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asterisk/funcs/func_curl.c

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/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 2004 - 2006, Tilghman Lesher
*
* Tilghman Lesher <curl-20050919@the-tilghman.com>
* and Brian Wilkins <bwilkins@cfl.rr.com> (Added POST option)
*
* app_curl.c is distributed with no restrictions on usage or
* redistribution.
*
* 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.
*
*/
/*! \file
*
* \brief Curl - Load a URL
*
* \author Tilghman Lesher <curl-20050919@the-tilghman.com>
*
* \note Brian Wilkins <bwilkins@cfl.rr.com> (Added POST option)
*
* \extref Depends on the CURL library - http://curl.haxx.se/
*
* \ingroup functions
*/
/*** MODULEINFO
<depend>res_curl</depend>
<depend>curl</depend>
<support_level>core</support_level>
***/
#include "asterisk.h"
#include <curl/curl.h>
#include "asterisk/lock.h"
#include "asterisk/file.h"
#include "asterisk/channel.h"
#include "asterisk/pbx.h"
#include "asterisk/cli.h"
#include "asterisk/module.h"
#include "asterisk/app.h"
#include "asterisk/utils.h"
#include "asterisk/threadstorage.h"
#include "asterisk/test.h"
/*** DOCUMENTATION
<function name="CURL" language="en_US">
<synopsis>
Retrieve content from a remote web or ftp server
</synopsis>
<syntax>
<parameter name="url" required="true">
<para>The full URL for the resource to retrieve.</para>
</parameter>
<parameter name="post-data">
<para><emphasis>Read Only</emphasis></para>
<para>If specified, an <literal>HTTP POST</literal> will be
performed with the content of
<replaceable>post-data</replaceable>, instead of an
<literal>HTTP GET</literal> (default).</para>
</parameter>
</syntax>
<description>
<para>When this function is read, a <literal>HTTP GET</literal>
(by default) will be used to retrieve the contents of the provided
<replaceable>url</replaceable>. The contents are returned as the
result of the function.</para>
<example title="Displaying contents of a page" language="text">
exten => s,1,Verbose(0, ${CURL(http://localhost:8088/static/astman.css)})
</example>
<para>When this function is written to, a <literal>HTTP GET</literal>
will be used to retrieve the contents of the provided
<replaceable>url</replaceable>. The value written to the function
specifies the destination file of the cURL'd resource.</para>
<example title="Retrieving a file" language="text">
exten => s,1,Set(CURL(http://localhost:8088/static/astman.css)=/var/spool/asterisk/tmp/astman.css))
</example>
<note>
<para>If <literal>live_dangerously</literal> in <literal>asterisk.conf</literal>
is set to <literal>no</literal>, this function can only be written to from the
dialplan, and not directly from external protocols. Read operations are
unaffected.</para>
</note>
</description>
<see-also>
<ref type="function">CURLOPT</ref>
</see-also>
</function>
<function name="CURLOPT" language="en_US">
<synopsis>
Sets various options for future invocations of CURL.
</synopsis>
<syntax>
<parameter name="key" required="yes">
<enumlist>
<enum name="cookie">
<para>A cookie to send with the request. Multiple
cookies are supported.</para>
</enum>
<enum name="conntimeout">
<para>Number of seconds to wait for a connection to succeed</para>
</enum>
<enum name="dnstimeout">
<para>Number of seconds to wait for DNS to be resolved</para>
</enum>
<enum name="followlocation">
<para>Whether or not to follow HTTP 3xx redirects (boolean)</para>
</enum>
<enum name="ftptext">
<para>For FTP URIs, force a text transfer (boolean)</para>
</enum>
<enum name="ftptimeout">
<para>For FTP URIs, number of seconds to wait for a
server response</para>
</enum>
<enum name="header">
<para>Include header information in the result
(boolean)</para>
</enum>
<enum name="httpheader">
<para>Add HTTP header. Multiple calls add multiple headers.
