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Address nickm's comments at https://trac.torproject.org/projects/tor/ticket/933#comment:8

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1. Only allow '*.' in MapAddress expressions. Ignore '*ample.com' and '.example.com'.
       This has resulted in a slight refactoring of config_register_addressmaps.
    2. Add some more detail to the man page entry for AddressMap.
    3. Fix initialization of a pointer to NULL rather than 0.
    4. Update the unit tests to cater for the changes in 1 and test more explicitly for
       recursive mapping.
This commit is contained in:
Robert Hogan 2010-12-27 17:35:16 +00:00 committed by Nick Mathewson
parent 909e9769ec
commit 53ce6bb52d
4 changed files with 96 additions and 40 deletions
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41
doc/tor.1.txt
View File

@ -658,15 +658,42 @@ The following options are useful only for clients (that is, if
When a request for address arrives to Tor, it will rewrite it to newaddress
before processing it. For example, if you always want connections to
www.indymedia.org to exit via __torserver__ (where __torserver__ is the
nickname of the server), use "MapAddress www.indymedia.org
www.indymedia.org.torserver.exit". If the value is prepended with a \'*.\',
it is treated as matching an entire domain. For example, if you always
want connections to any sub-domain of indymedia.org to exit via
nickname of the server), use MapAddress www.indymedia.org
www.indymedia.org.torserver.exit. If the value is prepended with a
'*.', it is treated as matching an entire domain. For example, if you
always want connections to any sub-domain of indymedia.org to exit via
__torserver__ (where __torserver__ is the nickname of the server), use
"MapAddress *.indymedia.org *.indymedia.org.torserver.exit". (Note the
MapAddress *.indymedia.org *.indymedia.org.torserver.exit. (Note the
leading '*.' in each part of the directive.) You can also redirect all
subdomains of a domain to a single address. For example, "MapAddress
*.indymedia.org www.indymedia.org".
subdomains of a domain to a single address. For example, MapAddress
*.indymedia.org www.indymedia.org. +
+
NOTES:
1. When evaluating MapAddress expressions Tor stops when it hits the most
recently added expression that matches the requested address. So if you
have the following in your torrc, www.torproject.org will map to 1.1.1.1:
MapAddress www.torproject.org 2.2.2.2
MapAddress www.torproject.org 1.1.1.1
2. Tor evaluates the MapAddress configuration until it finds no matches. So
if you have the following in your torrc, www.torproject.org will map to
2.2.2.2:
MapAddress www.torproject.org 3.3.3.3
MapAddress 1.1.1.1 4.4.4.4
MapAddress 1.1.1.1 2.2.2.2
MapAddress www.torproject.org 1.1.1.1
3. The following MapAddress expression is invalid (and will be
ignored) because you cannot map from a specific address to a wildcarded
address:
MapAddress www.torproject.org *.torproject.org.torserver.exit
4. Using a wildcard as a regular expression (e.g. *ample.com) is
also invalid.
**NewCircuitPeriod** __NUM__::
Every NUM seconds consider whether to build a new circuit. (Default: 30

62
src/or/config.c
View File

@ -4461,33 +4461,47 @@ config_register_addressmaps(const or_options_t *options)
for (opt = options->AddressMap; opt; opt = opt->next) {
smartlist_split_string(elts, opt->value, NULL,
SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 2);
if (smartlist_len(elts) >= 2) {
from = smartlist_get(elts,0);
to = smartlist_get(elts,1);
/* Remove leading asterisk in expressions of type: '*.example.com' */
if (from[0] == '*' && strlen(from) > 1)
from++;
if (to[0] == '*' && strlen(to) > 1)
to++;
if (to[0] == '.' && from[0] != '.') {
log_warn(LD_CONFIG,
"Skipping invalid argument '%s' to MapAddress: "
"can only use wildcard (i.e. '.' or '*.') if 'from' address "
"uses wildcard also", to);
} else if (address_is_invalid_destination(to, 1)) {
log_warn(LD_CONFIG,
"Skipping invalid argument '%s' to MapAddress", to);
} else {
addressmap_register(from, tor_strdup(to), 0, ADDRMAPSRC_TORRC);
if (smartlist_len(elts)>2) {
log_warn(LD_CONFIG,"Ignoring extra arguments to MapAddress.");
}
}
} else {
if (smartlist_len(elts) < 2) {
log_warn(LD_CONFIG,"MapAddress '%s' has too few arguments. Ignoring.",
opt->value);
goto cleanup;
}
from = smartlist_get(elts,0);
to = smartlist_get(elts,1);
if (to[0] == '.' || from[0] == '.') {
log_warn(LD_CONFIG,"MapAddress '%s' is ambiguous - address starts with a"
"'.'. Ignoring.",opt->value);
goto cleanup;
}
/* Remove leading asterisk in expressions of type: '*.example.com' */
if (!strncmp(from,"*.",2))
from++;
if (!strncmp(to,"*.",2))
to++;
if (to[0] == '.' && from[0] != '.') {
log_warn(LD_CONFIG,
"Skipping invalid argument '%s' to MapAddress: "
"can only use wildcard (i.e. '*.') if 'from' address "
"uses wildcard also", to);
goto cleanup;
}
if (address_is_invalid_destination(to, 1)) {
log_warn(LD_CONFIG,
"Skipping invalid argument '%s' to MapAddress", to);
goto cleanup;
}
addressmap_register(from, tor_strdup(to), 0, ADDRMAPSRC_TORRC);
if (smartlist_len(elts) > 2)
log_warn(LD_CONFIG,"Ignoring extra arguments to MapAddress.");
cleanup:
SMARTLIST_FOREACH(elts, char*, cp, tor_free(cp));
smartlist_clear(elts);
}

