#include "system/kerberos.h"
#include "auth/kerberos/kerberos.h"
#include "auth/auth.h"
-#include "lib/socket/socket.h"
#include "lib/tsocket/tsocket.h"
-#include "librpc/rpc/dcerpc.h"
+#include "librpc/gen_ndr/dcerpc.h"
#include "auth/credentials/credentials.h"
#include "auth/credentials/credentials_krb5.h"
#include "auth/kerberos/kerberos_credentials.h"
#include "auth/gensec/gensec.h"
+#include "auth/gensec/gensec_internal.h"
#include "auth/gensec/gensec_proto.h"
+#include "auth/gensec/gensec_toplevel_proto.h"
#include "param/param.h"
#include "auth/auth_sam_reply.h"
#include "lib/util/util_net.h"
+#include "../lib/util/asn1.h"
+#include "auth/kerberos/pac_utils.h"
+#include "gensec_krb5.h"
+
+_PUBLIC_ NTSTATUS gensec_krb5_init(void);
enum GENSEC_KRB5_STATE {
GENSEC_KRB5_SERVER_START,
};
struct gensec_krb5_state {
- DATA_BLOB session_key;
- DATA_BLOB pac;
enum GENSEC_KRB5_STATE state_position;
struct smb_krb5_context *smb_krb5_context;
krb5_auth_context auth_context;
gensec_krb5_state->ticket = NULL;
ZERO_STRUCT(gensec_krb5_state->enc_ticket);
gensec_krb5_state->keyblock = NULL;
- gensec_krb5_state->session_key = data_blob(NULL, 0);
- gensec_krb5_state->pac = data_blob(NULL, 0);
gensec_krb5_state->gssapi = gssapi;
talloc_set_destructor(gensec_krb5_state, gensec_krb5_destroy);
(struct sockaddr *) &ss,
sizeof(struct sockaddr_storage));
if (socklen < 0) {
+ talloc_free(gensec_krb5_state);
return NT_STATUS_INTERNAL_ERROR;
}
ret = krb5_sockaddr2address(gensec_krb5_state->smb_krb5_context->krb5_context,
(struct sockaddr *) &ss,
sizeof(struct sockaddr_storage));
if (socklen < 0) {
+ talloc_free(gensec_krb5_state);
return NT_STATUS_INTERNAL_ERROR;
}
ret = krb5_sockaddr2address(gensec_krb5_state->smb_krb5_context->krb5_context,
static NTSTATUS gensec_krb5_common_client_start(struct gensec_security *gensec_security, bool gssapi)
{
+ const char *hostname;
struct gensec_krb5_state *gensec_krb5_state;
- krb5_error_code ret;
NTSTATUS nt_status;
- struct ccache_container *ccache_container;
- const char *hostname;
- const char *error_string;
- const char *principal;
- krb5_data in_data;
- struct tevent_context *previous_ev;
-
hostname = gensec_get_target_hostname(gensec_security);
if (!hostname) {
- DEBUG(1, ("Could not determine hostname for target computer, cannot use kerberos\n"));
+ DEBUG(3, ("No hostname for target computer passed in, cannot use kerberos for this connection\n"));
return NT_STATUS_INVALID_PARAMETER;
}
if (is_ipaddress(hostname)) {
gensec_krb5_state->ap_req_options = AP_OPTS_USE_SUBKEY;
if (gensec_krb5_state->gssapi) {
- /* The Fake GSSAPI modal emulates Samba3, which does not do mutual authentication */
+ /* The Fake GSSAPI model emulates Samba3, which does not do mutual authentication */
