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/*
* Copyright 2001-2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <openssl/http.h>
#include <openssl/httperr.h>
#include <openssl/err.h>
#include <string.h>
#include "internal/cryptlib.h" /* for ossl_assert() */
#include "http_local.h"
/*
* Parse a URL and split it up into host, port and path components and
* whether it indicates SSL/TLS. Return 1 on success, 0 on error.
*/
int OSSL_HTTP_parse_url(const char *url, char **phost, char **pport,
int *pport_num, char **ppath, int *pssl)
{
char *p, *buf;
char *host, *host_end;
const char *path, *port = OSSL_HTTP_PORT;
long portnum = 80;
if (phost != NULL)
*phost = NULL;
if (pport != NULL)
*pport = NULL;
if (ppath != NULL)
*ppath = NULL;
if (pssl != NULL)
*pssl = 0;
if (url == NULL) {
ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
/* dup the buffer since we are going to mess with it */
if ((buf = OPENSSL_strdup(url)) == NULL)
goto err;
/* check for optional prefix "http[s]://" */
p = strstr(buf, "://");
if (p == NULL) {
p = buf;
} else {
*p = '\0'; /* p points to end of scheme name */
if (strcmp(buf, OSSL_HTTPS_NAME) == 0) {
if (pssl != NULL)
*pssl = 1;
port = OSSL_HTTPS_PORT;
portnum = 443;
} else if (strcmp(buf, OSSL_HTTP_NAME) != 0) {
ERR_raise(ERR_LIB_HTTP, HTTP_R_INVALID_URL_PREFIX);
goto err;
}
p += 3;
}
host = p;
/* parse host name/address as far as needed here */
if (host[0] == '[') {
/* ipv6 literal, which may include ':' */
host++;
host_end = strchr(host, ']');
if (host_end == NULL)
goto parse_err;
*host_end++ = '\0';
} else {
host_end = strchr(host, ':'); /* look for start of optional port */
if (host_end == NULL)
host_end = strchr(host, '/'); /* look for start of optional path */
if (host_end == NULL)
/* the remaining string is just the hostname */
host_end = host + strlen(host);
}
/* parse optional port specification starting with ':' */
p = host_end;
if (*p == ':') {
port = ++p;
if (pport_num == NULL) {
p = strchr(port, '/');
if (p == NULL)
p = host_end + 1 + strlen(port);
} else { /* make sure a numerical port value is given */
portnum = strtol(port, &p, 10);
if (p == port || (*p != '\0' && *p != '/'))
goto parse_err;
if (portnum <= 0 || portnum >= 65536) {
ERR_raise(ERR_LIB_HTTP, HTTP_R_INVALID_PORT_NUMBER);
goto err;
}
}
}
*host_end = '\0';
*p = '\0'; /* terminate port string */
/* check for optional path at end of url starting with '/' */
path = url + (p - buf);
/* cannot use p + 1 because *p is '\0' and path must start with '/' */
if (*path == '\0') {
path = "/";
} else if (*path != '/') {
ERR_raise(ERR_LIB_HTTP, HTTP_R_INVALID_URL_PATH);
goto parse_err;
}
if (phost != NULL && (*phost = OPENSSL_strdup(host)) == NULL)
goto err;
if (pport != NULL && (*pport = OPENSSL_strdup(port)) == NULL)
goto err;
if (pport_num != NULL)
*pport_num = (int)portnum;
if (ppath != NULL && (*ppath = OPENSSL_strdup(path)) == NULL)
goto err;
OPENSSL_free(buf);
return 1;
parse_err:
ERR_raise(ERR_LIB_HTTP, HTTP_R_ERROR_PARSING_URL);
err:
if (ppath != NULL) {
OPENSSL_free(*ppath);
*ppath = NULL;
}
if (pport != NULL) {
OPENSSL_free(*pport);
*pport = NULL;
}
if (phost != NULL) {
OPENSSL_free(*phost);
*phost = NULL;
}
OPENSSL_free(buf);
return 0;
}
int http_use_proxy(const char *no_proxy, const char *server)
{
size_t sl;
const char *found = NULL;
if (!ossl_assert(server != NULL))
return 0;
sl = strlen(server);
/*
* using environment variable names, both lowercase and uppercase variants,
* compatible with other HTTP client implementations like wget, curl and git
*/
if (no_proxy == NULL)
no_proxy = getenv("no_proxy");
if (no_proxy == NULL)
no_proxy = getenv(OPENSSL_NO_PROXY);
if (no_proxy != NULL)
found = strstr(no_proxy, server);
while (found != NULL
&& ((found != no_proxy && found[-1] != ' ' && found[-1] != ',')
|| (found[sl] != '\0' && found[sl] != ' ' && found[sl] != ',')))
found = strstr(found + 1, server);
return found == NULL;
}
const char *http_adapt_proxy(const char *proxy, const char *no_proxy,
const char *server, int use_ssl)
{
const int http_len = strlen(OSSL_HTTP_PREFIX);
const int https_len = strlen(OSSL_HTTPS_PREFIX);
/*
* using environment variable names, both lowercase and uppercase variants,
* compatible with other HTTP client implementations like wget, curl and git
*/
if (proxy == NULL)
proxy = getenv(use_ssl ? "https_proxy" : "http_proxy");
if (proxy == NULL)
proxy = getenv(use_ssl ? OPENSSL_HTTP_PROXY :
OPENSSL_HTTPS_PROXY);
if (proxy == NULL)
return NULL;
/* skip any leading "http://" or "https://" */
if (strncmp(proxy, OSSL_HTTP_PREFIX, http_len) == 0)
proxy += http_len;
else if (strncmp(proxy, OSSL_HTTPS_PREFIX, https_len) == 0)
proxy += https_len;
if (*proxy == '\0' || !http_use_proxy(no_proxy, server))
return NULL;
return proxy;
}
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