1 /*
2 * Copyright 2001-2025 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10 #include <stdio.h> /* for sscanf() */
11 #include <string.h>
12 #include <openssl/http.h>
13 #include <openssl/httperr.h>
14 #include <openssl/bio.h> /* for BIO_snprintf() */
15 #include <openssl/err.h>
16 #include "internal/cryptlib.h" /* for ossl_assert() */
17 #ifndef OPENSSL_NO_SOCK
18 # include "internal/bio_addr.h" /* for NI_MAXHOST */
19 #endif
20 #ifndef NI_MAXHOST
21 # define NI_MAXHOST 255
22 #endif
23 #include "crypto/ctype.h" /* for ossl_isspace() */
24
init_pstring(char ** pstr)25 static void init_pstring(char **pstr)
26 {
27 if (pstr != NULL) {
28 *pstr = NULL;
29 }
30 }
31
init_pint(int * pint)32 static void init_pint(int *pint)
33 {
34 if (pint != NULL) {
35 *pint = 0;
36 }
37 }
38
copy_substring(char ** dest,const char * start,const char * end)39 static int copy_substring(char **dest, const char *start, const char *end)
40 {
41 return dest == NULL
42 || (*dest = OPENSSL_strndup(start, end - start)) != NULL;
43 }
44
free_pstring(char ** pstr)45 static void free_pstring(char **pstr)
46 {
47 if (pstr != NULL) {
48 OPENSSL_free(*pstr);
49 *pstr = NULL;
50 }
51 }
52
OSSL_parse_url(const char * url,char ** pscheme,char ** puser,char ** phost,char ** pport,int * pport_num,char ** ppath,char ** pquery,char ** pfrag)53 int OSSL_parse_url(const char *url, char **pscheme, char **puser, char **phost,
54 char **pport, int *pport_num,
55 char **ppath, char **pquery, char **pfrag)
56 {
57 const char *p, *tmp;
58 const char *scheme, *scheme_end;
59 const char *user, *user_end;
60 const char *host, *host_end;
61 const char *port, *port_end;
62 unsigned int portnum = 0;
63 const char *path, *path_end;
64 const char *query, *query_end;
65 const char *frag, *frag_end;
66
67 init_pstring(pscheme);
68 init_pstring(puser);
69 init_pstring(phost);
70 init_pstring(pport);
71 init_pint(pport_num);
72 init_pstring(ppath);
73 init_pstring(pfrag);
74 init_pstring(pquery);
75
76 if (url == NULL) {
77 ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER);
78 return 0;
79 }
80
81 /* check for optional prefix "<scheme>://" */
82 scheme = scheme_end = url;
83 p = strstr(url, "://");
84 if (p == NULL) {
85 p = url;
86 } else {
87 scheme_end = p;
88 if (scheme_end == scheme)
89 goto parse_err;
90 p += strlen("://");
91 }
92
93 /* parse optional "userinfo@" */
94 user = user_end = host = p;
95 host = strchr(p, '@');
96 if (host != NULL)
97 user_end = host++;
98 else
99 host = p;
100
101 /* parse hostname/address as far as needed here */
102 if (host[0] == '[') {
103 /* IPv6 literal, which may include ':' */
104 host_end = strchr(host + 1, ']');
105 if (host_end == NULL)
106 goto parse_err;
107 p = ++host_end;
108 } else {
109 /* look for start of optional port, path, query, or fragment */
110 host_end = strpbrk(host, ":/?#");
111 if (host_end == NULL) /* the remaining string is just the hostname */
112 host_end = host + strlen(host);
113 p = host_end;
114 }
115
116 /* parse optional port specification starting with ':' */
117 port = "0"; /* default */
118 if (*p == ':')
119 port = ++p;
120 /* remaining port spec handling is also done for the default values */
121 /* make sure a decimal port number is given */
122 if (sscanf(port, "%u", &portnum) <= 0 || portnum > 65535) {
123 ERR_raise_data(ERR_LIB_HTTP, HTTP_R_INVALID_PORT_NUMBER, "%s", port);
124 goto err;
125 }
126 for (port_end = port; '0' <= *port_end && *port_end <= '9'; port_end++)
127 ;
128 if (port == p) /* port was given explicitly */
129 p += port_end - port;
130
131 /* check for optional path starting with '/' or '?'. Else must start '#' */
132 path = p;
133 if (*path != '\0' && *path != '/' && *path != '?' && *path != '#') {
134 ERR_raise(ERR_LIB_HTTP, HTTP_R_INVALID_URL_PATH);
135 goto parse_err;
136 }
137 path_end = query = query_end = frag = frag_end = path + strlen(path);
138
139 /* parse optional "?query" */
140 tmp = strchr(p, '?');
141 if (tmp != NULL) {
142 p = tmp;
143 if (pquery != NULL) {
144 path_end = p;
145 query = p + 1;
146 }
147 }
148
149 /* parse optional "#fragment" */
150 tmp = strchr(p, '#');
151 if (tmp != NULL) {
152 if (query == path_end) /* we did not record a query component */
153 path_end = tmp;
154 query_end = tmp;
155 frag = tmp + 1;
156 }
157
158 if (!copy_substring(pscheme, scheme, scheme_end)
159 || !copy_substring(phost, host, host_end)
160 || !copy_substring(pport, port, port_end)
161 || !copy_substring(puser, user, user_end)
