
if (cc != cache_name) {
ads_kdestroy(cc);
}
data_blob_free(&tkt);
data_blob_free(&ap_rep);
data_blob_free(&sesskey1);
- data_blob_free(&sesskey2);
-
- TALLOC_FREE(client_princ_out);
return status;
}
git.samba.org / abartlet / samba-debian.git / blobdiff