if (gensec_setting_bool(gensec_security->settings, "gensec_fake_gssapi_krb5", "mutual", false)) {
gensec_krb5_state->ap_req_options |= AP_OPTS_MUTUAL_REQUIRED;
}
gensec_krb5_state->ap_req_options |= AP_OPTS_MUTUAL_REQUIRED;
}
}
+ return NT_STATUS_OK;
+}
+
+static NTSTATUS gensec_krb5_common_client_creds(struct gensec_security *gensec_security,
+ struct tevent_context *ev,
+ bool gssapi)
+{
+ struct gensec_krb5_state *gensec_krb5_state;
+ krb5_error_code ret;
+ struct ccache_container *ccache_container;
+ const char *error_string;
+ const char *principal;
+ const char *hostname;
+ krb5_data in_data = { .length = 0 };
+ krb5_data *in_data_p = NULL;
+ struct tevent_context *previous_ev;
+
+ if (lpcfg_parm_bool(gensec_security->settings->lp_ctx,
+ NULL, "gensec_krb5", "send_authenticator_checksum", true)) {
+ in_data_p = &in_data;
+ }
+
+ gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
principal = gensec_get_target_principal(gensec_security);
+ hostname = gensec_get_target_hostname(gensec_security);
ret = cli_credentials_get_ccache(gensec_get_credentials(gensec_security),
- gensec_security->event_ctx,
+ ev,
gensec_security->settings->lp_ctx, &ccache_container, &error_string);
switch (ret) {
case 0:
DEBUG(1, ("gensec_krb5_start: Aquiring initiator credentials failed: %s\n", error_string));
return NT_STATUS_UNSUCCESSFUL;
}
- in_data.length = 0;
/* Do this every time, in case we have weird recursive issues here */
- ret = smb_krb5_context_set_event_ctx(gensec_krb5_state->smb_krb5_context, gensec_security->event_ctx, &previous_ev);
+ ret = smb_krb5_context_set_event_ctx(gensec_krb5_state->smb_krb5_context, ev, &previous_ev);
if (ret != 0) {
DEBUG(1, ("gensec_krb5_start: Setting event context failed\n"));
return NT_STATUS_NO_MEMORY;
&gensec_krb5_state->auth_context,
gensec_krb5_state->ap_req_options,
target_principal,
- &in_data, ccache_container->ccache,
+ in_data_p, ccache_container->ccache,
&gensec_krb5_state->enc_ticket);
krb5_free_principal(gensec_krb5_state->smb_krb5_context->krb5_context,
target_principal);
gensec_krb5_state->ap_req_options,
gensec_get_target_service(gensec_security),
hostname,
- &in_data, ccache_container->ccache,
+ in_data_p, ccache_container->ccache,
&gensec_krb5_state->enc_ticket);
}
- smb_krb5_context_remove_event_ctx(gensec_krb5_state->smb_krb5_context, previous_ev, gensec_security->event_ctx);
+ smb_krb5_context_remove_event_ctx(gensec_krb5_state->smb_krb5_context, previous_ev, ev);
switch (ret) {
case 0:
return gensec_krb5_common_client_start(gensec_security, true);
}
-/**
- * Check if the packet is one for this mechansim
- *
- * @param gensec_security GENSEC state
- * @param in The request, as a DATA_BLOB
- * @return Error, INVALID_PARAMETER if it's not a packet for us
- * or NT_STATUS_OK if the packet is ok.
