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-rw-r--r--source4/web_server/http.c627
1 files changed, 627 insertions, 0 deletions
diff --git a/source4/web_server/http.c b/source4/web_server/http.c
new file mode 100644
index 0000000000..ad7eaa8ead
--- /dev/null
+++ b/source4/web_server/http.c
@@ -0,0 +1,627 @@
+/*
+ Unix SMB/CIFS implementation.
+
+ http handling code
+
+ Copyright (C) Andrew Tridgell 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 2 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, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+#include "web_server/web_server.h"
+#include "smbd/service_stream.h"
+#include "lib/events/events.h"
+#include "system/filesys.h"
+#include "system/iconv.h"
+#include "system/time.h"
+#include "web_server/esp/esp.h"
+
+/* state of the esp subsystem */
+struct esp_state {
+ struct websrv_context *web;
+ struct MprVar variables[ESP_OBJ_MAX];
+ struct EspRequest *req;
+};
+
+/* destroy a esp session */
+static int esp_destructor(void *ptr)
+{
+ struct esp_state *esp = talloc_get_type(ptr, struct esp_state);
+ if (esp->req) {
+ espDestroyRequest(esp->req);
+ }
+ espClose();
+ mprFreeAll();
+ return 0;
+}
+
+/*
+ output the http headers
+*/
+static void http_output_headers(struct websrv_context *web)
+{
+ int i;
+ char *s;
+ DATA_BLOB b;
+ const char *response_string = "Unknown Code";
+ const struct {
+ unsigned code;
+ const char *response_string;
+ } codes[] = {
+ { 200, "OK" },
+ { 301, "Moved" },
+ { 302, "Found" },
+ { 303, "Method" },
+ { 304, "Not Modified" },
+ { 400, "Bad request" },
+ { 401, "Unauthorized" },
+ { 403, "Forbidden" },
+ { 404, "Not Found" },
+ { 500, "Internal Server Error" },
+ { 501, "Not implemented" }
+ };
+ for (i=0;i<ARRAY_SIZE(codes);i++) {
+ if (codes[i].code == web->output.response_code) {
+ response_string = codes[i].response_string;
+ }
+ }
+
+ if (web->output.headers == NULL) return;
+ s = talloc_asprintf(web, "HTTP/1.0 %u %s\r\n",
+ web->output.response_code, response_string);
+ if (s == NULL) return;
+ for (i=0;web->output.headers[i];i++) {
+ s = talloc_asprintf_append(s, "%s\r\n", web->output.headers[i]);
+ }
+ s = talloc_asprintf_append(s, "\r\n");
+ if (s == NULL) return;
+
+ b = web->output.content;
+ web->output.content.data = s;
+ web->output.content.length = strlen(s);
+ data_blob_append(web, &web->output.content, b.data, b.length);
+ data_blob_free(&b);
+}
+
+/*
+ called when esp wants to output something
+*/
+static int http_writeBlock(EspHandle handle, char *buf, int size)
+{
+ struct websrv_context *web = talloc_get_type(handle, struct websrv_context);
+ NTSTATUS status;
+ status = data_blob_append(web, &web->output.content, buf, size);
+ if (!NT_STATUS_IS_OK(status)) return -1;
+ return size;
+}
+
+
+/*
+ set a http header
+*/
+static void http_setHeader(EspHandle handle, const char *value, bool allowMultiple)
+{
+ struct websrv_context *web = talloc_get_type(handle, struct websrv_context);
+ char *p = strchr(value, ':');
+
+ if (p && !allowMultiple && web->output.headers) {
+ int i;