Setting of any header will remove the default
"Content-Type application/x-www-form-urlencoded"</para>
</enum>
<enum name="httptimeout">
<para>For HTTP(S) URIs, number of seconds to wait for a
server response</para>
</enum>
<enum name="maxredirs">
<para>Maximum number of redirects to follow. The default is -1,
which allows for unlimited redirects. This only makes sense when
followlocation is also set.</para>
</enum>
<enum name="proxy">
<para>Hostname or IP address to use as a proxy server</para>
</enum>
<enum name="proxytype">
<para>Type of <literal>proxy</literal></para>
<enumlist>
<enum name="http" />
<enum name="socks4" />
<enum name="socks5" />
</enumlist>
</enum>
<enum name="proxyport">
<para>Port number of the <literal>proxy</literal></para>
</enum>
<enum name="proxyuserpwd">
<para>A <replaceable>username</replaceable><literal>:</literal><replaceable>password</replaceable>
combination to use for authenticating requests through a
<literal>proxy</literal></para>
</enum>
<enum name="referer">
<para>Referer URL to use for the request</para>
</enum>
<enum name="useragent">
<para>UserAgent string to use for the request</para>
</enum>
<enum name="userpwd">
<para>A <replaceable>username</replaceable><literal>:</literal><replaceable>password</replaceable>
to use for authentication when the server response to
an initial request indicates a 401 status code.</para>
</enum>
<enum name="ssl_verifypeer">
<para>Whether to verify the server certificate against
a list of known root certificate authorities (boolean).</para>
</enum>
<enum name="hashcompat">
<para>Assuming the responses will be in <literal>key1=value1&amp;key2=value2</literal>
format, reformat the response such that it can be used
by the <literal>HASH</literal> function.</para>
<enumlist>
<enum name="yes" />
<enum name="no" />
<enum name="legacy">
<para>Also translate <literal>+</literal> to the
space character, in violation of current RFC
standards.</para>
</enum>
</enumlist>
</enum>
<enum name="failurecodes">
<para>A comma separated list of HTTP response codes to be treated as errors</para>
</enum>
</enumlist>
</parameter>
</syntax>
<description>
<para>Options may be set globally or per channel. Per-channel
settings will override global settings. Only HTTP headers are added instead of overriding</para>
</description>
<see-also>
<ref type="function">CURL</ref>
<ref type="function">HASH</ref>
</see-also>
</function>
***/
#define CURLVERSION_ATLEAST(a,b,c) \
((LIBCURL_VERSION_MAJOR > (a)) || ((LIBCURL_VERSION_MAJOR == (a)) && (LIBCURL_VERSION_MINOR > (b))) || ((LIBCURL_VERSION_MAJOR == (a)) && (LIBCURL_VERSION_MINOR == (b)) && (LIBCURL_VERSION_PATCH >= (c))))
#define CURLOPT_SPECIAL_HASHCOMPAT ((CURLoption) -500)
#define CURLOPT_SPECIAL_FAILURE_CODE 999
static void curlds_free(void *data);
static const struct ast_datastore_info curl_info = {
.type = "CURL",
.destroy = curlds_free,
};
struct curl_settings {
AST_LIST_ENTRY(curl_settings) list;
CURLoption key;
void *value;
};
AST_LIST_HEAD_STATIC(global_curl_info, curl_settings);
static void curlds_free(void *data)
{
AST_LIST_HEAD(global_curl_info, curl_settings) *list = data;
struct curl_settings *setting;
if (!list) {
return;
}
while ((setting = AST_LIST_REMOVE_HEAD(list, list))) {
ast_free(setting);
}
AST_LIST_HEAD_DESTROY(list);
ast_free(list);
}
enum optiontype {
OT_BOOLEAN,
OT_INTEGER,
OT_INTEGER_MS,
