2 some simple CGI helper routines
3 Copyright (C) Andrew Tridgell 1997-1998
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 #include "../web/swat_proto.h"
24 #define MAX_VARIABLES 10000
26 /* set the expiry on fixed pages */
27 #define EXPIRY_TIME (60*60*24*7)
30 extern void print_title(char *fmt
, ...);
38 static struct var variables
[MAX_VARIABLES
];
39 static int num_variables
;
40 static int content_length
;
41 static int request_post
;
42 static char *query_string
;
43 static const char *baseurl
;
44 static char *pathinfo
;
46 static BOOL inetd_server
;
47 static BOOL got_request
;
49 static char *grab_line(FILE *f
, int *cl
)
60 if (len
== 0) len
= 1024;
62 ret2
= (char *)Realloc(ret
, len
);
63 if (!ret2
) return ret
;
75 if (c
== '\r') continue;
77 if (strchr_m("\n&", c
)) break;
88 /***************************************************************************
89 load all the variables passed to the CGI program. May have multiple variables
90 with the same name and the same or different values. Takes a file parameter
91 for simulating CGI invocation eg loading saved preferences.
92 ***************************************************************************/
93 void cgi_load_variables(void)
100 #ifdef DEBUG_COMMENTS
103 d_printf("<!== Start dump in cgi_load_variables() %s ==>\n",__FILE__
);
106 if (!content_length
) {
107 p
= getenv("CONTENT_LENGTH");
110 len
= content_length
;
116 ((s
=getenv("REQUEST_METHOD")) &&
117 strequal(s
,"POST")))) {
118 while (len
&& (line
=grab_line(f
, &len
))) {
119 p
= strchr_m(line
,'=');
124 variables
[num_variables
].name
= strdup(line
);
125 variables
[num_variables
].value
= strdup(p
+1);
129 if (!variables
[num_variables
].name
||
130 !variables
[num_variables
].value
)
133 rfc1738_unescape(variables
[num_variables
].value
);
134 rfc1738_unescape(variables
[num_variables
].name
);
136 #ifdef DEBUG_COMMENTS
137 printf("<!== POST var %s has value \"%s\" ==>\n",
138 variables
[num_variables
].name
,
139 variables
[num_variables
].value
);
143 if (num_variables
== MAX_VARIABLES
) break;
148 open("/dev/null", O_RDWR
);
150 if ((s
=query_string
) || (s
=getenv("QUERY_STRING"))) {
151 for (tok
=strtok(s
,"&;");tok
;tok
=strtok(NULL
,"&;")) {
152 p
= strchr_m(tok
,'=');
157 variables
[num_variables
].name
= strdup(tok
);
158 variables
[num_variables
].value
= strdup(p
+1);
160 if (!variables
[num_variables
].name
||
161 !variables
[num_variables
].value
)
164 rfc1738_unescape(variables
[num_variables
].value
);
165 rfc1738_unescape(variables
[num_variables
].name
);
167 #ifdef DEBUG_COMMENTS
168 printf("<!== Commandline var %s has value \"%s\" ==>\n",
169 variables
[num_variables
].name
,
170 variables
[num_variables
].value
);
173 if (num_variables
== MAX_VARIABLES
) break;
177 #ifdef DEBUG_COMMENTS
178 printf("<!== End dump in cgi_load_variables() ==>\n");
181 /* variables from the client are in display charset - convert them
182 to our internal charset before use */
183 for (i
=0;i
<num_variables
;i
++) {
186 convert_string(CH_DISPLAY
, CH_UNIX
,
187 variables
[i
].name
, -1,
189 free(variables
[i
].name
);
190 variables
[i
].name
= strdup(dest
);
192 convert_string(CH_DISPLAY
, CH_UNIX
,
193 variables
[i
].value
, -1,
195 free(variables
[i
].value
);
196 variables
[i
].value
= strdup(dest
);
201 /***************************************************************************
202 find a variable passed via CGI
203 Doesn't quite do what you think in the case of POST text variables, because
204 if they exist they might have a value of "" or even " ", depending on the
205 browser. Also doesn't allow for variables[] containing multiple variables
206 with the same name and the same or different values.