+ for (i=0;web->output.headers[i];i++) {
+ if (strncmp(web->output.headers[i], value, (p+1)-value) == 0) {
+ web->output.headers[i] = talloc_strdup(web, value);
+ return;
+ }
+ }
+ }
+
+ web->output.headers = str_list_add(web->output.headers, value);
+}
+
+/*
+ set a http response code
+*/
+static void http_setResponseCode(EspHandle handle, int code)
+{
+ struct websrv_context *web = talloc_get_type(handle, struct websrv_context);
+ web->output.response_code = code;
+}
+
+/*
+ redirect to another web page
+ */
+static void http_redirect(EspHandle handle, int code, char *url)
+{
+ struct websrv_context *web = talloc_get_type(handle, struct websrv_context);
+ const char *host = web->input.host;
+
+ /* form the full url, unless it already looks like a url */
+ if (strchr(url, ':') == NULL) {
+ if (host == NULL) {
+ host = talloc_asprintf(web, "%s:%u",
+ socket_get_my_addr(web->conn->socket, web),
+ socket_get_my_port(web->conn->socket));
+ }
+ if (host == NULL) goto internal_error;
+ if (url[0] != '/') {
+ char *p = strrchr(web->input.url, '/');
+ if (p == web->input.url) {
+ url = talloc_asprintf(web, "http://%s/%s", host, url);
+ } else {
+ int dirlen = p - web->input.url;
+ url = talloc_asprintf(web, "http://%s%*.*s/%s",
+ host,
+ dirlen, dirlen, web->input.url,
+ url);
+ }
+ if (url == NULL) goto internal_error;
+ }
+ }
+
+ http_setHeader(handle, talloc_asprintf(web, "Location: %s", url), 0);
+
+ /* make sure we give a valid redirect code */
+ if (code >= 300 && code < 400) {
+ http_setResponseCode(handle, code);
+ } else {
+ http_setResponseCode(handle, 302);
+ }
+ return;
+
+internal_error:
+ http_error(web, 500, "Internal server error");
+}
+
+
+/* callbacks for esp processing */
+static const struct Esp esp_control = {
+ .maxScriptSize = 60000,
+ .writeBlock = http_writeBlock,
+ .setHeader = http_setHeader,
+ .redirect = http_redirect,
+ .setResponseCode = http_setResponseCode
+};
+
+
+/*
+ setup for a raw http level error
+*/
+void http_error(struct websrv_context *web, int code, const char *info)
+{
+ char *s;
+ s = talloc_asprintf(web,"<HTML><HEAD><TITLE>Error %u</TITLE></HEAD><BODY><H1>Error %u</H1>%s<p></BODY></HTML>\r\n\r\n",
+ code, code, info);
+ if (s == NULL) {
+ stream_terminate_connection(web->conn, "http_error: out of memory");
+ return;
+ }
+ http_writeBlock(web, s, strlen(s));
+ http_setResponseCode(web, code);
+ http_output_headers(web);
+ EVENT_FD_NOT_READABLE(web->conn->event.fde);
+ EVENT_FD_WRITEABLE(web->conn->event.fde);
+}
+
+/*
+ map a unix error code to a http error
+*/
+void http_error_unix(struct websrv_context *web, const char *info)
+{
+ int code = 500;
+ switch (errno) {
+ case ENOENT:
+ case EISDIR:
+ code = 404;
+ break;
+ case EACCES:
+ code = 403;
+ break;
+ }
+ http_error(web, code, info);
+}
+
+/*
+ return the local path for a URL
+*/
+static const char *http_local_path(struct websrv_context *web, const char *url)
+{
+ int i;
+ char *path;
+
+ /* check that the url is OK */
+ if (url[0] != '/') return NULL;
+
+ for (i=0;url[i];i++) {
+ if ((!isalnum(url[i]) && !strchr("./", url[i])) ||