OT_STRING,
OT_ENUM,
};
enum hashcompat {
HASHCOMPAT_NO = 0,
HASHCOMPAT_YES,
HASHCOMPAT_LEGACY,
};
static int parse_curlopt_key(const char *name, CURLoption *key, enum optiontype *ot)
{
if (!strcasecmp(name, "header")) {
*key = CURLOPT_HEADER;
*ot = OT_BOOLEAN;
} else if (!strcasecmp(name, "httpheader")) {
*key = CURLOPT_HTTPHEADER;
*ot = OT_STRING;
} else if (!strcasecmp(name, "proxy")) {
*key = CURLOPT_PROXY;
*ot = OT_STRING;
} else if (!strcasecmp(name, "proxyport")) {
*key = CURLOPT_PROXYPORT;
*ot = OT_INTEGER;
} else if (!strcasecmp(name, "proxytype")) {
*key = CURLOPT_PROXYTYPE;
*ot = OT_ENUM;
} else if (!strcasecmp(name, "dnstimeout")) {
*key = CURLOPT_DNS_CACHE_TIMEOUT;
*ot = OT_INTEGER;
} else if (!strcasecmp(name, "userpwd")) {
*key = CURLOPT_USERPWD;
*ot = OT_STRING;
} else if (!strcasecmp(name, "proxyuserpwd")) {
*key = CURLOPT_PROXYUSERPWD;
*ot = OT_STRING;
} else if (!strcasecmp(name, "followlocation")) {
*key = CURLOPT_FOLLOWLOCATION;
*ot = OT_BOOLEAN;
} else if (!strcasecmp(name, "maxredirs")) {
*key = CURLOPT_MAXREDIRS;
*ot = OT_INTEGER;
} else if (!strcasecmp(name, "referer")) {
*key = CURLOPT_REFERER;
*ot = OT_STRING;
} else if (!strcasecmp(name, "useragent")) {
*key = CURLOPT_USERAGENT;
*ot = OT_STRING;
} else if (!strcasecmp(name, "cookie")) {
*key = CURLOPT_COOKIE;
*ot = OT_STRING;
} else if (!strcasecmp(name, "ftptimeout")) {
*key = CURLOPT_FTP_RESPONSE_TIMEOUT;
*ot = OT_INTEGER;
} else if (!strcasecmp(name, "httptimeout")) {
#if CURLVERSION_ATLEAST(7,16,2)
*key = CURLOPT_TIMEOUT_MS;
*ot = OT_INTEGER_MS;
#else
*key = CURLOPT_TIMEOUT;
*ot = OT_INTEGER;
#endif
} else if (!strcasecmp(name, "conntimeout")) {
#if CURLVERSION_ATLEAST(7,16,2)
*key = CURLOPT_CONNECTTIMEOUT_MS;
*ot = OT_INTEGER_MS;
#else
*key = CURLOPT_CONNECTTIMEOUT;
*ot = OT_INTEGER;
#endif
} else if (!strcasecmp(name, "ftptext")) {
*key = CURLOPT_TRANSFERTEXT;
*ot = OT_BOOLEAN;
} else if (!strcasecmp(name, "ssl_verifypeer")) {
*key = CURLOPT_SSL_VERIFYPEER;
*ot = OT_BOOLEAN;
} else if (!strcasecmp(name, "hashcompat")) {
*key = CURLOPT_SPECIAL_HASHCOMPAT;
*ot = OT_ENUM;
} else if (!strcasecmp(name, "failurecodes")) {
*key = CURLOPT_SPECIAL_FAILURE_CODE;
*ot = OT_STRING;
} else {
return -1;
}
return 0;
}
static int acf_curlopt_write(struct ast_channel *chan, const char *cmd, char *name, const char *value)
{
struct ast_datastore *store;
struct global_curl_info *list;
struct curl_settings *cur, *new = NULL;
CURLoption key;
enum optiontype ot;
if (chan) {
if (!(store = ast_channel_datastore_find(chan, &curl_info, NULL))) {
/* Create a new datastore */
if (!(store = ast_datastore_alloc(&curl_info, NULL))) {
ast_log(LOG_ERROR, "Unable to allocate new datastore. Cannot set any CURL options\n");
return -1;
}
if (!(list = ast_calloc(1, sizeof(*list)))) {
ast_log(LOG_ERROR, "Unable to allocate list head. Cannot set any CURL options\n");
ast_datastore_free(store);
return -1;
}
store->data = list;
AST_LIST_HEAD_INIT(list);
ast_channel_datastore_add(chan, store);
} else {
list = store->data;
}
} else {
/* Populate the global structure */
list = &global_curl_info;
}
if (!parse_curlopt_key(name, &key, &ot)) {
if (ot == OT_BOOLEAN) {
if ((new = ast_calloc(1, sizeof(*new)))) {
new->value = (void *)((long) ast_true(value));
}
} else if (ot == OT_INTEGER) {
long tmp = atol(value);
if ((new = ast_calloc(1, sizeof(*new)))) {
new->value = (void *)tmp;