2
src/or/connection_edge.c
View File

@ -1052,7 +1052,7 @@ addressmap_match_superdomains(char *address)
const char *key;
void *_val;
addressmap_entry_t *val;
char *matched_domains = 0;
char *matched_domains = NULL;
for (iter = strmap_iter_init(addressmap); !strmap_iter_done(iter); ) {
strmap_iter_get(iter, &key, &_val);

31
src/test/test_config.c
View File

@ -15,9 +15,11 @@ test_config_addressmap(void)
char buf[1024];
char address[256];
time_t expires = TIME_MAX;
strlcpy(buf, "MapAddress .google.com .torserver.exit\n"
strlcpy(buf, "MapAddress .invalidwildcard.com *.torserver.exit\n" // invalid
"MapAddress *invalidasterisk.com *.torserver.exit\n" // invalid
"MapAddress *.google.com *.torserver.exit\n"
"MapAddress *.yahoo.com *.google.com.torserver.exit\n"
"MapAddress .cn.com www.cnn.com\n"
"MapAddress *.cn.com www.cnn.com\n"
"MapAddress *.cnn.com www.cnn.com\n"
"MapAddress ex.com www.cnn.com\n"
"MapAddress ey.com *.cnn.com\n"
@ -27,6 +29,7 @@ test_config_addressmap(void)
"MapAddress test.torproject.org 2.2.2.2\n"
"MapAddress www.google.com 3.3.3.3\n"
"MapAddress www.example.org 4.4.4.4\n"
"MapAddress 4.4.4.4 7.7.7.7\n"
"MapAddress 4.4.4.4 5.5.5.5\n"
"MapAddress www.infiniteloop.org 6.6.6.6\n"
"MapAddress 6.6.6.6 www.infiniteloop.org\n"
@ -35,6 +38,14 @@ test_config_addressmap(void)
config_get_lines(buf, &(get_options()->AddressMap));
config_register_addressmaps(get_options());
/* MapAddress .invalidwildcard.com .torserver.exit - no match */
strlcpy(address, "www.invalidwildcard.com", sizeof(address));
test_assert(!addressmap_rewrite(address, sizeof(address), &expires));
/* MapAddress *invalidasterisk.com .torserver.exit - no match */
strlcpy(address, "www.invalidasterisk.com", sizeof(address));
test_assert(!addressmap_rewrite(address, sizeof(address), &expires));
/* Where no mapping for FQDN match on top-level domain */
/* MapAddress .google.com .torserver.exit */
strlcpy(address, "reader.google.com", sizeof(address));
@ -81,7 +92,11 @@ test_config_addressmap(void)
test_assert(addressmap_rewrite(address, sizeof(address), &expires));
test_streq(address, "2.2.2.2");
/* Test a chain of address mappings */
/* Test a chain of address mappings and the order in which they were added:
"MapAddress www.example.org 4.4.4.4"
"MapAddress 4.4.4.4 7.7.7.7"
"MapAddress 4.4.4.4 5.5.5.5"
*/
strlcpy(address, "www.example.org", sizeof(address));
test_assert(addressmap_rewrite(address, sizeof(address), &expires));
test_streq(address, "5.5.5.5");
@ -97,9 +112,9 @@ test_config_addressmap(void)
/* Test top-level-domain matching a bit harder */
addressmap_clear_configured();
strlcpy(buf, "MapAddress .com .torserver.exit\n"
"MapAddress .torproject.org 1.1.1.1\n"
"MapAddress .net 2.2.2.2\n"
strlcpy(buf, "MapAddress *.com *.torserver.exit\n"
"MapAddress *.torproject.org 1.1.1.1\n"
"MapAddress *.net 2.2.2.2\n"
, sizeof(buf));
config_get_lines(buf, &(get_options()->AddressMap));
config_register_addressmaps(get_options());
@ -124,9 +139,9 @@ test_config_addressmap(void)
test_assert(addressmap_rewrite(address, sizeof(address), &expires));
test_streq(address, "2.2.2.2");
/* We don't support '.' as a mapping directive */
/* We don't support '*' as a mapping directive */
addressmap_clear_configured();
strlcpy(buf, "MapAddress . .torserver.exit\n", sizeof(buf));
strlcpy(buf, "MapAddress * *.torserver.exit\n", sizeof(buf));
config_get_lines(buf, &(get_options()->AddressMap));
config_register_addressmaps(get_options());