+ (url[i] == '.' && strchr("/.", url[i+1]))) {
+ return NULL;
+ }
+ }
+
+ path = talloc_asprintf(web, "%s/%s", lp_swat_directory(), url+1);
+ if (path == NULL) return NULL;
+
+ if (directory_exist(path)) {
+ path = talloc_asprintf_append(path, "/index.html");
+ }
+ return path;
+}
+
+
+/*
+ a simple file request
+*/
+static void http_simple_request(struct websrv_context *web)
+{
+ const char *url = web->input.url;
+ const char *path;
+ struct stat st;
+
+ path = http_local_path(web, url);
+ if (path == NULL) goto invalid;
+
+ /* looks ok */
+ web->output.fd = open(path, O_RDONLY);
+ if (web->output.fd == -1) {
+ http_error_unix(web, url);
+ return;
+ }
+
+ if (fstat(web->output.fd, &st) != 0 || !S_ISREG(st.st_mode)) {
+ close(web->output.fd);
+ goto invalid;
+ }
+
+ http_output_headers(web);
+ EVENT_FD_WRITEABLE(web->conn->event.fde);
+ return;
+
+invalid:
+ http_error(web, 400, "Malformed URL");
+}
+
+/*
+ setup the standard ESP arrays
+*/
+static void http_setup_arrays(struct esp_state *esp)
+{
+ struct websrv_context *web = esp->web;
+ struct EspRequest *req = esp->req;
+ char *p;
+
+ espSetStringVar(req, ESP_REQUEST_OBJ, "CONTENT_LENGTH",
+ talloc_asprintf(esp, "%u", web->input.content_length));
+ if (web->input.query_string) {
+ espSetStringVar(req, ESP_REQUEST_OBJ, "QUERY_STRING",
+ web->input.query_string);
+ }
+ espSetStringVar(req, ESP_REQUEST_OBJ, "REQUEST_METHOD",
+ web->input.post_request?"POST":"GET");
+ espSetStringVar(req, ESP_REQUEST_OBJ, "REQUEST_URI", web->input.url);
+ p = strrchr(web->input.url, '/');
+ espSetStringVar(req, ESP_REQUEST_OBJ, "SCRIPT_NAME", p+1);
+
+ if (web->input.referer) {
+ espSetStringVar(req, ESP_HEADERS_OBJ, "HTT_REFERER", web->input.referer);
+ }
+ if (web->input.user_agent) {
+ espSetStringVar(req, ESP_HEADERS_OBJ, "USER_AGENT", web->input.user_agent);
+ }
+
+ espSetStringVar(req, ESP_SERVER_OBJ, "SERVER_ADDR",
+ socket_get_my_addr(web->conn->socket, esp));
+ espSetStringVar(req, ESP_SERVER_OBJ, "SERVER_PORT",
+ talloc_asprintf(esp, "%u", socket_get_my_port(web->conn->socket)));
+ espSetStringVar(req, ESP_SERVER_OBJ, "SERVER_PROTOCOL", "http");
+}
+
+
+
+
+
+/*
+ process a esp request
+*/
+static void esp_request(struct esp_state *esp)
+{
+ struct websrv_context *web = esp->web;
+ const char *url = web->input.url;
+ char *buf;
+ const char *path;
+ struct stat st;
+ int fd, res;
+ char *emsg = NULL;
+
+ http_setup_arrays(esp);
+
+ path = http_local_path(web, url);
+ if (path == NULL) goto invalid;
+
+ espSetStringVar(esp->req, ESP_REQUEST_OBJ, "SCRIPT_FILENAME", path);
+
+ /* looks ok */
+ fd = open(path, O_RDONLY);
+ if (fd == -1) {
+ http_error_unix(web, url);
+ return;
+ }
+
+ if (fstat(fd, &st) != 0 || !S_ISREG(st.st_mode)) {
+ close(fd);
+ goto invalid;
+ }
+
+ buf = talloc_size(esp, st.st_size+1);
+ if (buf == NULL) goto invalid;
+
+ if (read(fd, buf, st.st_size) != st.st_size) {
+ goto invalid;
+ }
+ buf[st.st_size] = 0;
+ close(fd);
+
+ res = espProcessRequest(esp->req, path, buf, &emsg);
+ if (res != 0 && emsg) {
+ http_writeBlock(esp, emsg, strlen(emsg));