}
} else if (ot == OT_INTEGER_MS) {
long tmp = atof(value) * 1000.0;
if ((new = ast_calloc(1, sizeof(*new)))) {
new->value = (void *)tmp;
}
} else if (ot == OT_STRING) {
if ((new = ast_calloc(1, sizeof(*new) + strlen(value) + 1))) {
new->value = (char *)new + sizeof(*new);
strcpy(new->value, value);
}
} else if (ot == OT_ENUM) {
if (key == CURLOPT_PROXYTYPE) {
long ptype =
#if CURLVERSION_ATLEAST(7,10,0)
CURLPROXY_HTTP;
#else
CURLPROXY_SOCKS5;
#endif
if (0) {
#if CURLVERSION_ATLEAST(7,15,2)
} else if (!strcasecmp(value, "socks4")) {
ptype = CURLPROXY_SOCKS4;
#endif
#if CURLVERSION_ATLEAST(7,18,0)
} else if (!strcasecmp(value, "socks4a")) {
ptype = CURLPROXY_SOCKS4A;
#endif
#if CURLVERSION_ATLEAST(7,18,0)
} else if (!strcasecmp(value, "socks5")) {
ptype = CURLPROXY_SOCKS5;
#endif
#if CURLVERSION_ATLEAST(7,18,0)
} else if (!strncasecmp(value, "socks5", 6)) {
ptype = CURLPROXY_SOCKS5_HOSTNAME;
#endif
}
if ((new = ast_calloc(1, sizeof(*new)))) {
new->value = (void *)ptype;
}
} else if (key == CURLOPT_SPECIAL_HASHCOMPAT) {
if ((new = ast_calloc(1, sizeof(*new)))) {
new->value = (void *) (long) (!strcasecmp(value, "legacy") ? HASHCOMPAT_LEGACY : ast_true(value) ? HASHCOMPAT_YES : HASHCOMPAT_NO);
}
} else {
/* Highly unlikely */
goto yuck;
}
}
/* Memory allocation error */
if (!new) {
return -1;
}
new->key = key;
} else {
yuck:
ast_log(LOG_ERROR, "Unrecognized option: %s\n", name);
return -1;
}
/* Remove any existing entry, only http headers are left */
AST_LIST_LOCK(list);
if (new->key != CURLOPT_HTTPHEADER) {
AST_LIST_TRAVERSE_SAFE_BEGIN(list, cur, list) {
if (cur->key == new->key) {
AST_LIST_REMOVE_CURRENT(list);
ast_free(cur);
break;
}
}
AST_LIST_TRAVERSE_SAFE_END
}
/* Insert new entry */
ast_debug(1, "Inserting entry %p with key %d and value %p\n", new, new->key, new->value);
AST_LIST_INSERT_TAIL(list, new, list);
AST_LIST_UNLOCK(list);
return 0;
}
static int acf_curlopt_helper(struct ast_channel *chan, const char *cmd, char *data, char *buf, struct ast_str **bufstr, ssize_t len)
{
struct ast_datastore *store;
struct global_curl_info *list[2] = { &global_curl_info, NULL };
struct curl_settings *cur = NULL;
CURLoption key;
enum optiontype ot;
int i;
if (parse_curlopt_key(data, &key, &ot)) {
ast_log(LOG_ERROR, "Unrecognized option: '%s'\n", data);
return -1;
}
if (chan && (store = ast_channel_datastore_find(chan, &curl_info, NULL))) {
list[0] = store->data;
list[1] = &global_curl_info;
}
for (i = 0; i < 2; i++) {
if (!list[i]) {
break;
}
AST_LIST_LOCK(list[i]);
AST_LIST_TRAVERSE(list[i], cur, list) {
if (cur->key == key) {
if (ot == OT_BOOLEAN || ot == OT_INTEGER) {
if (buf) {
snprintf(buf, len, "%ld", (long) cur->value);
} else {
ast_str_set(bufstr, len, "%ld", (long) cur->value);
}
} else if (ot == OT_INTEGER_MS) {
if ((long) cur->value % 1000 == 0) {
if (buf) {
snprintf(buf, len, "%ld", (long)cur->value / 1000);
} else {
ast_str_set(bufstr, len, "%ld", (long) cur->value / 1000);
}
} else {
if (buf) {
snprintf(buf, len, "%.3f", (double) ((long) cur->value) / 1000.0);
} else {
ast_str_set(bufstr, len, "%.3f", (double) ((long) cur->value) / 1000.0);
}
}
} else if (ot == OT_STRING) {
ast_debug(1, "Found entry %p, with key %d and value %p\n", cur, cur->key, cur->value);
if (buf) {
ast_copy_string(buf, cur->value, len);
} else {
ast_str_set(bufstr, 0, "%s", (char *) cur->value);
}
} else if (key == CURLOPT_PROXYTYPE) {
