tor-commits November 2016

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[tor/master] New authentication types to use RFC5705.
by nickm＠torproject.org 03 Nov '16

03 Nov '16

commit b004ff45d7f637675be976737eb7efea8da5b49c Author: Nick Mathewson <nickm(a)torproject.org> Date: Tue May 10 16:47:52 2016 -0400 New authentication types to use RFC5705. See proposal 244. This feature lets us stop looking at the internals of SSL objects, *and* should let us port better to more SSL libraries, if they have RFC5705 support. Preparatory for #19156 --- src/common/tortls.c | 22 ++++++++++++++++++++++ src/common/tortls.h | 5 +++++ src/or/connection_or.c | 39 ++++++++++++++++++++++++++++++++++----- src/or/or.h | 23 ++++++++++++++++++++++- 4 files changed, 83 insertions(+), 6 deletions(-) diff --git a/src/common/tortls.c b/src/common/tortls.c index 23889be..eaa5748 100644 --- a/src/common/tortls.c +++ b/src/common/tortls.c @@ -2448,6 +2448,28 @@ tor_tls_get_tlssecrets,(tor_tls_t *tls, uint8_t *secrets_out)) return 0; } +/** Using the RFC5705 key material exporting construction, and the + * provided context (context_len bytes long) and + * label (a NUL-terminated string), compute a 32-byte secret in + * secrets_out that only the parties to this TLS session can + * compute. Return 0 on success and -1 on failure. + */ +MOCK_IMPL(int, +tor_tls_export_key_material,(tor_tls_t *tls, uint8_t *secrets_out, + const uint8_t *context, + size_t context_len, + const char *label)) +{ + tor_assert(tls); + tor_assert(tls->ssl); + + int r = SSL_export_keying_material(tls->ssl, + secrets_out, DIGEST256_LEN, + label, strlen(label), + context, context_len, 1); + return (r == 1) ? 0 : -1; +} + /** Examine the amount of memory used and available for buffers in tls. * Set *rbuf_capacity to the amount of storage allocated for the read * buffer and *rbuf_bytes to the amount actually used. diff --git a/src/common/tortls.h b/src/common/tortls.h index 7c035a2..fe5898e 100644 --- a/src/common/tortls.h +++ b/src/common/tortls.h @@ -226,6 +226,11 @@ int tor_tls_used_v1_handshake(tor_tls_t *tls); int tor_tls_get_num_server_handshakes(tor_tls_t *tls); int tor_tls_server_got_renegotiate(tor_tls_t *tls); MOCK_DECL(int,tor_tls_get_tlssecrets,(tor_tls_t *tls, uint8_t *secrets_out)); +MOCK_DECL(int,tor_tls_export_key_material,( + tor_tls_t *tls, uint8_t *secrets_out, + const uint8_t *context, + size_t context_len, + const char *label)); /* Log and abort if there are unhandled TLS errors in OpenSSL's error stack. */ diff --git a/src/or/connection_or.c b/src/or/connection_or.c index 09579f8..d06a246 100644 --- a/src/or/connection_or.c +++ b/src/or/connection_or.c @@ -2318,15 +2318,34 @@ connection_or_compute_authenticate_cell_body(or_connection_t *conn, auth1_t *auth = NULL; auth_ctx_t *ctx = auth_ctx_new(); int result; + int old_tlssecrets_algorithm = 0; + const char *authtype_str = NULL; - /* assert state is reasonable XXXX */ + int is_ed = 0; + const int authtype = 1; /* XXXX this should be an argument. */ - ctx->is_ed = 0; + /* assert state is reasonable XXXX */ + switch (authtype) { + case AUTHTYPE_RSA_SHA256_TLSSECRET: + authtype_str = "AUTH0001"; + old_tlssecrets_algorithm = 1; + break; + case AUTHTYPE_RSA_SHA256_RFC5705: + authtype_str = "AUTH0002"; + break; + case AUTHTYPE_ED25519_SHA256_RFC5705: + authtype_str = "AUTH0003"; + is_ed = 1; + break; + default: + tor_assert(0); + break; + } auth = auth1_new(); /* Type: 8 bytes. */ - memcpy(auth1_getarray_type(auth), "AUTH0001", 8); + memcpy(auth1_getarray_type(auth), authtype_str, 8); { const tor_x509_cert_t *id_cert=NULL, *link_cert=NULL; @@ -2380,7 +2399,8 @@ connection_or_compute_authenticate_cell_body(or_connection_t *conn, cert = freecert; } if (!cert) { - log_warn(LD_OR, "Unable to find cert when making AUTH1 data."); + log_warn(LD_OR, "Unable to find cert when making %s data.", + authtype_str); goto err; } @@ -2392,7 +2412,16 @@ connection_or_compute_authenticate_cell_body(or_connection_t *conn, } /* HMAC of clientrandom and serverrandom using master key : 32 octets */ - tor_tls_get_tlssecrets(conn->tls, auth->tlssecrets); + if (old_tlssecrets_algorithm) { + tor_tls_get_tlssecrets(conn->tls, auth->tlssecrets); + } else { + char label[128]; + tor_snprintf(label, sizeof(label), + "EXPORTER FOR TOR TLS CLIENT BINDING %s", authtype_str); + tor_tls_export_key_material(conn->tls, auth->tlssecrets, + auth->cid, sizeof(auth->cid), + label); + } /* 8 octets were reserved for the current time, but we're trying to get out * of the habit of sending time around willynilly. Fortunately, nothing diff --git a/src/or/or.h b/src/or/or.h index 5b9b007..402fbfd 100644 --- a/src/or/or.h +++ b/src/or/or.h @@ -1348,13 +1348,34 @@ typedef struct listener_connection_t { #define OR_CERT_TYPE_RSA_ED_CROSSCERT 7 /**@}*/ -/** The one currently supported type of AUTHENTICATE cell. It contains +/** The first supported type of AUTHENTICATE cell. It contains * a bunch of structures signed with an RSA1024 key. The signed * structures include a HMAC using negotiated TLS secrets, and a digest * of all cells sent or received before the AUTHENTICATE cell (including * the random server-generated AUTH_CHALLENGE cell). */ #define AUTHTYPE_RSA_SHA256_TLSSECRET 1 +/** As AUTHTYPE_RSA_SHA256_TLSSECRET, but instead of using the + * negotiated TLS secrets, uses exported keying material from the TLS + * session as described in RFC 5705. + * + * Not used by today's tors, since everything that supports this + * also supports ED25519_SHA3_5705, which is better. + **/ +#define AUTHTYPE_RSA_SHA256_RFC5705 2 +/** As AUTHTYPE_RSA_SHA256_RFC5705, but uses an Ed25519 identity key to + * authenticate. */ +#define AUTHTYPE_ED25519_SHA256_RFC5705 3 +/* + * NOTE: authchallenge_type_is_better() relies on these AUTHTYPE codes + * being sorted in order of preference. If we someday add one with + * a higher numerical value that we don't like as much, we should revise + * authchallenge_type_is_better(). + */ + + + + /** The length of the part of the AUTHENTICATE cell body that the client and * server can generate independently (when using RSA_SHA256_TLSSECRET). It

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[tor/master] Free rsa_ed_crosscert at exit.
by nickm＠torproject.org 03 Nov '16

03 Nov '16

commit e94f1b4e0d4b31ed80e2eefb8700f2671817f561 Author: Nick Mathewson <nickm(a)torproject.org> Date: Tue Aug 30 11:10:03 2016 -0400 Free rsa_ed_crosscert at exit. Fixes bug 17779; bugfix on 0.2.7.2-alpha. --- changes/bug17779 | 6 ++++++ src/or/routerkeys.c | 3 +++ 2 files changed, 9 insertions(+) diff --git a/changes/bug17779 b/changes/bug17779 new file mode 100644 index 0000000..0ed2d12 --- /dev/null +++ b/changes/bug17779 @@ -0,0 +1,6 @@ + o Minor bugfixes (leak at exit): + - Fix a small harmless memory leak at exit of the previously unused + RSA->Ed identity cross-certificate. Fixes 17779; bugfix on + 0.2.7.2-alpha. + + diff --git a/src/or/routerkeys.c b/src/or/routerkeys.c index 060ffd8..6d3ad40 100644 --- a/src/or/routerkeys.c +++ b/src/or/routerkeys.c @@ -1139,9 +1139,12 @@ routerkeys_free_all(void) tor_cert_free(signing_key_cert); tor_cert_free(link_cert_cert); tor_cert_free(auth_key_cert); + tor_free(rsa_ed_crosscert); master_identity_key = master_signing_key = NULL; current_auth_key = NULL; signing_key_cert = link_cert_cert = auth_key_cert = NULL; + rsa_ed_crosscert = NULL; // redundant + rsa_ed_crosscert_len = 0; }

