/* oCpyright (c) 2001 Matej Pfajfar.
* Copyright (c) 2001-2004, Roger Dingledine.
* Copyright (c) 2004-2007, Roger Dingledine, Nick Mathewson. */
/* See LICENSE for licensing information */
/* $Id$ */
const char routerparse_c_id[] =
"$Id$";
/**
* \file routerparse.c
* \brief Code to parse and validate router descriptors and directories.
**/
#include "or.h"
/****************************************************************************/
/** Enumeration of possible token types. The ones starting with K_
* correspond to directory 'keywords'. _UNRECOGNIZED is for an
* unrecognized keyword; _ERR is an error in the tokenizing process,
* _EOF is an end-of-file marker, and _NIL is used to encode
* not-a-token.
*/
typedef enum {
K_ACCEPT = 0,
K_DIRECTORY_SIGNATURE,
K_RECOMMENDED_SOFTWARE,
K_REJECT,
K_ROUTER,
K_SIGNED_DIRECTORY,
K_SIGNING_KEY,
K_ONION_KEY,
K_ROUTER_SIGNATURE,
K_PUBLISHED,
K_RUNNING_ROUTERS,
K_ROUTER_STATUS,
K_PLATFORM,
K_OPT,
K_BANDWIDTH,
K_PORTS,
K_CONTACT,
K_NETWORK_STATUS,
K_UPTIME,
K_DIR_SIGNING_KEY,
K_FAMILY,
K_FINGERPRINT,
K_HIBERNATING,
K_READ_HISTORY,
K_WRITE_HISTORY,
K_NETWORK_STATUS_VERSION,
K_DIR_SOURCE,
K_DIR_OPTIONS,
K_CLIENT_VERSIONS,
K_SERVER_VERSIONS,
K_R,
K_S,
K_V,
K_EVENTDNS,
K_EXTRA_INFO,
K_EXTRA_INFO_DIGEST,
K_CACHES_EXTRA_INFO,
K_DIR_KEY_CERTIFICATE_VERSION,
K_DIR_IDENTITY_KEY,
K_DIR_KEY_PUBLISHED,
K_DIR_KEY_EXPIRES,
K_DIR_KEY_CERTIFICATION,
K_VOTE_STATUS,
K_VALID_AFTER,
K_FRESH_UNTIL,
K_VALID_UNTIL,
K_VOTING_DELAY,
K_KNOWN_FLAGS,
K_VOTE_DIGEST,
K_CONSENSUS_DIGEST,
_UNRECOGNIZED,
_ERR,
_EOF,
_NIL
} directory_keyword;
/** Structure to hold a single directory token.
*
* We parse a directory by breaking it into "tokens", each consisting
* of a keyword, a line full of arguments, and a binary object. The
* arguments and object are both optional, depending on the keyword
* type.
*/
typedef struct directory_token_t {
directory_keyword tp; /**< Type of the token. */
int n_args; /**< Number of elements in args */
char **args; /**< Array of arguments from keyword line. */
char *object_type; /**< -----BEGIN [object_type]-----*/
size_t object_size; /**< Bytes in object_body */
char *object_body; /**< Contents of object, base64-decoded. */
crypto_pk_env_t *key; /**< For public keys only. */
char *error; /**< For _ERR tokens only. */
} directory_token_t;
/* ********************************************************************** */
/** We use a table of rules to decide how to parse each token type. */
/** Rules for whether the keyword needs an object. */
typedef enum {
NO_OBJ, /**< No object, ever. */
NEED_OBJ, /**< Object is required. */
NEED_KEY_1024, /**< Object is required, and must be a 1024 bit public key */
NEED_KEY, /**< Object is required, and must be a public key. */
OBJ_OK, /**< Object is optional. */
} obj_syntax;
#define AT_START 1
#define AT_END 2
/** Determines the parsing rules for a single token type. */
typedef struct token_rule_t {
/** The string value of the keyword identifying the type of item. */
const char *t;
/** The corresponding directory_keyword enum. */
directory_keyword v;
/** Minimum number of arguments for this item */
int min_args;
/** Maximum number of arguments for this item */
int max_args;
/** If true, we concatenate all arguments for this item into a single
* string. */
int concat_args;
/** Requirments on object syntax for this item. */
obj_syntax os;
/** Lowest number of times this item may appear in a document. */
int min_cnt;
/** Highest number of times this item may appear in a document. */
int max_cnt;
/** One or more of AT_START/AT_END to limit where the item may appear in a
* document. */
int pos;
} token_rule_t;
/*
* Helper macros to define token tables. 's' is a string, 't' is a
* directory_keyword, 'a' is a trio of argument multiplicities, and 'o' is an
* object syntax.
*
*/
/** Appears to indicate the end of a table. */
#define END_OF_TABLE { NULL, _NIL, 0,0,0, NO_OBJ, 0, INT_MAX, 0 }
/** An item with no restrictions: used for obsolete document types */
#define T(s,t,a,o) { s, t, a, o, 0, INT_MAX, 0 }
/** An item with no restrictions on multiplicity or location. */
#define T0N(s,t,a,o) { s, t, a, o, 0, INT_MAX, 0 }
/** An item that must appear exactly once */
#define T1(s,t,a,o) { s, t, a, o, 1, 1, 0 }
/** An item that must appear exactly once, at the start of the document */
#define T1_START(s,t,a,o) { s, t, a, o, 1, 1, AT_START }
/** An item that must appear exactly once, at the end of the document */
#define T1_END(s,t,a,o) { s, t, a, o, 1, 1, AT_END }
/** An item that must appear one or more times */
#define T1N(s,t,a,o) { s, t, a, o, 1, INT_MAX, 0 }
/** An item that must appear no more than once */
#define T01(s,t,a,o) { s, t, a, o, 0, 1, 0 }
/* Argument multiplicity: any number of arguments. */
#define ARGS 0,INT_MAX,0
/* Argument multiplicity: no arguments. */
#define NO_ARGS 0,0,0
/* Argument multiplicity: concatenate all arguments. */
#define CONCAT_ARGS 1,1,1
/* Argument multiplicity: at least n arguments. */
#define GE(n) n,INT_MAX,0
/* Argument multiplicity: exactly n arguments. */
#define EQ(n) n,n,0
/** List of tokens allowable in router derscriptors */
static token_rule_t routerdesc_token_table[] = {
T0N("reject", K_REJECT, ARGS, NO_OBJ ),
T0N("accept", K_ACCEPT, ARGS, NO_OBJ ),
T1_START( "router", K_ROUTER, GE(5), NO_OBJ ),
T1( "signing-key", K_SIGNING_KEY, NO_ARGS, NEED_KEY_1024 ),
T1( "onion-key", K_ONION_KEY, NO_ARGS, NEED_KEY_1024 ),
T1_END( "router-signature", K_ROUTER_SIGNATURE, NO_ARGS, NEED_OBJ ),
T1( "published", K_PUBLISHED, CONCAT_ARGS, NO_OBJ ),
T01("uptime", K_UPTIME, GE(1), NO_OBJ ),
T01("fingerprint", K_FINGERPRINT, CONCAT_ARGS, NO_OBJ ),
T01("hibernating", K_HIBERNATING, GE(1), NO_OBJ ),
T01("platform", K_PLATFORM, CONCAT_ARGS, NO_OBJ ),
T01("contact", K_CONTACT, CONCAT_ARGS, NO_OBJ ),
T01("read-history", K_READ_HISTORY, ARGS, NO_OBJ ),
T01("write-history", K_WRITE_HISTORY, ARGS, NO_OBJ ),
T01("extra-info-digest", K_EXTRA_INFO_DIGEST, GE(1), NO_OBJ ),
T01("family", K_FAMILY, ARGS, NO_OBJ ),
T01("caches-extra-info", K_CACHES_EXTRA_INFO, NO_ARGS, NO_OBJ ),
T01("eventdns", K_EVENTDNS, ARGS, NO_OBJ ),
T0N("opt", K_OPT, CONCAT_ARGS, OBJ_OK ),
T1( "bandwidth", K_BANDWIDTH, GE(3), NO_OBJ ),
END_OF_TABLE
};
/** List of tokens allowable in extra-info documents. */
static token_rule_t extrainfo_token_table[] = {
T1_END( "router-signature", K_ROUTER_SIGNATURE, NO_ARGS, NEED_OBJ ),
T1( "published", K_PUBLISHED, CONCAT_ARGS, NO_OBJ ),
T0N("opt", K_OPT, CONCAT_ARGS, OBJ_OK ),
T01("read-history", K_READ_HISTORY, ARGS, NO_OBJ ),
T01("write-history", K_WRITE_HISTORY, ARGS, NO_OBJ ),
T1_START( "extra-info", K_EXTRA_INFO, GE(2), NO_OBJ ),
END_OF_TABLE
};
/** List of tokens allowable in the body part of v2 and v3 networkstatus
* documents. */
static token_rule_t rtrstatus_token_table[] = {
T1( "r", K_R, GE(8), NO_OBJ ),
T1( "s", K_S, ARGS, NO_OBJ ),
T01("v", K_V, CONCAT_ARGS, NO_OBJ ),
T0N("opt", K_OPT, CONCAT_ARGS, OBJ_OK ),
END_OF_TABLE
};
/** List of tokens allowable in the header part of v2 networkstatus documents.
