this new cgi code includes the ability to act as a mini web server,

allowing people to use web configuration of Samba without installing a
web server
(This used to be commit b4e05c360e77cbf27a95920b613bfe6bc874ea1b)

1 files changed, 510 insertions, 67 deletions

diff --git a/source3/cgi.c b/source3/cgi.c
index 56c293985d..3739d712d3 100644
--- a/source3/cgi.c
+++ b/source3/cgi.c
@@ -1,6 +1,4 @@
 /* 
-   Unix SMB/Netbios implementation.
-   Version 1.9.
    some simple CGI helper routines
    Copyright (C) Andrew Tridgell 1997
    
@@ -20,9 +18,19 @@
 */
 
 
-#include "includes.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <string.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <pwd.h>
 
-#define MAX_VARIABLES 512
+#define MAX_VARIABLES 10000
+
+#ifdef DEBUG_COMMENTS
+extern void print_title(char *fmt, ...);
+#endif
 
 struct var {
 	char *name;
@@ -31,14 +39,60 @@ struct var {
 
 static struct var variables[MAX_VARIABLES];
 static int num_variables;
+static int content_length;
+static int request_post;
+static int request_get;
+static char *query_string;
+
+static void unescape(char *buf)
+{
+	char *p=buf;
+
+	while ((p=strchr(p,'+')))
+		*p = ' ';
+
+	p = buf;
+
+	while (p && *p && (p=strchr(p,'%'))) {
+		int c1 = p[1];
+		int c2 = p[2];
+
+		if (c1 >= '0' && c1 <= '9')
+			c1 = c1 - '0';
+		else if (c1 >= 'A' && c1 <= 'F')
+			c1 = 10 + c1 - 'A';
+		else if (c1 >= 'a' && c1 <= 'f')
+			c1 = 10 + c1 - 'a';
+		else {p++; continue;}
+
+		if (c2 >= '0' && c2 <= '9')
+			c2 = c2 - '0';
+		else if (c2 >= 'A' && c2 <= 'F')
+			c2 = 10 + c2 - 'A';
+		else if (c2 >= 'a' && c2 <= 'f')
+			c2 = 10 + c2 - 'a';
+		else {p++; continue;}
+			
+		*p = (c1<<4) | c2;
+
+		memcpy(p+1, p+3, strlen(p+3)+1);
+		p++;
+	}
+}
 
 
-static int grab_line(int *cl, char *line, int maxsize)
+static char *grab_line(FILE *f, int *cl)
 {
+	char *ret;
 	int i = 0;
+	int len = 1024;
+
+	ret = (char *)malloc(len);
+	if (!ret) return NULL;
+	
 
 	while ((*cl)) {
-		int c = fgetc(stdin);
+		int c = fgetc(f);
 		(*cl)--;
 
 		if (c == EOF) {
@@ -46,98 +100,140 @@ static int grab_line(int *cl, char *line, int maxsize)
 			break;
 		}
 		
-		if (c == '+') {
-			c = ' ';
-		}
-
 		if (c == '\r') continue;
 
 		if (strchr("\n&", c)) break;
 
-		if (c == '%' && (*cl) >= 2) {
-			int c1, c2;
-			c1 = fgetc(stdin);
-			c2 = fgetc(stdin);
-			(*cl) -= 2;
-			if (c1 == EOF || c2 == EOF) break;
-			if (c1 >= '0' && c1 <= '9')
-				c1 = c1 - '0';
-			else if (c1 >= 'A' && c1 <= 'F')
-				c1 = 10 + c1 - 'A';
-			else if (c1 >= 'a' && c1 <= 'f')
-				c1 = 10 + c1 - 'a';
-			else break;
-
-			if (c2 >= '0' && c2 <= '9')
-				c2 = c2 - '0';
-			else if (c2 >= 'A' && c2 <= 'F')
-				c2 = 10 + c2 - 'A';
-			else if (c2 >= 'a' && c2 <= 'f')
-				c2 = 10 + c2 - 'a';
-			else break;
-			
-			c = (c1<<4) | c2;
-		}
-
-		line[i++] = c;
+		ret[i++] = c;
 