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[tor/master] Make the current time an argument to x509 cert-checking functions
by nickm＠torproject.org 03 Nov '16

03 Nov '16

commit 0b4221f98dbb93c9322e7a778f04bcbcfcc79738 Author: Nick Mathewson <nickm(a)torproject.org> Date: Wed Aug 10 20:02:03 2016 -0400 Make the current time an argument to x509 cert-checking functions This makes the code a bit cleaner by having more of the functions be pure functions that don't depend on the current time. --- src/common/tortls.c | 25 ++++++++++++++----------- src/common/tortls.h | 4 +++- src/or/channeltls.c | 3 ++- src/or/torcert.c | 15 +++++++++------ src/or/torcert.h | 4 ++-- src/test/test_tortls.c | 26 +++++++++++++------------- 6 files changed, 43 insertions(+), 34 deletions(-) diff --git a/src/common/tortls.c b/src/common/tortls.c index eaa5748..fd86981 100644 --- a/src/common/tortls.c +++ b/src/common/tortls.c @@ -136,6 +136,7 @@ static void tor_tls_context_decref(tor_tls_context_t *ctx); static void tor_tls_context_incref(tor_tls_context_t *ctx); static int check_cert_lifetime_internal(int severity, const X509 *cert, + time_t now, int past_tolerance, int future_tolerance); /** Global TLS contexts. We keep them here because nobody else needs @@ -860,6 +861,7 @@ int tor_tls_cert_is_valid(int severity, const tor_x509_cert_t *cert, const tor_x509_cert_t *signing_cert, + time_t now, int check_rsa_1024) { check_no_tls_errors(); @@ -879,7 +881,7 @@ tor_tls_cert_is_valid(int severity, /* okay, the signature checked out right. Now let's check the check the * lifetime. */ - if (check_cert_lifetime_internal(severity, cert->cert, + if (check_cert_lifetime_internal(severity, cert->cert, now, 48*60*60, 30*24*60*60) < 0) goto bad; @@ -2028,13 +2030,13 @@ tor_tls_get_peer_cert,(tor_tls_t *tls)) /** Warn that a certificate lifetime extends through a certain range. */ static void -log_cert_lifetime(int severity, const X509 *cert, const char *problem) +log_cert_lifetime(int severity, const X509 *cert, const char *problem, + time_t now) { BIO *bio = NULL; BUF_MEM *buf; char *s1=NULL, *s2=NULL; char mytime[33]; - time_t now = time(NULL); struct tm tm; size_t n; @@ -2182,6 +2184,7 @@ tor_tls_verify(int severity, tor_tls_t *tls, crypto_pk_t **identity_key) */ int tor_tls_check_lifetime(int severity, tor_tls_t *tls, + time_t now, int past_tolerance, int future_tolerance) { X509 *cert; @@ -2190,7 +2193,7 @@ tor_tls_check_lifetime(int severity, tor_tls_t *tls, if (!(cert = SSL_get_peer_certificate(tls->ssl))) goto done; - if (check_cert_lifetime_internal(severity, cert, + if (check_cert_lifetime_internal(severity, cert, now, past_tolerance, future_tolerance) < 0) goto done; @@ -2206,24 +2209,24 @@ tor_tls_check_lifetime(int severity, tor_tls_t *tls, /** Helper: check whether cert is expired give or take * past_tolerance seconds, or not-yet-valid give or take - * future_tolerance seconds. If it is live, return 0. If it is not - * live, log a message and return -1. */ + * future_tolerance seconds. (Relative to the current time + * now.) If it is live, return 0. If it is not live, log a message + * and return -1. */ static int check_cert_lifetime_internal(int severity, const X509 *cert, + time_t now, int past_tolerance, int future_tolerance) { - time_t now, t; - - now = time(NULL); + time_t t; t = now + future_tolerance; if (X509_cmp_time(X509_get_notBefore_const(cert), &t) > 0) { - log_cert_lifetime(severity, cert, "not yet valid"); + log_cert_lifetime(severity, cert, "not yet valid", now); return -1; } t = now - past_tolerance; if (X509_cmp_time(X509_get_notAfter_const(cert), &t) < 0) { - log_cert_lifetime(severity, cert, "already expired"); + log_cert_lifetime(severity, cert, "already expired", now); return -1; } diff --git a/src/common/tortls.h b/src/common/tortls.h index fe5898e..3adb1b2 100644 --- a/src/common/tortls.h +++ b/src/common/tortls.h @@ -200,7 +200,8 @@ int tor_tls_peer_has_cert(tor_tls_t *tls); MOCK_DECL(tor_x509_cert_t *,tor_tls_get_peer_cert,(tor_tls_t *tls)); int tor_tls_verify(int severity, tor_tls_t *tls, crypto_pk_t **identity); int tor_tls_check_lifetime(int severity, - tor_tls_t *tls, int past_tolerance, + tor_tls_t *tls, time_t now, + int past_tolerance, int future_tolerance); MOCK_DECL(int, tor_tls_read, (tor_tls_t *tls, char *cp, size_t len)); int tor_tls_write(tor_tls_t *tls, const char *cp, size_t n); @@ -259,6 +260,7 @@ MOCK_DECL(int,tor_tls_cert_matches_key,(const tor_tls_t *tls, int tor_tls_cert_is_valid(int severity, const tor_x509_cert_t *cert, const tor_x509_cert_t *signing_cert, + time_t now, int check_rsa_1024); const char *tor_tls_get_ciphersuite_name(tor_tls_t *tls); diff --git a/src/or/channeltls.c b/src/or/channeltls.c index cf57c29..9315f80 100644 --- a/src/or/channeltls.c +++ b/src/or/channeltls.c @@ -1918,7 +1918,8 @@ channel_tls_process_certs_cell(var_cell_t *cell, channel_tls_t *chan) if (! or_handshake_certs_rsa_ok(severity, chan->conn->handshake_state->certs, - chan->conn->tls)) + chan->conn->tls, + time(NULL))) ERR("Invalid RSA certificates!"); if (chan->conn->handshake_state->started_here) { diff --git a/src/or/torcert.c b/src/or/torcert.c index 94382f6..b7ed7f8 100644 --- a/src/or/torcert.c +++ b/src/or/torcert.c @@ -431,7 +431,8 @@ or_handshake_certs_free(or_handshake_certs_t *certs) int or_handshake_certs_rsa_ok(int severity, or_handshake_certs_t *certs, - tor_tls_t *tls) + tor_tls_t *tls, + time_t now) { tor_x509_cert_t *link_cert = certs->link_cert; tor_x509_cert_t *auth_cert = certs->auth_cert; @@ -442,17 +443,19 @@ or_handshake_certs_rsa_ok(int severity, ERR("The certs we wanted were missing"); if (! tor_tls_cert_matches_key(tls, link_cert)) ERR("The link certificate didn't match the TLS public key"); - if (! tor_tls_cert_is_valid(severity, link_cert, id_cert, 0)) + if (! tor_tls_cert_is_valid(severity, link_cert, id_cert, now, 0)) ERR("The link certificate was not valid"); - if (! tor_tls_cert_is_valid(severity, id_cert, id_cert, 1)) + if (! tor_tls_cert_is_valid(severity, id_cert, id_cert, now, 1)) ERR("The ID certificate was not valid"); } else { if (! (id_cert && auth_cert)) ERR("The certs we wanted were missing"); - /* Remember these certificates so we can check an AUTHENTICATE cell */ - if (! tor_tls_cert_is_valid(LOG_PROTOCOL_WARN, auth_cert, id_cert, 1)) + /* Remember these certificates so we can check an AUTHENTICATE cell + * XXXX make sure we do that + */ + if (! tor_tls_cert_is_valid(LOG_PROTOCOL_WARN, auth_cert, id_cert, now, 1)) ERR("The authentication certificate was not valid"); - if (! tor_tls_cert_is_valid(LOG_PROTOCOL_WARN, id_cert, id_cert, 1)) + if (! tor_tls_cert_is_valid(LOG_PROTOCOL_WARN, id_cert, id_cert, now, 1)) ERR("The ID certificate was not valid"); } diff --git a/src/or/torcert.h b/src/or/torcert.h index 39439d9..f851b92 100644 --- a/src/or/torcert.h +++ b/src/or/torcert.h @@ -81,8 +81,8 @@ or_handshake_certs_t *or_handshake_certs_new(void); void or_handshake_certs_free(or_handshake_certs_t *certs); int or_handshake_certs_rsa_ok(int severity, or_handshake_certs_t *certs, - tor_tls_t *tls); -int or_handshake_certs_ed25519_ok(or_handshake_certs_t *certs); + tor_tls_t *tls, + time_t now); #endif diff --git a/src/test/test_tortls.c b/src/test/test_tortls.c index 8efcac2..44961c8 100644 --- a/src/test/test_tortls.c +++ b/src/test/test_tortls.c @@ -1086,13 +1086,13 @@ test_tortls_check_lifetime(void *ignored) time_t now = time(NULL); tls = tor_malloc_zero(sizeof(tor_tls_t)); - ret = tor_tls_check_lifetime(LOG_WARN, tls, 0, 0); + ret = tor_tls_check_lifetime(LOG_WARN, tls, time(NULL), 0, 0); tt_int_op(ret, OP_EQ, -1); tls->ssl = tor_malloc_zero(sizeof(SSL)); tls->ssl->session = tor_malloc_zero(sizeof(SSL_SESSION)); tls->ssl->session->peer = validCert; - ret = tor_tls_check_lifetime(LOG_WARN, tls, 0, 0); + ret = tor_tls_check_lifetime(LOG_WARN, tls, time(NULL), 0, 0); tt_int_op(ret, OP_EQ, 0); ASN1_STRING_free(validCert->cert_info->validity->notBefore); @@ -1100,10 +1100,10 @@ test_tortls_check_lifetime(void *ignored) ASN1_STRING_free(validCert->cert_info->validity->notAfter); validCert->cert_info->validity->notAfter = ASN1_TIME_set(NULL, now+60); - ret = tor_tls_check_lifetime(LOG_WARN, tls, 0, -1000); + ret = tor_tls_check_lifetime(LOG_WARN, tls, time(NULL), 0, -1000); tt_int_op(ret, OP_EQ, -1); - ret = tor_tls_check_lifetime(LOG_WARN, tls, -1000, 0); + ret = tor_tls_check_lifetime(LOG_WARN, tls, time(NULL), -1000, 0); tt_int_op(ret, OP_EQ, -1); done: @@ -2653,18 +2653,18 @@ test_tortls_cert_is_valid(void *ignored) tor_x509_cert_t *cert = NULL, *scert = NULL; scert = tor_malloc_zero(sizeof(tor_x509_cert_t)); - ret = tor_tls_cert_is_valid(LOG_WARN, cert, scert, 0); + ret = tor_tls_cert_is_valid(LOG_WARN, cert, scert, time(NULL), 0); tt_int_op(ret, OP_EQ, 0); cert = tor_malloc_zero(sizeof(tor_x509_cert_t)); - ret = tor_tls_cert_is_valid(LOG_WARN, cert, scert, 0); + ret = tor_tls_cert_is_valid(LOG_WARN, cert, scert, time(NULL), 0); tt_int_op(ret, OP_EQ, 0); tor_free(scert); tor_free(cert); cert = tor_x509_cert_new(read_cert_from(validCertString)); scert = tor_x509_cert_new(read_cert_from(caCertString)); - ret = tor_tls_cert_is_valid(LOG_WARN, cert, scert, 0); + ret = tor_tls_cert_is_valid(LOG_WARN, cert, scert, time(NULL), 0); tt_int_op(ret, OP_EQ, 1); #ifndef OPENSSL_OPAQUE @@ -2675,7 +2675,7 @@ test_tortls_cert_is_valid(void *ignored) ASN1_TIME_free(cert->cert->cert_info->validity->notAfter); cert->cert->cert_info->validity->notAfter = ASN1_TIME_set(NULL, time(NULL)-1000000); - ret = tor_tls_cert_is_valid(LOG_WARN, cert, scert, 0); + ret = tor_tls_cert_is_valid(LOG_WARN, cert, scert, time(NULL), 0); tt_int_op(ret, OP_EQ, 0); tor_x509_cert_free(cert); @@ -2684,7 +2684,7 @@ test_tortls_cert_is_valid(void *ignored) scert = tor_x509_cert_new(read_cert_from(caCertString)); X509_PUBKEY_free(cert->cert->cert_info->key); cert->cert->cert_info->key = NULL; - ret = tor_tls_cert_is_valid(LOG_WARN, cert, scert, 1); + ret = tor_tls_cert_is_valid(LOG_WARN, cert, scert, time(NULL), 1); tt_int_op(ret, OP_EQ, 0); #endif @@ -2695,7 +2695,7 @@ test_tortls_cert_is_valid(void *ignored) scert = tor_x509_cert_new(read_cert_from(caCertString)); /* This doesn't actually change the key in the cert. XXXXXX */ BN_one(EVP_PKEY_get1_RSA(X509_get_pubkey(cert->cert))->n); - ret = tor_tls_cert_is_valid(LOG_WARN, cert, scert, 1); + ret = tor_tls_cert_is_valid(LOG_WARN, cert, scert, time(NULL), 1); tt_int_op(ret, OP_EQ, 0); tor_x509_cert_free(cert); @@ -2704,7 +2704,7 @@ test_tortls_cert_is_valid(void *ignored) scert = tor_x509_cert_new(read_cert_from(caCertString)); /* This doesn't actually change the key in the cert. XXXXXX */ X509_get_pubkey(cert->cert)->type = EVP_PKEY_EC; - ret = tor_tls_cert_is_valid(LOG_WARN, cert, scert, 1); + ret = tor_tls_cert_is_valid(LOG_WARN, cert, scert, time(NULL), 1); tt_int_op(ret, OP_EQ, 0); tor_x509_cert_free(cert); @@ -2713,7 +2713,7 @@ test_tortls_cert_is_valid(void *ignored) scert = tor_x509_cert_new(read_cert_from(caCertString)); /* This doesn't actually change the key in the cert. XXXXXX */ X509_get_pubkey(cert->cert)->type = EVP_PKEY_EC; - ret = tor_tls_cert_is_valid(LOG_WARN, cert, scert, 0); + ret = tor_tls_cert_is_valid(LOG_WARN, cert, scert, time(NULL), 0); tt_int_op(ret, OP_EQ, 1); tor_x509_cert_free(cert); @@ -2723,7 +2723,7 @@ test_tortls_cert_is_valid(void *ignored) /* This doesn't actually change the key in the cert. XXXXXX */ X509_get_pubkey(cert->cert)->type = EVP_PKEY_EC; X509_get_pubkey(cert->cert)->ameth = NULL; - ret = tor_tls_cert_is_valid(LOG_WARN, cert, scert, 0); + ret = tor_tls_cert_is_valid(LOG_WARN, cert, scert, time(NULL), 0); tt_int_op(ret, OP_EQ, 0); #endif

