first public release of samba4 code

(This used to be commit b0510b5428b3461aeb9bbe3cc95f62fc73e2b97f)

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");
+}