*/
static token_rule_t netstatus_token_table[] = {
T1( "published", K_PUBLISHED, CONCAT_ARGS, NO_OBJ ),
T0N("opt", K_OPT, CONCAT_ARGS, OBJ_OK ),
T1( "contact", K_CONTACT, CONCAT_ARGS, NO_OBJ ),
T1( "dir-signing-key", K_DIR_SIGNING_KEY, NO_ARGS, NEED_KEY_1024 ),
T1( "fingerprint", K_FINGERPRINT, CONCAT_ARGS, NO_OBJ ),
T1_START("network-status-version", K_NETWORK_STATUS_VERSION,
GE(1), NO_OBJ ),
T1( "dir-source", K_DIR_SOURCE, GE(3), NO_OBJ ),
T01("dir-options", K_DIR_OPTIONS, ARGS, NO_OBJ ),
T01("client-versions", K_CLIENT_VERSIONS, CONCAT_ARGS, NO_OBJ ),
T01("server-versions", K_SERVER_VERSIONS, CONCAT_ARGS, NO_OBJ ),
END_OF_TABLE
};
/** List of tokens allowable in the footer of v1/v2 directory/networkstatus
* footers. */
static token_rule_t dir_footer_token_table[] = {
T1("directory-signature", K_DIRECTORY_SIGNATURE, EQ(1), NEED_OBJ ),
END_OF_TABLE
};
/** List of tokens allowable in v1 diectory headers/footers. */
static token_rule_t dir_token_table[] = {
/* don't enforce counts; this is obsolete. */
T( "network-status", K_NETWORK_STATUS, NO_ARGS, NO_OBJ ),
T( "directory-signature", K_DIRECTORY_SIGNATURE, ARGS, NEED_OBJ ),
T( "recommended-software",K_RECOMMENDED_SOFTWARE,CONCAT_ARGS, NO_OBJ ),
T( "signed-directory", K_SIGNED_DIRECTORY, NO_ARGS, NO_OBJ ),
T( "running-routers", K_RUNNING_ROUTERS, ARGS, NO_OBJ ),
T( "router-status", K_ROUTER_STATUS, ARGS, NO_OBJ ),
T( "published", K_PUBLISHED, CONCAT_ARGS, NO_OBJ ),
T( "opt", K_OPT, CONCAT_ARGS, OBJ_OK ),
T( "contact", K_CONTACT, CONCAT_ARGS, NO_OBJ ),
T( "dir-signing-key", K_DIR_SIGNING_KEY, ARGS, OBJ_OK ),
T( "fingerprint", K_FINGERPRINT, CONCAT_ARGS, NO_OBJ ),
END_OF_TABLE
};
/** List of tokens allowable in the footer of v1/v2 directory/networkstatus
* footers. */
#define CERTIFICATE_MEMBERS \
T1("dir-key-certificate-version", K_DIR_KEY_CERTIFICATE_VERSION, \
GE(1), NO_OBJ ), \
T1("dir-identity-key", K_DIR_IDENTITY_KEY, NO_ARGS, NEED_KEY ),\
T1("dir-key-published",K_DIR_KEY_PUBLISHED, CONCAT_ARGS, NO_OBJ), \
T1("dir-key-expires", K_DIR_KEY_EXPIRES, CONCAT_ARGS, NO_OBJ), \
T1("dir-signing-key", K_DIR_SIGNING_KEY, NO_ARGS, NEED_KEY ),\
T1("dir-key-certification", K_DIR_KEY_CERTIFICATION, \
NO_ARGS, NEED_OBJ),
static token_rule_t dir_key_certificate_table[] = {
CERTIFICATE_MEMBERS
T1("fingerprint", K_FINGERPRINT, CONCAT_ARGS, NO_OBJ ),
END_OF_TABLE
};
static token_rule_t networkstatus_vote_token_table[] = {
T1("network-status-version", K_NETWORK_STATUS_VERSION,
GE(1), NO_OBJ ),
T1("vote-status", K_VOTE_STATUS, GE(1), NO_OBJ ),
T1("published", K_PUBLISHED, CONCAT_ARGS, NO_OBJ ),
T1("valid-after", K_VALID_AFTER, CONCAT_ARGS, NO_OBJ ),
T1("fresh-until", K_FRESH_UNTIL, CONCAT_ARGS, NO_OBJ ),
T1("valid-until", K_VALID_UNTIL, CONCAT_ARGS, NO_OBJ ),
T1("voting-delay", K_VOTING_DELAY, GE(2), NO_OBJ ),
T1("known-flags", K_KNOWN_FLAGS, CONCAT_ARGS, NO_OBJ ),
T( "fingerprint", K_FINGERPRINT, CONCAT_ARGS, NO_OBJ ),
CERTIFICATE_MEMBERS
T0N("opt", K_OPT, CONCAT_ARGS, OBJ_OK ),
T1( "contact", K_CONTACT, CONCAT_ARGS, NO_OBJ ),
T1( "dir-source", K_DIR_SOURCE, GE(6), NO_OBJ ),
T1( "dir-options", K_DIR_OPTIONS, ARGS, NO_OBJ ),
T1( "known-flags", K_KNOWN_FLAGS, CONCAT_ARGS, NO_OBJ ),
T01("client-versions", K_CLIENT_VERSIONS, CONCAT_ARGS, NO_OBJ ),
T01("server-versions", K_SERVER_VERSIONS, CONCAT_ARGS, NO_OBJ ),
END_OF_TABLE
};
static token_rule_t networkstatus_consensus_token_table[] = {
T1("network-status-version", K_NETWORK_STATUS_VERSION,
GE(1), NO_OBJ ),
T1("vote-status", K_VOTE_STATUS, GE(1), NO_OBJ ),
T1("valid-after", K_VALID_AFTER, CONCAT_ARGS, NO_OBJ ),
T1("fresh-until", K_FRESH_UNTIL, CONCAT_ARGS, NO_OBJ ),
T1("valid-until", K_VALID_UNTIL, CONCAT_ARGS, NO_OBJ ),
T1("voting-delay", K_VOTING_DELAY, GE(2), NO_OBJ ),
T0N("opt", K_OPT, CONCAT_ARGS, OBJ_OK ),
T1N("dir-source", K_DIR_SOURCE, GE(3), NO_OBJ ),
T1N("contact", K_CONTACT, CONCAT_ARGS, NO_OBJ ),
T1N("vote-digest", K_VOTE_DIGEST, GE(1), NO_OBJ ),
T1( "known-flags", K_KNOWN_FLAGS, CONCAT_ARGS, NO_OBJ ),
T01("client-versions", K_CLIENT_VERSIONS, CONCAT_ARGS, NO_OBJ ),
T01("server-versions", K_SERVER_VERSIONS, CONCAT_ARGS, NO_OBJ ),
END_OF_TABLE
};
static token_rule_t networkstatus_vote_footer_token_table[] = {
T( "directory-signature", K_DIRECTORY_SIGNATURE, GE(2), NEED_OBJ ),
END_OF_TABLE
};
#undef T
/* static function prototypes */
static int router_add_exit_policy(routerinfo_t *router,directory_token_t *tok);
static addr_policy_t *router_parse_addr_policy(directory_token_t *tok);
static addr_policy_t *router_parse_addr_policy_private(directory_token_t *tok);
static int router_get_hash_impl(const char *s, char *digest,
const char *start_str, const char *end_str,
char end_char);
static void token_free(directory_token_t *tok);
static smartlist_t *find_all_exitpolicy(smartlist_t *s);
static directory_token_t *find_first_by_keyword(smartlist_t *s,
directory_keyword keyword);
static int tokenize_string(const char *start, const char *end,
smartlist_t *out,
token_rule_t *table);
static directory_token_t *get_next_token(const char **s,
token_rule_t *table);
static int check_signature_token(const char *digest,
directory_token_t *tok,
crypto_pk_env_t *pkey,
int check_authority,
const char *doctype);
static crypto_pk_env_t *find_dir_signing_key(const char *str);
static int tor_version_same_series(tor_version_t *a, tor_version_t *b);
/** Set digest to the SHA-1 digest of the hash of the directory in
* s. Return 0 on success, -1 on failure.
*/
int
router_get_dir_hash(const char *s, char *digest)
{
return router_get_hash_impl(s,digest,
"signed-directory","\ndirectory-signature",'\n');
}
/** Set digest to the SHA-1 digest of the hash of the first router in
* s. Return 0 on success, -1 on failure.
*/
int
router_get_router_hash(const char *s, char *digest)
{
return router_get_hash_impl(s,digest,
"router ","\nrouter-signature", '\n');
}
/** Set digest to the SHA-1 digest of the hash of the running-routers
* string in s. Return 0 on success, -1 on failure.
*/
int
router_get_runningrouters_hash(const char *s, char *digest)
{
return router_get_hash_impl(s,digest,
"network-status","\ndirectory-signature", '\n');
}
/** Set digest to the SHA-1 digest of the hash of the network-status
* string in s. Return 0 on success, -1 on failure. */
int
router_get_networkstatus_v2_hash(const char *s, char *digest)
{
return router_get_hash_impl(s,digest,
"network-status-version","\ndirectory-signature",
'\n');
}
/** Set digest to the SHA-1 digest of the hash of the network-status
* string in s. Return 0 on success, -1 on failure. */
int
router_get_networkstatus_v3_hash(const char *s, char *digest)
{
return router_get_hash_impl(s,digest,
"network-status-version","\ndirectory-signature",
' ');
}
/** Set digest to the SHA-1 digest of the hash of the extrainfo
* string in s. Return 0 on success, -1 on failure. */
int
router_get_extrainfo_hash(const char *s, char *digest)
{
return router_get_hash_impl(s,digest,"extra-info","\nrouter-signature",'\n');
}
/** Helper: used to generate signatures for routers, directories and
* network-status objects. Given a digest in digest and a secret
* private_key, generate an PKCS1-padded signature, BASE64-encode it,
* surround it with -----BEGIN/END----- pairs, and write it to the
* buf_len-byte buffer at buf. Return 0 on success, -1 on
* failure.
*/
int
router_append_dirobj_signature(char *buf, size_t buf_len, const char *digest,
crypto_pk_env_t *private_key)
{
char *signature;
int i;
signature = tor_malloc(crypto_pk_keysize(private_key));
if (crypto_pk_private_sign(private_key, signature, digest, DIGEST_LEN) < 0) {
log_warn(LD_BUG,"Couldn't sign digest.");
goto err;
}
if (strlcat(buf, "-----BEGIN SIGNATURE-----\n", buf_len) >= buf_len)
goto truncated;
i = strlen(buf);
if (base64_encode(buf+i, buf_len-i, signature, 128) < 0) {
log_warn(LD_BUG,"couldn't base64-encode signature");
tor_free(buf);
goto err;
}
if (strlcat(buf, "-----END SIGNATURE-----\n", buf_len) >= buf_len)
goto truncated;
tor_free(signature);
return 0;
truncated:
log_warn(LD_BUG,"tried to exceed string length.");
err:
tor_free(signature);
return -1;
}
/** Return VS_RECOMMENDED if myversion is contained in
* versionlist. Else, return VS_OLD if every member of
* versionlist is newer than myversion. Else, return
* VS_NEW_IN_SERIES if there is at least one member of versionlist in
* the same series (major.minor.micro) as myversion, but no such member
* is newer than myversion.. Else, return VS_NEW if every memeber of
* versionlist is older than myversion. Else, return
* VS_UNRECOMMENDED.
*
* (versionlist is a comma-separated list of version strings,
* optionally prefixed with "Tor". Versions that can't be parsed are
* ignored.)
*/
version_status_t
tor_version_is_obsolete(const char *myversion, const char *versionlist)
{
tor_version_t mine, other;
int found_newer = 0, found_older = 0, found_newer_in_series = 0,
found_any_in_series = 0, r, same;
version_status_t ret = VS_UNRECOMMENDED;
smartlist_t *version_sl;
log_debug(LD_CONFIG,"Checking whether version '%s' is in '%s'",
myversion, versionlist);
if (tor_version_parse(myversion, &mine)) {
log_err(LD_BUG,"I couldn't parse my own version (%s)", myversion);
tor_assert(0);
}
version_sl = smartlist_create();
smartlist_split_string(version_sl, versionlist, ",", SPLIT_SKIP_SPACE, 0);
SMARTLIST_FOREACH(version_sl, const char *, cp, {
if (!strcmpstart(cp, "Tor "))
cp += 4;
if (tor_version_parse(cp, &other)) {
/* Couldn't parse other; it can't be a match. */
} else {
same = tor_version_same_series(&mine, &other);
if (same)
found_any_in_series = 1;
r = tor_version_compare(&mine, &other);
if (r==0) {
ret = VS_RECOMMENDED;
goto done;
} else if (r<0) {
found_newer = 1;
if (same)
found_newer_in_series = 1;
} else if (r>0) {
found_older = 1;
}
}
});
/* We didn't find the listed version. Is it new or old? */
if (found_any_in_series && !found_newer_in_series && found_newer) {
ret = VS_NEW_IN_SERIES;
} else if (found_newer && !found_older) {
ret = VS_OLD;
} else if (found_older && !found_newer) {
ret = VS_NEW;
} else {
ret = VS_UNRECOMMENDED;
}
done:
SMARTLIST_FOREACH(version_sl, char *, version, tor_free(version));
smartlist_free(version_sl);
return ret;
}
/** Return the combined status of the current version, given that we know of
* one set of networkstatuses that give us status a, and another that
* gives us status b.
*
* For example, if one authority thinks that we're NEW, and another thinks
* we're OLD, we're simply UNRECOMMENDED.
*
* This function does not handle calculating whether we're RECOMMENDED; that
* follows a simple majority rule. This function simply calculates *why*
* we're not recommended (if we're not).
*/
version_status_t
version_status_join(version_status_t a, version_status_t b)
{
if (a == b)
return a;
else if (a == VS_UNRECOMMENDED || b == VS_UNRECOMMENDED)
return VS_UNRECOMMENDED;
else if (a == VS_RECOMMENDED)
return b;
else if (b == VS_RECOMMENDED)
return a;
/* Okay. Neither is 'recommended' or 'unrecommended', and they differ. */
else if (a == VS_OLD || b == VS_OLD)
return VS_UNRECOMMENDED;
/* One is VS_NEW, the other is VS_NEW_IN_SERIES */
else
return VS_NEW_IN_SERIES;
}
/** Read a signed directory from str. If it's well-formed, return 0.
* Otherwise, return -1. If we're a directory cache, cache it.