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[tor/master] Refactor ...compute_authenticate_cell_body() to return a var_cell_t.
by nickm＠torproject.org 03 Nov '16

03 Nov '16

commit 4ef42e7c529a95b69d3e830e115e5d0453d38dfb Author: Nick Mathewson <nickm(a)torproject.org> Date: Tue May 19 13:10:01 2015 -0400 Refactor ...compute_authenticate_cell_body() to return a var_cell_t. This means we don't need to precompute the length. Helps simplify the implementation of 19156. --- src/or/channeltls.c | 33 +++++++++++++++++++++------- src/or/connection_or.c | 59 ++++++++++++++++++++++++-------------------------- src/or/connection_or.h | 3 +-- 3 files changed, 54 insertions(+), 41 deletions(-) diff --git a/src/or/channeltls.c b/src/or/channeltls.c index 8009c0b..9e92aad 100644 --- a/src/or/channeltls.c +++ b/src/or/channeltls.c @@ -2112,9 +2112,11 @@ channel_tls_process_auth_challenge_cell(var_cell_t *cell, channel_tls_t *chan) STATIC void channel_tls_process_authenticate_cell(var_cell_t *cell, channel_tls_t *chan) { - uint8_t expected[V3_AUTH_FIXED_PART_LEN+256]; + var_cell_t *expected_cell = NULL; const uint8_t *auth; int authlen; + const int authtype = 1; /* XXXX extend this */ + int bodylen; tor_assert(cell); tor_assert(chan); @@ -2127,6 +2129,7 @@ channel_tls_process_authenticate_cell(var_cell_t *cell, channel_tls_t *chan) safe_str(chan->conn->base_.address), \ chan->conn->base_.port, (s)); \ connection_or_close_for_error(chan->conn, 0); \ + var_cell_free(expected_cell); \ return; \ } while (0) @@ -2158,7 +2161,7 @@ channel_tls_process_authenticate_cell(var_cell_t *cell, channel_tls_t *chan) if (4 + len > cell->payload_len) ERR("Authenticator was truncated"); - if (type != AUTHTYPE_RSA_SHA256_TLSSECRET) + if (type != authtype) ERR("Authenticator type was not recognized"); auth += 4; @@ -2168,14 +2171,26 @@ channel_tls_process_authenticate_cell(var_cell_t *cell, channel_tls_t *chan) if (authlen < V3_AUTH_BODY_LEN + 1) ERR("Authenticator was too short"); - ssize_t bodylen = - connection_or_compute_authenticate_cell_body( - chan->conn, expected, sizeof(expected), - AUTHTYPE_RSA_SHA256_TLSSECRET, NULL, NULL, 1); - if (bodylen < 0 || bodylen != V3_AUTH_FIXED_PART_LEN) + expected_cell = connection_or_compute_authenticate_cell_body( + chan->conn, authtype, NULL, NULL, 1); + if (! expected_cell) ERR("Couldn't compute expected AUTHENTICATE cell body"); - if (tor_memneq(expected, auth, bodylen)) + if (authtype == AUTHTYPE_RSA_SHA256_TLSSECRET || + authtype == AUTHTYPE_RSA_SHA256_RFC5705) { + bodylen = V3_AUTH_BODY_LEN; + } else { + bodylen = authlen - ED25519_SIG_LEN; /* XXXX DOCDOC */ + } + if (expected_cell->payload_len != bodylen+4) { + ERR("Expected AUTHENTICATE cell body len not as expected."); + } + + /* Length of random part. */ + if (bodylen < 24) + ERR("Bodylen is somehow less than 24, which should really be impossible"); + + if (tor_memneq(expected_cell->payload+4, auth, bodylen-24)) ERR("Some field in the AUTHENTICATE cell body was not as expected"); { @@ -2246,6 +2261,8 @@ channel_tls_process_authenticate_cell(var_cell_t *cell, channel_tls_t *chan) chan->conn->base_.port); } + var_cell_free(expected_cell); + #undef ERR } diff --git a/src/or/connection_or.c b/src/or/connection_or.c index fed933b..ed91595 100644 --- a/src/or/connection_or.c +++ b/src/or/connection_or.c @@ -2292,8 +2292,8 @@ connection_or_send_auth_challenge_cell(or_connection_t *conn) } /** Compute the main body of an AUTHENTICATE cell that a client can use - * to authenticate itself on a v3 handshake for conn. Write it to the - * outlen-byte buffer at out. + * to authenticate itself on a v3 handshake for conn. Return it + * in a var_cell_t. * * If server is true, only calculate the first * V3_AUTH_FIXED_PART_LEN bytes -- the part of the authenticator that's @@ -2309,9 +2309,8 @@ connection_or_send_auth_challenge_cell(or_connection_t *conn) * * Return the length of the cell body on success, and -1 on failure. */ -int +var_cell_t * connection_or_compute_authenticate_cell_body(or_connection_t *conn, - uint8_t *out, size_t outlen, const int authtype, crypto_pk_t *signing_key, ed25519_keypair_t *ed_signing_key, @@ -2319,7 +2318,7 @@ connection_or_compute_authenticate_cell_body(or_connection_t *conn, { auth1_t *auth = NULL; auth_ctx_t *ctx = auth_ctx_new(); - int result; + var_cell_t *result = NULL; int old_tlssecrets_algorithm = 0; const char *authtype_str = NULL; @@ -2444,7 +2443,22 @@ connection_or_compute_authenticate_cell_body(or_connection_t *conn, * checks it. That's followed by 16 bytes of nonce. */ crypto_rand((char*)auth->rand, 24); + ssize_t maxlen = auth1_encoded_len(auth, ctx); + if (ed_signing_key && is_ed) { + maxlen += ED25519_SIG_LEN; + } else if (signing_key && !is_ed) { + maxlen += crypto_pk_keysize(signing_key); + } + + const int AUTH_CELL_HEADER_LEN = 4; /* 2 bytes of type, 2 bytes of length */ + result = var_cell_new(AUTH_CELL_HEADER_LEN + maxlen); + uint8_t *const out = result->payload + AUTH_CELL_HEADER_LEN; + const size_t outlen = maxlen; ssize_t len; + + result->command = CELL_AUTHENTICATE; + set_uint16(result->payload, htons(authtype)); + if ((len = auth1_encode(out, outlen, auth, ctx)) < 0) { log_warn(LD_OR, "Unable to encode signed part of AUTH1 data."); goto err; @@ -2457,7 +2471,8 @@ connection_or_compute_authenticate_cell_body(or_connection_t *conn, log_warn(LD_OR, "Unable to parse signed part of AUTH1 data."); goto err; } - result = (int) (tmp->end_of_fixed_part - out); + result->payload_len = (tmp->end_of_signed - result->payload); + auth1_free(tmp); if (len2 != len) { log_warn(LD_OR, "Mismatched length when re-parsing AUTH1 data."); @@ -2488,7 +2503,6 @@ connection_or_compute_authenticate_cell_body(or_connection_t *conn, } auth1_setlen_sig(auth, siglen); - } len = auth1_encode(out, outlen, auth, ctx); @@ -2496,12 +2510,15 @@ connection_or_compute_authenticate_cell_body(or_connection_t *conn, log_warn(LD_OR, "Unable to encode signed AUTH1 data."); goto err; } + tor_assert(len + AUTH_CELL_HEADER_LEN <= result->payload_len); + result->payload_len = len + AUTH_CELL_HEADER_LEN; + set_uint16(result->payload+2, htons(len)); - result = (int) len; goto done; err: - result = -1; + var_cell_free(result); + result = NULL; done: auth1_free(auth); auth_ctx_free(ctx); @@ -2515,8 +2532,6 @@ connection_or_send_authenticate_cell,(or_connection_t *conn, int authtype)) { var_cell_t *cell; crypto_pk_t *pk = tor_tls_get_my_client_auth_key(); - int authlen; - size_t cell_maxlen; /* XXXX make sure we're actually supposed to send this! */ if (!pk) { @@ -2529,33 +2544,15 @@ connection_or_send_authenticate_cell,(or_connection_t *conn, int authtype)) return -1; } - /* XXXX stop precomputing this. */ - cell_maxlen = 4 + /* overhead */ - V3_AUTH_BODY_LEN + /* Authentication body */ - crypto_pk_keysize(pk) + /* Max signature length */ - 16 /* add a few extra bytes just in case. */; - - cell = var_cell_new(cell_maxlen); - cell->command = CELL_AUTHENTICATE; - set_uint16(cell->payload, htons(AUTHTYPE_RSA_SHA256_TLSSECRET)); - /* skip over length ; we don't know that yet. */ - - authlen = connection_or_compute_authenticate_cell_body(conn, - cell->payload+4, - cell_maxlen-4, + cell = connection_or_compute_authenticate_cell_body(conn, AUTHTYPE_RSA_SHA256_TLSSECRET, pk, NULL, 0 /* not server */); - if (authlen < 0) { + if (! cell) { log_warn(LD_BUG, "Unable to compute authenticate cell!"); - var_cell_free(cell); return -1; } - tor_assert(authlen + 4 <= cell->payload_len); - set_uint16(cell->payload+2, htons(authlen)); - cell->payload_len = authlen + 4; - connection_or_write_var_cell_to_buf(cell, conn); var_cell_free(cell); diff --git a/src/or/connection_or.h b/src/or/connection_or.h index 8373ed9..65a8ac1 100644 --- a/src/or/connection_or.h +++ b/src/or/connection_or.h @@ -84,8 +84,7 @@ int connection_or_send_versions(or_connection_t *conn, int v3_plus); MOCK_DECL(int,connection_or_send_netinfo,(or_connection_t *conn)); int connection_or_send_certs_cell(or_connection_t *conn); int connection_or_send_auth_challenge_cell(or_connection_t *conn); -int connection_or_compute_authenticate_cell_body(or_connection_t *conn, - uint8_t *out, size_t outlen, +var_cell_t *connection_or_compute_authenticate_cell_body(or_connection_t *conn, const int authtype, crypto_pk_t *signing_key, ed25519_keypair_t *ed_signing_key,

1 0

[tor/master] Send ed25519 certificates in certs cell, when we have them.
by nickm＠torproject.org 03 Nov '16

