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-rw-r--r--source4/web/cgi.c604
1 files changed, 604 insertions, 0 deletions
diff --git a/source4/web/cgi.c b/source4/web/cgi.c
new file mode 100644
index 0000000000..212c2884b6
--- /dev/null
+++ b/source4/web/cgi.c
@@ -0,0 +1,604 @@
+/*
+ some simple CGI helper routines
+ Copyright (C) Andrew Tridgell 1997-1998
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+
+#include "includes.h"
+#include "../web/swat_proto.h"
+
+#define MAX_VARIABLES 10000
+
+/* set the expiry on fixed pages */
+#define EXPIRY_TIME (60*60*24*7)
+
+#ifdef DEBUG_COMMENTS
+extern void print_title(char *fmt, ...);
+#endif
+
+struct var {
+ char *name;
+ char *value;
+};
+
+static struct var variables[MAX_VARIABLES];
+static int num_variables;
+static int content_length;
+static int request_post;
+static char *query_string;
+static const char *baseurl;
+static char *pathinfo;
+static char *C_user;
+static BOOL inetd_server;
+static BOOL got_request;
+
+static char *grab_line(FILE *f, int *cl)
+{
+ char *ret = NULL;
+ int i = 0;
+ int len = 0;
+
+ while ((*cl)) {
+ int c;
+
+ if (i == len) {
+ char *ret2;
+ if (len == 0) len = 1024;
+ else len *= 2;
+ ret2 = (char *)Realloc(ret, len);
+ if (!ret2) return ret;
+ ret = ret2;
+ }
+
+ c = fgetc(f);
+ (*cl)--;
+
+ if (c == EOF) {
+ (*cl) = 0;
+ break;
+ }
+
+ if (c == '\r') continue;
+
+ if (strchr_m("\n&", c)) break;
+
+ ret[i++] = c;
+
+ }
+
+
+ ret[i] = 0;
+ return ret;
+}
+
+/***************************************************************************
+ load all the variables passed to the CGI program. May have multiple variables
+ with the same name and the same or different values. Takes a file parameter
+ for simulating CGI invocation eg loading saved preferences.
+ ***************************************************************************/
+void cgi_load_variables(void)
+{
+ static char *line;
+ char *p, *s, *tok;
+ int len, i;
+ FILE *f = stdin;
+
+#ifdef DEBUG_COMMENTS
+ char dummy[100]="";
+ print_title(dummy);
+ d_printf("<!== Start dump in cgi_load_variables() %s ==>\n",__FILE__);
+#endif
+
+ if (!content_length) {
+ p = getenv("CONTENT_LENGTH");
+ len = p?atoi(p):0;
+ } else {
+ len = content_length;
+ }
+
+
+ if (len > 0 &&
+ (request_post ||
+ ((s=getenv("REQUEST_METHOD")) &&
+ strcasecmp(s,"POST")==0))) {
+ while (len && (line=grab_line(f, &len))) {
+ p = strchr_m(line,'=');
+ if (!p) continue;
+
+ *p = 0;
+
+ variables[num_variables].name = strdup(line);
+ variables[num_variables].value = strdup(p+1);
+
+ SAFE_FREE(line);
+
+ if (!variables[num_variables].name ||
+ !variables[num_variables].value)
+ continue;
+
+ rfc1738_unescape(variables[num_variables].value);
+ rfc1738_unescape(variables[num_variables].name);
+
+#ifdef DEBUG_COMMENTS
+ printf("<!== POST var %s has value \"%s\" ==>\n",
+ variables[num_variables].name,
+ variables[num_variables].value);
+#endif
+
+ num_variables++;
+ if (num_variables == MAX_VARIABLES) break;
+ }
+ }
+
+ fclose(stdin);
+ open("/dev/null", O_RDWR);
+
+ if ((s=query_string) || (s=getenv("QUERY_STRING"))) {
+ for (tok=strtok(s,"&;");tok;tok=strtok(NULL,"&;")) {
+ p = strchr_m(tok,'=');
+ if (!p) continue;
+
+ *p = 0;
+
+ variables[num_variables].name = strdup(tok);
+ variables[num_variables].value = strdup(p+1);
+
+ if (!variables[num_variables].name ||
+ !variables[num_variables].value)
+ continue;
+
+ rfc1738_unescape(variables[num_variables].value);
+ rfc1738_unescape(variables[num_variables].name);
+
+#ifdef DEBUG_COMMENTS
+ printf("<!== Commandline var %s has value \"%s\" ==>\n",
+ variables[num_variables].name,
+ variables[num_variables].value);
+#endif
+ num_variables++;
+ if (num_variables == MAX_VARIABLES) break;
+ }
+
+ }
+#ifdef DEBUG_COMMENTS
+ printf("<!== End dump in cgi_load_variables() ==>\n");
+#endif
+
+ /* variables from the client are in display charset - convert them
+ to our internal charset before use */
+ for (i=0;i<num_variables;i++) {
+ pstring dest;
+
+ convert_string(CH_DISPLAY, CH_UNIX,
+ variables[i].name, -1,
+ dest, sizeof(dest));
+ free(variables[i].name);
+ variables[i].name = strdup(dest);
+
+ convert_string(CH_DISPLAY, CH_UNIX,
+ variables[i].value, -1,
+ dest, sizeof(dest));
+ free(variables[i].value);
+ variables[i].value = strdup(dest);
+ }
+}
+
+
+/***************************************************************************
+ find a variable passed via CGI
+ Doesn't quite do what you think in the case of POST text variables, because
+ if they exist they might have a value of "" or even " ", depending on the
+ browser. Also doesn't allow for variables[] containing multiple variables
+ with the same name and the same or different values.