const char *strval = "unknown";
if (0) {
#if CURLVERSION_ATLEAST(7,15,2)
} else if ((long)cur->value == CURLPROXY_SOCKS4) {
strval = "socks4";
#endif
#if CURLVERSION_ATLEAST(7,18,0)
} else if ((long)cur->value == CURLPROXY_SOCKS4A) {
strval = "socks4a";
#endif
} else if ((long)cur->value == CURLPROXY_SOCKS5) {
strval = "socks5";
#if CURLVERSION_ATLEAST(7,18,0)
} else if ((long)cur->value == CURLPROXY_SOCKS5_HOSTNAME) {
strval = "socks5hostname";
#endif
#if CURLVERSION_ATLEAST(7,10,0)
} else if ((long)cur->value == CURLPROXY_HTTP) {
strval = "http";
#endif
}
if (buf) {
ast_copy_string(buf, strval, len);
} else {
ast_str_set(bufstr, 0, "%s", strval);
}
} else if (key == CURLOPT_SPECIAL_HASHCOMPAT) {
const char *strval = "unknown";
if ((long) cur->value == HASHCOMPAT_LEGACY) {
strval = "legacy";
} else if ((long) cur->value == HASHCOMPAT_YES) {
strval = "yes";
} else if ((long) cur->value == HASHCOMPAT_NO) {
strval = "no";
}
if (buf) {
ast_copy_string(buf, strval, len);
} else {
ast_str_set(bufstr, 0, "%s", strval);
}
}
break;
}
}
AST_LIST_UNLOCK(list[i]);
if (cur) {
break;
}
}
return cur ? 0 : -1;
}
static int acf_curlopt_read(struct ast_channel *chan, const char *cmd, char *data, char *buf, size_t len)
{
return acf_curlopt_helper(chan, cmd, data, buf, NULL, len);
}
static int acf_curlopt_read2(struct ast_channel *chan, const char *cmd, char *data, struct ast_str **buf, ssize_t len)
{
return acf_curlopt_helper(chan, cmd, data, NULL, buf, len);
}
/*! \brief Callback data passed to \ref WriteMemoryCallback */
struct curl_write_callback_data {
/*! \brief If a string is being built, the string buffer */
struct ast_str *str;
/*! \brief The max size of \ref str */
ssize_t len;
/*! \brief If a file is being retrieved, the file to write to */
FILE *out_file;
};
static size_t WriteMemoryCallback(void *ptr, size_t size, size_t nmemb, void *data)
{
register int realsize = 0;
struct curl_write_callback_data *cb_data = data;
if (cb_data->str) {
realsize = size * nmemb;
ast_str_append_substr(&cb_data->str, 0, ptr, realsize);
} else if (cb_data->out_file) {
realsize = fwrite(ptr, size, nmemb, cb_data->out_file);
}
return realsize;
}
static int curl_instance_init(void *data)
{
CURL **curl = data;
if (!(*curl = curl_easy_init()))
return -1;
curl_easy_setopt(*curl, CURLOPT_NOSIGNAL, 1);
curl_easy_setopt(*curl, CURLOPT_TIMEOUT, 180);
curl_easy_setopt(*curl, CURLOPT_WRITEFUNCTION, WriteMemoryCallback);
curl_easy_setopt(*curl, CURLOPT_USERAGENT, AST_CURL_USER_AGENT);
return 0;
}
static void curl_instance_cleanup(void *data)
{
CURL **curl = data;
curl_easy_cleanup(*curl);
ast_free(data);
}
AST_THREADSTORAGE_CUSTOM(curl_instance, curl_instance_init, curl_instance_cleanup);
AST_THREADSTORAGE(thread_escapebuf);
/*!
* \brief Check for potential HTTP injection risk.
*
* CVE-2014-8150 brought up the fact that HTTP proxies are subject to injection
* attacks. An HTTP URL sent to a proxy contains a carriage-return linefeed combination,
* followed by a complete HTTP request. Proxies will handle this as two separate HTTP
* requests rather than as a malformed URL.
*
* libcURL patched this vulnerability in version 7.40.0, but we have no guarantee that
* Asterisk systems will be using an up-to-date cURL library. Therefore, we implement
* the same fix as libcURL for determining if a URL is vulnerable to an injection attack.
