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From 75f71ace74449a6e5154314229bfa61960cd326c Mon Sep 17 00:00:00 2001
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From: Julien Rische <jrische@redhat.com>
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Date: Thu, 28 Jul 2022 15:20:12 +0200
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Subject: [PATCH] Update error checking for OpenSSL CMS_verify
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The code for CMS data verification was initially written for OpenSSL's
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PKCS7_verify() function. It now uses CMS_verify(), but error handling
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is still done using PKCS7_verify() error identifiers. Update the
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recognized error codes so that the KDC generates
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KDC_ERR_DIGEST_IN_SIGNED_DATA_NOT_ACCEPTED errors when appropriate.
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Use ERR_peek_last_error() to observe the error generated closest to
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the API surface.
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[ghudson@mit.edu: edited commit message]
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ticket: 9069 (new)
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tags: pullup
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target_version: 1.20-next
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---
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src/plugins/preauth/pkinit/pkinit_crypto_openssl.c | 9 ++++++---
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1 file changed, 6 insertions(+), 3 deletions(-)
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diff --git a/src/plugins/preauth/pkinit/pkinit_crypto_openssl.c b/src/plugins/preauth/pkinit/pkinit_crypto_openssl.c
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index 1c2aa02827..16edf15cb2 100644
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--- a/src/plugins/preauth/pkinit/pkinit_crypto_openssl.c
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+++ b/src/plugins/preauth/pkinit/pkinit_crypto_openssl.c
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@@ -2102,12 +2102,15 @@ cms_signeddata_verify(krb5_context context,
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goto cleanup;
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out = BIO_new(BIO_s_mem());
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if (CMS_verify(cms, NULL, store, NULL, out, flags) == 0) {
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- unsigned long err = ERR_peek_error();
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+ unsigned long err = ERR_peek_last_error();
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switch(ERR_GET_REASON(err)) {
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- case PKCS7_R_DIGEST_FAILURE:
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+ case RSA_R_DIGEST_NOT_ALLOWED:
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+ case CMS_R_UNKNOWN_DIGEST_ALGORITHM:
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+ case CMS_R_NO_MATCHING_DIGEST:
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+ case CMS_R_NO_MATCHING_SIGNATURE:
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retval = KRB5KDC_ERR_DIGEST_IN_SIGNED_DATA_NOT_ACCEPTED;
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break;
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- case PKCS7_R_SIGNATURE_FAILURE:
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+ case CMS_R_VERIFICATION_FAILURE:
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default:
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retval = KRB5KDC_ERR_INVALID_SIG;
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}
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--
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2.38.1
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