Messages in this thread Patch in this message | | | Date | Fri, 21 Nov 2014 10:33:20 -0500 | From | Vivek Goyal <> | Subject | Re: [PATCH 2/5] X.509: Support X.509 lookup by Issuer+Serial form AuthorityKeyIdentifier |
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On Thu, Nov 20, 2014 at 04:54:14PM +0000, David Howells wrote:
[..] > @@ -215,21 +219,42 @@ static int pkcs7_verify_sig_chain(struct pkcs7_message *pkcs7, > /* Look through the X.509 certificates in the PKCS#7 message's > * list to see if the next one is there. > */ > - pr_debug("- want %*phN\n", > - x509->auth_skid->len, x509->auth_skid->data); > - for (p = pkcs7->certs; p; p = p->next) { > - if (!p->skid) > - continue; > - pr_debug("- cmp [%u] %*phN\n", > - p->index, p->skid->len, p->skid->data); > - if (asymmetric_key_id_same(p->skid, x509->auth_skid)) > - goto found_issuer; > + auth = x509->auth_id; > + if (auth) { > + pr_debug("- want %*phN\n", auth->len, auth->data); > + for (p = pkcs7->certs; p; p = p->next) { > + pr_debug("- cmp [%u] %*phN\n", > + p->index, p->id->len, p->id->data); > + if (asymmetric_key_id_same(p->id, auth)) > + goto found_issuer_check_skid; > + } > + } else { > + auth = x509->auth_skid; > + pr_debug("- want %*phN\n", auth->len, auth->data); > + for (p = pkcs7->certs; p; p = p->next) { > + if (!p->skid) > + continue; > + pr_debug("- cmp [%u] %*phN\n", > + p->index, p->skid->len, p->skid->data); > + if (asymmetric_key_id_same(p->skid, auth)) > + goto found_issuer; > + } > } > > /* We didn't find the root of this chain */ > pr_debug("- top\n"); > return 0; > > + found_issuer_check_skid: > + /* We matched issuer + serialNumber, but if there's an > + * authKeyId.keyId, that must match the CA subjKeyId also. > + */ > + if (x509->auth_skid && > + !asymmetric_key_id_same(p->skid, x509->auth_skid)) { > + pr_warn("Sig %u: X.509 chain contains auth-skid nonmatch (%u->%u)\n", > + sinfo->index, x509->index, p->index); > + return -EKEYREJECTED; > + }
Hi David,
A minor nit.
pkcs7_verify_sig_chain() is getting big with multiple goto labels. Will it make sense to introduce a helper function to see if cert B is authority cert of cert A or not. And then we should be able to get rid of labels like found_issuer_check_skid() and some of the inline code also go away.
Thanks Vivek
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