*
* \param url The URL to check for vulnerability
* \retval 0 The URL is not vulnerable
* \retval 1 The URL is vulnerable.
*/
static int url_is_vulnerable(const char *url)
{
if (strpbrk(url, "\r\n")) {
return 1;
}
return 0;
}
struct curl_args {
const char *url;
const char *postdata;
struct curl_write_callback_data cb_data;
};
static int acf_curl_helper(struct ast_channel *chan, struct curl_args *args)
{
struct ast_str *escapebuf = ast_str_thread_get(&thread_escapebuf, 16);
int ret = 0;
long http_code = 0; /* read curl response */
size_t i;
struct ast_vector_int hasfailurecode = { NULL };
char *failurecodestrings,*found;
CURL **curl;
struct curl_settings *cur;
struct curl_slist *headers = NULL;
struct ast_datastore *store = NULL;
int hashcompat = 0;
AST_LIST_HEAD(global_curl_info, curl_settings) *list = NULL;
char curl_errbuf[CURL_ERROR_SIZE + 1]; /* add one to be safe */
if (!escapebuf) {
return -1;
}
if (!(curl = ast_threadstorage_get(&curl_instance, sizeof(*curl)))) {
ast_log(LOG_ERROR, "Cannot allocate curl structure\n");
return -1;
}
if (url_is_vulnerable(args->url)) {
ast_log(LOG_ERROR, "URL '%s' is vulnerable to HTTP injection attacks. Aborting CURL() call.\n", args->url);
return -1;
}
if (chan) {
ast_autoservice_start(chan);
}
AST_VECTOR_INIT(&hasfailurecode, 0); /*Initialize vector*/
AST_LIST_LOCK(&global_curl_info);
AST_LIST_TRAVERSE(&global_curl_info, cur, list) {
if (cur->key == CURLOPT_SPECIAL_HASHCOMPAT) {
hashcompat = (long) cur->value;
} else if (cur->key == CURLOPT_HTTPHEADER) {
headers = curl_slist_append(headers, (char*) cur->value);
} else if (cur->key == CURLOPT_SPECIAL_FAILURE_CODE) {
failurecodestrings = (char*) cur->value;
while( (found = strsep(&failurecodestrings, ",")) != NULL) {
AST_VECTOR_APPEND(&hasfailurecode, atoi(found));
}
} else {
curl_easy_setopt(*curl, cur->key, cur->value);
}
}
AST_LIST_UNLOCK(&global_curl_info);
if (chan) {
ast_channel_lock(chan);
store = ast_channel_datastore_find(chan, &curl_info, NULL);
ast_channel_unlock(chan);
if (store) {
list = store->data;
AST_LIST_LOCK(list);
AST_LIST_TRAVERSE(list, cur, list) {
if (cur->key == CURLOPT_SPECIAL_HASHCOMPAT) {
hashcompat = (long) cur->value;
} else if (cur->key == CURLOPT_HTTPHEADER) {
headers = curl_slist_append(headers, (char*) cur->value);
} else if (cur->key == CURLOPT_SPECIAL_FAILURE_CODE) {
failurecodestrings = (char*) cur->value;
while( (found = strsep(&failurecodestrings, ",")) != NULL) {
AST_VECTOR_APPEND(&hasfailurecode, atoi(found));
}
} else {
curl_easy_setopt(*curl, cur->key, cur->value);
}
}
}
}
curl_easy_setopt(*curl, CURLOPT_URL, args->url);
curl_easy_setopt(*curl, CURLOPT_FILE, (void *) &args->cb_data);
if (args->postdata) {
curl_easy_setopt(*curl, CURLOPT_POST, 1);
curl_easy_setopt(*curl, CURLOPT_POSTFIELDS, args->postdata);
}
/* Always assign the headers - even when NULL - in case we had
* custom headers the last time we used this shared cURL
* instance */
curl_easy_setopt(*curl, CURLOPT_HTTPHEADER, headers);
/* Temporarily assign a buffer for curl to write errors to. */
curl_errbuf[0] = curl_errbuf[CURL_ERROR_SIZE] = '\0';
curl_easy_setopt(*curl, CURLOPT_ERRORBUFFER, curl_errbuf);
if (curl_easy_perform(*curl) != 0) {
ast_log(LOG_WARNING, "%s ('%s')\n", curl_errbuf, args->url);
}
/* Reset buffer to NULL so curl doesn't try to write to it when the
* buffer is deallocated. Documentation is vague about allowing NULL
* here, but the source allows it. See: "typecheck: allow NULL to unset
