diff options
author | David Howells <dhowells@redhat.com> | 2014-07-01 17:40:19 +0200 |
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committer | David Howells <dhowells@redhat.com> | 2014-07-08 14:50:08 +0200 |
commit | a4730357ee724f8c64f0292541ba3da8a95510fb (patch) | |
tree | 6fb1aa9af3515b0de6c6d5bcb85c3a44b8ba554e /crypto/asymmetric_keys | |
parent | PKCS#7: Digest the data in a signed-data message (diff) | |
download | linux-a4730357ee724f8c64f0292541ba3da8a95510fb.tar.xz linux-a4730357ee724f8c64f0292541ba3da8a95510fb.zip |
PKCS#7: Find the right key in the PKCS#7 key list and verify the signature
Find the appropriate key in the PKCS#7 key list and verify the signature with
it. There may be several keys in there forming a chain. Any link in that
chain or the root of that chain may be in our keyrings.
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Diffstat (limited to 'crypto/asymmetric_keys')
-rw-r--r-- | crypto/asymmetric_keys/pkcs7_verify.c | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/crypto/asymmetric_keys/pkcs7_verify.c b/crypto/asymmetric_keys/pkcs7_verify.c index 0bb408a5b64f..745e5c86a35e 100644 --- a/crypto/asymmetric_keys/pkcs7_verify.c +++ b/crypto/asymmetric_keys/pkcs7_verify.c @@ -120,6 +120,55 @@ error_no_desc: } /* + * Find the key (X.509 certificate) to use to verify a PKCS#7 message. PKCS#7 + * uses the issuer's name and the issuing certificate serial number for + * matching purposes. These must match the certificate issuer's name (not + * subject's name) and the certificate serial number [RFC 2315 6.7]. + */ +static int pkcs7_find_key(struct pkcs7_message *pkcs7, + struct pkcs7_signed_info *sinfo) +{ + struct x509_certificate *x509; + unsigned certix = 1; + + kenter("%u,%u,%u", + sinfo->index, sinfo->raw_serial_size, sinfo->raw_issuer_size); + + for (x509 = pkcs7->certs; x509; x509 = x509->next, certix++) { + /* I'm _assuming_ that the generator of the PKCS#7 message will + * encode the fields from the X.509 cert in the same way in the + * PKCS#7 message - but I can't be 100% sure of that. It's + * possible this will need element-by-element comparison. + */ + if (x509->raw_serial_size != sinfo->raw_serial_size || + memcmp(x509->raw_serial, sinfo->raw_serial, + sinfo->raw_serial_size) != 0) + continue; + pr_devel("Sig %u: Found cert serial match X.509[%u]\n", + sinfo->index, certix); + + if (x509->raw_issuer_size != sinfo->raw_issuer_size || + memcmp(x509->raw_issuer, sinfo->raw_issuer, + sinfo->raw_issuer_size) != 0) { + pr_warn("Sig %u: X.509 subject and PKCS#7 issuer don't match\n", + sinfo->index); + continue; + } + + if (x509->pub->pkey_algo != sinfo->sig.pkey_algo) { + pr_warn("Sig %u: X.509 algo and PKCS#7 sig algo don't match\n", + sinfo->index); + continue; + } + + sinfo->signer = x509; + return 0; + } + pr_warn("Sig %u: Issuing X.509 cert not found (#%*ph)\n", + sinfo->index, sinfo->raw_serial_size, sinfo->raw_serial); + return -ENOKEY; +} + /* * Verify one signed information block from a PKCS#7 message. */ @@ -137,6 +186,21 @@ static int pkcs7_verify_one(struct pkcs7_message *pkcs7, if (ret < 0) return ret; + /* Find the key for the signature */ + ret = pkcs7_find_key(pkcs7, sinfo); + if (ret < 0) + return ret; + + pr_devel("Using X.509[%u] for sig %u\n", + sinfo->signer->index, sinfo->index); + + /* Verify the PKCS#7 binary against the key */ + ret = public_key_verify_signature(sinfo->signer->pub, &sinfo->sig); + if (ret < 0) + return ret; + + pr_devel("Verified signature %u\n", sinfo->index); + return 0; } |