162 || !copy_substring(pquery, query, query_end)
163 || !copy_substring(pfrag, frag, frag_end))
164 goto err;
165 if (pport_num != NULL)
166 *pport_num = (int)portnum;
167 if (*path == '/') {
168 if (!copy_substring(ppath, path, path_end))
169 goto err;
170 } else if (ppath != NULL) { /* must prepend '/' */
171 size_t buflen = 1 + path_end - path + 1;
172
173 if ((*ppath = OPENSSL_malloc(buflen)) == NULL)
174 goto err;
175 BIO_snprintf(*ppath, buflen, "/%s", path);
176 }
177 return 1;
178
179 parse_err:
180 ERR_raise(ERR_LIB_HTTP, HTTP_R_ERROR_PARSING_URL);
181
182 err:
183 free_pstring(pscheme);
184 free_pstring(puser);
185 free_pstring(phost);
186 free_pstring(pport);
187 free_pstring(ppath);
188 free_pstring(pquery);
189 free_pstring(pfrag);
190 return 0;
191 }
192
193 #ifndef OPENSSL_NO_HTTP
194
OSSL_HTTP_parse_url(const char * url,int * pssl,char ** puser,char ** phost,char ** pport,int * pport_num,char ** ppath,char ** pquery,char ** pfrag)195 int OSSL_HTTP_parse_url(const char *url, int *pssl, char **puser, char **phost,
196 char **pport, int *pport_num,
197 char **ppath, char **pquery, char **pfrag)
198 {
199 char *scheme, *port;
200 int ssl = 0, portnum;
201
202 init_pstring(pport);
203 if (pssl != NULL)
204 *pssl = 0;
205 if (!OSSL_parse_url(url, &scheme, puser, phost, &port, pport_num,
206 ppath, pquery, pfrag))
207 return 0;
208
209 /* check for optional HTTP scheme "http[s]" */
210 if (strcmp(scheme, OSSL_HTTPS_NAME) == 0) {
211 ssl = 1;
212 if (pssl != NULL)
213 *pssl = ssl;
214 } else if (*scheme != '\0' && strcmp(scheme, OSSL_HTTP_NAME) != 0) {
215 ERR_raise(ERR_LIB_HTTP, HTTP_R_INVALID_URL_SCHEME);
216 OPENSSL_free(scheme);
217 OPENSSL_free(port);
218 goto err;
219 }
220 OPENSSL_free(scheme);
221
222 if (strcmp(port, "0") == 0) {
223 /* set default port */
224 OPENSSL_free(port);
225 port = ssl ? OSSL_HTTPS_PORT : OSSL_HTTP_PORT;
226 if (!ossl_assert(sscanf(port, "%d", &portnum) == 1))
227 goto err;
228 if (pport_num != NULL)
229 *pport_num = portnum;
230 if (pport != NULL) {
231 *pport = OPENSSL_strdup(port);
232 if (*pport == NULL)
233 goto err;
234 }
235 } else {
236 if (pport != NULL)
237 *pport = port;
238 else
239 OPENSSL_free(port);
240 }
241 return 1;
242
243 err:
244 free_pstring(puser);
245 free_pstring(phost);
246 free_pstring(ppath);
247 free_pstring(pquery);
248 free_pstring(pfrag);
249 return 0;
250 }
251
252 /* Respect no_proxy, taking default value from environment variable(s) */
use_proxy(const char * no_proxy,const char * server)253 static int use_proxy(const char *no_proxy, const char *server)
254 {
255 size_t sl;
256 const char *found = NULL;
257 char host[NI_MAXHOST];
258
259 if (!ossl_assert(server != NULL))
260 return 0;
261 sl = strlen(server);
262 if (sl >= 2 && sl < sizeof(host) + 2 && server[0] == '[' && server[sl - 1] == ']') {
263 /* strip leading '[' and trailing ']' from escaped IPv6 address */
264 sl -= 2;
265 strncpy(host, server + 1, sl);
266 server = host;
267 }
268
269 /*
270 * using environment variable names, both lowercase and uppercase variants,
271 * compatible with other HTTP client implementations like wget, curl and git
272 */
273 if (no_proxy == NULL)
274 no_proxy = ossl_safe_getenv("no_proxy");
275 if (no_proxy == NULL)
276 no_proxy = ossl_safe_getenv(OPENSSL_NO_PROXY);
277
278 if (no_proxy != NULL)
279 found = strstr(no_proxy, server);
280 while (found != NULL
281 && ((found != no_proxy && !ossl_isspace(found[-1]) && found[-1] != ',')
282 || (found[sl] != '\0' && !ossl_isspace(found[sl]) && found[sl] != ',')))
283 found = strstr(found + 1, server);
284 return found == NULL;
285 }
286
287 /* Take default value from environment variable(s), respect no_proxy */
OSSL_HTTP_adapt_proxy(const char * proxy,const char * no_proxy,const char * server,int use_ssl)288 const char *OSSL_HTTP_adapt_proxy(const char *proxy, const char *no_proxy,
289 const char *server, int use_ssl)
290 {
291 /*
292 * using environment variable names, both lowercase and uppercase variants,
293 * compatible with other HTTP client implementations like wget, curl and git
294 */
295 if (proxy == NULL)
296 proxy = ossl_safe_getenv(use_ssl ? "https_proxy" : "http_proxy");
297 if (proxy == NULL)
298 proxy = ossl_safe_getenv(use_ssl ? OPENSSL_HTTPS_PROXY : OPENSSL_HTTP_PROXY);
299
300 if (proxy == NULL || *proxy == '\0' || !use_proxy(no_proxy, server))
301 return NULL;
302 return proxy;
303 }
304
305 #endif /* !defined(OPENSSL_NO_HTTP) */
306