asterisk/res/res_http_post.c

518 lines
14 KiB
C

/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 1999 - 2006, Digium, Inc.
*
* Mark Spencer <markster@digium.com>
*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2. See the LICENSE file
* at the top of the source tree.
*/
/*!
* \file
* \brief HTTP POST upload support for Asterisk HTTP server
*
* \author Terry Wilson <twilson@digium.com
*
* \ref AstHTTP - AMI over the http protocol
*/
/*** MODULEINFO
<depend>gmime</depend>
<support_level>core</support_level>
***/
#include "asterisk.h"
#include <sys/stat.h>
#include <fcntl.h>
#include <gmime/gmime.h>
#if defined(__OpenBSD__) || defined(__FreeBSD__) || defined(__DragonFly__) || defined(__NetBSD__) || defined(__Darwin__) || defined(SOLARIS)
#include <libgen.h>
#endif
#include "asterisk/linkedlists.h"
#include "asterisk/http.h"
#include "asterisk/paths.h" /* use ast_config_AST_DATA_DIR */
#include "asterisk/tcptls.h"
#include "asterisk/manager.h"
#include "asterisk/cli.h"
#include "asterisk/module.h"
#include "asterisk/ast_version.h"
#define MAX_PREFIX 80
/* gmime 2.4 provides a newer interface. */
#ifdef GMIME_TYPE_CONTENT_TYPE
#define AST_GMIME_VER_24
#endif
#if defined(GMIME_MAJOR_VERSION) && (GMIME_MAJOR_VERSION >= 3)
#define AST_GMIME_VER_30
#endif
/* just a little structure to hold callback info for gmime */
struct mime_cbinfo {
int count;
const char *post_dir;
};
/* all valid URIs must be prepended by the string in prefix. */
static char prefix[MAX_PREFIX];
static void post_raw(GMimePart *part, const char *post_dir, const char *fn)
{
char filename[PATH_MAX];
GMimeDataWrapper *content;
GMimeStream *stream;
int fd;
snprintf(filename, sizeof(filename), "%s/%s", post_dir, fn);
ast_debug(1, "Posting raw data to %s\n", filename);
if ((fd = open(filename, O_CREAT | O_WRONLY | O_TRUNC, 0666)) == -1) {
ast_log(LOG_WARNING, "Unable to open %s for writing file from a POST!\n", filename);
return;
}
stream = g_mime_stream_fs_new(fd);
#ifdef AST_GMIME_VER_30
content = g_mime_part_get_content(part);
#else
content = g_mime_part_get_content_object(part);
#endif
g_mime_data_wrapper_write_to_stream(content, stream);
g_mime_stream_flush(stream);
#ifndef AST_GMIME_VER_24
g_object_unref(content);
#endif
g_object_unref(stream);
}
static GMimeMessage *parse_message(FILE *f)
{
GMimeMessage *message;
GMimeParser *parser;
GMimeStream *stream;
stream = g_mime_stream_file_new(f);
parser = g_mime_parser_new_with_stream(stream);
g_mime_parser_set_respect_content_length(parser, 1);
g_object_unref(stream);
message = g_mime_parser_construct_message(parser
#ifdef AST_GMIME_VER_30
, NULL
#endif
);
g_object_unref(parser);
return message;
}
#ifdef AST_GMIME_VER_24
static void process_message_callback(GMimeObject *parent, GMimeObject *part, gpointer user_data)
#else
static void process_message_callback(GMimeObject *part, gpointer user_data)
#endif
{
struct mime_cbinfo *cbinfo = user_data;
cbinfo->count++;
/* We strip off the headers before we get here, so should only see GMIME_IS_PART */
if (GMIME_IS_MESSAGE_PART(part)) {
ast_log(LOG_WARNING, "Got unexpected GMIME_IS_MESSAGE_PART\n");
return;
} else if (GMIME_IS_MESSAGE_PARTIAL(part)) {
ast_log(LOG_WARNING, "Got unexpected GMIME_IS_MESSAGE_PARTIAL\n");
return;
} else if (GMIME_IS_MULTIPART(part)) {
#ifndef AST_GMIME_VER_24
GList *l;
ast_log(LOG_WARNING, "Got unexpected GMIME_IS_MULTIPART, trying to process subparts\n");
