diff options
Diffstat (limited to 'debian/patches/0022-Fix-crash-in-pk11_numbits-when-native-pkcs11-is-used.patch')
| -rw-r--r-- | debian/patches/0022-Fix-crash-in-pk11_numbits-when-native-pkcs11-is-used.patch | 400 |
1 files changed, 400 insertions, 0 deletions
diff --git a/debian/patches/0022-Fix-crash-in-pk11_numbits-when-native-pkcs11-is-used.patch b/debian/patches/0022-Fix-crash-in-pk11_numbits-when-native-pkcs11-is-used.patch new file mode 100644 index 0000000..b321616 --- /dev/null +++ b/debian/patches/0022-Fix-crash-in-pk11_numbits-when-native-pkcs11-is-used.patch @@ -0,0 +1,400 @@ +From: =?utf-8?b?T25kxZllaiBTdXLDvQ==?= <ondrej@isc.org> +Date: Tue, 21 Jul 2020 14:42:47 +0200 +Subject: Fix crash in pk11_numbits() when native-pkcs11 is used + +origin: https://gitlab.isc.org/isc-projects/bind9/commit/8d807cc21655eaa6e6a08afafeec3682c0f3f2ab +Bug-Debian-Security: https://security-tracker.debian.org/tracker/CVE-2020-8623 + +When pk11_numbits() is passed a user provided input that contains all +zeroes (via crafted DNS message), it would crash with assertion +failure. Fix that by properly handling such input. + +[Salvatore Bonaccorso: Backport to 99.11.5.P4 which does not contain +9d15323e2484 ("Add small tweaks to the code to fix compilation when ISC +assertions are disabled")] +--- + lib/dns/pkcs11dh_link.c | 15 ++++++-- + lib/dns/pkcs11dsa_link.c | 8 ++++- + lib/dns/pkcs11rsa_link.c | 79 +++++++++++++++++++++++++++++++---------- + lib/isc/include/pk11/internal.h | 3 +- + lib/isc/pk11.c | 60 ++++++++++++++++++++----------- + 5 files changed, 121 insertions(+), 44 deletions(-) + +diff --git a/lib/dns/pkcs11dh_link.c b/lib/dns/pkcs11dh_link.c +index e2b60ea..4cd8e32 100644 +--- a/lib/dns/pkcs11dh_link.c ++++ b/lib/dns/pkcs11dh_link.c +@@ -748,6 +748,7 @@ pkcs11dh_fromdns(dst_key_t *key, isc_buffer_t *data) { + CK_BYTE *prime = NULL, *base = NULL, *pub = NULL; + CK_ATTRIBUTE *attr; + int special = 0; ++ unsigned int bits; + isc_result_t result; + + isc_buffer_remainingregion(data, &r); +@@ -852,7 +853,11 @@ pkcs11dh_fromdns(dst_key_t *key, isc_buffer_t *data) { + pub = r.base; + isc_region_consume(&r, publen); + +- key->key_size = pk11_numbits(prime, plen_); ++ result = pk11_numbits(prime, plen_, &bits); ++ if (result != ISC_R_SUCCESS) { ++ goto cleanup; ++ } ++ key->key_size = bits; + + dh->repr = (CK_ATTRIBUTE *) isc_mem_get(key->mctx, sizeof(*attr) * 3); + if (dh->repr == NULL) +@@ -1012,6 +1017,7 @@ pkcs11dh_parse(dst_key_t *key, isc_lex_t *lexer, dst_key_t *pub) { + dst_private_t priv; + isc_result_t ret; + int i; ++ unsigned int bits; + pk11_object_t *dh = NULL; + CK_ATTRIBUTE *attr; + isc_mem_t *mctx; +@@ -1082,7 +1088,12 @@ pkcs11dh_parse(dst_key_t *key, isc_lex_t *lexer, dst_key_t *pub) { + + attr = pk11_attribute_bytype(dh, CKA_PRIME); + INSIST(attr != NULL); +- key->key_size = pk11_numbits(attr->pValue, attr->ulValueLen); ++ ++ ret = pk11_numbits(attr->pValue, attr->ulValueLen, &bits); ++ if (ret != ISC_R_SUCCESS) { ++ goto err; ++ } ++ key->key_size = bits; + + return (ISC_R_SUCCESS); + +diff --git a/lib/dns/pkcs11dsa_link.c b/lib/dns/pkcs11dsa_link.c +index 12d707a..24d4c14 