*/
int
router_parse_directory(const char *str)
{
directory_token_t *tok;
char digest[DIGEST_LEN];
time_t published_on;
int r;
const char *end, *cp;
smartlist_t *tokens = NULL;
crypto_pk_env_t *declared_key = NULL;
/* XXXX This could be simplified a lot, but it will all go away
* once pre-0.1.1.8 is obsolete, and for now it's better not to
* touch it. */
if (router_get_dir_hash(str, digest)) {
log_warn(LD_DIR, "Unable to compute digest of directory");
goto err;
}
log_debug(LD_DIR,"Received directory hashes to %s",hex_str(digest,4));
/* Check signature first, before we try to tokenize. */
cp = str;
while (cp && (end = strstr(cp+1, "\ndirectory-signature")))
cp = end;
if (cp == str || !cp) {
log_warn(LD_DIR, "No signature found on directory."); goto err;
}
++cp;
tokens = smartlist_create();
if (tokenize_string(cp,strchr(cp,'\0'),tokens,dir_token_table)) {
log_warn(LD_DIR, "Error tokenizing directory signature"); goto err;
}
if (smartlist_len(tokens) != 1) {
log_warn(LD_DIR, "Unexpected number of tokens in signature"); goto err;
}
tok=smartlist_get(tokens,0);
if (tok->tp != K_DIRECTORY_SIGNATURE) {
log_warn(LD_DIR,"Expected a single directory signature"); goto err;
}
declared_key = find_dir_signing_key(str);
note_crypto_pk_op(VERIFY_DIR);
if (check_signature_token(digest, tok, declared_key, 1, "directory")<0)
goto err;
SMARTLIST_FOREACH(tokens, directory_token_t *, t, token_free(t));
smartlist_free(tokens);
tokens = NULL;
/* Now try to parse the first part of the directory. */
if ((end = strstr(str,"\nrouter "))) {
++end;
} else if ((end = strstr(str, "\ndirectory-signature"))) {
++end;
} else {
end = str + strlen(str);
}
tokens = smartlist_create();
if (tokenize_string(str,end,tokens,dir_token_table)) {
log_warn(LD_DIR, "Error tokenizing directory"); goto err;
}
tok = find_first_by_keyword(tokens, K_PUBLISHED);
tor_assert(tok);
tor_assert(tok->n_args == 1);
if (parse_iso_time(tok->args[0], &published_on) < 0) {
goto err;
}
/* Now that we know the signature is okay, and we have a
* publication time, cache the directory. */
if (get_options()->DirPort && !authdir_mode_v1(get_options()))
dirserv_set_cached_directory(str, published_on, 0);
r = 0;
goto done;
err:
r = -1;
done:
if (declared_key) crypto_free_pk_env(declared_key);
if (tokens) {
SMARTLIST_FOREACH(tokens, directory_token_t *, t, token_free(t));
smartlist_free(tokens);
}
return r;
}
/** Read a signed router status statement from str. If it's
* well-formed, return 0. Otherwise, return -1. If we're a directory cache,
* cache it.*/
int
router_parse_runningrouters(const char *str)
{
char digest[DIGEST_LEN];
directory_token_t *tok;
time_t published_on;
int r = -1;
crypto_pk_env_t *declared_key = NULL;
smartlist_t *tokens = NULL;
if (router_get_runningrouters_hash(str, digest)) {
log_warn(LD_DIR, "Unable to compute digest of running-routers");
goto err;
}
tokens = smartlist_create();
if (tokenize_string(str,str+strlen(str),tokens,dir_token_table)) {
log_warn(LD_DIR, "Error tokenizing running-routers"); goto err;
}
tok = smartlist_get(tokens,0);
if (tok->tp != K_NETWORK_STATUS) {
log_warn(LD_DIR, "Network-status starts with wrong token");
goto err;
}
tok = find_first_by_keyword(tokens, K_PUBLISHED);
tor_assert(tok);
tor_assert(tok->n_args == 1);
if (parse_iso_time(tok->args[0], &published_on) < 0) {
goto err;
}
if (!(tok = find_first_by_keyword(tokens, K_DIRECTORY_SIGNATURE))) {
log_warn(LD_DIR, "Missing signature on running-routers");
goto err;
}
declared_key = find_dir_signing_key(str);
note_crypto_pk_op(VERIFY_DIR);
if (check_signature_token(digest, tok, declared_key, 1, "running-routers")
< 0)
goto err;
/* Now that we know the signature is okay, and we have a
* publication time, cache the list. */
if (get_options()->DirPort && !authdir_mode_v1(get_options()))
dirserv_set_cached_directory(str, published_on, 1);
r = 0;
err:
if (declared_key) crypto_free_pk_env(declared_key);
if (tokens) {
SMARTLIST_FOREACH(tokens, directory_token_t *, t, token_free(t));
smartlist_free(tokens);
}
return r;
}
/** Given a directory or running-routers string in str, try to
* find the its dir-signing-key token (if any). If this token is
* present, extract and return the key. Return NULL on failure. */
static crypto_pk_env_t *
find_dir_signing_key(const char *str)
{
const char *cp;
directory_token_t *tok;
crypto_pk_env_t *key = NULL;
/* Is there a dir-signing-key in the directory? */
cp = strstr(str, "\nopt dir-signing-key");
if (!cp)
cp = strstr(str, "\ndir-signing-key");
if (!cp)
return NULL;
++cp; /* Now cp points to the start of the token. */
tok = get_next_token(&cp, dir_token_table);
if (!tok) {
log_warn(LD_DIR, "Unparseable dir-signing-key token");
return NULL;
}
if (tok->tp != K_DIR_SIGNING_KEY) {
log_warn(LD_DIR, "Dir-signing-key token did not parse as expected");
return NULL;
}
if (tok->key) {
key = tok->key;
tok->key = NULL; /* steal reference. */
} else {
log_warn(LD_DIR, "Dir-signing-key token contained no key");
return NULL;
}
token_free(tok);
return key;
}
/** Return true iff key is allowed to sign directories.
*/
static int
dir_signing_key_is_trusted(crypto_pk_env_t *key)
{
char digest[DIGEST_LEN];
if (!key) return 0;
if (crypto_pk_get_digest(key, digest) < 0) {
log_warn(LD_DIR, "Error computing dir-signing-key digest");
return 0;
}
if (!router_digest_is_trusted_dir(digest)) {
log_warn(LD_DIR, "Listed dir-signing-key is not trusted");
return 0;
}
return 1;
}
/** Check whether the object body of the token in tok has a good
* signature for digest using key pkey. If
* check_authority is set, make sure that pkey is the key of a
* directory authority. Use doctype as the type of the document when
* generating log messages. Return 0 on success, negative on failure.
*/
static int
check_signature_token(const char *digest,
directory_token_t *tok,
crypto_pk_env_t *pkey,
int check_authority,
const char *doctype)
{
char *signed_digest;
tor_assert(pkey);
tor_assert(tok);
tor_assert(digest);
tor_assert(doctype);
if (check_authority && !dir_signing_key_is_trusted(pkey)) {
log_warn(LD_DIR, "Key on %s did not come from an authority; rejecting",
doctype);
return -1;
}
if (strcmp(tok->object_type, "SIGNATURE")) {
log_warn(LD_DIR, "Bad object type on %s signature", doctype);
return -1;
}
signed_digest = tor_malloc(tok->object_size);
if (crypto_pk_public_checksig(pkey, signed_digest, tok->object_body,
tok->object_size)
!= DIGEST_LEN) {
log_warn(LD_DIR, "Error reading %s: invalid signature.", doctype);
tor_free(signed_digest);
return -1;
}
log_debug(LD_DIR,"Signed %s hash starts %s", doctype,
hex_str(signed_digest,4));
if (memcmp(digest, signed_digest, DIGEST_LEN)) {
log_warn(LD_DIR, "Error reading %s: signature does not match.", doctype);
tor_free(signed_digest);
return -1;
}
tor_free(signed_digest);
return 0;
}
/** Given a string *s containing a concatenated sequence of router
* descriptors (or extra-info documents if is_extrainfo is set), parses
* them and stores the result in dest. All routers are marked running
* and valid. Advances *s to a point immediately following the last router
* entry. Ignore any trailing router entries that are not complete.
*
* If saved_location isn't SAVED_IN_CACHE, make a local copy of each
* descriptor in the signed_descriptor_body field of each routerinfo_t. If it
* isn't SAVED_NOWHERE, remember the offset of each descriptor.
*
* Returns 0 on success and -1 on failure.
*/
int
router_parse_list_from_string(const char **s, const char *eos,
smartlist_t *dest,
saved_location_t saved_location,
int want_extrainfo)
{
routerinfo_t *router;
extrainfo_t *extrainfo;
signed_descriptor_t *signed_desc;
void *elt;
const char *end, *start;
int have_extrainfo;
tor_assert(s);
tor_assert(*s);
tor_assert(dest);
start = *s;
if (!eos)
eos = *s + strlen(*s);
tor_assert(eos >= *s);
while (1) {
*s = eat_whitespace_eos(*s, eos);
if ((eos - *s) < 32) /* make sure it's long enough. */
break;
/* Don't start parsing the rest of *s unless it contains a router. */
if (strcmpstart(*s, "extra-info ")==0) {
have_extrainfo = 1;
} else if (strcmpstart(*s, "router ")==0) {
have_extrainfo = 0;
} else {
/* skip junk. */
const char *ei = tor_memstr(*s, eos-*s, "\nextra-info ");
const char *ri = tor_memstr(*s, eos-*s, "\nrouter ");
if (ri && (!ei || ri < ei)) {
have_extrainfo = 0;
*s = ri + 1;
} else if (ei) {
have_extrainfo = 1;
*s = ei + 1;
} else {
break;
}
}
end = tor_memstr(*s, eos-*s, "\nrouter-signature");
if (end)
end = tor_memstr(end, eos-*s, "\n-----END SIGNATURE-----\n");
if (end)
end += strlen("\n-----END SIGNATURE-----\n");
if (!end)
break;
elt = NULL;
if (have_extrainfo && want_extrainfo) {
routerlist_t *rl = router_get_routerlist();
/* XXXX020 fix this cast to digestmap_t* */
extrainfo = extrainfo_parse_entry_from_string(*s, end,
saved_location != SAVED_IN_CACHE,
(digestmap_t*)rl->identity_map);
if (extrainfo) {
signed_desc = &extrainfo->cache_info;
elt = extrainfo;
}
} else if (!have_extrainfo && !want_extrainfo) {
router = router_parse_entry_from_string(*s, end,
saved_location != SAVED_IN_CACHE);
if (router) {
signed_desc = &router->cache_info;
elt = router;
}
}
if (!elt) {
*s = end;
continue;
}
if (saved_location != SAVED_NOWHERE) {
signed_desc->saved_location = saved_location;
signed_desc->saved_offset = *s - start;
}
*s = end;
smartlist_add(dest, elt);
}
return 0;
}
/* For debugging: define to count every descriptor digest we've seen so we
* know if we need to try harder to avoid duplicate verifies. */
#undef COUNT_DISTINCT_DIGESTS
#ifdef COUNT_DISTINCT_DIGESTS
static digestmap_t *verified_digests = NULL;
#endif
/** Log the total count of the number of distinct router digests we've ever
* verified. When compared to the number of times we've verified routerdesc
* signatures in toto, this will tell us if we're doing too much
* multiple-verification. */
void
dump_distinct_digest_count(int severity)
{
#ifdef COUNT_DISTINCT_DIGESTS
if (!verified_digests)
verified_digests = digestmap_new();
log(severity, LD_GENERAL, "%d *distinct* router digests verified",
digestmap_size(verified_digests));
#else
(void)severity; /* suppress "unused parameter" warning */
#endif
}
/** Helper function: reads a single router entry from *s ...
* *end. Mallocs a new router and returns it if all goes well, else
* returns NULL. If cache_copy is true, duplicate the contents of
* s through end into the signed_descriptor_body of the resulting
* routerinfo_t.