l = GMIME_MULTIPART(part)->subparts;
while (l) {
process_message_callback(l->data, cbinfo);
l = l->next;
}
#else
ast_log(LOG_WARNING, "Got unexpected MIME subpart.\n");
#endif
} else if (GMIME_IS_PART(part)) {
const char *filename;
if (ast_strlen_zero(filename = g_mime_part_get_filename(GMIME_PART(part)))) {
ast_debug(1, "Skipping part with no filename\n");
return;
}
post_raw(GMIME_PART(part), cbinfo->post_dir, filename);
} else {
ast_log(LOG_ERROR, "Encountered unknown MIME part. This should never happen!\n");
}
}
static int process_message(GMimeMessage *message, const char *post_dir)
{
struct mime_cbinfo cbinfo = {
.count = 0,
.post_dir = post_dir,
};
#ifdef AST_GMIME_VER_24
g_mime_message_foreach(message, process_message_callback, &cbinfo);
#else
g_mime_message_foreach_part(message, process_message_callback, &cbinfo);
#endif
return cbinfo.count;
}
/* Find a sequence of bytes within a binary array. */
static int find_sequence(char * inbuf, int inlen, char * matchbuf, int matchlen)
{
int current;
int comp;
int found = 0;
for (current = 0; current < inlen-matchlen; current++, inbuf++) {
if (*inbuf == *matchbuf) {
found=1;
for (comp = 1; comp < matchlen; comp++) {
if (inbuf[comp] != matchbuf[comp]) {
found = 0;
break;
}
}
if (found) {
break;
}
}
}
if (found) {
return current;
} else {
return -1;
}
}
/*
* The following is a work around to deal with how IE7 embeds the local file name
* within the Mime header using full WINDOWS file path with backslash directory delimiters.
* This section of code attempts to isolate the directory path and remove it
* from what is written into the output file. In addition, it changes
* esc chars (i.e. backslashes) to forward slashes.
* This function has two modes. The first to find a boundary marker. The
* second is to find the filename immediately after the boundary.
*/
static int readmimefile(struct ast_iostream *in, FILE *fout, char *boundary, int contentlen)
{
int find_filename = 0;
char buf[4096];
int marker;
int x;
int char_in_buf = 0;
int num_to_read;
int boundary_len;
char * path_end, * path_start, * filespec;
if (NULL == in || NULL == fout || NULL == boundary || 0 >= contentlen) {
return -1;
}
boundary_len = strlen(boundary);
while (0 < contentlen || 0 < char_in_buf) {
/* determine how much I will read into the buffer */
if (contentlen > sizeof(buf) - char_in_buf) {
num_to_read = sizeof(buf)- char_in_buf;
} else {
num_to_read = contentlen;
}
if (0 < num_to_read) {
if (ast_iostream_read(in, &(buf[char_in_buf]), num_to_read) < num_to_read) {
ast_log(LOG_WARNING, "read failed: %s\n", strerror(errno));
num_to_read = 0;
}
contentlen -= num_to_read;
char_in_buf += num_to_read;
}
/* If I am looking for the filename spec */
if (find_filename) {
path_end = filespec = NULL;
x = strlen("filename=\"");
marker = find_sequence(buf, char_in_buf, "filename=\"", x );
if (0 <= marker) {
marker += x; /* Index beyond the filename marker */
path_start = &buf[marker];
for (path_end = path_start, x = 0; x < char_in_buf-marker; x++, path_end++) {
if ('\\' == *path_end) { /* convert backslashes to forward slashes */
*path_end = '/';
}
if ('\"' == *path_end) { /* If at the end of the file name spec */
*path_end = '\0'; /* temporarily null terminate the file spec for basename */
filespec = basename(path_start);
*path_end = '\"';
break;
}
}
}
if (filespec) { /* If the file name path was found in the header */
