ncacn_http: Authentication modules for http library
authorSamuel Cabrero <samuelcabrero@kernevil.me>
Tue, 16 Sep 2014 16:05:53 +0000 (18:05 +0200)
committerStefan Metzmacher <metze@samba.org>
Mon, 22 Sep 2014 21:09:08 +0000 (23:09 +0200)
Signed-off-by: Samuel Cabrero <samuelcabrero@kernevil.me>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
source4/lib/http/gensec/basic.c [new file with mode: 0644]
source4/lib/http/gensec/ntlm.c [new file with mode: 0644]
source4/lib/http/http.h
source4/lib/http/http_auth.c [new file with mode: 0644]
source4/lib/http/wscript_build

diff --git a/source4/lib/http/gensec/basic.c b/source4/lib/http/gensec/basic.c
new file mode 100644 (file)
index 0000000..86a2d51
--- /dev/null
@@ -0,0 +1,137 @@
+/*
+   Unix SMB/CIFS implementation.
+
+   HTTP library - Basic authentication mechanism gensec module
+
+   Copyright (C) 2014 Samuel Cabrero <samuelcabrero@kernevil.me>
+
+   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 "auth/auth.h"
+#include "auth/gensec/gensec.h"
+#include "auth/gensec/gensec_internal.h"
+#include "auth/credentials/credentials.h"
+
+_PUBLIC_ NTSTATUS gensec_http_basic_init(void);
+
+struct gensec_http_basic_state {
+       enum {
+               GENSEC_HTTP_BASIC_START,
+               GENSEC_HTTP_BASIC_DONE,
+               GENSEC_HTTP_BASIC_ERROR,
+       } step;
+};
+
+static NTSTATUS gensec_http_basic_client_start(struct gensec_security *gensec)
+{
+       struct gensec_http_basic_state *state;
+
+       state = talloc_zero(gensec, struct gensec_http_basic_state);
+       if (state == NULL) {
+               return NT_STATUS_NO_MEMORY;
+       }
+       gensec->private_data = state;
+
+       state->step = GENSEC_HTTP_BASIC_START;
+
+       return NT_STATUS_OK;
+}
+
+static NTSTATUS gensec_http_basic_update(struct gensec_security *gensec_ctx,
+                                        TALLOC_CTX *mem_ctx,
+                                        struct tevent_context *ev,
+                                        const DATA_BLOB in,
+                                        DATA_BLOB *out)
+{
+       struct gensec_http_basic_state *state;
+       struct cli_credentials *creds;
+       char *tmp, *b64;
+
+       state = talloc_get_type_abort(gensec_ctx->private_data,
+                                     struct gensec_http_basic_state);
+       creds = gensec_get_credentials(gensec_ctx);
+
+       switch (gensec_ctx->gensec_role) {
+       case GENSEC_CLIENT:
+               switch (state->step) {
+               case GENSEC_HTTP_BASIC_START:
+                       tmp = talloc_asprintf(mem_ctx, "%s\\%s:%s",
+                                       cli_credentials_get_domain(creds),
+                                       cli_credentials_get_username(creds),
+                                       cli_credentials_get_password(creds));
+                       if (tmp == NULL) {
+                               state->step = GENSEC_HTTP_BASIC_ERROR;
+                               return NT_STATUS_NO_MEMORY;
+                       }
+                       *out = data_blob_string_const(tmp);
+
+                       b64 = base64_encode_data_blob(mem_ctx, *out);
+                       if (b64 == NULL) {
+                               state->step = GENSEC_HTTP_BASIC_ERROR;
+                               return NT_STATUS_NO_MEMORY;
+                       }
+                       TALLOC_FREE(tmp);
+
+                       tmp = talloc_asprintf(mem_ctx, "Basic %s", b64);
+                       if (tmp == NULL) {
+                               state->step = GENSEC_HTTP_BASIC_ERROR;
+                               return NT_STATUS_NO_MEMORY;
+                       }
+                       TALLOC_FREE(b64);
+
+                       *out = data_blob_string_const(tmp);
+                       state->step = GENSEC_HTTP_BASIC_DONE;
+                       return NT_STATUS_OK;
+
+               case GENSEC_HTTP_BASIC_DONE:
+               case GENSEC_HTTP_BASIC_ERROR:
+               default:
+                       break;
+               }
+               state->step = GENSEC_HTTP_BASIC_ERROR;
+               return NT_STATUS_INTERNAL_ERROR;
+
+       case GENSEC_SERVER:
+               state->step = GENSEC_HTTP_BASIC_ERROR;
+               return NT_STATUS_NOT_IMPLEMENTED;
+       }
+
+       state->step = GENSEC_HTTP_BASIC_ERROR;
+       return NT_STATUS_INTERNAL_ERROR;
+}
+
+static const struct gensec_security_ops gensec_http_basic_security_ops = {
+       .name           = "http_basic",
+       .auth_type      = 0,
+       .client_start   = gensec_http_basic_client_start,
+       .update         = gensec_http_basic_update,
+       .enabled        = true,
+       .priority       = GENSEC_EXTERNAL,
+};
+
+_PUBLIC_ NTSTATUS gensec_http_basic_init(void)
+{
+       NTSTATUS status;
+
+       status = gensec_register(&gensec_http_basic_security_ops);
+       if (!NT_STATUS_IS_OK(status)) {
+               DEBUG(0, ("Failed to register '%s' gensec backend!\n",
+                               gensec_http_basic_security_ops.name));
+               return status;
+       }
+
+       return status;
+}
diff --git a/source4/lib/http/gensec/ntlm.c b/source4/lib/http/gensec/ntlm.c
new file mode 100644 (file)
index 0000000..07470fa
--- /dev/null
@@ -0,0 +1,120 @@
+/*
+   Unix SMB/CIFS implementation.
