mirror of
https://gitlab.torproject.org/tpo/core/tor.git
synced 2024-11-10 13:13:44 +01:00
Merge branch 'maint-0.4.1' into maint-0.4.2
This commit is contained in:
commit
85141a3a74
8
changes/ticket33119
Normal file
8
changes/ticket33119
Normal file
@ -0,0 +1,8 @@
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o Major bugfixes (security, denial-of-service):
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- Fix a denial-of-service bug that could be used by anyone to consume a
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bunch of CPU on any Tor relay or authority, or by directories to
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consume a bunch of CPU on clients or hidden services. Because
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of the potential for CPU consumption to introduce observable
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timing patterns, we are treating this as a high-severity security
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issue. Fixes bug 33119; bugfix on 0.2.1.5-alpha. We are also tracking
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this issue as TROVE-2020-002.
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@ -403,12 +403,19 @@ get_next_token(memarea_t *area,
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}
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if (!strcmp(tok->object_type, "RSA PUBLIC KEY")) { /* If it's a public key */
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if (o_syn != NEED_KEY && o_syn != NEED_KEY_1024 && o_syn != OBJ_OK) {
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RET_ERR("Unexpected public key.");
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}
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tok->key = crypto_pk_asn1_decode(tok->object_body, tok->object_size);
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if (! tok->key)
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RET_ERR("Couldn't parse public key.");
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} else if (!strcmp(tok->object_type, "RSA PRIVATE KEY")) { /* private key */
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if (o_syn != NEED_SKEY_1024 && o_syn != OBJ_OK) {
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RET_ERR("Unexpected private key.");
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}
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tok->key = crypto_pk_asn1_decode_private(tok->object_body,
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tok->object_size);
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tok->object_size,
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1024);
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if (! tok->key)
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RET_ERR("Couldn't parse private key.");
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}
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@ -490,7 +490,7 @@ crypto_pk_write_private_key_to_string(crypto_pk_t *env,
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static int
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crypto_pk_read_from_string_generic(crypto_pk_t *env, const char *src,
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size_t len, int severity,
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bool private_key)
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bool private_key, int max_bits)
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{
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if (len == (size_t)-1) // "-1" indicates "use the length of the string."
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len = strlen(src);
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@ -510,7 +510,7 @@ crypto_pk_read_from_string_generic(crypto_pk_t *env, const char *src,
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}
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crypto_pk_t *pk = private_key
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? crypto_pk_asn1_decode_private((const char*)buf, n)
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? crypto_pk_asn1_decode_private((const char*)buf, n, max_bits)
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: crypto_pk_asn1_decode((const char*)buf, n);
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if (! pk) {
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log_fn(severity, LD_CRYPTO,
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@ -539,7 +539,8 @@ int
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crypto_pk_read_public_key_from_string(crypto_pk_t *env,
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const char *src, size_t len)
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{
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return crypto_pk_read_from_string_generic(env, src, len, LOG_INFO, false);
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return crypto_pk_read_from_string_generic(env, src, len, LOG_INFO, false,
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-1);
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}
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/** Read a PEM-encoded private key from the <b>len</b>-byte string <b>src</b>
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@ -550,7 +551,21 @@ int
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crypto_pk_read_private_key_from_string(crypto_pk_t *env,
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const char *src, ssize_t len)
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{
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return crypto_pk_read_from_string_generic(env, src, len, LOG_INFO, true);
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return crypto_pk_read_from_string_generic(env, src, len, LOG_INFO, true,
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-1);
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}
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/**
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* As crypto_pk_read_private_key_from_string(), but reject any key
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* with a modulus longer than 1024 bits before doing any expensive
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* validation on it.