* CURLOPT_ERRORBUFFER" (62bcf005f4678a93158358265ba905bace33b834). */
curl_easy_setopt(*curl, CURLOPT_ERRORBUFFER, (char*)NULL);
curl_easy_getinfo (*curl, CURLINFO_RESPONSE_CODE, &http_code);
for (i = 0; i < AST_VECTOR_SIZE(&hasfailurecode); ++i) {
if (http_code == AST_VECTOR_GET(&hasfailurecode,i)){
ast_log(LOG_NOTICE, "%s%sCURL '%s' returned response code (%ld).\n",
chan ? ast_channel_name(chan) : "",
chan ? ast_channel_name(chan) : ": ",
args->url,
http_code);
ret=-1;
break;
}
}
AST_VECTOR_FREE(&hasfailurecode); /* Release the vector*/
if (store) {
AST_LIST_UNLOCK(list);
}
curl_slist_free_all(headers);
if (args->postdata) {
curl_easy_setopt(*curl, CURLOPT_POST, 0);
}
if (args->cb_data.str && ast_str_strlen(args->cb_data.str)) {
ast_str_trim_blanks(args->cb_data.str);
ast_debug(3, "CURL returned str='%s'\n", ast_str_buffer(args->cb_data.str));
if (hashcompat) {
char *remainder = ast_str_buffer(args->cb_data.str);
char *piece;
struct ast_str *fields = ast_str_create(ast_str_strlen(args->cb_data.str) / 2);
struct ast_str *values = ast_str_create(ast_str_strlen(args->cb_data.str) / 2);
int rowcount = 0;
while (fields && values && (piece = strsep(&remainder, "&"))) {
char *name = strsep(&piece, "=");
struct ast_flags mode = (hashcompat == HASHCOMPAT_LEGACY ? ast_uri_http_legacy : ast_uri_http);
if (piece) {
ast_uri_decode(piece, mode);
}
ast_uri_decode(name, mode);
ast_str_append(&fields, 0, "%s%s", rowcount ? "," : "", ast_str_set_escapecommas(&escapebuf, 0, name, INT_MAX));
ast_str_append(&values, 0, "%s%s", rowcount ? "," : "", ast_str_set_escapecommas(&escapebuf, 0, S_OR(piece, ""), INT_MAX));
rowcount++;
}
pbx_builtin_setvar_helper(chan, "~ODBCFIELDS~", ast_str_buffer(fields));
ast_str_set(&args->cb_data.str, 0, "%s", ast_str_buffer(values));
ast_free(fields);
ast_free(values);
}
}
if (chan) {
ast_autoservice_stop(chan);
}
return ret;
}
static int acf_curl_exec(struct ast_channel *chan, const char *cmd, char *info, struct ast_str **buf, ssize_t len)
{
struct curl_args curl_params = { 0, };
int res;
AST_DECLARE_APP_ARGS(args,
AST_APP_ARG(url);
AST_APP_ARG(postdata);
);
AST_STANDARD_APP_ARGS(args, info);
if (ast_strlen_zero(info)) {
ast_log(LOG_WARNING, "CURL requires an argument (URL)\n");
return -1;
}
curl_params.url = args.url;
curl_params.postdata = args.postdata;
curl_params.cb_data.str = ast_str_create(16);
if (!curl_params.cb_data.str) {
return -1;
}
res = acf_curl_helper(chan, &curl_params);
ast_str_set(buf, len, "%s", ast_str_buffer(curl_params.cb_data.str));
ast_free(curl_params.cb_data.str);
return res;
}
static int acf_curl_write(struct ast_channel *chan, const char *cmd, char *name, const char *value)
{
struct curl_args curl_params = { 0, };
int res;
char *args_value = ast_strdupa(value);
AST_DECLARE_APP_ARGS(args,
AST_APP_ARG(file_path);
);
AST_STANDARD_APP_ARGS(args, args_value);
if (ast_strlen_zero(name)) {
ast_log(LOG_WARNING, "CURL requires an argument (URL)\n");
return -1;
}
if (ast_strlen_zero(args.file_path)) {
ast_log(LOG_WARNING, "CURL requires a file to write\n");
return -1;
}
curl_params.url = name;
curl_params.cb_data.out_file = fopen(args.file_path, "w");
if (!curl_params.cb_data.out_file) {
ast_log(LOG_WARNING, "Failed to open file %s: %s (%d)\n",
args.file_path,
strerror(errno),
errno);
return -1;
}
res = acf_curl_helper(chan, &curl_params);
fclose(curl_params.cb_data.out_file);
return res;
}
static struct ast_custom_function acf_curl = {
.name = "CURL",