if (fwrite(buf, 1, marker, fout) != marker) {
ast_log(LOG_WARNING, "fwrite() failed: %s\n", strerror(errno));
}
x = (int)(path_end+1 - filespec);
if (fwrite(filespec, 1, x, fout) != x) {
ast_log(LOG_WARNING, "fwrite() failed: %s\n", strerror(errno));
}
x = (int)(path_end+1 - buf);
memmove(buf, &(buf[x]), char_in_buf-x);
char_in_buf -= x;
}
find_filename = 0;
} else { /* I am looking for the boundary marker */
marker = find_sequence(buf, char_in_buf, boundary, boundary_len);
if (0 > marker) {
if (char_in_buf < (boundary_len)) {
/*no possibility to find the boundary, write all you have */
if (fwrite(buf, 1, char_in_buf, fout) != char_in_buf) {
ast_log(LOG_WARNING, "fwrite() failed: %s\n", strerror(errno));
}
char_in_buf = 0;
} else {
/* write all except for area where the boundary marker could be */
if (fwrite(buf, 1, char_in_buf -(boundary_len -1), fout) != char_in_buf - (boundary_len - 1)) {
ast_log(LOG_WARNING, "fwrite() failed: %s\n", strerror(errno));
}
x = char_in_buf -(boundary_len -1);
memmove(buf, &(buf[x]), char_in_buf-x);
char_in_buf = (boundary_len -1);
}
} else {
/* write up through the boundary, then look for filename in the rest */
if (fwrite(buf, 1, marker + boundary_len, fout) != marker + boundary_len) {
ast_log(LOG_WARNING, "fwrite() failed: %s\n", strerror(errno));
}
x = marker + boundary_len;
memmove(buf, &(buf[x]), char_in_buf-x);
char_in_buf -= marker + boundary_len;
find_filename =1;
}
}
}
return 0;
}
static int http_post_callback(struct ast_tcptls_session_instance *ser, const struct ast_http_uri *urih, const char *uri, enum ast_http_method method, struct ast_variable *get_vars, struct ast_variable *headers)
{
struct ast_variable *var;
uint32_t ident;
FILE *f;
int content_len = 0;
struct ast_str *post_dir;
GMimeMessage *message;
char *boundary_marker = NULL;
if (method != AST_HTTP_POST) {
ast_http_error(ser, 501, "Not Implemented", "Attempt to use unimplemented / unsupported method");
return 0;
}
if (!urih) {
ast_http_error(ser, 400, "Missing URI handle", "There was an error parsing the request");
return 0;
}
ident = ast_http_manid_from_vars(headers);
if (!ident || !astman_is_authed(ident)) {
ast_http_request_close_on_completion(ser);
ast_http_error(ser, 403, "Access Denied", "Sorry, I cannot let you do that, Dave.");
return 0;
}
if (!astman_verify_session_writepermissions(ident, EVENT_FLAG_CONFIG)) {
ast_http_request_close_on_completion(ser);
ast_http_error(ser, 401, "Unauthorized", "You are not authorized to make this request.");
return 0;
}
if (!(f = tmpfile())) {
ast_log(LOG_ERROR, "Could not create temp file.\n");
ast_http_error(ser, 500, "Internal server error", "Could not create temp file.");
return 0;
}
for (var = headers; var; var = var->next) {
fprintf(f, "%s: %s\r\n", var->name, var->value);
if (!strcasecmp(var->name, "Content-Length")) {
if ((sscanf(var->value, "%30u", &content_len)) != 1) {
ast_log(LOG_ERROR, "Invalid Content-Length in POST request!\n");
fclose(f);
ast_http_request_close_on_completion(ser);
ast_http_error(ser, 400, "Bad Request", "Invalid Content-Length in POST request!");
return 0;
}
ast_debug(1, "Got a Content-Length of %d\n", content_len);
} else if (!strcasecmp(var->name, "Content-Type")) {
boundary_marker = strstr(var->value, "boundary=");
if (boundary_marker) {
boundary_marker += strlen("boundary=");
}
}
}
fprintf(f, "\r\n");
/*
* Always mark the body read as failed.