*/
routerinfo_t *
router_parse_entry_from_string(const char *s, const char *end,
int cache_copy)
{
routerinfo_t *router = NULL;
char digest[128];
smartlist_t *tokens = NULL, *exit_policy_tokens = NULL;
directory_token_t *tok;
struct in_addr in;
if (!end) {
end = s + strlen(s);
}
/* point 'end' to a point immediately after the final newline. */
while (end > s+2 && *(end-1) == '\n' && *(end-2) == '\n')
--end;
if (router_get_router_hash(s, digest) < 0) {
log_warn(LD_DIR, "Couldn't compute router hash.");
return NULL;
}
tokens = smartlist_create();
if (tokenize_string(s,end,tokens,routerdesc_token_table)) {
log_warn(LD_DIR, "Error tokenizing router descriptor.");
goto err;
}
if (smartlist_len(tokens) < 2) {
log_warn(LD_DIR, "Impossibly short router descriptor.");
goto err;
}
tok = smartlist_get(tokens,0);
if (tok->tp != K_ROUTER) {
log_warn(LD_DIR,"Entry does not start with \"router\"");
goto err;
}
tor_assert(tok->n_args >= 5);
router = tor_malloc_zero(sizeof(routerinfo_t));
router->routerlist_index = -1;
if (cache_copy)
router->cache_info.signed_descriptor_body = tor_strndup(s, end-s);
router->cache_info.signed_descriptor_len = end-s;
memcpy(router->cache_info.signed_descriptor_digest, digest, DIGEST_LEN);
router->nickname = tor_strdup(tok->args[0]);
if (!is_legal_nickname(router->nickname)) {
log_warn(LD_DIR,"Router nickname is invalid");
goto err;
}
router->address = tor_strdup(tok->args[1]);
if (!tor_inet_aton(router->address, &in)) {
log_warn(LD_DIR,"Router address is not an IP.");
goto err;
}
router->addr = ntohl(in.s_addr);
router->or_port =
(uint16_t) tor_parse_long(tok->args[2],10,0,65535,NULL,NULL);
router->dir_port =
(uint16_t) tor_parse_long(tok->args[4],10,0,65535,NULL,NULL);
tok = find_first_by_keyword(tokens, K_BANDWIDTH);
tor_assert(tok && tok->n_args >= 3);
router->bandwidthrate =
tor_parse_long(tok->args[0],10,0,INT_MAX,NULL,NULL);
if (!router->bandwidthrate) {
log_warn(LD_DIR, "bandwidthrate %s unreadable or 0. Failing.",
escaped(tok->args[0]));
goto err;
}
router->bandwidthburst =
tor_parse_long(tok->args[1],10,0,INT_MAX,NULL,NULL);
router->bandwidthcapacity =
tor_parse_long(tok->args[2],10,0,INT_MAX,NULL,NULL);
/* XXXX020 we don't error-check these values? -RD */
if ((tok = find_first_by_keyword(tokens, K_UPTIME))) {
tor_assert(tok->n_args >= 1);
router->uptime = tor_parse_long(tok->args[0],10,0,LONG_MAX,NULL,NULL);
}
if ((tok = find_first_by_keyword(tokens, K_HIBERNATING))) {
tor_assert(tok->n_args >= 1);
router->is_hibernating
= (tor_parse_long(tok->args[0],10,0,LONG_MAX,NULL,NULL) != 0);
}
tok = find_first_by_keyword(tokens, K_PUBLISHED);
tor_assert(tok);
tor_assert(tok->n_args == 1);
if (parse_iso_time(tok->args[0], &router->cache_info.published_on) < 0)
goto err;
tok = find_first_by_keyword(tokens, K_ONION_KEY);
tor_assert(tok);
router->onion_pkey = tok->key;
tok->key = NULL; /* Prevent free */
tok = find_first_by_keyword(tokens, K_SIGNING_KEY);
tor_assert(tok);
router->identity_pkey = tok->key;
tok->key = NULL; /* Prevent free */
if (crypto_pk_get_digest(router->identity_pkey,
router->cache_info.identity_digest)) {
log_warn(LD_DIR, "Couldn't calculate key digest"); goto err;
}
if ((tok = find_first_by_keyword(tokens, K_FINGERPRINT))) {
/* If there's a fingerprint line, it must match the identity digest. */
char d[DIGEST_LEN];
tor_assert(tok->n_args == 1);
tor_strstrip(tok->args[0], " ");
if (base16_decode(d, DIGEST_LEN, tok->args[0], strlen(tok->args[0]))) {
log_warn(LD_DIR, "Couldn't decode router fingerprint %s",
escaped(tok->args[0]));
goto err;
}
if (memcmp(d,router->cache_info.identity_digest, DIGEST_LEN)!=0) {
log_warn(LD_DIR, "Fingerprint '%s' does not match identity digest.",
tok->args[0]);
goto err;
}
}
if ((tok = find_first_by_keyword(tokens, K_PLATFORM))) {
router->platform = tor_strdup(tok->args[0]);
}
if ((tok = find_first_by_keyword(tokens, K_CONTACT))) {
router->contact_info = tor_strdup(tok->args[0]);
}
if ((tok = find_first_by_keyword(tokens, K_EVENTDNS))) {
router->has_old_dnsworkers = tok->n_args && !strcmp(tok->args[0], "0");
} else if (router->platform) {
if (! tor_version_as_new_as(router->platform, "0.1.2.2-alpha"))
router->has_old_dnsworkers = 1;
}
exit_policy_tokens = find_all_exitpolicy(tokens);
SMARTLIST_FOREACH(exit_policy_tokens, directory_token_t *, t,
if (router_add_exit_policy(router,t)<0) {
log_warn(LD_DIR,"Error in exit policy");
goto err;
});
if ((tok = find_first_by_keyword(tokens, K_FAMILY)) && tok->n_args) {
int i;
router->declared_family = smartlist_create();
for (i=0;in_args;++i) {
if (!is_legal_nickname_or_hexdigest(tok->args[i])) {
log_warn(LD_DIR, "Illegal nickname %s in family line",
escaped(tok->args[i]));
goto err;
}
smartlist_add(router->declared_family, tor_strdup(tok->args[i]));
}
}
if ((tok = find_first_by_keyword(tokens, K_CACHES_EXTRA_INFO)))
router->caches_extra_info = 1;
if ((tok = find_first_by_keyword(tokens, K_EXTRA_INFO_DIGEST))) {
tor_assert(tok->n_args >= 1);
if (strlen(tok->args[0]) == HEX_DIGEST_LEN) {
base16_decode(router->cache_info.extra_info_digest,
DIGEST_LEN, tok->args[0], HEX_DIGEST_LEN);
} else {
log_warn(LD_DIR, "Invalid extra info digest %s", escaped(tok->args[0]));
}
}
tok = find_first_by_keyword(tokens, K_ROUTER_SIGNATURE);
tor_assert(tok);
note_crypto_pk_op(VERIFY_RTR);
#ifdef COUNT_DISTINCT_DIGESTS
if (!verified_digests)
verified_digests = digestmap_new();
digestmap_set(verified_digests, signed_digest, (void*)(uintptr_t)1);
#endif
if (check_signature_token(digest, tok, router->identity_pkey, 0,
"router descriptor") < 0)
goto err;
if (!router->or_port) {
log_warn(LD_DIR,"or_port unreadable or 0. Failing.");
goto err;
}
if (!router->platform) {
router->platform = tor_strdup("");
}
goto done;
err:
routerinfo_free(router);
router = NULL;
done:
if (tokens) {
SMARTLIST_FOREACH(tokens, directory_token_t *, t, token_free(t));
smartlist_free(tokens);
}
if (exit_policy_tokens) {
smartlist_free(exit_policy_tokens);
}
return router;
}
/** Parse a single extrainfo entry from the string s, ending at
* end. (If end is NULL, parse up to the end of s.) If
* cache_copy is true, make a copy of the extra-info document in the
* cache_info fields of the result. If routermap is provided, use it
* as a map from router identity to routerinfo_t when looking up signing keys.
*/
extrainfo_t *
extrainfo_parse_entry_from_string(const char *s, const char *end,
int cache_copy, digestmap_t *routermap)
{
extrainfo_t *extrainfo = NULL;
char digest[128];
smartlist_t *tokens = NULL;
directory_token_t *tok;
crypto_pk_env_t *key = NULL;
routerinfo_t *router;
if (!end) {
end = s + strlen(s);
}
/* point 'end' to a point immediately after the final newline. */
while (end > s+2 && *(end-1) == '\n' && *(end-2) == '\n')
--end;
if (router_get_extrainfo_hash(s, digest) < 0) {
log_warn(LD_DIR, "Couldn't compute router hash.");
return NULL;
}
tokens = smartlist_create();
if (tokenize_string(s,end,tokens,extrainfo_token_table)) {
log_warn(LD_DIR, "Error tokenizing router descriptor.");
goto err;
}
if (smartlist_len(tokens) < 2) {
log_warn(LD_DIR, "Impossibly short router descriptor.");
goto err;
}
tok = smartlist_get(tokens,0);
if (tok->tp != K_EXTRA_INFO) {
log_warn(LD_DIR,"Entry does not start with \"extra-info\"");
goto err;
}
extrainfo = tor_malloc_zero(sizeof(extrainfo_t));
extrainfo->cache_info.is_extrainfo = 1;
if (cache_copy)
extrainfo->cache_info.signed_descriptor_body = tor_strndup(s, end-s);
extrainfo->cache_info.signed_descriptor_len = end-s;
memcpy(extrainfo->cache_info.signed_descriptor_digest, digest, DIGEST_LEN);
tor_assert(tok->n_args >= 2);
if (!is_legal_nickname(tok->args[0])) {
log_warn(LD_DIR,"Bad nickname %s on \"extra-info\"",escaped(tok->args[0]));
goto err;
}
strlcpy(extrainfo->nickname, tok->args[0], sizeof(extrainfo->nickname));
if (strlen(tok->args[1]) != HEX_DIGEST_LEN ||
base16_decode(extrainfo->cache_info.identity_digest, DIGEST_LEN,
tok->args[1], HEX_DIGEST_LEN)) {
log_warn(LD_DIR,"Invalid fingerprint %s on \"extra-info\"",
escaped(tok->args[1]));
goto err;
}
tok = find_first_by_keyword(tokens, K_PUBLISHED);
tor_assert(tok);
if (parse_iso_time(tok->args[0], &extrainfo->cache_info.published_on)) {
log_warn(LD_DIR,"Invalid published time %s on \"extra-info\"",
escaped(tok->args[0]));
goto err;
}
if (routermap &&
(router = digestmap_get(routermap,
extrainfo->cache_info.identity_digest))) {
key = router->identity_pkey;
}
tok = find_first_by_keyword(tokens, K_ROUTER_SIGNATURE);
tor_assert(tok);
if (strcmp(tok->object_type, "SIGNATURE") ||
tok->object_size < 128 || tok->object_size > 512) {
log_warn(LD_DIR, "Bad object type or length on extra-info signature");
goto err;
}
if (key) {
note_crypto_pk_op(VERIFY_RTR);
if (check_signature_token(digest, tok, key, 0, "extra-info") < 0)
goto err;
} else {