-		if (i == maxsize) break;
+		if (i == len-1) {
+			char *ret2;
+			ret2 = (char *)realloc(ret, len*2);
+			if (!ret2) return ret;
+			len *= 2;
+			ret = ret2;
+		}
 	}
-
-	/* now unescape the line */
 	
 
-	line[i] = 0;
-	return 1;
+	ret[i] = 0;
+	return ret;
 }
 
-
 /***************************************************************************
-  load all the variables passed to the CGI program
+  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)
+void cgi_load_variables(FILE *f1)
 {
-	static pstring line;
-	char *p;	
+	FILE *f = f1;
+	static char *line;
+	char *p, *s, *tok;
 	int len;
 
-	if (!(p=getenv("CONTENT_LENGTH"))) return;
+#ifdef DEBUG_COMMENTS
+	char dummy[100]="";
+	print_title(dummy);
+	printf("<!== Start dump in cgi_load_variables() %s ==>\n",__FILE__);
+#endif
 
-	len = atoi(p);
+	if (!f1) {
+		f = stdin;
+		if (!content_length) {
+			p = getenv("CONTENT_LENGTH");
+			len = p?atoi(p):0;
+		} else {
+			len = content_length;
+		}
+	} else {
+		fseek(f, 0, SEEK_END);
+		len = ftell(f);
+		fseek(f, 0, SEEK_SET);
+	}
 
-	if (len <= 0) return;
 
-	
+	if (len > 0 && 
+	    (f1 || request_post ||
+	     ((s=getenv("REQUEST_METHOD")) && 
+	      strcasecmp(s,"POST")==0))) {
+		while (len && (line=grab_line(f, &len))) {
+			p = strchr(line,'=');
+			if (!p) continue;
+			
+			*p = 0;
+			
+			variables[num_variables].name = strdup(line);
+			variables[num_variables].value = strdup(p+1);
 
-	while (len && grab_line(&len, line, sizeof(line)-1)) {		
-		p = strchr(line,'=');
-		if (!p) continue;
+			free(line);
+			
+			if (!variables[num_variables].name || 
+			    !variables[num_variables].value)
+				continue;
 
-		*p = 0;
+			unescape(variables[num_variables].value);
+			unescape(variables[num_variables].name);
 
-		variables[num_variables].name = strdup(line);
-		variables[num_variables].value = strdup(p+1);
-		
-		if (!variables[num_variables].name || 
-		    !variables[num_variables].value)
-			continue;
-
-#if 0
-		printf("%s=%s<br>\n", 
-		       variables[num_variables].name,
-		       variables[num_variables].value);
+#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;
+		}
+	}
 
-		num_variables++;
-		if (num_variables == MAX_VARIABLES) break;
+	if (f1) {
+#ifdef DEBUG_COMMENTS
+	        printf("<!== End dump in cgi_load_variables() ==>\n"); 
+#endif
+		return;
 	}
 
 	fclose(stdin);
+
+	if ((s=query_string) || (s=getenv("QUERY_STRING"))) {
+		for (tok=strtok(s,"&;");tok;tok=strtok(NULL,"&;")) {
+			p = strchr(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;
+
+			unescape(variables[num_variables].value);
+			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
 }
 
 
 /***************************************************************************
   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.
   ***************************************************************************/
 char *cgi_variable(char *name)
 {
@@ -149,6 +245,15 @@ char *cgi_variable(char *name)
 	return NULL;
 }
 
+/***************************************************************************
+return a particular cgi variable
+  ***************************************************************************/
+char *cgi_vnum(int i, char **name)
+{
+	if (i < 0 || i >= num_variables) return NULL;
+	*name = variables[i].name;
+	return variables[i].value;
+}
 
