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/*
* File: domain.c
*
* 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 3 of the License, or
* (at your option) any later version.
*/
#include <stdlib.h>
#include "../dlib/dlib.h"
#include "msg.h"
#include "list.h"
#include "domain.h"
typedef struct {
char *origin;
char *destination;
} Rule;
static Rule *exceptions = NULL;
static int num_exceptions = 0;
static int num_exceptions_max = 1;
static bool_t default_deny = FALSE;
/*
* Parse domainrc.
*/
void a_Domain_parse(FILE *fp)
{
char *line;
uint_t lineno = 0;
_MSG("Reading domainrc...\n");
while ((line = dGetline(fp)) != NULL) {
++lineno;
/* Remove leading and trailing whitespace */
dStrstrip(line);
if (line[0] && line[0] != '#') {
const char *delim = " \t";
char *tok1 = strtok(line, delim);
char *tok2 = strtok(NULL, delim);
if (strtok(NULL, delim) != NULL) {
MSG("Domain: Ignoring extraneous text at end of line %u.\n",
lineno);
}
if (!tok2) {
MSG("Domain: Not enough fields in line %u.\n", lineno);
} else {
if (dStrAsciiCasecmp(tok1, "default") == 0) {
if (dStrAsciiCasecmp(tok2, "deny") == 0) {
default_deny = TRUE;
MSG("Domain: Default deny.\n");
} else if (dStrAsciiCasecmp(tok2, "accept") == 0) {
default_deny = FALSE;
MSG("Domain: Default accept.\n");
} else {
MSG("Domain: Default action \"%s\" not recognised.\n", tok2);
}
} else {
a_List_add(exceptions, num_exceptions, num_exceptions_max);
exceptions[num_exceptions].origin = dStrdup(tok1);
exceptions[num_exceptions].destination = dStrdup(tok2);
num_exceptions++;
_MSG("Domain: Exception from %s to %s.\n", tok1, tok2);
}
}
}
dFree(line);
}
}
void a_Domain_freeall(void)
{
int i = 0;
for (i = 0; i < num_exceptions; i++) {
dFree(exceptions[i].origin);
dFree(exceptions[i].destination);
}
dFree(exceptions);
}
/*
* Wildcard ('*') pattern always matches.
* "example.org" pattern matches "example.org".
* ".example.org" pattern matches "example.org" and "sub.example.org".
*/
static bool_t Domain_match(const char *host, const char *pattern) {
int cmp = strcmp(pattern, "*");
if (cmp) {
if (pattern[0] != '.')
cmp = dStrAsciiCasecmp(host, pattern);
else {
int diff = strlen(host) - strlen(pattern);
if (diff == -1)
cmp = dStrAsciiCasecmp(host, pattern + 1);
else if (diff >= 0)
cmp = dStrAsciiCasecmp(host + diff, pattern);
}
}
return cmp ? FALSE : TRUE;
}
/*
* Is the resource at 'source' permitted to request the resource at 'dest'?
*/
bool_t a_Domain_permit(const DilloUrl *source, const DilloUrl *dest)
{
int i;
bool_t ret;
const char *source_host, *dest_host;
if (default_deny == FALSE && num_exceptions == 0)
return TRUE;
source_host = URL_HOST(source);
dest_host = URL_HOST(dest);
if (dest_host[0] == '\0') {
ret = source_host[0] == '\0' ||
!dStrAsciiCasecmp(URL_SCHEME(dest), "data");
if (ret == FALSE)
MSG("Domain: DENIED %s -> %s.\n", source_host, URL_STR(dest));
return ret;
}
if (a_Url_same_organization(source, dest))
return TRUE;
ret = default_deny ? FALSE : TRUE;
for (i = 0; i < num_exceptions; i++) {
if (Domain_match(source_host, exceptions[i].origin) &&
Domain_match(dest_host, exceptions[i].destination)) {
ret = default_deny;
_MSG("Domain: Matched rule from %s to %s.\n", exceptions[i].origin,
exceptions[i].destination);
break;
}
}
if (ret == FALSE) {
const char *src = source_host[0] ? source_host : URL_STR(source);
MSG("Domain: DENIED %s -> %s.\n", src, dest_host);
}
return ret;
}
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