03 Nov '16

commit fdd8f8df67be92b5e3058afcad68a1e267442b77 Author: Nick Mathewson <nickm(a)torproject.org> Date: Thu Mar 5 12:01:19 2015 +0100 Send ed25519 certificates in certs cell, when we have them. Implements 19155 (send CERTS cells correctly for Ed25519) Also send RSA->Ed crosscert --- src/or/connection_or.c | 114 ++++++++++++++++++++++++++++++++++++++++--------- 1 file changed, 93 insertions(+), 21 deletions(-) diff --git a/src/or/connection_or.c b/src/or/connection_or.c index fc60e61..09579f8 100644 --- a/src/or/connection_or.c +++ b/src/or/connection_or.c @@ -38,9 +38,11 @@ #include "relay.h" #include "rephist.h" #include "router.h" +#include "routerkeys.h" #include "routerlist.h" #include "ext_orport.h" #include "scheduler.h" +#include "torcert.h" static int connection_tls_finish_handshake(or_connection_t *conn); static int connection_or_launch_v3_or_handshake(or_connection_t *conn); @@ -2121,14 +2123,56 @@ connection_or_send_netinfo,(or_connection_t *conn)) return 0; } +/** Add an encoded X509 cert (stored as cert_len bytes at + * cert_encoded) to the trunnel certs_cell_t object that we are + * building in certs_cell. Set its type field to cert_type. */ +static void +add_x509_cert(certs_cell_t *certs_cell, + uint8_t cert_type, + const tor_x509_cert_t *cert) +{ + const uint8_t *cert_encoded = NULL; + size_t cert_len; + tor_x509_cert_get_der(cert, &cert_encoded, &cert_len); + tor_assert(cert_len <= UINT16_MAX); + + certs_cell_cert_t *ccc = certs_cell_cert_new(); + ccc->cert_type = cert_type; + ccc->cert_len = cert_len; + certs_cell_cert_setlen_body(ccc, cert_len); + memcpy(certs_cell_cert_getarray_body(ccc), cert_encoded, cert_len); + + certs_cell_add_certs(certs_cell, ccc); +} + +/** Add an Ed25519 cert from cert to the trunnel certs_cell_t object + * that we are building in certs_cell. Set its type field to + * cert_type. */ +static void +add_ed25519_cert(certs_cell_t *certs_cell, + uint8_t cert_type, + const tor_cert_t *cert) +{ + if (NULL == cert) + return; + + certs_cell_cert_t *ccc = certs_cell_cert_new(); + ccc->cert_type = cert_type; + tor_assert(cert->encoded_len <= UINT16_MAX); + ccc->cert_len = cert->encoded_len; + certs_cell_cert_setlen_body(ccc, cert->encoded_len); + memcpy(certs_cell_cert_getarray_body(ccc), cert->encoded, + cert->encoded_len); + + certs_cell_add_certs(certs_cell, ccc); +} + /** Send a CERTS cell on the connection conn. Return 0 on success, -1 * on failure. */ int connection_or_send_certs_cell(or_connection_t *conn) { const tor_x509_cert_t *link_cert = NULL, *id_cert = NULL; - const uint8_t *link_encoded = NULL, *id_encoded = NULL; - size_t link_len, id_len; var_cell_t *cell; certs_cell_t *certs_cell = NULL; @@ -2137,34 +2181,62 @@ connection_or_send_certs_cell(or_connection_t *conn) if (! conn->handshake_state) return -1; + const int conn_in_server_mode = ! conn->handshake_state->started_here; + + /* Get the encoded values of the X509 certificates */ if (tor_tls_get_my_certs(conn_in_server_mode, &link_cert, &id_cert) < 0) return -1; - certs_cell = certs_cell_new(); - - tor_x509_cert_get_der(link_cert, &link_encoded, &link_len); - tor_x509_cert_get_der(id_cert, &id_encoded, &id_len); + tor_assert(link_cert); + tor_assert(id_cert); - certs_cell_cert_t *ccc = certs_cell_cert_new(); - if (conn_in_server_mode) - ccc->cert_type = OR_CERT_TYPE_TLS_LINK; /* Link cert */ - else - ccc->cert_type = OR_CERT_TYPE_AUTH_1024; /* client authentication */ - ccc->cert_len = link_len; - certs_cell_cert_setlen_body(ccc, link_len); - memcpy(certs_cell_cert_getarray_body(ccc), link_encoded, link_len); + certs_cell = certs_cell_new(); - certs_cell_add_certs(certs_cell, ccc); + /* Start adding certs. First the link cert or auth1024 cert. */ + if (conn_in_server_mode) { + add_x509_cert(certs_cell, + OR_CERT_TYPE_TLS_LINK, link_cert); + } else { + add_x509_cert(certs_cell, + OR_CERT_TYPE_AUTH_1024, link_cert); + } - ccc = certs_cell_cert_new(); - ccc->cert_type = OR_CERT_TYPE_ID_1024; /* ID cert */ - ccc->cert_len = id_len; - certs_cell_cert_setlen_body(ccc, id_len); - memcpy(certs_cell_cert_getarray_body(ccc), id_encoded, id_len); + /* Next the RSA->RSA ID cert */ + add_x509_cert(certs_cell, + OR_CERT_TYPE_ID_1024, id_cert); + + /* Next the Ed25519 certs */ + add_ed25519_cert(certs_cell, + CERTTYPE_ED_ID_SIGN, + get_master_signing_key_cert()); + if (conn_in_server_mode) { + add_ed25519_cert(certs_cell, + CERTTYPE_ED_SIGN_LINK, + get_current_link_cert_cert()); + } else { + add_ed25519_cert(certs_cell, + CERTTYPE_ED_SIGN_AUTH, + get_current_auth_key_cert()); + } - certs_cell_add_certs(certs_cell, ccc); + /* And finally the crosscert. */ + { + const uint8_t *crosscert=NULL; + size_t crosscert_len; + get_master_rsa_crosscert(&crosscert, &crosscert_len); + if (crosscert) { + certs_cell_cert_t *ccc = certs_cell_cert_new(); + ccc->cert_type = CERTTYPE_RSA1024_ID_EDID; + ccc->cert_len = crosscert_len; + certs_cell_cert_setlen_body(ccc, crosscert_len); + memcpy(certs_cell_cert_getarray_body(ccc), crosscert, + crosscert_len); + certs_cell_add_certs(certs_cell, ccc); + } + } + /* We've added all the certs; make the cell. */ certs_cell->n_certs = certs_cell_getlen_certs(certs_cell); ssize_t alloc_len = certs_cell_encoded_len(certs_cell);

1 0

[tor/master] Fix a misfeature with the Ed cert expiration API
by nickm＠torproject.org 03 Nov '16

03 Nov '16

commit fae7060aea5c562fc59e7089b6a3459a5718b2d0 Author: Nick Mathewson <nickm(a)torproject.org> Date: Tue Aug 30 08:48:50 2016 -0400 Fix a misfeature with the Ed cert expiration API The batch-verification helper didn't expose the expiration time, which made it pretty error-prone. This closes ticket 15087. --- src/or/routerparse.c | 12 +++++------- src/or/torcert.c | 23 +++++++++++++++++------ src/or/torcert.h | 5 +++-- 3 files changed, 25 insertions(+), 15 deletions(-) diff --git a/src/or/routerparse.c b/src/or/routerparse.c index 03f8f4e..686ac48 100644 --- a/src/or/routerparse.c +++ b/src/or/routerparse.c @@ -2028,12 +2028,13 @@ router_parse_entry_from_string(const char *s, const char *end, ed25519_checkable_t check[3]; int check_ok[3]; - if (tor_cert_get_checkable_sig(&check[0], cert, NULL) < 0) { + time_t expires = TIME_MAX; + if (tor_cert_get_checkable_sig(&check[0], cert, NULL, &expires) < 0) { log_err(LD_BUG, "Couldn't create 'checkable' for cert."); goto err; } if (tor_cert_get_checkable_sig(&check[1], - ntor_cc_cert, &ntor_cc_pk) < 0) { + ntor_cc_cert, &ntor_cc_pk, &expires) < 0) { log_err(LD_BUG, "Couldn't create 'checkable' for ntor_cc_cert."); goto err; } @@ -2063,10 +2064,7 @@ router_parse_entry_from_string(const char *s, const char *end, } /* We check this before adding it to the routerlist. */ - if (cert->valid_until < ntor_cc_cert->valid_until) - router->cert_expiration_time = cert->valid_until; - else - router->cert_expiration_time = ntor_cc_cert->valid_until; + router->cert_expiration_time = expires; } } @@ -2376,7 +2374,7 @@ extrainfo_parse_entry_from_string(const char *s, const char *end, ed25519_checkable_t check[2]; int check_ok[2]; - if (tor_cert_get_checkable_sig(&check[0], cert, NULL) < 0) { + if (tor_cert_get_checkable_sig(&check[0], cert, NULL, NULL) < 0) { log_err(LD_BUG, "Couldn't create 'checkable' for cert."); goto err; } diff --git a/src/or/torcert.c b/src/or/torcert.c index b7ed7f8..2629155 100644 --- a/src/or/torcert.c +++ b/src/or/torcert.c @@ -166,11 +166,17 @@ tor_cert_parse(const uint8_t *encoded, const size_t len) } /** Fill in checkable_out with the information needed to check - * the signature on cert with pubkey. */ + * the signature on cert with pubkey. + * + * On success, if expiration_out is provided, and it is some time + * _after_ the expiration time of this certificate, set it to the + * expiration time of this certificate. + */ int tor_cert_get_checkable_sig(ed25519_checkable_t *checkable_out, const tor_cert_t *cert, - const ed25519_public_key_t *pubkey) + const ed25519_public_key_t *pubkey, + time_t *expiration_out) { if (! pubkey) { if (cert->signing_key_included) @@ -187,6 +193,10 @@ tor_cert_get_checkable_sig(ed25519_checkable_t *checkable_out, memcpy(checkable_out->signature.sig, cert->encoded + signed_len, ED25519_SIG_LEN); + if (expiration_out) { + *expiration_out = MIN(*expiration_out, cert->valid_until); + } + return 0; } @@ -201,14 +211,15 @@ tor_cert_checksig(tor_cert_t *cert, { ed25519_checkable_t checkable; int okay; + time_t expires = TIME_MAX; - if (now && now > cert->valid_until) { - cert->cert_expired = 1; + if (tor_cert_get_checkable_sig(&checkable, cert, pubkey, &expires) < 0) return -1; - } - if (tor_cert_get_checkable_sig(&checkable, cert, pubkey) < 0) + if (now && now > expires) { + cert->cert_expired = 1; return -1; + } if (ed25519_checksig_batch(&okay, &checkable, 1) < 0) { cert->sig_bad = 1; diff --git a/src/or/torcert.h b/src/or/torcert.h index f851b92..143a2aa 100644 --- a/src/or/torcert.h +++ b/src/or/torcert.h @@ -57,8 +57,9 @@ tor_cert_t *tor_cert_parse(const uint8_t *cert, size_t certlen); void tor_cert_free(tor_cert_t *cert); int tor_cert_get_checkable_sig(ed25519_checkable_t *checkable_out, - const tor_cert_t *out, - const ed25519_public_key_t *pubkey); + const tor_cert_t *out, + const ed25519_public_key_t *pubkey, + time_t *expiration_out); int tor_cert_checksig(tor_cert_t *cert, const ed25519_public_key_t *pubkey, time_t now);

