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r14328@Kushana: nickm | 2007-09-04 20:17:34 -0400

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There is no good reason to make hashedcontrolpassword and cookieauthentication mutually exclusive.  So let's not.


svn:r11377
This commit is contained in:
Nick Mathewson 2007-09-05 00:31:07 +00:00
parent 7c47856c9e
commit d57c1c5c56
3 changed files with 61 additions and 37 deletions
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2
ChangeLog
View File

@ -2,6 +2,8 @@ Changes in version 0.2.0.7-alpha - 2007-??-??
o Minor features (security):
- As a client, do not believe any server that tells us that any address
maps to an internal address space.
- Make it possible to enable HashedControlPassword and
CookieAuthentication at the same time.
o Minor features (guard nodes):
- Tag every guard node in our state file with the version that we believe

2
src/or/config.c
View File

@ -2903,8 +2903,6 @@ options_validate(or_options_t *old_options, or_options_t *options,
if (decode_hashed_password(NULL, options->HashedControlPassword)<0)
REJECT("Bad HashedControlPassword: wrong length or bad encoding");
}
if (options->HashedControlPassword && options->CookieAuthentication)
REJECT("Cannot set both HashedControlPassword and CookieAuthentication");
if (options->ControlListenAddress) {
int all_are_local = 1;

94
src/or/control.c
View File

@ -953,6 +953,7 @@ handle_control_authenticate(control_connection_t *conn, uint32_t len,
size_t password_len;
const char *cp;
int i;
int bad_cookie, bad_password;
if (TOR_ISXDIGIT(body[0])) {
cp = body;
@ -984,46 +985,69 @@ handle_control_authenticate(control_connection_t *conn, uint32_t len,
used_quoted_string = 1;
}
if (options->CookieAuthentication) {
if (password_len != AUTHENTICATION_COOKIE_LEN) {
log_warn(LD_CONTROL, "Got authentication cookie with wrong length (%d)",
(int)password_len);
errstr = "Wrong length on authentication cookie.";
goto err;
} else if (memcmp(authentication_cookie, password, password_len)) {
log_warn(LD_CONTROL, "Got mismatched authentication cookie");
errstr = "Authentication cookie did not match expected value.";
goto err;
} else {
goto ok;
}
} else if (options->HashedControlPassword) {
char expected[S2K_SPECIFIER_LEN+DIGEST_LEN];
char received[DIGEST_LEN];
if (decode_hashed_password(expected, options->HashedControlPassword)<0) {
log_warn(LD_CONTROL,
"Couldn't decode HashedControlPassword: invalid base16");
errstr = "Couldn't decode HashedControlPassword value in configuration.";
goto err;
}
secret_to_key(received,DIGEST_LEN,password,password_len,expected);
if (!memcmp(expected+S2K_SPECIFIER_LEN, received, DIGEST_LEN))
goto ok;
if (used_quoted_string)
errstr = "Password did not match HashedControlPassword value from "
"configuration";
else
errstr = "Password did not match HashedControlPassword value from "
"configuration. Maybe you tried a plain text password? "
"If so, the standard requires that you put it in double quotes.";
goto err;
} else {
if (!options->CookieAuthentication && !options->HashedControlPassword) {
/* if Tor doesn't demand any stronger authentication, then
* the controller can get in with anything. */
goto ok;
}
if (options->CookieAuthentication) {
int also_password = options->HashedControlPassword != NULL;
if (password_len != AUTHENTICATION_COOKIE_LEN) {
if (!also_password) {
log_warn(LD_CONTROL, "Got authentication cookie with wrong length (%d)",
(int)password_len);
errstr = "Wrong length on authentication cookie.";
goto err;
}
bad_cookie = 1;
} else if (memcmp(authentication_cookie, password, password_len)) {
if (!also_password) {
log_warn(LD_CONTROL, "Got mismatched authentication cookie");
errstr = "Authentication cookie did not match expected value.";
goto err;
}
bad_cookie = 1;
} else {
goto ok;
}
}
if (options->HashedControlPassword) {
char expected[S2K_SPECIFIER_LEN+DIGEST_LEN];
char received[DIGEST_LEN];
int also_cookie = options->CookieAuthentication;
if (decode_hashed_password(expected, options->HashedControlPassword)<0) {
if (!also_cookie) {
log_warn(LD_CONTROL,
"Couldn't decode HashedControlPassword: invalid base16");
errstr ="Couldn't decode HashedControlPassword value in configuration.";
}
bad_password = 1;
} else {
secret_to_key(received,DIGEST_LEN,password,password_len,expected);
if (!memcmp(expected+S2K_SPECIFIER_LEN, received, DIGEST_LEN))
goto ok;
if (used_quoted_string)
errstr = "Password did not match HashedControlPassword value from "
"configuration";
else
errstr = "Password did not match HashedControlPassword value from "
"configuration. Maybe you tried a plain text password? "
"If so, the standard requires that you put it in double quotes.";
bad_password = 1;
if (!also_cookie)
goto err;
}
}
/** We only get here if both kinds of authentication failed. */
tor_assert(bad_password && bad_cookie);
log_warn(LD_CONTROL, "Bad password or authentication cookie on controller.");
errstr = "Password did not match HashedControlPassword *or* authentication "
"cookie.";
err:
tor_free(password);
if (!errstr)