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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,
char **ppath, int *pssl)
{
char *p, *buf;
char *host;
const char *port = OSSL_HTTP_PORT;
size_t https_len = strlen(OSSL_HTTPS_NAME);
if (!ossl_assert(https_len >= strlen(OSSL_HTTP_NAME)))
return 0;
if (url == NULL) {
HTTPerr(0, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
if (phost != NULL)
*phost = NULL;
if (pport != NULL)
*pport = NULL;
if (ppath != NULL)
*ppath = NULL;
if (pssl != NULL)
*pssl = 0;
/* dup the buffer since we are going to mess with it */
if ((buf = OPENSSL_strdup(url)) == NULL)
goto err;
/* Check for initial colon */
p = strchr(buf, ':');
if (p == NULL || (size_t)(p - buf) > https_len) {
p = buf;
} else {
*(p++) = '\0';
if (strcmp(buf, OSSL_HTTPS_NAME) == 0) {
if (pssl != NULL)
*pssl = 1;
port = OSSL_HTTPS_PORT;
} else if (strcmp(buf, OSSL_HTTP_NAME) != 0) {
goto parse_err;
}
/* Check for double slash */
if ((p[0] != '/') || (p[1] != '/'))
goto parse_err;
p += 2;
}
host = p;
/* Check for trailing part of path */
p = strchr(p, '/');
if (ppath != NULL && (*ppath = OPENSSL_strdup(p == NULL ? "/" : p)) == NULL)
goto err;
if (p != NULL)
*p = '\0'; /* Set start of path to 0 so hostname[:port] is valid */
p = host;
if (host[0] == '[') {
/* ipv6 literal */
host++;
p = strchr(host, ']');
if (p == NULL)
goto parse_err;
*p = '\0';
p++;
}
/* Look for optional ':' for port number */
if ((p = strchr(p, ':'))) {
*p = '\0';
port = p + 1;
}
if (phost != NULL && (*phost = OPENSSL_strdup(host)) == NULL)
goto err;
if (pport != NULL && (*pport = OPENSSL_strdup(port)) == NULL)
goto err;
OPENSSL_free(buf);
return 1;
parse_err:
HTTPerr(0, 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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