 /***************************************************************************
   return the value of a CGI boolean variable.
@@ -161,3 +266,341 @@ int cgi_boolean(char *name, int def)
 
 	return strcmp(p, "1") == 0;
 }
+
+/***************************************************************************
+like strdup() but quotes < > and &
+  ***************************************************************************/
+char *quotedup(char *s)
+{
+	int i, n=0;
+	int len;
+	char *ret;
+	char *d;
+
+	if (!s) return strdup("");
+
+	len = strlen(s);
+
+	for (i=0;i<len;i++)
+		if (s[i] == '<' || s[i] == '>' || s[i] == '&')
+			n++;
+
+	ret = malloc(len + n*6 + 1);
+
+	if (!ret) return NULL;
+
+	d = ret;
+
+	for (i=0;i<len;i++) {
+		switch (s[i]) {
+		case '<':
+			strcpy(d, "&lt;");
+			d += 4;
+			break;
+
+		case '>':
+			strcpy(d, "&gt;");
+			d += 4;
+			break;
+
+		case '&':
+			strcpy(d, "&amp;");
+			d += 5;
+			break;
+
+		default:
+			*d++ = s[i];
+		}
+	}
+
+	*d = 0;
+
+	return ret;
+}
+
+
+/***************************************************************************
+like strdup() but quotes a wide range of characters
+  ***************************************************************************/
+char *urlquote(char *s)
+{
+	int i, n=0;
+	int len;
+	char *ret;
+	char *d;
+	char *qlist = "\"\n\r'&<> \t+;";
+
+	if (!s) return strdup("");
+
+	len = strlen(s);
+
+	for (i=0;i<len;i++)
+		if (strchr(qlist, s[i])) n++;
+
+	ret = malloc(len + n*2 + 1);
+
+	if (!ret) return NULL;
+
+	d = ret;
+
+	for (i=0;i<len;i++) {
+		if (strchr(qlist,s[i])) {
+			sprintf(d, "%%%02X", (int)s[i]);
+			d += 3;
+		} else {
+			*d++ = s[i];
+		}
+	}
+
+	*d = 0;
+
+	return ret;
+}
+
+
+/***************************************************************************
+like strdup() but quotes " characters
+  ***************************************************************************/
+char *quotequotes(char *s)
+{
+	int i, n=0;
+	int len;
+	char *ret;
+	char *d;
+
+	if (!s) return strdup("");
+
+	len = strlen(s);
+
+	for (i=0;i<len;i++)
+		if (s[i] == '"')
+			n++;
+
+	ret = malloc(len + n*6 + 1);
+
+	if (!ret) return NULL;
+
+	d = ret;
+
+	for (i=0;i<len;i++) {
+		switch (s[i]) {
+		case '"':
+			strcpy(d, "&quot;");
+			d += 6;
+			break;
+
+		default:
+			*d++ = s[i];
+		}
+	}
+
+	*d = 0;
+
+	return ret;
+}
+
+
+/***************************************************************************
+quote spaces in a buffer
+  ***************************************************************************/
+void quote_spaces(char *buf)
+{
+	while (*buf) {
+		if (*buf == ' ') *buf = '+';
+		buf++;
+	}
+}
+
+
+
+/***************************************************************************
+tell a browser about a fatal error in the http processing
+  ***************************************************************************/
+static void cgi_setup_error(char *err, char *header, char *info)
+{
+	printf("HTTP/1.1 %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", err, header, err, err, info);
+	exit(0);
+}
+
+
+/***************************************************************************
+decode a base64 string in-place - simple and slow algorithm
+  ***************************************************************************/
+static void base64_decode(char *s)
+{
+	char *b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+	int bit_offset, byte_offset, idx, i;
+	unsigned char *d = (unsigned char *)s;
+	char *p;
+
+	i=0;
+
+	while (*s && (p=strchr(b64,*s))) {
+		idx = (int)(p - b64);
+		byte_offset = (i*6)/8;
+		bit_offset = (i*6)%8;
+		d[byte_offset] &= ~((1<<(8-bit_offset))-1);
+		if (bit_offset < 3) {
+			d[byte_offset] |= (idx << (2-bit_offset));
+		} else {
+			d[byte_offset] |= (idx >> (bit_offset-2));