100644 +--- a/lib/dns/pkcs11dsa_link.c ++++ b/lib/dns/pkcs11dsa_link.c +@@ -983,6 +983,7 @@ pkcs11dsa_parse(dst_key_t *key, isc_lex_t *lexer, dst_key_t *pub) { + dst_private_t priv; + isc_result_t ret; + int i; ++ unsigned int bits; + pk11_object_t *dsa = NULL; + CK_ATTRIBUTE *attr; + isc_mem_t *mctx = key->mctx; +@@ -1072,7 +1073,12 @@ pkcs11dsa_parse(dst_key_t *key, isc_lex_t *lexer, dst_key_t *pub) { + + attr = pk11_attribute_bytype(dsa, CKA_PRIME); + INSIST(attr != NULL); +- key->key_size = pk11_numbits(attr->pValue, attr->ulValueLen); ++ ++ ret = pk11_numbits(attr->pValue, attr->ulValueLen, &bits); ++ if (ret != ISC_R_SUCCESS) { ++ goto err; ++ } ++ key->key_size = bits; + + return (ISC_R_SUCCESS); + +diff --git a/lib/dns/pkcs11rsa_link.c b/lib/dns/pkcs11rsa_link.c +index eb782c8..57ee41d 100644 +--- a/lib/dns/pkcs11rsa_link.c ++++ b/lib/dns/pkcs11rsa_link.c +@@ -330,6 +330,7 @@ pkcs11rsa_createctx_verify(dst_key_t *key, unsigned int maxbits, + key->key_alg == DST_ALG_RSASHA256 || + key->key_alg == DST_ALG_RSASHA512); + #endif ++ REQUIRE(maxbits <= RSA_MAX_PUBEXP_BITS); + + /* + * Reject incorrect RSA key lengths. +@@ -373,6 +374,7 @@ pkcs11rsa_createctx_verify(dst_key_t *key, unsigned int maxbits, + for (attr = pk11_attribute_first(rsa); + attr != NULL; + attr = pk11_attribute_next(rsa, attr)) ++ { + switch (attr->type) { + case CKA_MODULUS: + INSIST(keyTemplate[5].type == attr->type); +@@ -393,12 +395,16 @@ pkcs11rsa_createctx_verify(dst_key_t *key, unsigned int maxbits, + memmove(keyTemplate[6].pValue, attr->pValue, + attr->ulValueLen); + keyTemplate[6].ulValueLen = attr->ulValueLen; +- if (pk11_numbits(attr->pValue, +- attr->ulValueLen) > maxbits && +- maxbits != 0) ++ unsigned int bits; ++ ret = pk11_numbits(attr->pValue, attr->ulValueLen, ++ &bits); ++ if (ret != ISC_R_SUCCESS || ++ (bits > maxbits && maxbits != 0)) { + DST_RET(DST_R_VERIFYFAILURE); ++ } + break; + } ++ } + pk11_ctx->object = CK_INVALID_HANDLE; + pk11_ctx->ontoken = false; + PK11_RET(pkcs_C_CreateObject, +@@ -1063,6 +1069,7 @@ pkcs11rsa_verify(dst_context_t *dctx, const isc_region_t *sig) { + keyTemplate[5].ulValueLen = attr->ulValueLen; + break; + case CKA_PUBLIC_EXPONENT: ++ unsigned int bits; + INSIST(keyTemplate[6].type == attr->type); + keyTemplate[6].pValue = isc_mem_get(dctx->mctx, + attr->ulValueLen); +@@ -1071,10 +1078,12 @@ pkcs11rsa_verify(dst_context_t *dctx, const isc_region_t *sig) { + memmove(keyTemplate[6].pValue, attr->pValue, + attr->ulValueLen); + keyTemplate[6].ulValueLen = attr->ulValueLen; +- if (pk11_numbits(attr->pValue, +- attr->ulValueLen) +- > RSA_MAX_PUBEXP_BITS) ++ ret = pk11_numbits(attr->pValue, attr->ulValueLen, ++ &bits); ++ if (ret != ISC_R_SUCCESS || bits > RSA_MAX_PUBEXP_BITS) ++ { + DST_RET(DST_R_VERIFYFAILURE); ++ } + break; + } + pk11_ctx->object = CK_INVALID_HANDLE; +@@ -1451,6 +1460,8 @@ pkcs11rsa_fromdns(dst_key_t *key, isc_buffer_t *data) { + CK_BYTE *exponent = NULL, *modulus = NULL; + CK_ATTRIBUTE *attr; + unsigned int length; ++ unsigned int bits; ++ isc_result_t ret = ISC_R_SUCCESS; + + isc_buffer_remainingregion(data, &r); + if (r.length == 0) +@@ -1468,9 +1479,7 @@ pkcs11rsa_fromdns(dst_key_t *key, isc_buffer_t *data) { + + if (e_bytes == 0) { + if (r.length < 2) { +- isc_safe_memwipe(rsa, sizeof(*rsa)); +- isc_mem_put(key->mctx, rsa, sizeof(*rsa)); +- return (DST_R_INVALIDPUBLICKEY); ++ DST_RET(DST_R_INVALIDPUBLICKEY); + } + e_bytes = (*r.base) << 8; + isc_region_consume(&r, 1); +@@ -1479,16 +1488,18 @@ pkcs11rsa_fromdns(dst_key_t *key, isc_buffer_t *data) { + } + + if (r.length < e_bytes) { +- isc_safe_memwipe(rsa, sizeof(*rsa)); +- isc_mem_put(key->mctx, rsa, sizeof(*rsa)); +- return (DST_R_INVALIDPUBLICKEY); ++ DST_RET(DST_R_INVALIDPUBLICKEY); + } + exponent = r.base; + isc_region_consume(&r, e_bytes); + modulus = r.base; + mod_bytes = r.length; + +- key->key_size = pk11_numbits(modulus, mod_bytes); ++ ret = pk11_numbits(modulus, mod_bytes, &bits); ++ if (ret != ISC_R_SUCCESS) { ++ goto err; ++ } ++ key->key_size = bits; + + isc_buffer_forward(data, length); + +@@ -1538,9 +1549,12 @@ pkcs11rsa_fromdns(dst_key_t *key, isc_buffer_t *data) { + rsa->repr, + rsa->attrcnt * sizeof(*attr)); + } ++ ret = ISC_R_NOMEMORY; ++ ++ err: + isc_safe_memwipe(rsa, sizeof(*rsa)); + isc_mem_put(key->mctx, rsa, sizeof(*rsa)); +- return (ISC_R_NOMEMORY); ++ return (ret); + } + + static isc_result_t +@@ -1719,6 +1733,7 @@ pkcs11rsa_fetch(dst_key_t *key, const char *engine, const char *label, + pk11_object_t *pubrsa; + pk11_context_t *pk11_ctx = NULL; + isc_result_t ret; ++ unsigned int bits; + + if (label == NULL) + return (DST_R_NOENGINE); +@@ -1803,7 +1818,11 @@ pkcs11rsa_fetch(dst_key_t *key, const char *engine, const char *label, + + attr = pk11_attribute_bytype(rsa, CKA_MODULUS); + INSIST(attr != NULL); +- key->key_size = pk11_numbits(attr->pValue, attr->ulValueLen); ++ ret = pk11_numbits(attr->pValue, attr->ulValueLen, &bits); ++ if (ret != ISC_R_SUCCESS) { ++ goto err; ++ } ++ key->key_size = bits; + + return (ISC_R_SUCCESS); + +@@ -1889,6 +1908,7 @@ pkcs11rsa_parse(dst_key_t *key, isc_lex_t *lexer, dst_key_t *pub) { + CK_ATTRIBUTE *attr; + isc_mem_t *mctx = key->mctx; + const char *engine = NULL, *label = NULL; ++ unsigned int bits; + + /* read private key file */ + ret = dst__privstruct_parse(key, DST_ALG_RSA, lexer, mctx, &priv); +@@ -2032,12 +2052,22 @@ pkcs11rsa_parse(dst_key_t *key, isc_lex_t *lexer, dst_key_t *pub) { + + attr = pk11_attribute_bytype(rsa, CKA_MODULUS); + INSIST(attr != NULL); +- key->key_size = pk11_numbits(attr->pValue, attr->ulValueLen); ++ ret = pk11_numbits(attr->pValue, attr->ulValueLen, &bits); ++ if (ret != ISC_R_SUCCESS) { ++ goto err; ++ } ++ key->key_size = bits; + + attr = pk11_attribute_bytype(rsa, CKA_PUBLIC_EXPONENT); + INSIST(attr != NULL); +- if (pk11_numbits(attr->pValue, attr->ulValueLen) > RSA_MAX_PUBEXP_BITS) ++ ++ ret = pk11_numbits(attr->pValue, attr->ulValueLen, &bits); ++ if (ret != ISC_R_SUCCESS) { ++ goto err; ++ } ++ if (bits > RSA_MAX_PUBEXP_BITS) { + DST_RET(ISC_R_RANGE); ++ } + + dst__privstruct_free(&priv, mctx); + isc_safe_memwipe(&priv, sizeof(priv)); +@@ -2072,6 +2102,7 @@ pkcs11rsa_fromlabel(dst_key_t *key, const char *engine, const char *label, + pk11_context_t *pk11_ctx = NULL; + isc_result_t