- */
-static NTSTATUS gensec_fake_gssapi_krb5_magic(struct gensec_security *gensec_security,
- const DATA_BLOB *in)
+/*
+ generate a krb5 GSS-API wrapper packet given a ticket
+*/
+static DATA_BLOB gensec_gssapi_gen_krb5_wrap(TALLOC_CTX *mem_ctx, const DATA_BLOB *ticket, const uint8_t tok_id[2])
{
- if (gensec_gssapi_check_oid(in, GENSEC_OID_KERBEROS5)) {
- return NT_STATUS_OK;
- } else {
- return NT_STATUS_INVALID_PARAMETER;
+ struct asn1_data *data;
+ DATA_BLOB ret = data_blob_null;
+
+ data = asn1_init(mem_ctx);
+ if (!data || !ticket->data) {
+ return ret;
+ }
+
+ if (!asn1_push_tag(data, ASN1_APPLICATION(0))) goto err;
+ if (!asn1_write_OID(data, GENSEC_OID_KERBEROS5)) goto err;
+
+ if (!asn1_write(data, tok_id, 2)) goto err;
+ if (!asn1_write(data, ticket->data, ticket->length)) goto err;
+ if (!asn1_pop_tag(data)) goto err;
+
+
+ if (!asn1_extract_blob(data, mem_ctx, &ret)) {
+ goto err;
}
+ asn1_free(data);
+
+ return ret;
+
+ err:
+
+ DEBUG(1, ("Failed to build krb5 wrapper at offset %d\n",
+ (int)asn1_current_ofs(data)));
+ asn1_free(data);
+ return ret;
}
+/*
+ parse a krb5 GSS-API wrapper packet giving a ticket
+*/
+static bool gensec_gssapi_parse_krb5_wrap(TALLOC_CTX *mem_ctx, const DATA_BLOB *blob, DATA_BLOB *ticket, uint8_t tok_id[2])
+{
+ bool ret = false;
+ struct asn1_data *data = asn1_init(mem_ctx);
+ int data_remaining;
+
+ if (!data) {
+ return false;
+ }
+
+ if (!asn1_load(data, *blob)) goto err;
+ if (!asn1_start_tag(data, ASN1_APPLICATION(0))) goto err;
+ if (!asn1_check_OID(data, GENSEC_OID_KERBEROS5)) goto err;
+
+ data_remaining = asn1_tag_remaining(data);
+
+ if (data_remaining < 3) {
+ asn1_set_error(data);
+ } else {
+ if (!asn1_read(data, tok_id, 2)) goto err;
+ data_remaining -= 2;
+ *ticket = data_blob_talloc(mem_ctx, NULL, data_remaining);
+ if (!asn1_read(data, ticket->data, ticket->length)) goto err;
+ }
+
+ if (!asn1_end_tag(data)) goto err;
+
+ ret = !asn1_has_error(data);
+
+ err:
+
+ asn1_free(data);
+
+ return ret;
+}
/**
* Next state function for the Krb5 GENSEC mechanism
static NTSTATUS gensec_krb5_update(struct gensec_security *gensec_security,
TALLOC_CTX *out_mem_ctx,
+ struct tevent_context *ev,
const DATA_BLOB in, DATA_BLOB *out)
{
struct gensec_krb5_state *gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
{
DATA_BLOB unwrapped_out;
+ nt_status = gensec_krb5_common_client_creds(gensec_security, ev, gensec_krb5_state->gssapi);
+ if (!NT_STATUS_IS_OK(nt_status)) {
+ return nt_status;
+ }
+
if (gensec_krb5_state->gssapi) {
unwrapped_out = data_blob_talloc(out_mem_ctx, gensec_krb5_state->enc_ticket.data, gensec_krb5_state->enc_ticket.length);
return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
}
- /* This ensures we lookup the correct entry in that keytab */
+ /* This ensures we lookup the correct entry in that
+ * keytab. A NULL principal is acceptable, and means
+ * that the krb5 libs should search the keytab at
+ * accept time for any matching key */
ret = principal_from_credentials(out_mem_ctx, gensec_get_credentials(gensec_security),
gensec_krb5_state->smb_krb5_context,
&server_in_keytab, &obtained, &error_string);
return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
}
+ if (keytab->password_based || obtained < CRED_SPECIFIED) {
+ /*
+ * Use match-by-key in this case (matches
+ * cli_credentials_get_server_gss_creds()
+ * behaviour). No need to free the memory,
+ * this is handled with a talloc destructor.