extrainfo->pending_sig = tor_memdup(tok->object_body,
tok->object_size);
extrainfo->pending_sig_len = tok->object_size;
}
goto done;
err:
if (extrainfo)
extrainfo_free(extrainfo);
extrainfo = NULL;
done:
if (tokens) {
SMARTLIST_FOREACH(tokens, directory_token_t *, t, token_free(t));
smartlist_free(tokens);
}
return extrainfo;
}
/** Parse a key certificate from s; point end-of-string to
* the first character after the certificate. */
authority_cert_t *
authority_cert_parse_from_string(const char *s, const char **end_of_string)
{
authority_cert_t *cert = NULL;
smartlist_t *tokens = NULL;
char digest[DIGEST_LEN];
directory_token_t *tok;
char fp_declared[DIGEST_LEN];
char *eos;
size_t len;
trusted_dir_server_t *ds;
s = eat_whitespace(s);
eos = strstr(s, "\n-----END SIGNATURE-----\n");
if (! eos) {
log_warn(LD_DIR, "No end-of-signature found on key certificate");
return NULL;
}
eos = strchr(eos+2, '\n');
tor_assert(eos);
++eos;
len = eos - s;
tokens = smartlist_create();
if (tokenize_string(s, eos, tokens, dir_key_certificate_table) < 0) {
log_warn(LD_DIR, "Error tokenizing key certificate");
goto err;
}
if (router_get_hash_impl(s, digest, "dir-key-certificate-version",
"\ndir-key-certification", '\n') < 0)
goto err;
tok = smartlist_get(tokens, 0);
if (tok->tp != K_DIR_KEY_CERTIFICATE_VERSION || strcmp(tok->args[0], "3")) {
log_warn(LD_DIR,
"Key certificate does not begin with a recognized version (3).");
goto err;
}
cert = tor_malloc_zero(sizeof(authority_cert_t));
memcpy(cert->cache_info.signed_descriptor_digest, digest, DIGEST_LEN);
tok = find_first_by_keyword(tokens, K_DIR_SIGNING_KEY);
tor_assert(tok && tok->key);
cert->signing_key = tok->key;
tok->key = NULL;
tok = find_first_by_keyword(tokens, K_DIR_IDENTITY_KEY);
tor_assert(tok && tok->key);
cert->identity_key = tok->key;
tok->key = NULL;
tok = find_first_by_keyword(tokens, K_FINGERPRINT);
tor_assert(tok && tok->n_args);
if (base16_decode(fp_declared, DIGEST_LEN, tok->args[0],
strlen(tok->args[0]))) {
log_warn(LD_DIR, "Couldn't decode key certificate fingerprint %s",
escaped(tok->args[0]));
goto err;
}
if (crypto_pk_get_digest(cert->identity_key,
cert->cache_info.identity_digest))
goto err;
if (memcmp(cert->cache_info.identity_digest, fp_declared, DIGEST_LEN)) {
log_warn(LD_DIR, "Digest of certificate key didn't match declared "
"fingerprint");
goto err;
}
tok = find_first_by_keyword(tokens, K_DIR_KEY_PUBLISHED);
tor_assert(tok);
if (parse_iso_time(tok->args[0], &cert->cache_info.published_on) < 0) {
goto err;
}
tok = find_first_by_keyword(tokens, K_DIR_KEY_EXPIRES);
tor_assert(tok);
if (parse_iso_time(tok->args[0], &cert->expires) < 0) {
goto err;
}
tok = smartlist_get(tokens, smartlist_len(tokens)-1);
if (tok->tp != K_DIR_KEY_CERTIFICATION) {
log_warn(LD_DIR, "Certificate didn't end with dir-key-certification.");
goto err;
}
/* If we already have this cert, don't bother checking the signature. */
ds = trusteddirserver_get_by_v3_auth_digest(
cert->cache_info.identity_digest);
if (ds && ds->v3_cert &&
ds->v3_cert->cache_info.signed_descriptor_len == len &&
ds->v3_cert->cache_info.signed_descriptor_body &&
! memcmp(s, ds->v3_cert->cache_info.signed_descriptor_body, len)) {
log_debug(LD_DIR, "We already checked the signature on this certificate;"
" no need to do so again.");
} else {
if (check_signature_token(digest, tok, cert->identity_key, 0,
"key certificate")) {
goto err;
}
}
cert->cache_info.signed_descriptor_len = len;
cert->cache_info.signed_descriptor_body = tor_malloc(len+1);
memcpy(cert->cache_info.signed_descriptor_body, s, len);
cert->cache_info.signed_descriptor_body[len] = 0;
cert->cache_info.saved_location = SAVED_NOWHERE;
if (end_of_string) {
*end_of_string = eat_whitespace(eos);
}
return cert;
err:
authority_cert_free(cert);
return NULL;
}
/** Helper: given a string s, return the start of the next router-status
* object (starting with "r " at the start of a line). If none is found,
* return the start of the next directory signature. If none is found, return
* the end of the string. */
static INLINE const char *
find_start_of_next_routerstatus(const char *s)
{
const char *eos = strstr(s, "\nr ");
if (!eos)
eos = strstr(s, "\ndirectory-signature");
if (eos)
return eos+1;
else
return s + strlen(s);
}
/** Given a string at *s, containing a routerstatus object, and an
* empty smartlist at tokens, parse and return the first router status
* object in the string, and advance *s to just after the end of the
* router status. Return NULL and advance *s on error. */
static routerstatus_t *
routerstatus_parse_entry_from_string(const char **s, smartlist_t *tokens,
networkstatus_vote_t *vote,
vote_routerstatus_t *vote_rs)
{
const char *eos;
routerstatus_t *rs = NULL;
directory_token_t *tok;
char timebuf[ISO_TIME_LEN+1];
struct in_addr in;
tor_assert(tokens);
tor_assert(bool_eq(vote, vote_rs));
eos = find_start_of_next_routerstatus(*s);
if (tokenize_string(*s, eos, tokens, rtrstatus_token_table)) {
log_warn(LD_DIR, "Error tokenizing router status");
goto err;
}
if (smartlist_len(tokens) < 1) {
log_warn(LD_DIR, "Impossibly short router status");
goto err;
}
tok = find_first_by_keyword(tokens, K_R);
tor_assert(tok);
tor_assert(tok->n_args >= 8);
if (vote_rs) {
rs = &vote_rs->status;
} else {
rs = tor_malloc_zero(sizeof(routerstatus_t));
}
if (!is_legal_nickname(tok->args[0])) {
log_warn(LD_DIR,
"Invalid nickname %s in router status; skipping.",
escaped(tok->args[0]));
goto err;
}
strlcpy(rs->nickname, tok->args[0], sizeof(rs->nickname));
if (digest_from_base64(rs->identity_digest, tok->args[1])) {
log_warn(LD_DIR, "Error decoding identity digest %s",
escaped(tok->args[1]));
goto err;
}
if (digest_from_base64(rs->descriptor_digest, tok->args[2])) {
log_warn(LD_DIR, "Error decoding descriptor digest %s",
escaped(tok->args[2]));
goto err;
}
if (tor_snprintf(timebuf, sizeof(timebuf), "%s %s",
tok->args[3], tok->args[4]) < 0 ||
parse_iso_time(timebuf, &rs->published_on)<0) {
log_warn(LD_DIR, "Error parsing time '%s %s'",
tok->args[3], tok->args[4]);
goto err;
}
if (tor_inet_aton(tok->args[5], &in) == 0) {
log_warn(LD_DIR, "Error parsing router address in network-status %s",
escaped(tok->args[5]));
goto err;
}
rs->addr = ntohl(in.s_addr);
rs->or_port =(uint16_t) tor_parse_long(tok->args[6],10,0,65535,NULL,NULL);
rs->dir_port = (uint16_t) tor_parse_long(tok->args[7],10,0,65535,NULL,NULL);
tok = find_first_by_keyword(tokens, K_S);
if (tok && vote) {
int i;
vote_rs->flags = 0;
for (i=0; i < tok->n_args; ++i) {
int p = smartlist_string_pos(vote->known_flags, tok->args[i]);
if (p >= 0) {
vote_rs->flags |= (1<args[i]));
goto err;
}
}
} else if (tok) {
int i;
for (i=0; i < tok->n_args; ++i) {
if (!strcmp(tok->args[i], "Exit"))
rs->is_exit = 1;
else if (!strcmp(tok->args[i], "Stable"))
rs->is_stable = 1;
else if (!strcmp(tok->args[i], "Fast"))
rs->is_fast = 1;
else if (!strcmp(tok->args[i], "Running"))
rs->is_running = 1;
else if (!strcmp(tok->args[i], "Named"))
rs->is_named = 1;
else if (!strcmp(tok->args[i], "Valid"))
rs->is_valid = 1;
else if (!strcmp(tok->args[i], "V2Dir"))
rs->is_v2_dir = 1;
else if (!strcmp(tok->args[i], "Guard"))
rs->is_possible_guard = 1;
else if (!strcmp(tok->args[i], "BadExit"))
rs->is_bad_exit = 1;
else if (!strcmp(tok->args[i], "BadDirectory"))
rs->is_bad_directory = 1;
}
}
if ((tok = find_first_by_keyword(tokens, K_V))) {
tor_assert(tok->n_args == 1);
rs->version_known = 1;
if (strcmpstart(tok->args[0], "Tor ")) {
rs->version_supports_begindir = 1;
rs->version_supports_extrainfo_upload = 1;
} else {
rs->version_supports_begindir =
tor_version_as_new_as(tok->args[0], "0.1.2.2-alpha");
rs->version_supports_begindir =
tor_version_as_new_as(tok->args[0], "0.2.0.0-alpha-dev (r10070)");
}
if (vote_rs) {
vote_rs->version = tok->args[0];
tok->args[0] = NULL; /* suppress free() */
}
}
if (!strcasecmp(rs->nickname, UNNAMED_ROUTER_NICKNAME))
rs->is_named = 0;
goto done;
err:
if (rs && !vote_rs)
routerstatus_free(rs);
rs = NULL;
done:
SMARTLIST_FOREACH(tokens, directory_token_t *, t, token_free(t));
smartlist_clear(tokens);
*s = eos;
return rs;
}
/** Helper to sort a smartlist of pointers to routerstatus_t */
static int
_compare_routerstatus_entries(const void **_a, const void **_b)
{
const routerstatus_t *a = *_a, *b = *_b;
return memcmp(a->identity_digest, b->identity_digest, DIGEST_LEN);
}
/** Helper: used in call to _smartlist_uniq to clear out duplicate entries. */
static void
_free_duplicate_routerstatus_entry(void *e)
{
log_warn(LD_DIR,
"Network-status has two entries for the same router. "
"Dropping one.");
routerstatus_free(e);
}
/** Given a v2 network-status object in s, try to
* parse it and return the result. Return NULL on failure. Check the
* signature of the network status, but do not (yet) check the signing key for
* authority.
