krb5/SOURCES/Use-SHA-256-instead-of-MD5-...

54 lines
1.7 KiB
Diff

From a9bc03fe03ef4b00bcdad13c99bb4c376a8b9964 Mon Sep 17 00:00:00 2001
From: Greg Hudson <ghudson@mit.edu>
Date: Tue, 10 Jul 2018 16:17:15 -0400
Subject: [PATCH] Use SHA-256 instead of MD5 for audit ticket IDs
ticket: 8711 (new)
(cherry picked from commit c1e1bfa26bd2f045e88e6013c500fca9428c98f3)
---
src/kdc/kdc_audit.c | 21 ++++++++++-----------
1 file changed, 10 insertions(+), 11 deletions(-)
diff --git a/src/kdc/kdc_audit.c b/src/kdc/kdc_audit.c
index c9a7f9f9d..f40913dc8 100644
--- a/src/kdc/kdc_audit.c
+++ b/src/kdc/kdc_audit.c
@@ -146,7 +146,7 @@ kau_make_tkt_id(krb5_context context,
{
krb5_error_code ret = 0;
char *hash = NULL, *ptr;
- krb5_checksum cksum;
+ uint8_t hashbytes[K5_SHA256_HASHLEN];
unsigned int i;
*out = NULL;
@@ -154,19 +154,18 @@ kau_make_tkt_id(krb5_context context,
if (ticket == NULL)
return EINVAL;
- ret = krb5_c_make_checksum(context, CKSUMTYPE_RSA_MD5, NULL, 0,
- &ticket->enc_part.ciphertext, &cksum);
+ ret = k5_sha256(&ticket->enc_part.ciphertext, 1, hashbytes);
if (ret)
return ret;
- hash = k5alloc(cksum.length * 2 + 1, &ret);
- if (hash != NULL) {
- for (i = 0, ptr = hash; i < cksum.length; i++, ptr += 2)
- snprintf(ptr, 3, "%02X", cksum.contents[i]);
- *ptr = '\0';
- *out = hash;
- }
- krb5_free_checksum_contents(context, &cksum);
+ hash = k5alloc(sizeof(hashbytes) * 2 + 1, &ret);
+ if (hash == NULL)
+ return ret;
+
+ for (i = 0, ptr = hash; i < sizeof(hashbytes); i++, ptr += 2)
+ snprintf(ptr, 3, "%02X", hashbytes[i]);
+ *ptr = '\0';
+ *out = hash;
return 0;
}