+
+   HTTP library - NTLM authentication mechanism gensec module
+
+   Copyright (C) 2014 Samuel Cabrero <samuelcabrero@kernevil.me>
+
+   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 "auth/auth.h"
+#include "auth/gensec/gensec.h"
+#include "auth/gensec/gensec_internal.h"
+
+_PUBLIC_ NTSTATUS gensec_http_ntlm_init(void);
+
+struct gensec_http_ntlm_state {
+       struct gensec_security *sub;
+};
+
+static NTSTATUS gensec_http_ntlm_client_start(struct gensec_security *gensec)
+{
+       NTSTATUS status;
+       struct gensec_http_ntlm_state *state;
+
+       state = talloc_zero(gensec, struct gensec_http_ntlm_state);
+       if (state == NULL) {
+               return NT_STATUS_NO_MEMORY;
+       }
+       gensec->private_data = state;
+
+       status = gensec_subcontext_start(state, gensec, &state->sub);
+       if (!NT_STATUS_IS_OK(status)) {
+               return status;
+       }
+
+       return gensec_start_mech_by_oid(state->sub, GENSEC_OID_NTLMSSP);
+}
+
+static NTSTATUS gensec_http_ntlm_update(struct gensec_security *gensec_ctx,
+                                       TALLOC_CTX *mem_ctx,
+                                       struct tevent_context *ev,
+                                       const DATA_BLOB in,
+                                       DATA_BLOB *out)
+{
+       NTSTATUS status;
+       struct gensec_http_ntlm_state *state;
+       DATA_BLOB ntlm_in;
+
+       state = talloc_get_type_abort(gensec_ctx->private_data,
+                                     struct gensec_http_ntlm_state);
+
+       if (in.length) {
+               if (strncasecmp((char *)in.data, "NTLM ", 5) != 0) {
+                       return NT_STATUS_INVALID_PARAMETER;
+               }
+               ntlm_in = base64_decode_data_blob_talloc(mem_ctx,
+                                                        (char *)&in.data[5]);
+       } else {
+               ntlm_in = data_blob_null;
+       }
+
+       status = gensec_update_ev(state->sub, mem_ctx, ev, ntlm_in, out);
+       if (NT_STATUS_IS_OK(status) ||
+           NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
+               char *tmp, *b64;
+               b64 = base64_encode_data_blob(mem_ctx, *out);
+               if (b64 == NULL) {
+                       return NT_STATUS_NO_MEMORY;
+               }
+
+               tmp = talloc_asprintf(mem_ctx, "NTLM %s", b64);
+               TALLOC_FREE(b64);
+               if (tmp == NULL) {
+                       return NT_STATUS_NO_MEMORY;
+               }
+               *out = data_blob_string_const(tmp);
+       }
+
+       if (ntlm_in.data) {
+               data_blob_free(&ntlm_in);
+       }
+
+       return status;
+}
+
+static const struct gensec_security_ops gensec_http_ntlm_security_ops = {
+       .name           = "http_ntlm",
+       .auth_type      = 0,
+       .client_start   = gensec_http_ntlm_client_start,
+       .update         = gensec_http_ntlm_update,
+       .enabled        = true,
+       .priority       = GENSEC_EXTERNAL,
+};
+
+_PUBLIC_ NTSTATUS gensec_http_ntlm_init(void)
+{
+       NTSTATUS status;
+
+       status = gensec_register(&gensec_http_ntlm_security_ops);
+       if (!NT_STATUS_IS_OK(status)) {
+               DEBUG(0, ("Failed to register '%s' gensec backend!\n",
+                               gensec_http_ntlm_security_ops.name));
+               return status;
+       }
+
+       return status;
+}
index 671f383..75a04b1 100644 (file)