*/
networkstatus_t *
networkstatus_parse_from_string(const char *s)
{
const char *eos;
smartlist_t *tokens = smartlist_create();
smartlist_t *footer_tokens = smartlist_create();
networkstatus_t *ns = NULL;
char ns_digest[DIGEST_LEN];
char tmp_digest[DIGEST_LEN];
struct in_addr in;
directory_token_t *tok;
int i;
if (router_get_networkstatus_v2_hash(s, ns_digest)) {
log_warn(LD_DIR, "Unable to compute digest of network-status");
goto err;
}
eos = find_start_of_next_routerstatus(s);
if (tokenize_string(s, eos, tokens, netstatus_token_table)) {
log_warn(LD_DIR, "Error tokenizing network-status header.");
goto err;
}
ns = tor_malloc_zero(sizeof(networkstatus_t));
memcpy(ns->networkstatus_digest, ns_digest, DIGEST_LEN);
tok = find_first_by_keyword(tokens, K_NETWORK_STATUS_VERSION);
tor_assert(tok && tok->n_args >= 1);
if (strcmp(tok->args[0], "2")) {
log_warn(LD_BUG, "Got a non-v2 networkstatus. Version was "
"%s", escaped(tok->args[0]));
goto err;
}
tok = find_first_by_keyword(tokens, K_DIR_SOURCE);
tor_assert(tok);
tor_assert(tok->n_args >= 3);
ns->source_address = tok->args[0]; tok->args[0] = NULL;
if (tor_inet_aton(tok->args[1], &in) == 0) {
log_warn(LD_DIR, "Error parsing network-status source address %s",
escaped(tok->args[1]));
goto err;
}
ns->source_addr = ntohl(in.s_addr);
ns->source_dirport =
(uint16_t) tor_parse_long(tok->args[2],10,0,65535,NULL,NULL);
if (ns->source_dirport == 0) {
log_warn(LD_DIR, "Directory source without dirport; skipping.");
goto err;
}
tok = find_first_by_keyword(tokens, K_FINGERPRINT);
tor_assert(tok);
tor_assert(tok->n_args);
if (base16_decode(ns->identity_digest, DIGEST_LEN, tok->args[0],
strlen(tok->args[0]))) {
log_warn(LD_DIR, "Couldn't decode networkstatus fingerprint %s",
escaped(tok->args[0]));
goto err;
}
if ((tok = find_first_by_keyword(tokens, K_CONTACT))) {
tor_assert(tok->n_args);
ns->contact = tok->args[0];
tok->args[0] = NULL;
}
tok = find_first_by_keyword(tokens, K_DIR_SIGNING_KEY);
tor_assert(tok && tok->key);
ns->signing_key = tok->key;
tok->key = NULL;
if (crypto_pk_get_digest(ns->signing_key, tmp_digest)<0) {
log_warn(LD_DIR, "Couldn't compute signing key digest");
goto err;
}
if (memcmp(tmp_digest, ns->identity_digest, DIGEST_LEN)) {
log_warn(LD_DIR,
"network-status fingerprint did not match dir-signing-key");
goto err;
}
if ((tok = find_first_by_keyword(tokens, K_DIR_OPTIONS))) {
for (i=0; i < tok->n_args; ++i) {
if (!strcmp(tok->args[i], "Names"))
ns->binds_names = 1;
if (!strcmp(tok->args[i], "Versions"))
ns->recommends_versions = 1;
if (!strcmp(tok->args[i], "BadExits"))
ns->lists_bad_exits = 1;
if (!strcmp(tok->args[i], "BadDirectories"))
ns->lists_bad_directories = 1;
}
}
if (ns->recommends_versions) {
if (!(tok = find_first_by_keyword(tokens, K_CLIENT_VERSIONS))) {
log_warn(LD_DIR, "Missing client-versions");
}
ns->client_versions = tok->args[0];
tok->args[0] = NULL;
if (!(tok = find_first_by_keyword(tokens, K_SERVER_VERSIONS)) ||
tok->n_args<1) {
log_warn(LD_DIR, "Missing server-versions on versioning directory");
goto err;
}
ns->server_versions = tok->args[0];
tok->args[0] = NULL;
}
tok = find_first_by_keyword(tokens, K_PUBLISHED);
tor_assert(tok);
tor_assert(tok->n_args == 1);
if (parse_iso_time(tok->args[0], &ns->published_on) < 0) {
goto err;
}
ns->entries = smartlist_create();
s = eos;
SMARTLIST_FOREACH(tokens, directory_token_t *, t, token_free(t));
smartlist_clear(tokens);
while (!strcmpstart(s, "r ")) {
routerstatus_t *rs;
if ((rs = routerstatus_parse_entry_from_string(&s, tokens, NULL, NULL)))
smartlist_add(ns->entries, rs);
}
smartlist_sort(ns->entries, _compare_routerstatus_entries);
smartlist_uniq(ns->entries, _compare_routerstatus_entries,
_free_duplicate_routerstatus_entry);
if (tokenize_string(s, NULL, footer_tokens, dir_footer_token_table)) {
log_warn(LD_DIR, "Error tokenizing network-status footer.");
goto err;
}
if (smartlist_len(footer_tokens) < 1) {
log_warn(LD_DIR, "Too few items in network-status footer.");
goto err;
}
tok = smartlist_get(footer_tokens, smartlist_len(footer_tokens)-1);
if (tok->tp != K_DIRECTORY_SIGNATURE) {
log_warn(LD_DIR,
"Expected network-status footer to end with a signature.");
goto err;
}
note_crypto_pk_op(VERIFY_DIR);
if (check_signature_token(ns_digest, tok, ns->signing_key, 0,
"network-status") < 0)
goto err;
goto done;
err:
if (ns)
networkstatus_free(ns);
ns = NULL;
done:
SMARTLIST_FOREACH(tokens, directory_token_t *, t, token_free(t));
smartlist_free(tokens);
SMARTLIST_FOREACH(footer_tokens, directory_token_t *, t, token_free(t));
smartlist_free(footer_tokens);
return ns;
}
/** DOCDOC */
networkstatus_vote_t *
networkstatus_parse_vote_from_string(const char *s, int is_vote)
{
smartlist_t *tokens = smartlist_create();
smartlist_t *rs_tokens = NULL, *footer_tokens = NULL;
networkstatus_voter_info_t *voter = NULL;
networkstatus_vote_t *ns = NULL;
char ns_digest[DIGEST_LEN];
const char *cert, *end_of_header, *end_of_footer;
directory_token_t *tok;
int ok;
struct in_addr in;
int i, inorder;
if (router_get_networkstatus_v3_hash(s, ns_digest)) {
log_warn(LD_DIR, "Unable to compute digest of network-status");
goto err;
}
end_of_header = find_start_of_next_routerstatus(s);
if (tokenize_string(s, end_of_header, tokens,
is_vote ? networkstatus_vote_token_table :
networkstatus_consensus_token_table)) {
log_warn(LD_DIR, "Error tokenizing network-status vote header.");
goto err;
}
ns = tor_malloc_zero(sizeof(networkstatus_vote_t));
memcpy(ns->networkstatus_digest, ns_digest, DIGEST_LEN);
if (is_vote) {
const char *end_of_cert = NULL;
if (!(cert = strstr(s, "\ndir-key-certificate-version")))
goto err;
++cert;
ns->cert = authority_cert_parse_from_string(cert, &end_of_cert);
if (!ns->cert || !end_of_cert || end_of_cert > end_of_header)
goto err;
}
tok = find_first_by_keyword(tokens, K_VOTE_STATUS);
tor_assert(tok);
tor_assert(tok->n_args);
if (!strcmp(tok->args[0], "vote")) {
ns->is_vote = 1;
} else if (!strcmp(tok->args[0], "consensus")) {
ns->is_vote = 0;
} else {
log_warn(LD_DIR, "Unrecognized vote status %s in network-status",
escaped(tok->args[0]));
goto err;
}
if (!bool_eq(ns->is_vote, is_vote)) {
log_warn(LD_DIR, "Got the wrong kind of v3 networkstatus.");
goto err;
}
if (ns->is_vote) {
tok = find_first_by_keyword(tokens, K_PUBLISHED);
if (parse_iso_time(tok->args[0], &ns->published))
goto err;
}
tok = find_first_by_keyword(tokens, K_VALID_AFTER);
if (parse_iso_time(tok->args[0], &ns->valid_after))
goto err;
tok = find_first_by_keyword(tokens, K_FRESH_UNTIL);
if (parse_iso_time(tok->args[0], &ns->fresh_until))
goto err;
tok = find_first_by_keyword(tokens, K_VALID_UNTIL);
if (parse_iso_time(tok->args[0], &ns->valid_until))
goto err;
tok = find_first_by_keyword(tokens, K_VOTING_DELAY);
tor_assert(tok->n_args >= 2);
ns->vote_seconds =
(int) tor_parse_long(tok->args[0], 10, 0, INT_MAX, &ok, NULL);
if (!ok)
goto err;
ns->dist_seconds =
(int) tor_parse_long(tok->args[0], 10, 0, INT_MAX, &ok, NULL);
if (!ok)
goto err;
if ((tok = find_first_by_keyword(tokens, K_CLIENT_VERSIONS))) {
ns->client_versions = tok->args[0];
tok->args[0] = NULL;
}
if ((tok = find_first_by_keyword(tokens, K_SERVER_VERSIONS))) {
ns->server_versions = tok->args[0];
tok->args[0] = NULL;
}
tok = find_first_by_keyword(tokens, K_KNOWN_FLAGS);
ns->known_flags = smartlist_create();
inorder = 1;
for (i = 0; i < tok->n_args; ++i) {
smartlist_add(ns->known_flags, tok->args[i]);
if (i>0 && strcmp(tok->args[i-1], tok->args[i])>= 0)
inorder = 0;
}
tok->n_args = 0; /* suppress free of args members, but not of args itself. */
if (!inorder) {
log_warn(LD_DIR, "known-flags not in order");
goto err;
}
ns->voters = smartlist_create();
SMARTLIST_FOREACH(tokens, directory_token_t *, _tok,
{
tok = _tok;
if (tok->tp == K_DIR_SOURCE) {
tor_assert(tok->n_args >= 6);
if (voter)
smartlist_add(ns->voters, voter);
voter = tor_malloc_zero(sizeof(networkstatus_voter_info_t));
voter->nickname = tor_strdup(tok->args[0]);
if (strlen(tok->args[1]) != HEX_DIGEST_LEN ||
base16_decode(voter->identity_digest, sizeof(voter->identity_digest),
tok->args[1], HEX_DIGEST_LEN) < 0) {
log_warn(LD_DIR, "Error decoding identity digest %s in "
"network-status vote.", escaped(tok->args[1]));
goto err;
}
voter->address = tor_strdup(tok->args[2]);
if (!tor_inet_aton(tok->args[3], &in)) {
log_warn(LD_DIR, "Error decoding IP address %s in network-status.",
escaped(tok->args[3]));
goto err;
}
voter->dir_port = (uint64_t)
(int) tor_parse_long(tok->args[4], 10, 0, 65535, &ok, NULL);
if (!ok)
goto err;
voter->or_port = (uint64_t)
(int) tor_parse_long(tok->args[5], 10, 0, 65535, &ok, NULL);
if (!ok)
goto err;
} else if (tok->tp == K_CONTACT) {
if (!voter || voter->contact) {
log_warn(LD_DIR, "contact element is out of place.");
goto err;
}
voter->contact = tor_strdup(tok->args[0]);
} else if (tok->tp == K_VOTE_DIGEST) {
tor_assert(!is_vote);
tor_assert(tok->n_args >= 1);
if (!voter || ! tor_digest_is_zero(voter->vote_digest)) {
log_warn(LD_DIR, "vote-digest element is out of place.");
goto err;
}
if (strlen(tok->args[0]) != HEX_DIGEST_LEN ||
base16_decode(voter->vote_digest, sizeof(voter->vote_digest),
tok->args[0], HEX_DIGEST_LEN) < 0) {
log_warn(LD_DIR, "Error decoding vote digest %s in "
"network-status consensus.", escaped(tok->args[1]));
goto err;
}
}
});
if (voter) {
smartlist_add(ns->voters, voter);
voter = NULL;
}
if (smartlist_len(ns->voters) == 0) {
log_warn(LD_DIR, "Missing dir-source elements in a vote networkstatus.");
goto err;
} else if (is_vote && smartlist_len(ns->voters) != 1) {
log_warn(LD_DIR, "Too many dir-source elements in a vote networkstatus.");
goto err;
}
/* Parse routerstatus lines. */
rs_tokens = smartlist_create();
s = end_of_header;
ns->routerstatus_list = smartlist_create();
while (!strcmpstart(s, "r ")) {
if (is_vote) {
vote_routerstatus_t *rs = tor_malloc_zero(sizeof(vote_routerstatus_t));
if (routerstatus_parse_entry_from_string(&s, tokens, ns, rs))
smartlist_add(ns->routerstatus_list, rs);
else {
tor_free(rs->version);
tor_free(rs);
}
} else {
routerstatus_t *rs;
if ((rs =routerstatus_parse_entry_from_string(&s, tokens, NULL, NULL)))
smartlist_add(ns->routerstatus_list, rs);
}
}
for (i = 1; i < smartlist_len(ns->routerstatus_list); ++i) {
routerstatus_t *rs1, *rs2;
if (is_vote) {
vote_routerstatus_t *a = smartlist_get(ns->routerstatus_list, i-1);
vote_routerstatus_t *b = smartlist_get(ns->routerstatus_list, i);
rs1 = &a->status; rs2 = &b->status;
} else {
rs1 = smartlist_get(ns->routerstatus_list, i-1);
rs2 = smartlist_get(ns->routerstatus_list, i);
}
if (memcmp(rs1->identity_digest, rs2->identity_digest, DIGEST_LEN) >= 0) {
log_warn(LD_DIR, "Vote networkstatus entries not sorted by identity "
"digest");
goto err;
}
}
/* Parse footer; check signature. */
footer_tokens = smartlist_create();
end_of_footer = s + strlen(s);
if (tokenize_string(s, end_of_footer, footer_tokens,
networkstatus_vote_footer_token_table)) {
log_warn(LD_DIR, "Error tokenizing network-status vote footer.");
goto err;
}
SMARTLIST_FOREACH(footer_tokens, directory_token_t *, _tok,
{
char declared_identity[DIGEST_LEN];
networkstatus_voter_info_t *v;
tok = _tok;
if (tok->tp != K_DIRECTORY_SIGNATURE)
continue;
tor_assert(tok->n_args >= 2);
if (!tok->object_type ||
strcmp(tok->object_type, "SIGNATURE") ||
tok->object_size < 128 || tok->object_size > 512) {
log_warn(LD_DIR, "Bad object type or length on directory-signature");
goto err;
}
if (strlen(tok->args[0]) != HEX_DIGEST_LEN ||
base16_decode(declared_identity, sizeof(declared_identity),
tok->args[0], HEX_DIGEST_LEN) < 0) {
log_warn(LD_DIR, "Error decoding declared identity %s in "
"network-status vote.", escaped(tok->args[0]));
goto err;
}
if (!(v = networkstatus_get_voter_by_id(ns, declared_identity))) {
log_warn(LD_DIR, "ID on signature on network-status vote does not match"
"any declared directory source.");
goto err;
}
if (strlen(tok->args[1]) != HEX_DIGEST_LEN ||
base16_decode(v->signing_key_digest, sizeof(v->signing_key_digest),
tok->args[1], HEX_DIGEST_LEN) < 0) {
log_warn(LD_DIR, "Error decoding declared digest %s in "
"network-status vote.", escaped(tok->args[1]));
goto err;
}
if (is_vote &&
memcmp(declared_identity, ns->cert->cache_info.identity_digest,
DIGEST_LEN)) {
log_warn(LD_DIR, "Digest mismatch between declared and actual on "
"network-status vote.");
goto err;
/* XXXX020 also check cert against dir-source line. */
}
if (is_vote) {
if (check_signature_token(ns_digest, tok, ns->cert->signing_key, 0,
"network-status vote"))
goto err;
v->good_signature = 1;
} else {
v->pending_signature = tor_memdup(tok->object_body,
tok->object_size);
v->pending_signature_len = tok->object_size;
}
});
/* XXXX020 check dates for plausibility. ??? */
goto done;
err:
if (ns)
networkstatus_vote_free(ns);
ns = NULL;
done:
if (tokens) {
SMARTLIST_FOREACH(tokens, directory_token_t *, t, token_free(t));
smartlist_free(tokens);
}
if (voter) {
tor_free(voter->nickname);
tor_free(voter->address);
tor_free(voter->contact);
tor_free(voter);
}
if (rs_tokens) {
SMARTLIST_FOREACH(rs_tokens, directory_token_t *, t, token_free(t));
smartlist_free(rs_tokens);
}
if (footer_tokens) {
SMARTLIST_FOREACH(footer_tokens, directory_token_t *, t, token_free(t));
smartlist_free(footer_tokens);
}
return ns;
}
/** Parse the addr policy in the string s and return it. If
* assume_action is nonnegative, then insert its action (ADDR_POLICY_ACCEPT or
* ADDR_POLICY_REJECT) for items that specify no action.
