diff options
Diffstat (limited to 'lib/crypto')
| -rw-r--r-- | lib/crypto/pkcs7_verify.c | 61 |
1 files changed, 54 insertions, 7 deletions
diff --git a/lib/crypto/pkcs7_verify.c b/lib/crypto/pkcs7_verify.c index 706358f09b..320ba49f79 100644 --- a/lib/crypto/pkcs7_verify.c +++ b/lib/crypto/pkcs7_verify.c @@ -301,10 +301,27 @@ static int pkcs7_find_key(struct pkcs7_message *pkcs7, } /* - * Verify the internal certificate chain as best we can. + * pkcs7_verify_sig_chain - Verify the internal certificate chain as best + * as we can. + * @pkcs7: PKCS7 Signed Data + * @sinfo: PKCS7 Signed Info + * @signer: Singer's certificate + * + * Build up and verify the internal certificate chain against a signature + * in @sinfo, using certificates contained in @pkcs7 as best as we can. + * If the chain reaches the end, the last certificate will be returned + * in @signer. + * + * Return: 0 - on success, non-zero error code - otherwise */ +#ifdef __UBOOT__ +static int pkcs7_verify_sig_chain(struct pkcs7_message *pkcs7, + struct pkcs7_signed_info *sinfo, + struct x509_certificate **signer) +#else static int pkcs7_verify_sig_chain(struct pkcs7_message *pkcs7, struct pkcs7_signed_info *sinfo) +#endif { struct public_key_signature *sig; struct x509_certificate *x509 = sinfo->signer, *p; @@ -313,6 +330,8 @@ static int pkcs7_verify_sig_chain(struct pkcs7_message *pkcs7, kenter(""); + *signer = NULL; + for (p = pkcs7->certs; p; p = p->next) p->seen = false; @@ -330,6 +349,9 @@ static int pkcs7_verify_sig_chain(struct pkcs7_message *pkcs7, for (p = sinfo->signer; p != x509; p = p->signer) p->blacklisted = true; pr_debug("- blacklisted\n"); +#ifdef __UBOOT__ + *signer = x509; +#endif return 0; } @@ -355,6 +377,9 @@ static int pkcs7_verify_sig_chain(struct pkcs7_message *pkcs7, goto unsupported_crypto_in_x509; x509->signer = x509; pr_debug("- self-signed\n"); +#ifdef __UBOOT__ + *signer = x509; +#endif return 0; } @@ -385,6 +410,9 @@ static int pkcs7_verify_sig_chain(struct pkcs7_message *pkcs7, /* We didn't find the root of this chain */ pr_debug("- top\n"); +#ifdef __UBOOT__ + *signer = x509; +#endif return 0; found_issuer_check_skid: @@ -402,6 +430,9 @@ static int pkcs7_verify_sig_chain(struct pkcs7_message *pkcs7, if (p->seen) { pr_warn("Sig %u: X.509 chain contains loop\n", sinfo->index); +#ifdef __UBOOT__ + *signer = p; +#endif return 0; } ret = public_key_verify_signature(p->pub, x509->sig); @@ -410,6 +441,9 @@ static int pkcs7_verify_sig_chain(struct pkcs7_message *pkcs7, x509->signer = p; if (x509 == p) { pr_debug("- self-signed\n"); +#ifdef __UBOOT__ + *signer = p; +#endif return 0; } x509 = p; @@ -429,13 +463,26 @@ unsupported_crypto_in_x509: } /* - * Verify one signed information block from a PKCS#7 message. + * pkcs7_verify_one - Verify one signed information block from a PKCS#7 + * message. + * @pkcs7: PKCS7 Signed Data + * @sinfo: PKCS7 Signed Info + * @signer: Signer's certificate + * + * Verify one signature in @sinfo and follow the certificate chain. + * If the chain reaches the end, the last certificate will be returned + * in @signer. + * + * Return: 0 - on success, non-zero error code - otherwise */ -#ifndef __UBOOT__ -static -#endif +#ifdef __UBOOT__ int pkcs7_verify_one(struct pkcs7_message *pkcs7, - struct pkcs7_signed_info *sinfo) + struct pkcs7_signed_info *sinfo, + struct x509_certificate **signer) +#else +static int pkcs7_verify_one(struct pkcs7_message *pkcs7, + struct pkcs7_signed_info *sinfo) +#endif { int ret; @@ -479,7 +526,7 @@ int pkcs7_verify_one(struct pkcs7_message *pkcs7, pr_devel("Verified signature %u\n", sinfo->index); /* Verify the internal certificate chain */ - return pkcs7_verify_sig_chain(pkcs7, sinfo); + return pkcs7_verify_sig_chain(pkcs7, sinfo, signer); } #ifndef __UBOOT__ |