*
* XXX Should change readmimefile() to always be sure to read
* the entire body so we can update the read status and
* potentially keep the connection open.
*/
ast_http_body_read_status(ser, 0);
if (0 > readmimefile(ser->stream, f, boundary_marker, content_len)) {
ast_debug(1, "Cannot find boundary marker in POST request.\n");
fclose(f);
ast_http_error(ser, 400, "Bad Request", "Cannot find boundary marker in POST request.");
return 0;
}
if (fseek(f, SEEK_SET, 0)) {
ast_log(LOG_ERROR, "Failed to seek temp file back to beginning.\n");
fclose(f);
ast_http_error(ser, 500, "Internal server error", "Failed to seek temp file back to beginning.");
return 0;
}
post_dir = urih->data;
message = parse_message(f); /* Takes ownership and will close f */
if (!message) {
ast_log(LOG_ERROR, "Error parsing MIME data\n");
ast_http_error(ser, 400, "Bad Request", "There was an error parsing the request.");
return 0;
}
if (!process_message(message, ast_str_buffer(post_dir))) {
ast_log(LOG_ERROR, "Invalid MIME data, found no parts!\n");
g_object_unref(message);
ast_http_error(ser, 400, "Bad Request", "There was an error parsing the request.");
return 0;
}
g_object_unref(message);
/* XXX Passing 200 to the error response routine? */
ast_http_error(ser, 200, "OK", "File successfully uploaded.");
return 0;
}
static int __ast_http_post_load(int reload)
{
struct ast_config *cfg;
struct ast_variable *v;
struct ast_flags config_flags = { reload ? CONFIG_FLAG_FILEUNCHANGED : 0 };
cfg = ast_config_load2("http.conf", "http", config_flags);
if (!cfg || cfg == CONFIG_STATUS_FILEUNCHANGED || cfg == CONFIG_STATUS_FILEINVALID) {
return 0;
}
if (reload) {
ast_http_uri_unlink_all_with_key(__FILE__);
}
for (v = ast_variable_browse(cfg, "general"); v; v = v->next) {
if (!strcasecmp(v->name, "prefix")) {
ast_copy_string(prefix, v->value, sizeof(prefix));
if (prefix[strlen(prefix)] == '/') {
prefix[strlen(prefix)] = '\0';
}
}
}
for (v = ast_variable_browse(cfg, "post_mappings"); v; v = v->next) {
struct ast_http_uri *urih;
struct ast_str *ds;
if (!(urih = ast_calloc(sizeof(*urih), 1))) {
ast_config_destroy(cfg);
return -1;
}
if (!(ds = ast_str_create(32))) {
ast_free(urih);
ast_config_destroy(cfg);
return -1;
}
urih->description = ast_strdup("HTTP POST mapping");
urih->uri = ast_strdup(v->name);
ast_str_set(&ds, 0, "%s", v->value);
urih->data = ds;
urih->has_subtree = 0;
urih->callback = http_post_callback;
urih->key = __FILE__;
urih->mallocd = urih->dmallocd = 1;
ast_http_uri_link(urih);
}
ast_config_destroy(cfg);
return 0;
}
static int unload_module(void)
{
ast_http_uri_unlink_all_with_key(__FILE__);
return 0;
}
static int reload(void)
{
__ast_http_post_load(1);
return AST_MODULE_LOAD_SUCCESS;
}
static int load_module(void)
{
g_mime_init(
#ifndef AST_GMIME_VER_30
0
#endif
);
__ast_http_post_load(0);
return AST_MODULE_LOAD_SUCCESS;
}
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_DEFAULT, "HTTP POST support",
.support_level = AST_MODULE_SUPPORT_CORE,
.load = load_module,
.unload = unload_module,
.reload = reload,
.requires = "http",
);