+ }
+ http_output_headers(web);
+ EVENT_FD_WRITEABLE(web->conn->event.fde);
+ return;
+
+invalid:
+ http_error(web, 400, "Malformed URL");
+}
+
+
+/*
+ handling of + and % escapes in http variables
+*/
+static const char *http_unescape(TALLOC_CTX *mem_ctx, const char *p)
+{
+ char *s0 = talloc_strdup(mem_ctx, p);
+ char *s = s0;
+ if (s == NULL) return NULL;
+
+ while (*s) {
+ unsigned v;
+ if (*s == '+') *s = ' ';
+ if (*s == '%' && sscanf(s+1, "%02x", &v) == 1) {
+ *s = (char)v;
+ memmove(s+1, s+3, strlen(s+3)+1);
+ }
+ s++;
+ }
+
+ return s0;
+}
+
+/*
+ set a form or GET variable
+*/
+static void esp_putvar(struct esp_state *esp, const char *var, const char *value)
+{
+ espSetStringVar(esp->req, ESP_FORM_OBJ,
+ http_unescape(esp, var),
+ http_unescape(esp, value));
+}
+
+
+/*
+ parse the variables in a POST style request
+*/
+static NTSTATUS http_parse_post(struct esp_state *esp)
+{
+ DATA_BLOB b = esp->web->input.partial;
+
+ while (b.length) {
+ char *p, *line;
+ size_t len;
+
+ p = memchr(b.data, '&', b.length);
+ if (p == NULL) {
+ len = b.length;
+ } else {
+ len = p - (char *)b.data;
+ }
+ line = talloc_strndup(esp, b.data, len);
+ NT_STATUS_HAVE_NO_MEMORY(line);
+
+ p = strchr(line,'=');
+ if (p) {
+ *p = 0;
+ esp_putvar(esp, line, p+1);
+ }
+ talloc_free(line);
+ b.length -= len;
+ b.data += len;
+ if (b.length > 0) {
+ b.length--;
+ b.data++;
+ }
+ }
+
+ return NT_STATUS_OK;
+}
+
+/*
+ parse the variables in a GET style request
+*/
+static NTSTATUS http_parse_get(struct esp_state *esp)
+{
+ struct websrv_context *web = esp->web;
+ char *p, *s, *tok;
+ char *pp;
+
+ p = strchr(web->input.url, '?');
+ web->input.query_string = p+1;
+ *p = 0;
+
+ s = talloc_strdup(esp, esp->web->input.query_string);
+ NT_STATUS_HAVE_NO_MEMORY(s);
+
+ for (tok=strtok_r(s,"&;", &pp);tok;tok=strtok_r(NULL,"&;", &pp)) {
+ p = strchr(tok,'=');
+ if (p) {
+ *p = 0;
+ esp_putvar(esp, tok, p+1);
+ }
+ }
+ return NT_STATUS_OK;
+}
+
+/*
+ setup some standard variables
+*/
+static void http_setup_vars(struct esp_state *esp)
+{
+ int i;
+
+ for (i = 0; i < ESP_OBJ_MAX; i++) {
+ esp->variables[i] = mprCreateUndefinedVar();
+ }
+ esp->variables[ESP_HEADERS_OBJ] = mprCreateObjVar("headers", ESP_HASH_SIZE);
+ esp->variables[ESP_FORM_OBJ] = mprCreateObjVar("form", ESP_HASH_SIZE);
+ esp->variables[ESP_APPLICATION_OBJ] = mprCreateObjVar("application", ESP_HASH_SIZE);
+ esp->variables[ESP_COOKIES_OBJ] = mprCreateObjVar("cookies", ESP_HASH_SIZE);
+ esp->variables[ESP_FILES_OBJ] = mprCreateObjVar("files", ESP_HASH_SIZE);
+ esp->variables[ESP_REQUEST_OBJ] = mprCreateObjVar("request", ESP_HASH_SIZE);
+ esp->variables[ESP_SERVER_OBJ] = mprCreateObjVar("server", ESP_HASH_SIZE);
+ esp->variables[ESP_SESSION_OBJ] = mprCreateObjVar("session", ESP_HASH_SIZE);
+}
+
+/*
+ process a complete http request
+*/
+void http_process_input(struct websrv_context *web)
+{
+ NTSTATUS status;
+ struct esp_state *esp;
+ char *p;
+ int i;
+ const char *file_type = NULL;
+ const struct {
+ const char *extension;
+ const char *mime_type;