+ */
+ server_in_keytab = NULL;
+ }
+
/* Parse the GSSAPI wrapping, if it's there... (win2k3 allows it to be omited) */
if (gensec_krb5_state->gssapi
&& gensec_gssapi_parse_krb5_wrap(out_mem_ctx, &in, &unwrapped_in, tok_id)) {
}
static NTSTATUS gensec_krb5_session_key(struct gensec_security *gensec_security,
+ TALLOC_CTX *mem_ctx,
DATA_BLOB *session_key)
{
struct gensec_krb5_state *gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
return NT_STATUS_NO_USER_SESSION_KEY;
}
- if (gensec_krb5_state->session_key.data) {
- *session_key = gensec_krb5_state->session_key;
- return NT_STATUS_OK;
- }
-
switch (gensec_security->gensec_role) {
case GENSEC_CLIENT:
err = krb5_auth_con_getlocalsubkey(context, auth_context, &skey);
if (err == 0 && skey != NULL) {
DEBUG(10, ("Got KRB5 session key of length %d\n",
(int)KRB5_KEY_LENGTH(skey)));
- gensec_krb5_state->session_key = data_blob_talloc(gensec_krb5_state,
- KRB5_KEY_DATA(skey), KRB5_KEY_LENGTH(skey));
- *session_key = gensec_krb5_state->session_key;
+ *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);
krb5_free_keyblock(context, skey);
}
static NTSTATUS gensec_krb5_session_info(struct gensec_security *gensec_security,
+ TALLOC_CTX *mem_ctx,
struct auth_session_info **_session_info)
{
NTSTATUS nt_status = NT_STATUS_UNSUCCESSFUL;
struct gensec_krb5_state *gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
krb5_context context = gensec_krb5_state->smb_krb5_context->krb5_context;
- struct auth_serversupplied_info *server_info = NULL;
struct auth_session_info *session_info = NULL;
- struct PAC_LOGON_INFO *logon_info;
krb5_principal client_principal;
char *principal_string;
- DATA_BLOB pac;
+ DATA_BLOB pac_blob, *pac_blob_ptr = NULL;
krb5_data pac_data;
krb5_error_code ret;
- TALLOC_CTX *mem_ctx = talloc_new(gensec_security);
- if (!mem_ctx) {
+ TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
+ if (!tmp_ctx) {
return NT_STATUS_NO_MEMORY;
}
if (ret) {
DEBUG(5, ("krb5_ticket_get_client failed to get cleint principal: %s\n",
smb_get_krb5_error_message(context,
- ret, mem_ctx)));
- talloc_free(mem_ctx);
+ ret, tmp_ctx)));
+ talloc_free(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
if (ret) {
DEBUG(1, ("Unable to parse client principal: %s\n",
smb_get_krb5_error_message(context,
- ret, mem_ctx)));
- talloc_free(mem_ctx);
+ ret, tmp_ctx)));
+ krb5_free_principal(context, client_principal);
+ talloc_free(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
KRB5_AUTHDATA_WIN2K_PAC,
&pac_data);
- if (ret && gensec_setting_bool(gensec_security->settings, "gensec", "require_pac", false)) {
- DEBUG(1, ("Unable to find PAC in ticket from %s, failing to allow access: %s \n",
- principal_string,
- smb_get_krb5_error_message(context,
- ret, mem_ctx)));
- krb5_free_principal(context, client_principal);
- free(principal_string);
- return NT_STATUS_ACCESS_DENIED;
- } else if (ret) {
+ if (ret) {
/* NO pac */
DEBUG(5, ("krb5_ticket_get_authorization_data_type failed to find PAC: %s\n",
smb_get_krb5_error_message(context,
- ret, mem_ctx)));
- if (gensec_security->auth_context &&
- !gensec_setting_bool(gensec_security->settings, "gensec", "require_pac", false)) {
- DEBUG(1, ("Unable to find PAC for %s, resorting to local user lookup: %s",
- principal_string, smb_get_krb5_error_message(context,
- ret, mem_ctx)));
- nt_status = gensec_security->auth_context->get_server_info_principal(mem_ctx,
- gensec_security->auth_context,
- principal_string,
- NULL, &server_info);