207 ***************************************************************************/
208 const char *cgi_variable(const char *name
)
212 for (i
=0;i
<num_variables
;i
++)
213 if (strcmp(variables
[i
].name
, name
) == 0)
214 return variables
[i
].value
;
218 /***************************************************************************
219 tell a browser about a fatal error in the http processing
220 ***************************************************************************/
221 static void cgi_setup_error(const char *err
, const char *header
, const char *info
)
224 /* damn browsers don't like getting cut off before they give a request */
226 while (fgets(line
, sizeof(line
)-1, stdin
)) {
227 if (strnequal(line
,"GET ", 4) ||
228 strnequal(line
,"POST ", 5) ||
229 strnequal(line
,"PUT ", 4)) {
235 d_printf("HTTP/1.0 %s\r\n%sConnection: close\r\nContent-Type: text/html\r\n\r\n<HTML><HEAD><TITLE>%s</TITLE></HEAD><BODY><H1>%s</H1>%s<p></BODY></HTML>\r\n\r\n", err
, header
, err
, err
, info
);
242 /***************************************************************************
243 tell a browser about a fatal authentication error
244 ***************************************************************************/
245 static void cgi_auth_error(void)
248 cgi_setup_error("401 Authorization Required",
249 "WWW-Authenticate: Basic realm=\"SWAT\"\r\n",
250 "You must be authenticated to use this service");
252 printf("Content-Type: text/html\r\n");
254 printf("\r\n<HTML><HEAD><TITLE>SWAT</TITLE></HEAD>\n");
255 printf("<BODY><H1>Installation Error</H1>\n");
256 printf("SWAT must be installed via inetd. It cannot be run as a CGI script<p>\n");
257 printf("</BODY></HTML>\r\n");
262 /***************************************************************************
263 authenticate when we are running as a CGI
264 ***************************************************************************/
265 static void cgi_web_auth(void)
267 const char *user
= getenv("REMOTE_USER");
269 const char *head
= "Content-Type: text/html\r\n\r\n<HTML><BODY><H1>SWAT installation Error</H1>\n";
270 const char *tail
= "</BODY></HTML>\r\n";
273 printf("%sREMOTE_USER not set. Not authenticated by web server.<br>%s\n",
278 pwd
= getpwnam_alloc(user
);
280 printf("%sCannot find user %s<br>%s\n", head
, user
, tail
);
286 if (geteuid() != pwd
->pw_uid
|| getuid() != pwd
->pw_uid
) {
287 printf("%sFailed to become user %s - uid=%d/%d<br>%s\n",
288 head
, user
, (int)geteuid(), (int)getuid(), tail
);
295 /***************************************************************************
296 handle a http authentication line
297 ***************************************************************************/
298 static BOOL
cgi_handle_authorization(char *line
)
301 fstring user
, user_pass
;
302 struct passwd
*pass
= NULL
;
304 if (!strnequal(line
,"Basic ", 6)) {
308 while (line
[0] == ' ') line
++;
309 base64_decode_inplace(line
);
310 if (!(p
=strchr_m(line
,':'))) {
312 * Always give the same error so a cracker
313 * cannot tell why we fail.
319 convert_string(CH_DISPLAY
, CH_UNIX
,
323 convert_string(CH_DISPLAY
, CH_UNIX
,
325 user_pass
, sizeof(user_pass
));
328 * Try and get the user from the UNIX password file.
331 pass
= getpwnam_alloc(user
);
334 * Validate the password they have given.
337 if NT_STATUS_IS_OK(pass_check(pass
, user
, user_pass
,
338 strlen(user_pass
), NULL
, False
)) {
345 if ( initgroups(pass
->pw_name
, pass
->pw_gid
) != 0 )
348 become_user_permanently(pass
->pw_uid
, pass
->pw_gid
);
350 /* Save the users name */
351 C_user
= strdup(user
);
358 cgi_setup_error("401 Bad Authorization", "",
359 "username or password incorrect");
365 /***************************************************************************
367 ***************************************************************************/
370 if (geteuid() == 0) {
377 /***************************************************************************
378 return a ptr to the users name
379 ***************************************************************************/
380 char *cgi_user_name(void)
386 /***************************************************************************
387 handle a file download
388 ***************************************************************************/
389 static void cgi_download(char *file
)
397 /* sanitise the filename */
398 for (i
=0;file
[i
];i
++) {
399 if (!isalnum((int)file
[i
]) && !strchr_m("/.-_", file
[i
])) {
400 cgi_setup_error("404 File Not Found","",
401 "Illegal character in filename");
405 if (!file_exist(file
, &st
)) {
406 cgi_setup_error("404 File Not Found","",
407 "The requested file was not found");
410 fd
= web_open(file
,O_RDONLY
,0);
412 cgi_setup_error("404 File Not Found","",
413 "The requested file was not found");
415 printf("HTTP/1.0 200 OK\r\n");
416 if ((p
=strrchr_m(file
,'.'))) {
417 if (strcmp(p
,".gif")==0) {
418 printf("Content-Type: image/gif\r\n");
419 } else if (strcmp(p
,".jpg")==0) {
420 printf("Content-Type: image/jpeg\r\n");
421 } else if (strcmp(p
,".txt")==0) {
422 printf("Content-Type: text/plain\r\n");
424 printf("Content-Type: text/html\r\n");
427 printf("Expires: %s\r\n", http_timestring(time(NULL
)+EXPIRY_TIME
));
429 lang
= lang_tdb_current();
431 printf("Content-Language: %s\r\n", lang
);
434 printf("Content-Length: %d\r\n\r\n", (int)st
.st_size
);
435 while ((l
=read(fd
,buf
,sizeof(buf
)))>0) {
436 fwrite(buf
, 1, l
, stdout
);
446 * @brief Setup the CGI framework.