ret; + unsigned int i; ++ unsigned int bits; + + UNUSED(pin); + +@@ -2166,12 +2197,22 @@ pkcs11rsa_fromlabel(dst_key_t *key, const char *engine, const char *label, + + attr = pk11_attribute_bytype(rsa, CKA_PUBLIC_EXPONENT); + INSIST(attr != NULL); +- if (pk11_numbits(attr->pValue, attr->ulValueLen) > RSA_MAX_PUBEXP_BITS) ++ ++ ret = pk11_numbits(attr->pValue, attr->ulValueLen, &bits); ++ if (ret != ISC_R_SUCCESS) { ++ goto err; ++ } ++ if (bits > RSA_MAX_PUBEXP_BITS) { + DST_RET(ISC_R_RANGE); ++ } + + attr = pk11_attribute_bytype(rsa, CKA_MODULUS); + INSIST(attr != NULL); +- key->key_size = pk11_numbits(attr->pValue, attr->ulValueLen); ++ ret = pk11_numbits(attr->pValue, attr->ulValueLen, &bits); ++ if (ret != ISC_R_SUCCESS) { ++ goto err; ++ } ++ key->key_size = bits; + + pk11_return_session(pk11_ctx); + isc_safe_memwipe(pk11_ctx, sizeof(*pk11_ctx)); +diff --git a/lib/isc/include/pk11/internal.h b/lib/isc/include/pk11/internal.h +index aa8907a..7cc8ec8 100644 +--- a/lib/isc/include/pk11/internal.h ++++ b/lib/isc/include/pk11/internal.h +@@ -25,7 +25,8 @@ void pk11_mem_put(void *ptr, size_t size); + + CK_SLOT_ID pk11_get_best_token(pk11_optype_t optype); + +-unsigned int pk11_numbits(CK_BYTE_PTR data, unsigned int bytecnt); ++isc_result_t ++pk11_numbits(CK_BYTE_PTR data, unsigned int bytecnt, unsigned int *bits); + + CK_ATTRIBUTE *pk11_attribute_first(const pk11_object_t *obj); + +diff --git a/lib/isc/pk11.c b/lib/isc/pk11.c +index c5d2310..b2ab6be 100644 +--- a/lib/isc/pk11.c ++++ b/lib/isc/pk11.c +@@ -962,13 +962,15 @@ pk11_get_best_token(pk11_optype_t optype) { + return (token->slotid); + } + +-unsigned int +-pk11_numbits(CK_BYTE_PTR data, unsigned int bytecnt) { ++isc_result_t ++pk11_numbits(CK_BYTE_PTR data, unsigned int bytecnt, unsigned int *bits) { + unsigned int bitcnt, i; + CK_BYTE top; + +- if (bytecnt == 0) +- return (0); ++ if (bytecnt == 0) { ++ *bits = 0; ++ return (ISC_R_SUCCESS); ++ } + bitcnt = bytecnt * 8; + for (i = 0; i < bytecnt; i++) { + top = data[i]; +@@ -976,25 +978,41 @@ pk11_numbits(CK_BYTE_PTR data, unsigned int bytecnt) { + bitcnt -= 8; + continue; + } +- if (top & 0x80) +- return (bitcnt); +- if (top & 0x40) +- return (bitcnt - 1); +- if (top & 0x20) +- return (bitcnt - 2); +- if (top & 0x10) +- return (bitcnt - 3); +- if (top & 0x08) +- return (bitcnt - 4); +- if (top & 0x04) +- return (bitcnt - 5); +- if (top & 0x02) +- return (bitcnt - 6); +- if (top & 0x01) +- return (bitcnt - 7); ++ if (top & 0x80) { ++ *bits = bitcnt; ++ return (ISC_R_SUCCESS); ++ } ++ if (top & 0x40) { ++ *bits = bitcnt - 1; ++ return (ISC_R_SUCCESS); ++ } ++ if (top & 0x20) { ++ *bits = bitcnt - 2; ++ return (ISC_R_SUCCESS); ++ } ++ if (top & 0x10) { ++ *bits = bitcnt - 3; ++ return (ISC_R_SUCCESS); ++ } ++ if (top & 0x08) { ++ *bits = bitcnt - 4; ++ return (ISC_R_SUCCESS); ++ } ++ if (top & 0x04) { ++ *bits = bitcnt - 5; ++ return (ISC_R_SUCCESS); ++ } ++ if (top & 0x02) { ++ *bits = bitcnt - 6; ++ return (ISC_R_SUCCESS); ++ } ++ if (top & 0x01) { ++ *bits = bitcnt - 7; ++ return (ISC_R_SUCCESS); ++ } + break; + } +- INSIST(0); ++ return (ISC_R_RANGE); + } + + CK_ATTRIBUTE * |