@@ -63,10 +63,8 @@ enum http_cmd_type {
 };
 
 enum http_auth_method {
-       HTTP_AUTH_AUTO,
-       HTTP_AUTH_BASIC,
+       HTTP_AUTH_BASIC=1,
        HTTP_AUTH_NTLM,
-       HTTP_AUTH_NEGOTIATE,
 };
 
 struct http_header {
@@ -108,4 +106,15 @@ NTSTATUS http_read_response_recv(struct tevent_req *,
                            TALLOC_CTX *,
                            struct http_request **);
 
+/* HTTP authenticated request */
+struct tevent_req *http_send_auth_request_send(TALLOC_CTX *,
+                                              struct tevent_context *,
+                                              struct tstream_context *,
+                                              struct tevent_queue *,
+                                              struct http_request *,
+                                              struct cli_credentials *,
+                                              struct loadparm_context *,
+                                              enum http_auth_method);
+NTSTATUS http_send_auth_request_recv(struct tevent_req *);
+
 #endif /* _HTTP_H_ */
diff --git a/source4/lib/http/http_auth.c b/source4/lib/http/http_auth.c
new file mode 100644 (file)
index 0000000..2bf4392
--- /dev/null
@@ -0,0 +1,361 @@
+/*
+   Unix SMB/CIFS implementation.
+
+   HTTP library
+
+   Copyright (C) 2014 Samuel Cabrero <samuelcabrero@kernevil.me>
+
+   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 "http.h"
+#include "http_internal.h"
+#include "lib/util/tevent_ntstatus.h"
+#include "lib/param/param.h"
+#include "tevent.h"
+#include "auth/gensec/gensec.h"
+#include "auth/credentials/credentials.h"
+#include "lib/util/data_blob.h"
+
+/**
+ * Copy the request headers from src to dst
+ */
+static NTSTATUS http_copy_header(struct http_request *src,
+                                struct http_request *dst)
+{
+       struct http_header *h;
+
+       dst->type = src->type;
+       dst->major = src->major;
+       dst->minor = src->minor;
+       dst->uri = talloc_strdup(dst, src->uri);
+
+       for (h = src->headers; h != NULL; h = h->next) {
+               http_add_header(dst, &dst->headers, h->key, h->value);
+       }
+       dst->headers_size = src->headers_size;
+
+       return NT_STATUS_OK;
+}
+
+/*
+ * Retrieve the WWW-Authenticate header from server response based on the
+ * authentication scheme being used.
+ */
+static NTSTATUS http_parse_auth_response(enum http_auth_method auth,
+                                        struct http_request *auth_response,
+                                        DATA_BLOB *in)
+{
+       struct http_header *h;
+
+       for (h = auth_response->headers; h != NULL; h = h->next) {
+               if (strncasecmp(h->key, "WWW-Authenticate", 16) == 0) {
+                       switch (auth) {
+                       case HTTP_AUTH_NTLM:
+                               if (strncasecmp(h->value, "NTLM ", 5) == 0) {
+                                       *in = data_blob_string_const(h->value);
+                                       return NT_STATUS_OK;
+                               }
+                               break;
+                       default:
+                               break;
+                       }
+               }
+       }
+
+       return NT_STATUS_NOT_SUPPORTED;
+}
+
+/*
+ * Create the next authentication request to send to server if authentication
+ * is not completed. If it is completed, attachs the 'Authorization' header
+ * to the original request.