+			d[byte_offset+1] = 0;
+			d[byte_offset+1] |= (idx << (8-(bit_offset-2))) & 0xFF;
+		}
+		s++; i++;
+	}
+}
+
+
+/***************************************************************************
+handle a http authentication line
+  ***************************************************************************/
+static int cgi_handle_authorization(char *line)
+{
+	char *p, *user, *pass;
+	struct passwd *pwd;
+	int ret=0;
+
+	if (strncasecmp(line,"Basic ", 6)) {
+		cgi_setup_error("401 Bad Authorization", "", 
+				"Only basic authorization is understood");
+	}
+	line += 6;
+	while (line[0] == ' ') line++;
+	base64_decode(line);
+	if (!(p=strchr(line,':'))) {
+		cgi_setup_error("401 Bad Authorization", "", 
+				"username/password must be supplied");
+	}
+	*p = 0;
+	user = line;
+	pass = p+1;
+
+	/* currently only allow connections as root */
+	if (strcasecmp(user,"root")) {
+		cgi_setup_error("401 Bad Authorization", "", 
+				"incorrect username/password");
+	}
+	
+	pwd = getpwnam(user);
+
+	if (!strcmp((char *)crypt(pass, pwd->pw_passwd),pwd->pw_passwd)) {
+		ret = 1;
+	}
+
+	memset(pass, 0, strlen(pass));
+
+	return ret;
+}
+
+
+/***************************************************************************
+handle a file download
+  ***************************************************************************/
+static void cgi_download(char *file)
+{
+	struct stat st;
+	char buf[1024];
+	int fd, l;
+	char *p;
+
+	if (!file_exist(file, &st)) {
+		cgi_setup_error("404 File Not Found","",
+				"The requested file was not found");
+	}
+	fd = open(file,O_RDONLY);
+	if (fd == -1) {
+		cgi_setup_error("404 File Not Found","",
+				"The requested file was not found");
+	}
+	printf("HTTP/1.1 200 OK\r\n");
+	if ((p=strrchr(file,'.'))) {
+		if (strcmp(p,".gif")==0 || strcmp(p,".jpg")==0) {
+			printf("Content-Type: image/gif\r\n");
+		} else {
+			printf("Content-Type: text/html\r\n");
+		}
+	}
+	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);
+}
+
+
+/***************************************************************************
+setup the cgi framework, handling the possability that this program is either
+run as a true cgi program by a web browser or is itself a mini web server
+  ***************************************************************************/
+void cgi_setup(char *rootdir)
+{
+	int authenticated = 0;
+	char line[1024];
+	char *url=NULL;
+	char *p;
+
+	if (chdir(rootdir)) {
+		cgi_setup_error("400 Server Error", "",
+				"chdir failed - the server is not configured correctly");
+	}
+
+	if (getenv("CONTENT_LENGTH") || getenv("REQUEST_METHOD")) {
+		/* assume we are running under a real web server */
+		return;
+	}
+
+	/* 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) {
+			request_get = 1;
+			url = strdup(&line[4]);
+		} else if (strncasecmp(line,"POST ", 5)==0) {
+			request_post = 1;
+			url = strdup(&line[5]);
+		} else if (strncasecmp(line,"PUT ", 4)==0) {
+			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]);
+		}
+		/* ignore all other requests! */
+	}
+
+	if (!authenticated) {
+		cgi_setup_error("401 Authorization Required", 
+				"WWW-Authenticate: Basic realm=\"samba\"\r\n",
+				"You must be authenticated to use this service");
+	}
+
+	if (!url) {
+		cgi_setup_error("400 Bad Request", "",
+				"You must specify a GET or POST request");
+	}
+
+	/* trim the URL */
+	if ((p = strchr(url,' ')) || (p=strchr(url,'\t'))) {
+		*p = 0;
+	}
+	while (*url && strchr("\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(url,'?'))) {
+		query_string = p+1;
+		*p = 0;
+	}
+
+	if (strcmp(url,"/")) {
+		cgi_download(url+1);
+	}
+
+	printf("HTTP/1.1 200 OK\r\nConnection: close\r\nContent-Type: text/html\r\n\r\n");
+	
+}