*/
addr_policy_t *
router_parse_addr_policy_from_string(const char *s, int assume_action)
{
directory_token_t *tok = NULL;
const char *cp;
char *tmp;
addr_policy_t *r;
size_t len, idx;
/* *s might not end with \n, so we need to extend it with one. */
len = strlen(s);
cp = tmp = tor_malloc(len+2);
for (idx = 0; idx < len; ++idx) {
tmp[idx] = TOR_TOLOWER(s[idx]);
}
tmp[len]='\n';
tmp[len+1]='\0';
while (TOR_ISSPACE(*cp))
++cp;
if ((*cp == '*' || TOR_ISDIGIT(*cp)) && assume_action >= 0) {
char *new_str = tor_malloc(len+10);
tor_snprintf(new_str, len+10, "%s %s\n",
assume_action == ADDR_POLICY_ACCEPT?"accept":"reject", cp);
tor_free(tmp);
cp = tmp = new_str;
}
tok = get_next_token(&cp, routerdesc_token_table);
if (tok->tp == _ERR) {
log_warn(LD_DIR, "Error reading address policy: %s", tok->error);
goto err;
}
if (tok->tp != K_ACCEPT && tok->tp != K_REJECT) {
log_warn(LD_DIR, "Expected 'accept' or 'reject'.");
goto err;
}
/* Now that we've gotten an addr policy, add it to the router. */
r = router_parse_addr_policy(tok);
goto done;
err:
r = NULL;
done:
tor_free(tmp);
token_free(tok);
return r;
}
/** Add an exit policy stored in the token tok to the router info in
* router. Return 0 on success, -1 on failure. */
static int
router_add_exit_policy(routerinfo_t *router, directory_token_t *tok)
{
addr_policy_t *newe, **tmpe;
newe = router_parse_addr_policy(tok);
if (!newe)
return -1;
for (tmpe = &router->exit_policy; *tmpe; tmpe=&((*tmpe)->next))
;
*tmpe = newe;
return 0;
}
/** Given a K_ACCEPT or K_REJECT token and a router, create and return
* a new exit_policy_t corresponding to the token. */
static addr_policy_t *
router_parse_addr_policy(directory_token_t *tok)
{
addr_policy_t *newe;
char *arg;
char buf[POLICY_BUF_LEN];
tor_assert(tok->tp == K_REJECT || tok->tp == K_ACCEPT);
if (tok->n_args != 1)
return NULL;
arg = tok->args[0];
if (!strcmpstart(arg,"private"))
return router_parse_addr_policy_private(tok);
newe = tor_malloc_zero(sizeof(addr_policy_t));
newe->policy_type = (tok->tp == K_REJECT) ? ADDR_POLICY_REJECT
: ADDR_POLICY_ACCEPT;
if (parse_addr_and_port_range(arg, &newe->addr, &newe->msk,
&newe->prt_min, &newe->prt_max))
goto policy_read_failed;
if (policy_write_item(buf, sizeof(buf), newe) < 0)
goto policy_read_failed;
newe->string = tor_strdup(buf);
return newe;
policy_read_failed:
log_warn(LD_DIR,"Couldn't parse line %s. Dropping", escaped(arg));
tor_free(newe);
return NULL;
}
/** Parse an exit policy line of the format "accept/reject private:...".
* This didn't exist until Tor 0.1.1.15, so nobody should generate it in
* router descriptors until earlier versions are obsolete.
*/
static addr_policy_t *
router_parse_addr_policy_private(directory_token_t *tok)
{
static const char *private_nets[] = {
"0.0.0.0/8", "169.254.0.0/16",
"127.0.0.0/8", "192.168.0.0/16", "10.0.0.0/8", "172.16.0.0/12",NULL };
char *arg;
addr_policy_t *result, **nextp;
int net;
uint16_t port_min, port_max;
arg = tok->args[0];
if (strcmpstart(arg, "private"))
return NULL;
arg += strlen("private");
arg = (char*) eat_whitespace(arg);
if (!arg || *arg != ':')
return NULL;
if (parse_port_range(arg+1, &port_min, &port_max)<0)
return NULL;
nextp = &result;
for (net = 0; private_nets[net]; ++net) {
size_t len;
*nextp = tor_malloc_zero(sizeof(addr_policy_t));
(*nextp)->policy_type = (tok->tp == K_REJECT) ? ADDR_POLICY_REJECT
: ADDR_POLICY_ACCEPT;
len = strlen(arg)+strlen(private_nets[net])+16;
(*nextp)->string = tor_malloc(len+1);
tor_snprintf((*nextp)->string, len, "%s %s%s",
tok->tp == K_REJECT ? "reject" : "accept",
private_nets[net], arg);
if (parse_addr_and_port_range((*nextp)->string + 7,
&(*nextp)->addr, &(*nextp)->msk,
&(*nextp)->prt_min, &(*nextp)->prt_max)) {
log_warn(LD_BUG, "Couldn't parse an address range we generated!");
return NULL;
}
nextp = &(*nextp)->next;
}
return result;
}
/** Log and exit if t is malformed */
void
assert_addr_policy_ok(addr_policy_t *t)
{
addr_policy_t *t2;
while (t) {
tor_assert(t->policy_type == ADDR_POLICY_REJECT ||
t->policy_type == ADDR_POLICY_ACCEPT);
tor_assert(t->prt_min <= t->prt_max);
t2 = router_parse_addr_policy_from_string(t->string, -1);
tor_assert(t2);
tor_assert(t2->policy_type == t->policy_type);
tor_assert(t2->addr == t->addr);
tor_assert(t2->msk == t->msk);
tor_assert(t2->prt_min == t->prt_min);
tor_assert(t2->prt_max == t->prt_max);
tor_assert(!strcmp(t2->string, t->string));
tor_assert(t2->next == NULL);
addr_policy_free(t2);
t = t->next;
}
}
/*
* Low-level tokenizer for router descriptors and directories.
*/
/** Free all resources allocated for tok */
static void
token_free(directory_token_t *tok)
{
int i;
tor_assert(tok);
if (tok->args) {
for (i = 0; i < tok->n_args; ++i) {
tor_free(tok->args[i]);
}
tor_free(tok->args);
}
tor_free(tok->object_type);
tor_free(tok->object_body);
tor_free(tok->error);
if (tok->key)
crypto_free_pk_env(tok->key);
tor_free(tok);
}
#define RET_ERR(msg) \
do { \
if (tok) token_free(tok); \
tok = tor_malloc_zero(sizeof(directory_token_t)); \
tok->tp = _ERR; \
tok->error = tor_strdup(msg); \
goto done_tokenizing; } while (0)
static INLINE directory_token_t *
token_check_object(const char *kwd,
directory_token_t *tok, obj_syntax o_syn)
{
char ebuf[128];
switch (o_syn) {
case NO_OBJ:
if (tok->object_body) {
tor_snprintf(ebuf, sizeof(ebuf), "Unexpected object for %s", kwd);
RET_ERR(ebuf);
}
if (tok->key) {
tor_snprintf(ebuf, sizeof(ebuf), "Unexpected public key for %s", kwd);
RET_ERR(ebuf);
}
break;
case NEED_OBJ:
if (!tok->object_body) {
tor_snprintf(ebuf, sizeof(ebuf), "Missing object for %s", kwd);
RET_ERR(ebuf);
}
break;
case NEED_KEY_1024:
if (tok->key && crypto_pk_keysize(tok->key) != PK_BYTES) {
tor_snprintf(ebuf, sizeof(ebuf), "Wrong size on key for %s: %d bits",
kwd, (int)crypto_pk_keysize(tok->key));
RET_ERR(ebuf);
}
/* fall through */
case NEED_KEY:
if (!tok->key) {
tor_snprintf(ebuf, sizeof(ebuf), "Missing public key for %s", kwd);
}
break;
case OBJ_OK:
break;
}
done_tokenizing:
return tok;
}
/** Helper function: read the next token from *s, advance *s to the end of the
* token, and return the parsed token. Parse *s according to the list
* of tokens in table.