+ */
+static NTSTATUS http_create_auth_request(TALLOC_CTX *mem_ctx,
+                                        struct gensec_security *gensec_ctx,
+                                        struct tevent_context *ev,
+                                        enum http_auth_method auth,
+                                        struct http_request *original_request,
+                                        struct http_request *auth_response,
+                                        struct http_request **auth_request)
+{
+       NTSTATUS status;
+       DATA_BLOB in, out;
+
+       if (auth_response) {
+               status = http_parse_auth_response(auth, auth_response, &in);
+       } else {
+               in = data_blob_null;
+       }
+
+       status = gensec_update_ev(gensec_ctx, mem_ctx, ev, in, &out);
+       if (NT_STATUS_IS_OK(status)) {
+               if (out.length) {
+                       http_add_header(original_request,
+                                       &original_request->headers,
+                                       "Authorization", (char*)out.data);
+               }
+       }
+
+       if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
+               NTSTATUS status2;
+
+               *auth_request = talloc_zero(mem_ctx, struct http_request);
+               if (*auth_request == NULL) {
+                       return NT_STATUS_NO_MEMORY;
+               }
+
+               status2 = http_copy_header(original_request, *auth_request);
+               if (!NT_STATUS_IS_OK(status2)) {
+                       talloc_free(*auth_request);
+                       return status2;
+               }
+
+               http_replace_header(*auth_request, &((*auth_request)->headers),
+                                   "Content-Length", "0");
+               if (out.length) {
+                       http_add_header(*auth_request,
+                                       &((*auth_request)->headers),
+                                       "Authorization", (char*)out.data);
+               }
+       }
+
+       return status;
+}
+
+struct http_auth_state
+{
+       struct loadparm_context *lp_ctx;
+       struct tevent_context   *ev;
+       struct tstream_context  *stream;
+       struct tevent_queue     *send_queue;
+       struct cli_credentials  *credentials;
+       struct http_request     *original_request;
+       struct gensec_security  *gensec_ctx;
+       NTSTATUS                gensec_status;
+       enum http_auth_method   auth;
+
+       int                     sys_errno;
+       int                     nwritten;
+};
+
+
+static void http_send_auth_request_done(struct tevent_req *);
+struct tevent_req *http_send_auth_request_send(TALLOC_CTX *mem_ctx,
+                                              struct tevent_context *ev,
+                                              struct tstream_context *stream,
+                                              struct tevent_queue *send_queue,
+                                              struct http_request *original_request,
+                                              struct cli_credentials *credentials,
+                                              struct loadparm_context *lp_ctx,
+                                              enum http_auth_method auth)
+{
+       struct tevent_req *req;
+       struct tevent_req *subreq;
+       struct http_auth_state *state;
+       NTSTATUS status;
+       struct http_request *auth_request;
+       struct http_request *request_to_send;
+
+       req = tevent_req_create(mem_ctx, &state, struct http_auth_state);
+       if (req == NULL) {
+               return NULL;
+       }
+
+       state->ev = ev;
+       state->stream = stream;
+       state->send_queue = send_queue;
+       state->original_request = original_request;
+       state->credentials = credentials;
+       state->lp_ctx = lp_ctx;
+       state->auth = auth;
+
+       status = gensec_init();
+       if (!NT_STATUS_IS_OK(status)) {
+               goto post_status;
+       }
+       status = gensec_client_start(state, &state->gensec_ctx,
+                                    lpcfg_gensec_settings(state, lp_ctx));
+       if (!NT_STATUS_IS_OK(status)) {
+               goto post_status;
+       }
+       status = gensec_set_credentials(state->gensec_ctx, credentials);
+       if (!NT_STATUS_IS_OK(status)) {
+               goto post_status;
+       }
+
+       switch (state->auth) {
+       case HTTP_AUTH_BASIC:
+               status = gensec_start_mech_by_name(state->gensec_ctx,
+                                                  "http_basic");
+               if (!NT_STATUS_IS_OK(status)) {
+                       goto post_status;
+               }
+               break;
+       case HTTP_AUTH_NTLM:
+               status = gensec_start_mech_by_name(state->gensec_ctx,
+                                                  "http_ntlm");
+               if (!NT_STATUS_IS_OK(status)) {
+                       goto post_status;
+               }
+               break;
+       default:
+               tevent_req_nterror(req, NT_STATUS_NOT_SUPPORTED);
+               return tevent_req_post(req, ev);
+       }
+
+       /*
+        * Store the gensec status to read the server response on callback
+        * if more processing is required
+       */
+       state->gensec_status = http_create_auth_request(state,
+                                                       state->gensec_ctx,
+                                                       state->ev,
+                                                       state->auth,
+                                                       state->original_request,
+                                                       NULL,
+                                                       &auth_request);
+       if (!NT_STATUS_IS_OK(state->gensec_status) &&
+           !NT_STATUS_EQUAL(state->gensec_status,
+                            NT_STATUS_MORE_PROCESSING_REQUIRED)) {
+               goto post_status;
+       }
+
+       /*
+        * If no more processing is necessary, the http_create_auth_request
+        * function will attach the authentication header to the original
+        * request
+        */
+       request_to_send = NT_STATUS_IS_OK(state->gensec_status) ?