.read2 = acf_curl_exec,
.write = acf_curl_write,
};
static struct ast_custom_function acf_curlopt = {
.name = "CURLOPT",
.synopsis = "Set options for use with the CURL() function",
.syntax = "CURLOPT(<option>)",
.desc =
" cookie - Send cookie with request [none]\n"
" conntimeout - Number of seconds to wait for connection\n"
" dnstimeout - Number of seconds to wait for DNS response\n"
" followlocation - Follow HTTP 3xx redirects (boolean)\n"
" ftptext - For FTP, force a text transfer (boolean)\n"
" ftptimeout - For FTP, the server response timeout\n"
" header - Retrieve header information (boolean)\n"
" httpheader - Add new custom http header (string)\n"
" httptimeout - Number of seconds to wait for HTTP response\n"
" maxredirs - Maximum number of redirects to follow\n"
" proxy - Hostname or IP to use as a proxy\n"
" proxytype - http, socks4, or socks5\n"
" proxyport - port number of the proxy\n"
" proxyuserpwd - A <user>:<pass> to use for authentication\n"
" referer - Referer URL to use for the request\n"
" useragent - UserAgent string to use\n"
" userpwd - A <user>:<pass> to use for authentication\n"
" ssl_verifypeer - Whether to verify the peer certificate (boolean)\n"
" hashcompat - Result data will be compatible for use with HASH()\n"
" - if value is \"legacy\", will translate '+' to ' '\n"
" failurecodes - A comma separated list of HTTP response codes to be treated as errors\n"
"",
.read = acf_curlopt_read,
.read2 = acf_curlopt_read2,
.write = acf_curlopt_write,
};
#ifdef TEST_FRAMEWORK
AST_TEST_DEFINE(vulnerable_url)
{
const char *bad_urls [] = {
"http://example.com\r\nDELETE http://example.com/everything",
"http://example.com\rDELETE http://example.com/everything",
"http://example.com\nDELETE http://example.com/everything",
"\r\nhttp://example.com",
"\rhttp://example.com",
"\nhttp://example.com",
"http://example.com\r\n",
"http://example.com\r",
"http://example.com\n",
};
const char *good_urls [] = {
"http://example.com",
"http://example.com/%5Cr%5Cn",
};
int i;
enum ast_test_result_state res = AST_TEST_PASS;
switch (cmd) {
case TEST_INIT:
info->name = "vulnerable_url";
info->category = "/funcs/func_curl/";
info->summary = "cURL vulnerable URL test";
info->description =
"Ensure that any combination of '\\r' or '\\n' in a URL invalidates the URL";
case TEST_EXECUTE:
break;
}
for (i = 0; i < ARRAY_LEN(bad_urls); ++i) {
if (!url_is_vulnerable(bad_urls[i])) {
ast_test_status_update(test, "String '%s' detected as valid when it should be invalid\n", bad_urls[i]);
res = AST_TEST_FAIL;
}
}
for (i = 0; i < ARRAY_LEN(good_urls); ++i) {
if (url_is_vulnerable(good_urls[i])) {
ast_test_status_update(test, "String '%s' detected as invalid when it should be valid\n", good_urls[i]);
res = AST_TEST_FAIL;
}
}
return res;
}
#endif
static int unload_module(void)
{
int res;
res = ast_custom_function_unregister(&acf_curl);
res |= ast_custom_function_unregister(&acf_curlopt);
AST_TEST_UNREGISTER(vulnerable_url);
return res;
}
static int load_module(void)
{
int res;
res = ast_custom_function_register_escalating(&acf_curl, AST_CFE_WRITE);
res |= ast_custom_function_register(&acf_curlopt);
AST_TEST_REGISTER(vulnerable_url);
return res;
}
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "Load external URL",
.support_level = AST_MODULE_SUPPORT_CORE,
.load = load_module,
.unload = unload_module,
.load_pri = AST_MODPRI_REALTIME_DEPEND2,
.requires = "res_curl",
);
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