1 0

[tor/master] Code to send correct authentication data when we are using AUTHTYPE>2
by nickm＠torproject.org 03 Nov '16

03 Nov '16

commit 2bf655394942e5b76944df92c8cd002fc15d3382 Author: Nick Mathewson <nickm(a)torproject.org> Date: Sat May 16 12:09:25 2015 -0400 Code to send correct authentication data when we are using AUTHTYPE>2 Implements the major part of 19156, except doesn't actually send the new cell type yet. --- src/or/channeltls.c | 3 ++- src/or/connection_or.c | 42 +++++++++++++++++++++++++++++++++++------- src/or/connection_or.h | 8 +++++--- src/or/or.h | 2 ++ 4 files changed, 44 insertions(+), 11 deletions(-) diff --git a/src/or/channeltls.c b/src/or/channeltls.c index e30ecb0..8009c0b 100644 --- a/src/or/channeltls.c +++ b/src/or/channeltls.c @@ -2170,7 +2170,8 @@ channel_tls_process_authenticate_cell(var_cell_t *cell, channel_tls_t *chan) ssize_t bodylen = connection_or_compute_authenticate_cell_body( - chan->conn, expected, sizeof(expected), NULL, 1); + chan->conn, expected, sizeof(expected), + AUTHTYPE_RSA_SHA256_TLSSECRET, NULL, NULL, 1); if (bodylen < 0 || bodylen != V3_AUTH_FIXED_PART_LEN) ERR("Couldn't compute expected AUTHENTICATE cell body"); diff --git a/src/or/connection_or.c b/src/or/connection_or.c index d06a246..fed933b 100644 --- a/src/or/connection_or.c +++ b/src/or/connection_or.c @@ -2312,7 +2312,9 @@ connection_or_send_auth_challenge_cell(or_connection_t *conn) int connection_or_compute_authenticate_cell_body(or_connection_t *conn, uint8_t *out, size_t outlen, + const int authtype, crypto_pk_t *signing_key, + ed25519_keypair_t *ed_signing_key, int server) { auth1_t *auth = NULL; @@ -2322,7 +2324,6 @@ connection_or_compute_authenticate_cell_body(or_connection_t *conn, const char *authtype_str = NULL; int is_ed = 0; - const int authtype = 1; /* XXXX this should be an argument. */ /* assert state is reasonable XXXX */ switch (authtype) { @@ -2343,6 +2344,7 @@ connection_or_compute_authenticate_cell_body(or_connection_t *conn, } auth = auth1_new(); + ctx->is_ed = is_ed; /* Type: 8 bytes. */ memcpy(auth1_getarray_type(auth), authtype_str, 8); @@ -2371,6 +2373,20 @@ connection_or_compute_authenticate_cell_body(or_connection_t *conn, memcpy(auth->sid, server_id, 32); } + if (is_ed) { + const ed25519_public_key_t *my_ed_id, *their_ed_id; + if (!conn->handshake_state->ed_id_sign_cert) + goto err; + my_ed_id = get_master_identity_key(); + their_ed_id = &conn->handshake_state->ed_id_sign_cert->signing_key; + + const uint8_t *cid_ed = (server ? their_ed_id : my_ed_id)->pubkey; + const uint8_t *sid_ed = (server ? my_ed_id : their_ed_id)->pubkey; + + memcpy(auth->u1_cid_ed, cid_ed, ED25519_PUBKEY_LEN); + memcpy(auth->u1_sid_ed, sid_ed, ED25519_PUBKEY_LEN); + } + { crypto_digest_t *server_d, *client_d; if (server) { @@ -2450,7 +2466,14 @@ connection_or_compute_authenticate_cell_body(or_connection_t *conn, goto done; } - if (signing_key) { + if (ed_signing_key && is_ed) { + ed25519_signature_t sig; + if (ed25519_sign(&sig, out, len, ed_signing_key) < 0) + goto err; + auth1_setlen_sig(auth, ED25519_SIG_LEN); + memcpy(auth1_getarray_sig(auth), sig.sig, ED25519_SIG_LEN); + + } else if (signing_key && !is_ed) { auth1_setlen_sig(auth, crypto_pk_keysize(signing_key)); char d[32]; @@ -2466,12 +2489,14 @@ connection_or_compute_authenticate_cell_body(or_connection_t *conn, auth1_setlen_sig(auth, siglen); - len = auth1_encode(out, outlen, auth, ctx); - if (len < 0) { - log_warn(LD_OR, "Unable to encode signed AUTH1 data."); - goto err; - } } + + len = auth1_encode(out, outlen, auth, ctx); + if (len < 0) { + log_warn(LD_OR, "Unable to encode signed AUTH1 data."); + goto err; + } + result = (int) len; goto done; @@ -2504,6 +2529,7 @@ connection_or_send_authenticate_cell,(or_connection_t *conn, int authtype)) return -1; } + /* XXXX stop precomputing this. */ cell_maxlen = 4 + /* overhead */ V3_AUTH_BODY_LEN + /* Authentication body */ crypto_pk_keysize(pk) + /* Max signature length */ @@ -2517,7 +2543,9 @@ connection_or_send_authenticate_cell,(or_connection_t *conn, int authtype)) authlen = connection_or_compute_authenticate_cell_body(conn, cell->payload+4, cell_maxlen-4, + AUTHTYPE_RSA_SHA256_TLSSECRET, pk, + NULL, 0 /* not server */); if (authlen < 0) { log_warn(LD_BUG, "Unable to compute authenticate cell!"); diff --git a/src/or/connection_or.h b/src/or/connection_or.h index 2e8c606..8373ed9 100644 --- a/src/or/connection_or.h +++ b/src/or/connection_or.h @@ -85,9 +85,11 @@ MOCK_DECL(int,connection_or_send_netinfo,(or_connection_t *conn)); int connection_or_send_certs_cell(or_connection_t *conn); int connection_or_send_auth_challenge_cell(or_connection_t *conn); int connection_or_compute_authenticate_cell_body(or_connection_t *conn, - uint8_t *out, size_t outlen, - crypto_pk_t *signing_key, - int server); + uint8_t *out, size_t outlen, + const int authtype, + crypto_pk_t *signing_key, + ed25519_keypair_t *ed_signing_key, + int server); MOCK_DECL(int,connection_or_send_authenticate_cell, (or_connection_t *conn, int type)); diff --git a/src/or/or.h b/src/or/or.h index 402fbfd..9e9b1bf 100644 --- a/src/or/or.h +++ b/src/or/or.h @@ -1445,6 +1445,8 @@ typedef struct or_handshake_state_t { tor_x509_cert_t *auth_cert; /** A self-signed identity certificate */ tor_x509_cert_t *id_cert; + /** DOCDOC */ + struct tor_cert_st *ed_id_sign_cert; /**@}*/ } or_handshake_state_t;