+                               state->original_request : auth_request;
+
+       subreq = http_send_request_send(state, ev, stream, send_queue,
+                                       request_to_send);
+       if (tevent_req_nomem(subreq, req)) {
+               return tevent_req_post(req, ev);
+       }
+       tevent_req_set_callback(subreq, http_send_auth_request_done, req);
+       return req;
+post_status:
+       tevent_req_nterror(req, status);
+       return tevent_req_post(req, ev);
+}
+
+static void http_send_auth_request_done2(struct tevent_req *subreq);
+static void http_send_auth_request_done(struct tevent_req *subreq)
+{
+       NTSTATUS                status;
+       struct tevent_req       *req;
+       struct http_auth_state  *state;
+
+       req = tevent_req_callback_data(subreq, struct tevent_req);
+       state = tevent_req_data(req, struct http_auth_state);
+
+       status = http_send_request_recv(subreq);
+       TALLOC_FREE(subreq);
+       if (tevent_req_nterror(req, status)) {
+               return;
+       }
+
+       /* If no more processing required, it is done */
+       if (NT_STATUS_IS_OK(state->gensec_status)) {
+               tevent_req_done(req);
+               return;
+       }
+
+       /* If more processing required, read the response from server */
+       if (NT_STATUS_EQUAL(state->gensec_status,
+                           NT_STATUS_MORE_PROCESSING_REQUIRED)) {
+               subreq = http_read_response_send(state, state->ev,
+                                                state->stream);
+               if (tevent_req_nomem(subreq, req)) {
+                       return;
+               }
+               tevent_req_set_callback(subreq, http_send_auth_request_done2,
+                                       req);
+               return;
+       }
+
+       /*
+        * If gensec status is not NT_STATUS_OK neither
+        * NT_STATUS_MORE_PROCESSING_REQUIRED , it is an error
+        */
+       tevent_req_nterror(req, state->gensec_status);
+}
+
+static void http_send_auth_request_done2(struct tevent_req *subreq)
+{
+       NTSTATUS status;
+       struct tevent_req       *req;
+       struct http_auth_state  *state;
+       struct http_request *auth_response;
+       struct http_request *auth_request;
+       struct http_request *request_to_send;
+
+       req = tevent_req_callback_data(subreq, struct tevent_req);
+       state = tevent_req_data(req, struct http_auth_state);
+
+       status = http_read_response_recv(subreq, state, &auth_response);
+       TALLOC_FREE(subreq);
+       if (tevent_req_nterror(req, status)) {
+               return;
+       }
+
+       state->gensec_status = http_create_auth_request(state,
+                                                       state->gensec_ctx,
+                                                       state->ev,
+                                                       state->auth,
+                                                       state->original_request,
+                                                       auth_response,
+                                                       &auth_request);
+       if (!NT_STATUS_IS_OK(state->gensec_status) &&
+           !NT_STATUS_EQUAL(state->gensec_status,
+                            NT_STATUS_MORE_PROCESSING_REQUIRED)) {
+               tevent_req_nterror(req, status);
+               return;
+       }
+
+       /*
+        * If no more processing is necessary, the http_create_auth_request
+        * function will attach the authentication header to the original
+        * request
+        */
+       request_to_send = NT_STATUS_IS_OK(state->gensec_status) ?
+                               state->original_request : auth_request;
+
+       subreq = http_send_request_send(state,
+                                       state->ev,
+                                       state->stream,
+                                       state->send_queue,
+                                       request_to_send);
+       if (tevent_req_nomem(subreq, req)) {
+               return;
+       }
+       tevent_req_set_callback(subreq, http_send_auth_request_done, req);
+}
+
+
+NTSTATUS http_send_auth_request_recv(struct tevent_req *req)
+{
+       NTSTATUS status;
+
+       if (tevent_req_is_nterror(req, &status)) {
+               tevent_req_received(req);
+               return status;
+       }
+       tevent_req_received(req);
+
+       return NT_STATUS_OK;
+}
index 61f4070..e18d853 100644 (file)
@@ -1,7 +1,21 @@
 #!/usr/bin/env python
 
 bld.SAMBA_LIBRARY('http',
-       source='http.c',
+       source='http.c http_auth.c',
        deps='talloc tevent samba3core',
        private_library=True,
 )
+
+bld.SAMBA_MODULE('gensec_http_basic',
+       source='gensec/basic.c',
+       subsystem='gensec',
+       init_function='gensec_http_basic_init',
+       deps='samba-util auth_session'
+)
+
+bld.SAMBA_MODULE('gensec_http_ntlm',
+       source='gensec/ntlm.c',
+       subsystem='gensec',
+       init_function='gensec_http_ntlm_init',
+       deps='samba-util auth_session'
+)