+ ***************************************************************************/
+const char *cgi_variable(const char *name)
+{
+ int i;
+
+ for (i=0;i<num_variables;i++)
+ if (strcmp(variables[i].name, name) == 0)
+ return variables[i].value;
+ return NULL;
+}
+
+/***************************************************************************
+tell a browser about a fatal error in the http processing
+ ***************************************************************************/
+static void cgi_setup_error(const char *err, const char *header, const char *info)
+{
+ if (!got_request) {
+ /* damn browsers don't like getting cut off before they give a request */
+ char line[1024];
+ while (fgets(line, sizeof(line)-1, stdin)) {
+ if (strncasecmp(line,"GET ", 4)==0 ||
+ strncasecmp(line,"POST ", 5)==0 ||
+ strncasecmp(line,"PUT ", 4)==0) {
+ break;
+ }
+ }
+ }
+
+ 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);
+ fclose(stdin);
+ fclose(stdout);
+ exit(0);
+}
+
+
+/***************************************************************************
+tell a browser about a fatal authentication error
+ ***************************************************************************/
+static void cgi_auth_error(void)
+{
+ if (inetd_server) {
+ cgi_setup_error("401 Authorization Required",
+ "WWW-Authenticate: Basic realm=\"SWAT\"\r\n",
+ "You must be authenticated to use this service");
+ } else {
+ printf("Content-Type: text/html\r\n");
+
+ printf("\r\n<HTML><HEAD><TITLE>SWAT</TITLE></HEAD>\n");
+ printf("<BODY><H1>Installation Error</H1>\n");
+ printf("SWAT must be installed via inetd. It cannot be run as a CGI script<p>\n");
+ printf("</BODY></HTML>\r\n");
+ }
+ exit(0);
+}
+
+/***************************************************************************
+authenticate when we are running as a CGI
+ ***************************************************************************/
+static void cgi_web_auth(void)
+{
+ const char *user = getenv("REMOTE_USER");
+ struct passwd *pwd;
+ const char *head = "Content-Type: text/html\r\n\r\n<HTML><BODY><H1>SWAT installation Error</H1>\n";
+ const char *tail = "</BODY></HTML>\r\n";
+
+ if (!user) {
+ printf("%sREMOTE_USER not set. Not authenticated by web server.<br>%s\n",
+ head, tail);
+ exit(0);
+ }
+
+ pwd = getpwnam_alloc(user);
+ if (!pwd) {
+ printf("%sCannot find user %s<br>%s\n", head, user, tail);
+ exit(0);
+ }
+
+ setuid(0);
+ setuid(pwd->pw_uid);
+ if (geteuid() != pwd->pw_uid || getuid() != pwd->pw_uid) {
+ printf("%sFailed to become user %s - uid=%d/%d<br>%s\n",
+ head, user, (int)geteuid(), (int)getuid(), tail);
+ exit(0);
+ }
+ passwd_free(&pwd);
+}
+
+
+/***************************************************************************
+handle a http authentication line
+ ***************************************************************************/
+static BOOL cgi_handle_authorization(char *line)
+{
+ char *p;
+ fstring user, user_pass;
+ struct passwd *pass = NULL;
+
+ if (strncasecmp(line,"Basic ", 6)) {
+ goto err;
+ }
+ line += 6;
+ while (line[0] == ' ') line++;
+ base64_decode_inplace(line);
+ if (!(p=strchr_m(line,':'))) {
+ /*
+ * Always give the same error so a cracker
+ * cannot tell why we fail.