- if (!NT_STATUS_IS_OK(nt_status)) {
- talloc_free(mem_ctx);
- return nt_status;
- }
- } else {
- DEBUG(1, ("Unable to find PAC in ticket from %s, failing to allow access\n",
- principal_string));
- free(principal_string);
- krb5_free_principal(context, client_principal);
- talloc_free(mem_ctx);
- return NT_STATUS_ACCESS_DENIED;
- }
+ ret, tmp_ctx)));
} else {
/* Found pac */
- union netr_Validation validation;
- free(principal_string);
-
- pac = data_blob_talloc(mem_ctx, pac_data.data, pac_data.length);
- if (!pac.data) {
+ pac_blob = data_blob_talloc(tmp_ctx, pac_data.data, pac_data.length);
+ kerberos_free_data_contents(context, &pac_data);
+ if (!pac_blob.data) {
+ free(principal_string);
krb5_free_principal(context, client_principal);
- talloc_free(mem_ctx);
+ talloc_free(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
/* decode and verify the pac */
- nt_status = kerberos_pac_logon_info(gensec_krb5_state,
- &logon_info, pac,
- gensec_krb5_state->smb_krb5_context->krb5_context,
- NULL, gensec_krb5_state->keyblock,
- client_principal,
- gensec_krb5_state->ticket->ticket.authtime, NULL);
- krb5_free_principal(context, client_principal);
+ nt_status = kerberos_decode_pac(gensec_krb5_state,
+ pac_blob,
+ gensec_krb5_state->smb_krb5_context->krb5_context,
+ NULL, gensec_krb5_state->keyblock,
+ client_principal,
+ gensec_krb5_state->ticket->ticket.authtime, NULL);
if (!NT_STATUS_IS_OK(nt_status)) {
- talloc_free(mem_ctx);
+ free(principal_string);
+ krb5_free_principal(context, client_principal);
+ talloc_free(tmp_ctx);
return nt_status;
}
- validation.sam3 = &logon_info->info3;
- nt_status = make_server_info_netlogon_validation(mem_ctx,
- NULL,
- 3, &validation,
- &server_info);
- if (!NT_STATUS_IS_OK(nt_status)) {
- talloc_free(mem_ctx);
- return nt_status;
- }
+ pac_blob_ptr = &pac_blob;
}
- /* references the server_info into the session_info */
- nt_status = gensec_generate_session_info(mem_ctx, gensec_security, server_info, &session_info);
+ nt_status = gensec_generate_session_info_pac(tmp_ctx,
+ gensec_security,
+ gensec_krb5_state->smb_krb5_context,
+ pac_blob_ptr, principal_string,
+ gensec_get_remote_address(gensec_security),
+ &session_info);
+
+ free(principal_string);
+ krb5_free_principal(context, client_principal);
if (!NT_STATUS_IS_OK(nt_status)) {
- talloc_free(mem_ctx);
+ talloc_free(tmp_ctx);
return nt_status;
}
- nt_status = gensec_krb5_session_key(gensec_security, &session_info->session_key);
+ nt_status = gensec_krb5_session_key(gensec_security, session_info, &session_info->session_key);
if (!NT_STATUS_IS_OK(nt_status)) {
- talloc_free(mem_ctx);
+ talloc_free(tmp_ctx);
return nt_status;
}
- *_session_info = session_info;
+ *_session_info = talloc_steal(mem_ctx, session_info);
- talloc_steal(gensec_krb5_state, session_info);
- talloc_free(mem_ctx);
+ talloc_free(tmp_ctx);
return NT_STATUS_OK;
}
.client_start = gensec_fake_gssapi_krb5_client_start,
.server_start = gensec_fake_gssapi_krb5_server_start,
.update = gensec_krb5_update,
- .magic = gensec_fake_gssapi_krb5_magic,
+ .magic = gensec_magic_check_krb5_oid,
.session_key = gensec_krb5_session_key,
.session_info = gensec_krb5_session_info,
.have_feature = gensec_krb5_have_feature,
ret = gensec_register(&gensec_fake_gssapi_krb5_security_ops);
if (!NT_STATUS_IS_OK(ret)) {
DEBUG(0,("Failed to register '%s' gensec backend!\n",
- gensec_krb5_security_ops.name));
+ gensec_fake_gssapi_krb5_security_ops.name));
return ret;
}
git.samba.org / samba.git / blobdiff