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*/
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int
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crypto_pk_read_private_key1024_from_string(crypto_pk_t *env,
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const char *src, ssize_t len)
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{
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return crypto_pk_read_from_string_generic(env, src, len, LOG_INFO, true,
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1024);
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}
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/** If a file is longer than this, we won't try to decode its private key */
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@ -578,7 +593,7 @@ crypto_pk_read_private_key_from_filename(crypto_pk_t *env,
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}
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int rv = crypto_pk_read_from_string_generic(env, buf, (ssize_t)st.st_size,
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LOG_WARN, true);
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LOG_WARN, true, -1);
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if (rv < 0) {
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log_warn(LD_CRYPTO, "Unable to decode private key from file %s",
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escaped(keyfile));
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@ -662,7 +677,7 @@ crypto_pk_base64_decode_private(const char *str, size_t len)
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goto out;
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}
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pk = crypto_pk_asn1_decode_private(der, der_len);
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pk = crypto_pk_asn1_decode_private(der, der_len, -1);
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out:
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memwipe(der, 0, len+1);
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@ -61,6 +61,8 @@ int crypto_pk_read_public_key_from_string(crypto_pk_t *env,
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const char *src, size_t len);
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int crypto_pk_read_private_key_from_string(crypto_pk_t *env,
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const char *s, ssize_t len);
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int crypto_pk_read_private_key1024_from_string(crypto_pk_t *env,
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const char *src, ssize_t len);
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int crypto_pk_write_private_key_to_filename(crypto_pk_t *env,
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const char *fname);
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@ -95,7 +97,8 @@ int crypto_pk_asn1_encode(const crypto_pk_t *pk, char *dest, size_t dest_len);
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crypto_pk_t *crypto_pk_asn1_decode(const char *str, size_t len);
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int crypto_pk_asn1_encode_private(const crypto_pk_t *pk,
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char *dest, size_t dest_len);
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crypto_pk_t *crypto_pk_asn1_decode_private(const char *str, size_t len);
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crypto_pk_t *crypto_pk_asn1_decode_private(const char *str, size_t len,
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int max_bits);
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int crypto_pk_get_fingerprint(crypto_pk_t *pk, char *fp_out,int add_space);
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int crypto_pk_get_hashed_fingerprint(crypto_pk_t *pk, char *fp_out);
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void crypto_add_spaces_to_fp(char *out, size_t outlen, const char *in);
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@ -679,9 +679,12 @@ crypto_pk_asn1_encode_private(const crypto_pk_t *pk,
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/** Given a buffer containing the DER representation of the
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* private key <b>str</b>, decode and return the result on success, or NULL
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* on failure.
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*
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* If <b>max_bits</b> is nonnegative, reject any key longer than max_bits
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* without performing any expensive validation on it.
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*/
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crypto_pk_t *
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crypto_pk_asn1_decode_private(const char *str, size_t len)
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crypto_pk_asn1_decode_private(const char *str, size_t len, int max_bits)
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{
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tor_assert(str);
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tor_assert(len < INT_MAX);
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@ -731,6 +734,15 @@ crypto_pk_asn1_decode_private(const char *str, size_t len)
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output = NULL;
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}
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if (output) {
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const int bits = SECKEY_PublicKeyStrengthInBits(output->pubkey);
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if (max_bits >= 0 && bits > max_bits) {
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log_info(LD_CRYPTO, "Private key longer than expected.");
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crypto_pk_free(output);
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output = NULL;
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}
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}
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if (slot)
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PK11_FreeSlot(slot);
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@ -33,6 +33,7 @@ ENABLE_GCC_WARNING(redundant-decls)
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#include "lib/encoding/binascii.h"
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#include <string.h>
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#include <stdbool.h>
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/** Declaration for crypto_pk_t structure. */
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struct crypto_pk_t
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@ -564,11 +565,64 @@ crypto_pk_asn1_encode_private(const crypto_pk_t *pk, char *dest,
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return len;
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}
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/** Check whether any component of a private key is too large in a way that
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* seems likely to make verification too expensive. Return true if it's too
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* long, and false otherwise. */
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static bool
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rsa_private_key_too_long(RSA *rsa, int max_bits)
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{
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const BIGNUM *n, *e, *p, *q, *d, *dmp1, *dmq1, *iqmp;
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#ifdef OPENSSL_1_1_API
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n = RSA_get0_n(rsa);
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e = RSA_get0_e(rsa);
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p = RSA_get0_p(rsa);
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q = RSA_get0_q(rsa);
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d = RSA_get0_d(rsa);
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dmp1 = RSA_get0_dmp1(rsa);
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dmq1 = RSA_get0_dmq1(rsa);
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iqmp = RSA_get0_iqmp(rsa);
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if (RSA_bits(rsa) > max_bits)
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return true;
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#else
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n = rsa->n;
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e = rsa->e;
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p = rsa->p;
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q = rsa->q;
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d = rsa->d;
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dmp1 = rsa->dmp1;
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dmq1 = rsa->dmq1;
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iqmp = rsa->iqmp;
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#endif
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if (n && BN_num_bits(n) > max_bits)
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return true;
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if (e && BN_num_bits(e) > max_bits)
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return true;
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if (p && BN_num_bits(p) > max_bits)
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return true;
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if (q && BN_num_bits(q) > max_bits)
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return true;
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if (d && BN_num_bits(d) > max_bits)
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return true;
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if (dmp1 && BN_num_bits(dmp1) > max_bits)
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return true;
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if (dmq1 && BN_num_bits(dmq1) > max_bits)
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return true;
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if (iqmp && BN_num_bits(iqmp) > max_bits)
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return true;
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return false;
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}
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/** Decode an ASN.1-encoded private key from <b>str</b>; return the result on
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* success and NULL on failure.