+ */
+ goto err;
+ }
+ *p = 0;
+
+ convert_string(CH_DISPLAY, CH_UNIX,
+ line, -1,
+ user, sizeof(user));
+
+ convert_string(CH_DISPLAY, CH_UNIX,
+ p+1, -1,
+ user_pass, sizeof(user_pass));
+
+ /*
+ * Try and get the user from the UNIX password file.
+ */
+
+ pass = getpwnam_alloc(user);
+
+ /*
+ * Validate the password they have given.
+ */
+
+ if NT_STATUS_IS_OK(pass_check(pass, user, user_pass,
+ strlen(user_pass), NULL, False)) {
+
+ if (pass) {
+ /*
+ * Password was ok.
+ */
+
+ become_user_permanently(pass->pw_uid, pass->pw_gid);
+
+ /* Save the users name */
+ C_user = strdup(user);
+ passwd_free(&pass);
+ return True;
+ }
+ }
+
+err:
+ cgi_setup_error("401 Bad Authorization", "",
+ "username or password incorrect");
+
+ passwd_free(&pass);
+ return False;
+}
+
+/***************************************************************************
+is this root?
+ ***************************************************************************/
+BOOL am_root(void)
+{
+ if (geteuid() == 0) {
+ return( True);
+ } else {
+ return( False);
+ }
+}
+
+/***************************************************************************
+return a ptr to the users name
+ ***************************************************************************/
+char *cgi_user_name(void)
+{
+ return(C_user);
+}
+
+
+/***************************************************************************
+handle a file download
+ ***************************************************************************/
+static void cgi_download(char *file)
+{
+ SMB_STRUCT_STAT st;
+ char buf[1024];
+ int fd, l, i;
+ char *p;
+ char *lang;
+
+ /* sanitise the filename */
+ for (i=0;file[i];i++) {
+ if (!isalnum((int)file[i]) && !strchr_m("/.-_", file[i])) {
+ cgi_setup_error("404 File Not Found","",
+ "Illegal character in filename");
+ }
+ }
+
+ if (!file_exist(file, &st)) {
+ cgi_setup_error("404 File Not Found","",
+ "The requested file was not found");
+ }
+
+ fd = web_open(file,O_RDONLY,0);
+ if (fd == -1) {
+ cgi_setup_error("404 File Not Found","",
+ "The requested file was not found");
+ }
+ printf("HTTP/1.0 200 OK\r\n");
+ if ((p=strrchr_m(file,'.'))) {
+ if (strcmp(p,".gif")==0) {
+ printf("Content-Type: image/gif\r\n");
+ } else if (strcmp(p,".jpg")==0) {
+ printf("Content-Type: image/jpeg\r\n");
+ } else if (strcmp(p,".txt")==0) {
+ printf("Content-Type: text/plain\r\n");
+ } else {
+ printf("Content-Type: text/html\r\n");
+ }
+ }
+ printf("Expires: %s\r\n", http_timestring(time(NULL)+EXPIRY_TIME));
+
+ lang = lang_tdb_current();
+ if (lang) {
+ printf("Content-Language: %s\r\n", lang);
+ }
+
+ printf("Content-Length: %d\r\n\r\n", (int)st.st_size);
+ while ((l=read(fd,buf,sizeof(buf)))>0) {
+ fwrite(buf, 1, l, stdout);
+ }
+ close(fd);
+ exit(0);
+}
+
+
+
+
+/**
+ * @brief Setup the CGI framework.
+ *
+ * Setup the cgi framework, handling the possibility that this program
+ * is either run as a true CGI program with a gateway to a web server, or
+ * is itself a mini web server.