+ } mime_types[] = {
+ {"gif", "image/gif"},
+ {"png", "image/png"},
+ {"jpg", "image/jpeg"},
+ {"txt", "text/plain"}
+ };
+
+ esp = talloc_zero(web, struct esp_state);
+ if (esp == NULL) goto internal_error;
+
+ esp->web = web;
+
+ mprSetCtx(esp);
+
+ talloc_set_destructor(esp, esp_destructor);
+
+ if (espOpen(&esp_control) != 0) goto internal_error;
+
+ http_setup_vars(esp);
+
+ esp->req = espCreateRequest(web, web->input.url, esp->variables);
+ if (esp->req == NULL) goto internal_error;
+
+ if (web->input.url == NULL) {
+ http_error(web, 400, "You must specify a GET or POST request");
+ return;
+ }
+
+ if (web->input.post_request) {
+ status = http_parse_post(esp);
+ if (!NT_STATUS_IS_OK(status)) {
+ http_error(web, 400, "Malformed POST data");
+ return;
+ }
+ } else if (strchr(web->input.url, '?')) {
+ status = http_parse_get(esp);
+ if (!NT_STATUS_IS_OK(status)) {
+ http_error(web, 400, "Malformed GET data");
+ return;
+ }
+ }
+
+ /* process all html files as ESP */
+ p = strrchr(web->input.url, '.');
+ for (i=0;p && i<ARRAY_SIZE(mime_types);i++) {
+ if (strcmp(mime_types[i].extension, p+1) == 0) {
+ file_type = mime_types[i].mime_type;
+ }
+ }
+ if (file_type == NULL) {
+ file_type = "text/html";
+ }
+
+ /* setup basic headers */
+ http_setResponseCode(web, 200);
+ http_setHeader(web, talloc_asprintf(esp, "Date: %s",
+ http_timestring(esp, time(NULL))), 0);
+ http_setHeader(web, "Server: Samba", 0);
+ http_setHeader(web, "Connection: close", 0);
+ http_setHeader(web, talloc_asprintf(esp, "Content-Type: %s", file_type), 0);
+
+ if (strcmp(file_type, "text/html") == 0) {
+ esp_request(esp);
+ } else {
+ http_simple_request(web);
+ }
+ talloc_free(esp);
+ return;
+
+internal_error:
+ talloc_free(esp);
+ http_error(web, 500, "Internal server error");
+}
+
+
+/*
+ parse one line of header input
+*/
+NTSTATUS http_parse_header(struct websrv_context *web, const char *line)
+{
+ if (line[0] == 0) {
+ web->input.end_of_headers = True;
+ } else if (strncasecmp(line,"GET ", 4)==0) {
+ web->input.url = talloc_strndup(web, &line[4], strcspn(&line[4], " \t"));
+ } else if (strncasecmp(line,"POST ", 5)==0) {
+ web->input.post_request = True;
+ web->input.url = talloc_strndup(web, &line[5], strcspn(&line[5], " \t"));
+ } else if (strchr(line, ':') == NULL) {
+ http_error(web, 400, "This server only accepts GET and POST requests");
+ return NT_STATUS_INVALID_PARAMETER;
+ } else if (strncasecmp(line,"Content-Length: ", 16)==0) {
+ web->input.content_length = strtoul(&line[16], NULL, 10);
+ } else {
+#define PULL_HEADER(v, s) do { \
+ if (strncmp(line, s, strlen(s)) == 0) { \
+ web->input.v = talloc_strdup(web, &line[strlen(s)]); \
+ return NT_STATUS_OK; \
+ } \
+} while (0)
+ PULL_HEADER(content_type, "Content-Type: ");
+ PULL_HEADER(user_agent, "User-Agent: ");
+ PULL_HEADER(referer, "Referer: ");
+ PULL_HEADER(host, "Host: ");
+ PULL_HEADER(accept_encoding, "Accept-Encoding: ");
+ }
+
+ /* ignore all other headers for now */
+ return NT_STATUS_OK;
+}
+
+
generated by cgit (git 2.34.1) at 2024-08-26 15:49:02 +0000