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/*
* Copyright 2001-2021 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 <stdio.h> /* for sscanf() */
#include <string.h>
#include <openssl/http.h>
#include <openssl/httperr.h>
#include <openssl/bio.h> /* for BIO_snprintf() */
#include <openssl/err.h>
#include "internal/cryptlib.h" /* for ossl_assert() */
#include "http_local.h"
static void init_pstring(char **pstr)
{
if (pstr != NULL) {
*pstr = NULL;
}
}
static int copy_substring(char **dest, const char *start, const char *end)
{
return dest == NULL
|| (*dest = OPENSSL_strndup(start, end - start)) != NULL;
}
static void free_pstring(char **pstr)
{
if (pstr != NULL) {
OPENSSL_free(*pstr);
*pstr = NULL;
}
}
int OSSL_parse_url(const char *url, char **pscheme, char **puser, char **phost,
char **pport, int *pport_num,
char **ppath, char **pquery, char **pfrag)
{
const char *p, *tmp;
const char *scheme, *scheme_end;
const char *user, *user_end;
const char *host, *host_end;
const char *port, *port_end;
unsigned int portnum;
const char *path, *path_end;
const char *query, *query_end;
const char *frag, *frag_end;
init_pstring(pscheme);
init_pstring(puser);
init_pstring(phost);
init_pstring(pport);
init_pstring(ppath);
init_pstring(pfrag);
init_pstring(pquery);
if (url == NULL) {
ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
/* check for optional prefix "<scheme>://" */
scheme = scheme_end = url;
p = strstr(url, "://");
if (p == NULL) {
p = url;
} else {
scheme_end = p;
if (scheme_end == scheme)
goto parse_err;
p += strlen("://");
}
/* parse optional "userinfo@" */
user = user_end = host = p;
host = strchr(p, '@');
if (host != NULL)
user_end = host++;
else
host = p;
/* parse host name/address as far as needed here */
if (host[0] == '[') {
/* ipv6 literal, which may include ':' */
host_end = strchr(host + 1, ']');
if (host_end == NULL)
goto parse_err;
p = ++host_end;
} else {
/* look for start of optional port, path, query, or fragment */
host_end = strchr(host, ':');
if (host_end == NULL)
host_end = strchr(host, '/');
if (host_end == NULL)
host_end = strchr(host, '?');
if (host_end == NULL)
host_end = strchr(host, '#');
if (host_end == NULL) /* the remaining string is just the hostname */
host_end = host + strlen(host);
p = host_end;
}
/* parse optional port specification starting with ':' */
port = "0"; /* default */
if (*p == ':')
port = ++p;
/* remaining port spec handling is also done for the default values */
/* make sure a decimal port number is given */
if (!sscanf(port, "%u", &portnum) || portnum > 65535) {
ERR_raise_data(ERR_LIB_HTTP, HTTP_R_INVALID_PORT_NUMBER, "%s", port);
goto err;
}
for (port_end = port; '0' <= *port_end && *port_end <= '9'; port_end++)
;
if (port == p) /* port was given explicitly */
p += port_end - port;
/* check for optional path starting with '/' or '?'. Else must start '#' */
path = p;
if (*path != '\0' && *path != '/' && *path != '?' && *path != '#') {
ERR_raise(ERR_LIB_HTTP, HTTP_R_INVALID_URL_PATH);
goto parse_err;
}
path_end = query = query_end = frag = frag_end = path + strlen(path);
/* parse optional "?query" */
tmp = strchr(p, '?');
if (tmp != NULL) {
p = tmp;
if (pquery != NULL) {
path_end = p;
query = p + 1;
}
}
/* parse optional "#fragment" */
tmp = strchr(p, '#');
if (tmp != NULL) {
if (query == path_end) /* we did not record a query component */
path_end = tmp;
query_end = tmp;
frag = tmp + 1;
}
if (!copy_substring(pscheme, scheme, scheme_end)
|| !copy_substring(phost, host, host_end)
|| !copy_substring(pport, port, port_end)
|| !copy_substring(puser, user, user_end)
|| !copy_substring(pquery, query, query_end)
|| !copy_substring(pfrag, frag, frag_end))
goto err;
if (pport_num != NULL)
*pport_num = (int)portnum;
if (*path == '/') {
if (!copy_substring(ppath, path, path_end))
goto err;
} else if (ppath != NULL) { /* must prepend '/' */
size_t buflen = 1 + path_end - path + 1;
if ((*ppath = OPENSSL_malloc(buflen)) == NULL)
goto err;
BIO_snprintf(*ppath, buflen, "/%s", path);
}
return 1;
parse_err:
ERR_raise(ERR_LIB_HTTP, HTTP_R_ERROR_PARSING_URL);
err:
free_pstring(pscheme);
free_pstring(puser);
free_pstring(phost);
free_pstring(pport);
free_pstring(ppath);
free_pstring(pquery);
free_pstring(pfrag);
return 0;
}
int OSSL_HTTP_parse_url(const char *url, int *pssl, char **puser, char **phost,
char **pport, int *pport_num,
char **ppath, char **pquery, char **pfrag)
{
char *scheme, *port;
int ssl = 0, portnum;
init_pstring(pport);
if (pssl != NULL)
*pssl = 0;
if (!OSSL_parse_url(url, &scheme, puser, phost, &port, pport_num,
ppath, pquery, pfrag))
return 0;
/* check for optional HTTP scheme "http[s]" */
if (strcmp(scheme, OSSL_HTTPS_NAME) == 0) {
ssl = 1;
if (pssl != NULL)
*pssl = ssl;
} else if (*scheme != '\0' && strcmp(scheme, OSSL_HTTP_NAME) != 0) {
ERR_raise(ERR_LIB_HTTP, HTTP_R_INVALID_URL_SCHEME);
OPENSSL_free(scheme);
OPENSSL_free(port);
goto err;
}
OPENSSL_free(scheme);
if (strcmp(port, "0") == 0) {
/* set default port */
OPENSSL_free(port);
port = ssl ? OSSL_HTTPS_PORT : OSSL_HTTP_PORT;
if (!ossl_assert(sscanf(port, "%d", &portnum) == 1))
goto err;
if (pport_num != NULL)
*pport_num = portnum;
if (pport != NULL) {
*pport = OPENSSL_strdup(port);
if (*pport == NULL)
goto err;
}
} else {
if (pport != NULL)
*pport = port;
else
OPENSSL_free(port);
}
return 1;
err:
free_pstring(puser);
free_pstring(phost);
free_pstring(ppath);
free_pstring(pquery);
free_pstring(pfrag);
return 0;
}
/* Respect no_proxy, taking default value from environment variable(s) */
int ossl_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;
}
/* Take default value from environment variable(s), respect no_proxy */
const char *ossl_http_adapt_proxy(const char *proxy, const char *no_proxy,
const char *server, int use_ssl)
{
/*
* 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 || *proxy == '\0'
|| !ossl_http_use_proxy(no_proxy, server))
return NULL;
return proxy;
}
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