1 0

[tor/master] Add function to check RSA->Ed cross-certifications
by nickm＠torproject.org 03 Nov '16

03 Nov '16

commit e3c825372180be00aff9c8e5cde60ea36d141f8c Author: Nick Mathewson <nickm(a)torproject.org> Date: Wed Aug 10 14:19:09 2016 -0400 Add function to check RSA->Ed cross-certifications Also, adjust signing approach to more closely match the signing scheme in the proposal. (The format doesn't quite match the format in the proposal, since RSA signatures aren't fixed-length.) Closes 19020. --- src/or/torcert.c | 105 ++++++++++++++++++++++++++++++++++++++++++++- src/or/torcert.h | 5 +++ src/test/test_routerkeys.c | 62 ++++++++++++++++++++++++++ 3 files changed, 171 insertions(+), 1 deletion(-) diff --git a/src/or/torcert.c b/src/or/torcert.c index 2f0cc53..94382f6 100644 --- a/src/or/torcert.c +++ b/src/or/torcert.c @@ -257,6 +257,8 @@ tor_cert_opt_eq(const tor_cert_t *cert1, const tor_cert_t *cert2) return tor_cert_eq(cert1, cert2); } +#define RSA_ED_CROSSCERT_PREFIX "Tor TLS RSA/Ed25519 cross-certificate" + /** Create new cross-certification object to certify ed_key as the * master ed25519 identity key for the RSA identity key rsa_key. * Allocates and stores the encoded certificate in *cert, and returns @@ -281,11 +283,21 @@ tor_make_rsa_ed25519_crosscert(const ed25519_public_key_t *ed_key, ssize_t sz = rsa_ed_crosscert_encode(res, alloc_sz, cc); tor_assert(sz > 0 && sz <= alloc_sz); + crypto_digest_t *d = crypto_digest256_new(DIGEST_SHA256); + crypto_digest_add_bytes(d, RSA_ED_CROSSCERT_PREFIX, + strlen(RSA_ED_CROSSCERT_PREFIX)); + const int signed_part_len = 32 + 4; + crypto_digest_add_bytes(d, (char*)res, signed_part_len); + + uint8_t digest[DIGEST256_LEN]; + crypto_digest_get_digest(d, (char*)digest, sizeof(digest)); + crypto_digest_free(d); + int siglen = crypto_pk_private_sign(rsa_key, (char*)rsa_ed_crosscert_getarray_sig(cc), rsa_ed_crosscert_getlen_sig(cc), - (char*)res, signed_part_len); + (char*)digest, sizeof(digest)); tor_assert(siglen > 0 && siglen <= (int)crypto_pk_keysize(rsa_key)); tor_assert(siglen <= UINT8_MAX); cc->sig_len = siglen; @@ -297,6 +309,96 @@ tor_make_rsa_ed25519_crosscert(const ed25519_public_key_t *ed_key, return sz; } +/** + * Check whether the crosscert_len byte certificate in crosscert + * is in fact a correct cross-certification of master_key using + * the RSA key rsa_id_key. + * + * Also reject the certificate if it expired before + * reject_if_expired_before. + * + * Return 0 on success, negative on failure. + */ +int +rsa_ed25519_crosscert_check(const uint8_t *crosscert, + const size_t crosscert_len, + const crypto_pk_t *rsa_id_key, + const ed25519_public_key_t *master_key, + const time_t reject_if_expired_before) +{ + rsa_ed_crosscert_t *cc = NULL; + int rv; + +#define ERR(code, s) \ + do { \ + log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL, \ + "Received a bad RSA->Ed25519 crosscert: %s", \ + (s)); \ + rv = (code); \ + goto err; \ + } while (0) + + if (BUG(crypto_pk_keysize(rsa_id_key) > PK_BYTES)) + return -1; + + if (BUG(!crosscert)) + return -1; + + ssize_t parsed_len = rsa_ed_crosscert_parse(&cc, crosscert, crosscert_len); + if (parsed_len < 0 || crosscert_len != (size_t)parsed_len) { + ERR(-2, "Unparseable or overlong crosscert"); + } + + if (tor_memneq(rsa_ed_crosscert_getarray_ed_key(cc), + master_key->pubkey, + ED25519_PUBKEY_LEN)) { + ERR(-3, "Crosscert did not match Ed25519 key"); + } + + const uint32_t expiration_date = rsa_ed_crosscert_get_expiration(cc); + const uint64_t expiration_time = expiration_date * 3600; + + if (reject_if_expired_before < 0 || + expiration_time < (uint64_t)reject_if_expired_before) { + ERR(-4, "Crosscert is expired"); + } + + const uint8_t *eos = rsa_ed_crosscert_get_end_of_signed(cc); + const uint8_t *sig = rsa_ed_crosscert_getarray_sig(cc); + const uint8_t siglen = rsa_ed_crosscert_get_sig_len(cc); + tor_assert(eos >= crosscert); + tor_assert((size_t)(eos - crosscert) <= crosscert_len); + tor_assert(siglen == rsa_ed_crosscert_getlen_sig(cc)); + + /* Compute the digest */ + uint8_t digest[DIGEST256_LEN]; + crypto_digest_t *d = crypto_digest256_new(DIGEST_SHA256); + crypto_digest_add_bytes(d, RSA_ED_CROSSCERT_PREFIX, + strlen(RSA_ED_CROSSCERT_PREFIX)); + crypto_digest_add_bytes(d, (char*)crosscert, eos-crosscert); + crypto_digest_get_digest(d, (char*)digest, sizeof(digest)); + crypto_digest_free(d); + + /* Now check the signature */ + uint8_t signed_[PK_BYTES]; + int signed_len = crypto_pk_public_checksig(rsa_id_key, + (char*)signed_, sizeof(signed_), + (char*)sig, siglen); + if (signed_len < DIGEST256_LEN) { + ERR(-5, "Bad signature, or length of signed data not as expected"); + } + + if (tor_memneq(digest, signed_, DIGEST256_LEN)) { + ERR(-6, "The signature was good, but it didn't match the data"); + } + + rv = 0; + err: + rsa_ed_crosscert_free(cc); + return rv; +} + +/** Construct and return a new empty or_handshake_certs object */ or_handshake_certs_t * or_handshake_certs_new(void) { @@ -317,6 +419,7 @@ or_handshake_certs_free(or_handshake_certs_t *certs) tor_free(certs); } +#undef ERR #define ERR(s) \ do { \ log_fn(severity, LD_PROTOCOL, \ diff --git a/src/or/torcert.h b/src/or/torcert.h index 0420b41..39439d9 100644 --- a/src/or/torcert.h +++ b/src/or/torcert.h @@ -71,6 +71,11 @@ ssize_t tor_make_rsa_ed25519_crosscert(const ed25519_public_key_t *ed_key, const crypto_pk_t *rsa_key, time_t expires, uint8_t **cert); +int rsa_ed25519_crosscert_check(const uint8_t *crosscert, + const size_t crosscert_len, + const crypto_pk_t *rsa_id_key, + const ed25519_public_key_t *master_key, + const time_t reject_if_expired_before); or_handshake_certs_t *or_handshake_certs_new(void); void or_handshake_certs_free(or_handshake_certs_t *certs); diff --git a/src/test/test_routerkeys.c b/src/test/test_routerkeys.c index 24b0da1..56055a3 100644 --- a/src/test/test_routerkeys.c +++ b/src/test/test_routerkeys.c @@ -614,6 +614,67 @@ test_routerkeys_cross_certify_tap(void *args) crypto_pk_free(onion_key); } + +static void +test_routerkeys_rsa_ed_crosscert(void *arg) +{ + (void)arg; + ed25519_public_key_t ed; + crypto_pk_t *rsa = pk_generate(2); + + uint8_t *cc = NULL; + ssize_t cc_len; + time_t expires_in = 1470846177; + + tt_int_op(0, OP_EQ, ed25519_public_from_base64(&ed, + "ThisStringCanContainAnythingSoNoKeyHereNowX")); + cc_len = tor_make_rsa_ed25519_crosscert(&ed, rsa, expires_in, &cc); + + tt_int_op(cc_len, OP_GT, 0); + tt_int_op(cc_len, OP_GT, 37); /* key, expires, siglen */ + tt_mem_op(cc, OP_EQ, ed.pubkey, 32); + time_t expires_out = 3600 * ntohl(get_uint32(cc+32)); + tt_int_op(expires_out, OP_GE, expires_in); + tt_int_op(expires_out, OP_LE, expires_in + 3600); + + tt_int_op(cc_len, OP_EQ, 37 + get_uint8(cc+36)); + + tt_int_op(0, OP_EQ, rsa_ed25519_crosscert_check(cc, cc_len, rsa, &ed, + expires_in - 10)); + + /* Now try after it has expired */ + tt_int_op(-4, OP_EQ, rsa_ed25519_crosscert_check(cc, cc_len, rsa, &ed, + expires_out + 1)); + + /* Truncated object */ + tt_int_op(-2, OP_EQ, rsa_ed25519_crosscert_check(cc, cc_len - 2, rsa, &ed, + expires_in - 10)); + + /* Key not as expected */ + cc[0] ^= 3; + tt_int_op(-3, OP_EQ, rsa_ed25519_crosscert_check(cc, cc_len, rsa, &ed, + expires_in - 10)); + cc[0] ^= 3; + + /* Bad signature */ + cc[40] ^= 3; + tt_int_op(-5, OP_EQ, rsa_ed25519_crosscert_check(cc, cc_len, rsa, &ed, + expires_in - 10)); + cc[40] ^= 3; + + /* Signature of wrong data */ + cc[0] ^= 3; + ed.pubkey[0] ^= 3; + tt_int_op(-6, OP_EQ, rsa_ed25519_crosscert_check(cc, cc_len, rsa, &ed, + expires_in - 10)); + cc[0] ^= 3; + ed.pubkey[0] ^= 3; + + done: + crypto_pk_free(rsa); + tor_free(cc); +} + #define TEST(name, flags) \ { #name , test_routerkeys_ ## name, (flags), NULL, NULL } @@ -626,6 +687,7 @@ struct testcase_t routerkeys_tests[] = { TEST(ed_keys_init_all, TT_FORK), TEST(cross_certify_ntor, 0), TEST(cross_certify_tap, 0), + TEST(rsa_ed_crosscert, 0), END_OF_TESTCASES };