*/
static directory_token_t *
get_next_token(const char **s, token_rule_t *table)
{
const char *next, *obstart;
int i, j, done, allocated;
directory_token_t *tok;
obj_syntax o_syn = NO_OBJ;
char ebuf[128];
const char *kwd = "";
#define RET_ERR(msg) \
do { \
if (tok) token_free(tok); \
tok = tor_malloc_zero(sizeof(directory_token_t)); \
tok->tp = _ERR; \
tok->error = tor_strdup(msg); \
goto done_tokenizing; } while (0)
tok = tor_malloc_zero(sizeof(directory_token_t));
tok->tp = _ERR;
*s = eat_whitespace(*s);
if (!**s) {
tok->tp = _EOF;
return tok;
}
next = find_whitespace(*s);
if (!next) {
tok->error = tor_strdup("Unexpected EOF"); return tok;
}
/* It's a keyword... but which one? */
if (!strncmp("opt", *s, next-*s)) {
/* Skip past an "opt" at the start of the line. */
*s = eat_whitespace(next);
next = NULL;
if (**s)
next = find_whitespace(*s);
if (!**s || !next) {
RET_ERR("opt without keyword");
}
}
/* Search the table for the appropriate entry. (I tried a binary search
* instead, but it wasn't any faster.) */
for (i = 0; table[i].t ; ++i) {
if (!strncmp(table[i].t, *s, next-*s)) {
/* We've found the keyword. */
kwd = table[i].t;
tok->tp = table[i].v;
o_syn = table[i].os;
if (table[i].concat_args) {
/* The keyword takes the line as a single argument */
*s = eat_whitespace_no_nl(next);
next = strchr(*s, '\n');
if (!next)
RET_ERR("Unexpected EOF");
tok->args = tor_malloc(sizeof(char*));
tok->args[0] = tor_strndup(*s,next-*s);
tok->n_args = 1;
*s = eat_whitespace_no_nl(next+1);
} else {
/* This keyword takes multiple arguments. */
j = 0;
done = (*next == '\n');
allocated = 32;
tok->args = tor_malloc(sizeof(char*)*32);
*s = eat_whitespace_no_nl(next);
while (**s != '\n' && !done) {
next = find_whitespace(*s);
if (*next == '\n')
done = 1;
if (j == allocated) {
allocated *= 2;
tok->args = tor_realloc(tok->args,sizeof(char*)*allocated);
}
tok->args[j++] = tor_strndup(*s,next-*s);
*s = eat_whitespace_no_nl(next+1);
}
tok->n_args = j;
}
if (tok->n_args < table[i].min_args) {
tor_snprintf(ebuf, sizeof(ebuf), "Too few arguments to %s", kwd);
RET_ERR(ebuf);
} else if (tok->n_args > table[i].max_args) {
tor_snprintf(ebuf, sizeof(ebuf), "Too many arguments to %s", kwd);
RET_ERR(ebuf);
}
break;
}
}
if (tok->tp == _ERR) {
tok->tp = K_OPT;
*s = eat_whitespace_no_nl(next);
next = strchr(*s,'\n');
if (!next)
RET_ERR("Unexpected EOF");
tok->args = tor_malloc(sizeof(char*));
tok->args[0] = tor_strndup(*s,next-*s);
tok->n_args = 1;
*s = eat_whitespace_no_nl(next+1);
o_syn = OBJ_OK;
}
*s = eat_whitespace(*s);
if (strcmpstart(*s, "-----BEGIN ")) {
goto check_object;
}
obstart = *s;
*s += 11; /* length of "-----BEGIN ". */
next = strchr(*s, '\n');
if (next-*s < 6 || strcmpstart(next-5, "-----\n")) {
RET_ERR("Malformed object: bad begin line");
}
tok->object_type = tor_strndup(*s, next-*s-5);
*s = next+1;
next = strstr(*s, "-----END ");
if (!next) {
RET_ERR("Malformed object: missing end line");
}
if (!strcmp(tok->object_type, "RSA PUBLIC KEY")) {
if (strcmpstart(next, "-----END RSA PUBLIC KEY-----\n"))
RET_ERR("Malformed object: mismatched end line");
next = strchr(next,'\n')+1;
tok->key = crypto_new_pk_env();
if (crypto_pk_read_public_key_from_string(tok->key, obstart, next-obstart))
RET_ERR("Couldn't parse public key.");
*s = next;
} else {
tok->object_body = tor_malloc(next-*s); /* really, this is too much RAM. */
i = base64_decode(tok->object_body, 256, *s, next-*s);
if (i<0) {
RET_ERR("Malformed object: bad base64-encoded data");
}
tok->object_size = i;
*s = next + 9; /* length of "-----END ". */
i = strlen(tok->object_type);
if (strncmp(*s, tok->object_type, i) || strcmpstart(*s+i, "-----\n")) {
RET_ERR("Malformed object: mismatched end tag");
}
*s += i+6;
}
check_object:
tok = token_check_object(kwd, tok, o_syn);
done_tokenizing:
return tok;
#undef RET_ERR
}
/** Read all tokens from a string between start and end, and add
* them to out. Parse according to the token rules in table.
*/
static int
tokenize_string(const char *start, const char *end, smartlist_t *out,
token_rule_t *table)
{
const char **s;
directory_token_t *tok = NULL;
int counts[_NIL];
int i;
s = &start;
if (!end)
end = start+strlen(start);
for (i = 0; i < _NIL; ++i)
counts[i] = 0;
while (*s < end && (!tok || tok->tp != _EOF)) {
tok = get_next_token(s, table);
if (tok->tp == _ERR) {
log_warn(LD_DIR, "parse error: %s", tok->error);
return -1;
}
++counts[tok->tp];
smartlist_add(out, tok);
*s = eat_whitespace(*s);
}
for (i = 0; table[i].t; ++i) {
if (counts[table[i].v] < table[i].min_cnt) {
log_warn(LD_DIR, "Parse error: missing %s element.", table[i].t);
return -1;
}
if (counts[table[i].v] > table[i].max_cnt) {
log_warn(LD_DIR, "Parse error: too many %s elements.", table[i].t);
return -1;
}
if (table[i].pos & AT_START) {
if (smartlist_len(out) < 1 ||
(tok = smartlist_get(out, 0))->tp != table[i].v) {
log_warn(LD_DIR, "Parse error: first item is not %s.", table[i].t);
return -1;
}
}
if (table[i].pos & AT_END) {
if (smartlist_len(out) < 1 ||
(tok = smartlist_get(out, smartlist_len(out)-1))->tp != table[i].v) {
log_warn(LD_DIR, "Parse error: last item is not %s.", table[i].t);
return -1;
}
}
}
return 0;
}
/** Find the first token in s whose keyword is keyword; return
* NULL if no such keyword is found.
*/
static directory_token_t *
find_first_by_keyword(smartlist_t *s, directory_keyword keyword)
{
SMARTLIST_FOREACH(s, directory_token_t *, t, if (t->tp == keyword) return t);
return NULL;
}
/** Return a newly allocated smartlist of all accept or reject tokens in
* s.
*/
static smartlist_t *
find_all_exitpolicy(smartlist_t *s)
{
smartlist_t *out = smartlist_create();
SMARTLIST_FOREACH(s, directory_token_t *, t,
if (t->tp == K_ACCEPT || t->tp == K_REJECT)
smartlist_add(out,t));
return out;
}
/** Compute the SHA-1 digest of the substring of s taken from the first
* occurrence of start_str through the first instance of c after the
* first subsequent occurrence of end_str; store the 20-byte result in
* digest; return 0 on success.
*
* If no such substring exists, return -1.
*/
static int
router_get_hash_impl(const char *s, char *digest,
const char *start_str,
const char *end_str, char end_c)
{
char *start, *end;
start = strstr(s, start_str);
if (!start) {
log_warn(LD_DIR,"couldn't find start of hashed material \"%s\"",start_str);
return -1;
}
if (start != s && *(start-1) != '\n') {
log_warn(LD_DIR,
"first occurrence of \"%s\" is not at the start of a line",
start_str);
return -1;
}
end = strstr(start+strlen(start_str), end_str);
if (!end) {
log_warn(LD_DIR,"couldn't find end of hashed material \"%s\"",end_str);
return -1;
}
end = strchr(end+strlen(end_str), end_c);
if (!end) {
log_warn(LD_DIR,"couldn't find EOL");
return -1;
}
++end;
if (crypto_digest(digest, start, end-start)) {
log_warn(LD_BUG,"couldn't compute digest");
return -1;
}
return 0;
}
/** Parse the Tor version of the platform string platform,
* and compare it to the version in cutoff. Return 1 if
* the router is at least as new as the cutoff, else return 0.
*/
int
tor_version_as_new_as(const char *platform, const char *cutoff)
{
tor_version_t cutoff_version, router_version;
char *s, *s2, *start;
char tmp[128];
tor_assert(platform);
if (tor_version_parse(cutoff, &cutoff_version)<0) {
log_warn(LD_BUG,"cutoff version '%s' unparseable.",cutoff);
return 0;
}
if (strcmpstart(platform,"Tor ")) /* nonstandard Tor; be safe and say yes */
return 1;
start = (char *)eat_whitespace(platform+3);
if (!*start) return 0;
s = (char *)find_whitespace(start); /* also finds '\0', which is fine */
s2 = (char*)eat_whitespace(s);
if (!strcmpstart(s2, "(r"))
s = (char*)find_whitespace(s2);
if ((size_t)(s-start+1) >= sizeof(tmp)) /* too big, no */
return 0;
strlcpy(tmp, start, s-start+1);
if (tor_version_parse(tmp, &router_version)<0) {
log_info(LD_DIR,"Router version '%s' unparseable.",tmp);
return 1; /* be safe and say yes */
}
/* Here's why we don't need to do any special handling for svn revisions:
* - If neither has an svn revision, we're fine.
* - If the router doesn't have an svn revision, we can't assume that it
* is "at least" any svn revision, so we need to return 0.
* - If the target version doesn't have an svn revision, any svn revision
* (or none at all) is good enough, so return 1.
* - If both target and router have an svn revision, we compare them.
*/
return tor_version_compare(&router_version, &cutoff_version) >= 0;
}
/** Parse a tor version from s, and store the result in out.
* Return 0 on success, -1 on failure. */
int
tor_version_parse(const char *s, tor_version_t *out)
{
char *eos=NULL;
const char *cp=NULL;
/* Format is:
* "Tor " ? NUM dot NUM dot NUM [ ( pre | rc | dot ) NUM [ - tag ] ]
*/
tor_assert(s);
tor_assert(out);
memset(out, 0, sizeof(tor_version_t));
if (!strcasecmpstart(s, "Tor "))
s += 4;
/* Get major. */
out->major = strtol(s,&eos,10);
if (!eos || eos==s || *eos != '.') return -1;
cp = eos+1;
/* Get minor */
out->minor = strtol(cp,&eos,10);
if (!eos || eos==cp || *eos != '.') return -1;
cp = eos+1;
/* Get micro */
out->micro = strtol(cp,&eos,10);
if (!eos || eos==cp) return -1;
if (!*eos) {
out->status = VER_RELEASE;
out->patchlevel = 0;
return 0;
}
cp = eos;
/* Get status */
if (*cp == '.') {
out->status = VER_RELEASE;
++cp;
} else if (0==strncmp(cp, "pre", 3)) {
out->status = VER_PRE;
cp += 3;
} else if (0==strncmp(cp, "rc", 2)) {
out->status = VER_RC;
cp += 2;
} else {
return -1;
}
/* Get patchlevel */
out->patchlevel = strtol(cp,&eos,10);
if (!eos || eos==cp) return -1;
cp = eos;
/* Get status tag. */
if (*cp == '-' || *cp == '.')
++cp;
eos = (char*) find_whitespace(cp);
if (eos-cp >= (int)sizeof(out->status_tag))
strlcpy(out->status_tag, cp, sizeof(out->status_tag));
else {
memcpy(out->status_tag, cp, eos-cp);
out->status_tag[eos-cp] = 0;
}
cp = eat_whitespace(eos);
if (!strcmpstart(cp, "(r")) {
cp += 2;
out->svn_revision = strtol(cp,&eos,10);
}
return 0;
}
/** Compare two tor versions; Return <0 if a < b; 0 if a ==b, >0 if a >
* b. */
int
tor_version_compare(tor_version_t *a, tor_version_t *b)
{
int i;
tor_assert(a);
tor_assert(b);
if ((i = a->major - b->major))
return i;
else if ((i = a->minor - b->minor))
return i;
else if ((i = a->micro - b->micro))
return i;
else if ((i = a->status - b->status))
return i;
else if ((i = a->patchlevel - b->patchlevel))
return i;
else if ((i = strcmp(a->status_tag, b->status_tag)))
return i;
else
return a->svn_revision - b->svn_revision;
}
/** Return true iff versions a and b belong to the same series.
*/
static int
tor_version_same_series(tor_version_t *a, tor_version_t *b)
{
tor_assert(a);
tor_assert(b);
return ((a->major == b->major) &&
(a->minor == b->minor) &&
(a->micro == b->micro));
}
/** Helper: Given pointers to two strings describing tor versions, return -1
* if _a precedes _b, 1 if _b preceeds _a, and 0 if they are equivalent.
* Used to sort a list of versions. */
static int
_compare_tor_version_str_ptr(const void **_a, const void **_b)
{
const char *a = *_a, *b = *_b;
int ca, cb;
tor_version_t va, vb;
ca = tor_version_parse(a, &va);
cb = tor_version_parse(b, &vb);
/* If they both parse, compare them. */
if (!ca && !cb)
return tor_version_compare(&va,&vb);
/* If one parses, it comes first. */
if (!ca && cb)
return -1;
if (ca && !cb)
return 1;
/* If neither parses, compare strings. Also, the directory server admin
** needs to be smacked upside the head. But Tor is tolerant and gentle. */
return strcmp(a,b);
}
/** Sort a list of string-representations of versions in ascending order. */
void
sort_version_list(smartlist_t *versions, int remove_duplicates)
{
smartlist_sort(versions, _compare_tor_version_str_ptr);
if (remove_duplicates)
smartlist_uniq(versions, _compare_tor_version_str_ptr, NULL);
}