448 * Setup the cgi framework, handling the possibility that this program
449 * is either run as a true CGI program with a gateway to a web server, or
450 * is itself a mini web server.
452 void cgi_setup(const char *rootdir
, int auth_required
)
454 BOOL authenticated
= False
;
460 if (chdir(rootdir
)) {
461 cgi_setup_error("500 Server Error", "",
462 "chdir failed - the server is not configured correctly");
465 /* Handle the possibility we might be running as non-root */
468 if ((lang
=getenv("HTTP_ACCEPT_LANGUAGE"))) {
469 /* if running as a cgi program */
473 /* maybe we are running under a web server */
474 if (getenv("CONTENT_LENGTH") || getenv("REQUEST_METHOD")) {
483 if (!check_access(1, lp_hostsallow(-1), lp_hostsdeny(-1))) {
484 cgi_setup_error("403 Forbidden", "",
485 "Samba is configured to deny access from this client\n<br>Check your \"hosts allow\" and \"hosts deny\" options in smb.conf ");
488 /* we are a mini-web server. We need to read the request from stdin
489 and handle authentication etc */
490 while (fgets(line
, sizeof(line
)-1, stdin
)) {
491 if (line
[0] == '\r' || line
[0] == '\n') break;
492 if (strnequal(line
,"GET ", 4)) {
494 url
= strdup(&line
[4]);
495 } else if (strnequal(line
,"POST ", 5)) {
498 url
= strdup(&line
[5]);
499 } else if (strnequal(line
,"PUT ", 4)) {
501 cgi_setup_error("400 Bad Request", "",
502 "This server does not accept PUT requests");
503 } else if (strnequal(line
,"Authorization: ", 15)) {
504 authenticated
= cgi_handle_authorization(&line
[15]);
505 } else if (strnequal(line
,"Content-Length: ", 16)) {
506 content_length
= atoi(&line
[16]);
507 } else if (strnequal(line
,"Accept-Language: ", 17)) {
508 web_set_lang(&line
[17]);
510 /* ignore all other requests! */
513 if (auth_required
&& !authenticated
) {
518 cgi_setup_error("400 Bad Request", "",
519 "You must specify a GET or POST request");
523 if ((p
= strchr_m(url
,' ')) || (p
=strchr_m(url
,'\t'))) {
526 while (*url
&& strchr_m("\r\n",url
[strlen(url
)-1])) {
527 url
[strlen(url
)-1] = 0;
530 /* anything following a ? in the URL is part of the query string */
531 if ((p
=strchr_m(url
,'?'))) {
536 string_sub(url
, "/swat/", "", 0);
538 if (url
[0] != '/' && strstr(url
,"..")==0 && file_exist(url
, NULL
)) {
542 printf("HTTP/1.0 200 OK\r\nConnection: close\r\n");
543 printf("Date: %s\r\n", http_timestring(time(NULL
)));
549 /***************************************************************************
550 return the current pages URL
551 ***************************************************************************/
552 const char *cgi_baseurl(void)
557 return getenv("SCRIPT_NAME");
560 /***************************************************************************
561 return the current pages path info
562 ***************************************************************************/
563 const char *cgi_pathinfo(void)
569 r
= getenv("PATH_INFO");
575 /***************************************************************************
576 return the hostname of the client
577 ***************************************************************************/
578 char *cgi_remote_host(void)
581 return get_socket_name(1,False
);
583 return getenv("REMOTE_HOST");
586 /***************************************************************************
587 return the hostname of the client
588 ***************************************************************************/
589 char *cgi_remote_addr(void)
592 return get_socket_addr(1);
594 return getenv("REMOTE_ADDR");
598 /***************************************************************************
599 return True if the request was a POST
600 ***************************************************************************/
601 BOOL
cgi_waspost(void)
606 return strequal(getenv("REQUEST_METHOD"), "POST");