1 0

[tor/master] Handle u32 overflow in ed25519 cert expiration time.
by nickm＠torproject.org 03 Nov '16

03 Nov '16

commit 0704fa8a63c2e203162c359e184e63b10c45630c Author: Nick Mathewson <nickm(a)torproject.org> Date: Tue Aug 30 09:00:34 2016 -0400 Handle u32 overflow in ed25519 cert expiration time. The impact here isn't too bad. First, the only affected certs that expire after 32-bit signed time overflows in Y2038. Second, it could only make it seem that a non-expired cert is expired: it could never make it seem that an expired cert was still live. Fixes bug 20027; bugfix on 0.2.7.2-alpha. --- changes/bug20027 | 3 +++ src/or/torcert.c | 6 +++++- 2 files changed, 8 insertions(+), 1 deletion(-) diff --git a/changes/bug20027 b/changes/bug20027 new file mode 100644 index 0000000..79d1540 --- /dev/null +++ b/changes/bug20027 @@ -0,0 +1,3 @@ + o Minor bugfixes (ed25519 certificates): + - Correctly interpret ed25519 certificates that would expire some + time after 19 Jan 2038. Fixes bug 20027; bugfix on 0.2.7.2-alpha. diff --git a/src/or/torcert.c b/src/or/torcert.c index 2629155..ef7775e 100644 --- a/src/or/torcert.c +++ b/src/or/torcert.c @@ -139,7 +139,11 @@ tor_cert_parse(const uint8_t *encoded, const size_t len) cert->encoded_len = len; memcpy(cert->signed_key.pubkey, parsed->certified_key, 32); - cert->valid_until = parsed->exp_field * 3600; + const int64_t valid_until_64 = ((int64_t)parsed->exp_field) * 3600; + if (valid_until_64 > TIME_MAX) + cert->valid_until = TIME_MAX - 1; + else + cert->valid_until = (time_t) valid_until_64; cert->cert_type = parsed->cert_type; for (unsigned i = 0; i < ed25519_cert_getlen_ext(parsed); ++i) {

1 0

[tor/master] Refactor connection_or_send_certs_cell() to use trunnel
by nickm＠torproject.org 03 Nov '16

03 Nov '16

commit 5205e95275266e1ceafc95ff608bff872a55ab81 Author: Nick Mathewson <nickm(a)torproject.org> Date: Thu Mar 5 11:29:19 2015 +0100 Refactor connection_or_send_certs_cell() to use trunnel We no longer generate certs cells by pasting the certs together one by one. Instead we use trunnel to generate them. Preliminary work for 19155 (send CERTS cell with ed certs) --- src/or/connection_or.c | 50 ++++++++++++++++++++++++++++++-------------------- 1 file changed, 30 insertions(+), 20 deletions(-) diff --git a/src/or/connection_or.c b/src/or/connection_or.c index 72d8e13..fc60e61 100644 --- a/src/or/connection_or.c +++ b/src/or/connection_or.c @@ -2130,8 +2130,8 @@ connection_or_send_certs_cell(or_connection_t *conn) const uint8_t *link_encoded = NULL, *id_encoded = NULL; size_t link_len, id_len; var_cell_t *cell; - size_t cell_len; - ssize_t pos; + + certs_cell_t *certs_cell = NULL; tor_assert(conn->base_.state == OR_CONN_STATE_OR_HANDSHAKING_V3); @@ -2140,34 +2140,44 @@ connection_or_send_certs_cell(or_connection_t *conn) const int conn_in_server_mode = ! conn->handshake_state->started_here; if (tor_tls_get_my_certs(conn_in_server_mode, &link_cert, &id_cert) < 0) return -1; + + certs_cell = certs_cell_new(); + tor_x509_cert_get_der(link_cert, &link_encoded, &link_len); tor_x509_cert_get_der(id_cert, &id_encoded, &id_len); - cell_len = 1 /* 1 byte: num certs in cell */ + - 2 * ( 1 + 2 ) /* For each cert: 1 byte for type, 2 for length */ + - link_len + id_len; - cell = var_cell_new(cell_len); - cell->command = CELL_CERTS; - cell->payload[0] = 2; - pos = 1; - + certs_cell_cert_t *ccc = certs_cell_cert_new(); if (conn_in_server_mode) - cell->payload[pos] = OR_CERT_TYPE_TLS_LINK; /* Link cert */ + ccc->cert_type = OR_CERT_TYPE_TLS_LINK; /* Link cert */ else - cell->payload[pos] = OR_CERT_TYPE_AUTH_1024; /* client authentication */ - set_uint16(&cell->payload[pos+1], htons(link_len)); - memcpy(&cell->payload[pos+3], link_encoded, link_len); - pos += 3 + link_len; + ccc->cert_type = OR_CERT_TYPE_AUTH_1024; /* client authentication */ + ccc->cert_len = link_len; + certs_cell_cert_setlen_body(ccc, link_len); + memcpy(certs_cell_cert_getarray_body(ccc), link_encoded, link_len); - cell->payload[pos] = OR_CERT_TYPE_ID_1024; /* ID cert */ - set_uint16(&cell->payload[pos+1], htons(id_len)); - memcpy(&cell->payload[pos+3], id_encoded, id_len); - pos += 3 + id_len; + certs_cell_add_certs(certs_cell, ccc); - tor_assert(pos == (int)cell_len); /* Otherwise we just smashed the heap */ + ccc = certs_cell_cert_new(); + ccc->cert_type = OR_CERT_TYPE_ID_1024; /* ID cert */ + ccc->cert_len = id_len; + certs_cell_cert_setlen_body(ccc, id_len); + memcpy(certs_cell_cert_getarray_body(ccc), id_encoded, id_len); + + certs_cell_add_certs(certs_cell, ccc); + + certs_cell->n_certs = certs_cell_getlen_certs(certs_cell); + + ssize_t alloc_len = certs_cell_encoded_len(certs_cell); + tor_assert(alloc_len >= 0 && alloc_len <= UINT16_MAX); + cell = var_cell_new(alloc_len); + cell->command = CELL_CERTS; + ssize_t enc_len = certs_cell_encode(cell->payload, alloc_len, certs_cell); + tor_assert(enc_len > 0 && enc_len <= alloc_len); + cell->payload_len = enc_len; connection_or_write_var_cell_to_buf(cell, conn); var_cell_free(cell); + certs_cell_free(certs_cell); return 0; }

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tor-commits November 2016