+ **/
+void cgi_setup(const char *rootdir, int auth_required)
+{
+ BOOL authenticated = False;
+ char line[1024];
+ char *url=NULL;
+ char *p;
+ char *lang;
+
+ if (chdir(rootdir)) {
+ cgi_setup_error("500 Server Error", "",
+ "chdir failed - the server is not configured correctly");
+ }
+
+ /* Handle the possibility we might be running as non-root */
+ sec_init();
+
+ if ((lang=getenv("HTTP_ACCEPT_LANGUAGE"))) {
+ /* if running as a cgi program */
+ web_set_lang(lang);
+ }
+
+ /* maybe we are running under a web server */
+ if (getenv("CONTENT_LENGTH") || getenv("REQUEST_METHOD")) {
+ if (auth_required) {
+ cgi_web_auth();
+ }
+ return;
+ }
+
+ inetd_server = True;
+
+ if (!check_access(1, lp_hostsallow(-1), lp_hostsdeny(-1))) {
+ cgi_setup_error("403 Forbidden", "",
+ "Samba is configured to deny access from this client\n<br>Check your \"hosts allow\" and \"hosts deny\" options in smb.conf ");
+ }
+
+ /* we are a mini-web server. We need to read the request from stdin
+ and handle authentication etc */
+ while (fgets(line, sizeof(line)-1, stdin)) {
+ if (line[0] == '\r' || line[0] == '\n') break;
+ if (strncasecmp(line,"GET ", 4)==0) {
+ got_request = True;
+ url = strdup(&line[4]);
+ } else if (strncasecmp(line,"POST ", 5)==0) {
+ got_request = True;
+ request_post = 1;
+ url = strdup(&line[5]);
+ } else if (strncasecmp(line,"PUT ", 4)==0) {
+ got_request = True;
+ cgi_setup_error("400 Bad Request", "",
+ "This server does not accept PUT requests");
+ } else if (strncasecmp(line,"Authorization: ", 15)==0) {
+ authenticated = cgi_handle_authorization(&line[15]);
+ } else if (strncasecmp(line,"Content-Length: ", 16)==0) {
+ content_length = atoi(&line[16]);
+ } else if (strncasecmp(line,"Accept-Language: ", 17)==0) {
+ web_set_lang(&line[17]);
+ }
+ /* ignore all other requests! */
+ }
+
+ if (auth_required && !authenticated) {
+ cgi_auth_error();
+ }
+
+ if (!url) {
+ cgi_setup_error("400 Bad Request", "",
+ "You must specify a GET or POST request");
+ }
+
+ /* trim the URL */
+ if ((p = strchr_m(url,' ')) || (p=strchr_m(url,'\t'))) {
+ *p = 0;
+ }
+ while (*url && strchr_m("\r\n",url[strlen(url)-1])) {
+ url[strlen(url)-1] = 0;
+ }
+
+ /* anything following a ? in the URL is part of the query string */
+ if ((p=strchr_m(url,'?'))) {
+ query_string = p+1;
+ *p = 0;
+ }
+
+ string_sub(url, "/swat/", "", 0);
+
+ if (url[0] != '/' && strstr(url,"..")==0 && file_exist(url, NULL)) {
+ cgi_download(url);
+ }
+
+ printf("HTTP/1.0 200 OK\r\nConnection: close\r\n");
+ printf("Date: %s\r\n", http_timestring(time(NULL)));
+ baseurl = "";
+ pathinfo = url+1;
+}
+
+
+/***************************************************************************
+return the current pages URL
+ ***************************************************************************/
+const char *cgi_baseurl(void)
+{
+ if (inetd_server) {
+ return baseurl;
+ }
+ return getenv("SCRIPT_NAME");
+}
+
+/***************************************************************************
+return the current pages path info
+ ***************************************************************************/
+const char *cgi_pathinfo(void)
+{
+ char *r;
+ if (inetd_server) {
+ return pathinfo;
+ }
+ r = getenv("PATH_INFO");
+ if (!r) return "";
+ if (*r == '/') r++;
+ return r;
+}
+
+/***************************************************************************
+return the hostname of the client
+ ***************************************************************************/
+char *cgi_remote_host(void)
+{
+ if (inetd_server) {
+ return get_socket_name(1,False);
+ }
+ return getenv("REMOTE_HOST");
+}
+
+/***************************************************************************
+return the hostname of the client
+ ***************************************************************************/
+char *cgi_remote_addr(void)
+{
+ if (inetd_server) {
+ return get_socket_addr(1);
+ }
+ return getenv("REMOTE_ADDR");
+}
+
+
+/***************************************************************************
+return True if the request was a POST
+ ***************************************************************************/
+BOOL cgi_waspost(void)
+{
+ if (inetd_server) {
+ return request_post;
+ }
+ return strequal(getenv("REQUEST_METHOD"), "POST");
+}
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