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*
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* If <b>max_bits</b> is nonnegative, reject any key longer than max_bits
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* without performing any expensive validation on it.
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*/
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crypto_pk_t *
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crypto_pk_asn1_decode_private(const char *str, size_t len)
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crypto_pk_asn1_decode_private(const char *str, size_t len, int max_bits)
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{
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RSA *rsa;
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unsigned char *buf;
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@ -578,7 +632,12 @@ crypto_pk_asn1_decode_private(const char *str, size_t len)
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rsa = d2i_RSAPrivateKey(NULL, &cp, len);
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tor_free(buf);
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if (!rsa) {
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crypto_openssl_log_errors(LOG_WARN,"decoding public key");
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crypto_openssl_log_errors(LOG_WARN,"decoding private key");
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return NULL;
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}
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if (max_bits >= 0 && rsa_private_key_too_long(rsa, max_bits)) {
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log_info(LD_CRYPTO, "Private key longer than expected.");
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RSA_free(rsa);
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return NULL;
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}
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crypto_pk_t *result = crypto_new_pk_from_openssl_rsa_(rsa);
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@ -1335,6 +1335,44 @@ test_crypto_pk_pem_encrypted(void *arg)
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crypto_pk_free(pk);
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}
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static void
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test_crypto_pk_bad_size(void *arg)
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{
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(void)arg;
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crypto_pk_t *pk1 = pk_generate(0);
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crypto_pk_t *pk2 = NULL;
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char buf[2048];
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int n = crypto_pk_asn1_encode_private(pk1, buf, sizeof(buf));
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tt_int_op(n, OP_GT, 0);
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/* Set the max bit count smaller: we should refuse to decode the key.*/
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pk2 = crypto_pk_asn1_decode_private(buf, n, 1020);
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tt_assert(! pk2);
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/* Set the max bit count one bit smaller: we should refuse to decode the
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key.*/
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pk2 = crypto_pk_asn1_decode_private(buf, n, 1023);
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tt_assert(! pk2);
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/* Correct size: should work. */
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pk2 = crypto_pk_asn1_decode_private(buf, n, 1024);
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tt_assert(pk2);
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crypto_pk_free(pk2);
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/* One bit larger: should work. */
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pk2 = crypto_pk_asn1_decode_private(buf, n, 1025);
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tt_assert(pk2);
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crypto_pk_free(pk2);
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/* Set the max bit count larger: it should decode fine. */
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pk2 = crypto_pk_asn1_decode_private(buf, n, 2048);
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tt_assert(pk2);
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done:
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crypto_pk_free(pk1);
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crypto_pk_free(pk2);
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}
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static void
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test_crypto_pk_invalid_private_key(void *arg)
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{
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@ -2998,6 +3036,7 @@ struct testcase_t crypto_tests[] = {
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{ "pk_fingerprints", test_crypto_pk_fingerprints, TT_FORK, NULL, NULL },
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{ "pk_base64", test_crypto_pk_base64, TT_FORK, NULL, NULL },
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{ "pk_pem_encrypted", test_crypto_pk_pem_encrypted, TT_FORK, NULL, NULL },
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{ "pk_bad_size", test_crypto_pk_bad_size, 0, NULL, NULL },
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{ "pk_invalid_private_key", test_crypto_pk_invalid_private_key, 0,
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NULL, NULL },
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CRYPTO_LEGACY(digests),
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