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From 73c156f998e848c5e383ddd715193d84d95e5c39 Mon Sep 17 00:00:00 2001
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From: Sumit Bose <sbose@redhat.com>
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Date: Fri, 26 Jan 2018 11:47:50 -0500
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Subject: [PATCH] Fix hex conversion of PKINIT certid strings
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When parsing a PKCS11 token specification, correctly convert from hex
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to binary instead of using OpenSSL bignum functions (which would strip
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leading zeros).
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[ghudson@mit.edu: made hex_string_to_bin() a bit less verbose; wrote
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commit message]
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ticket: 8636
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(cherry picked from commit 63e8b8142fd7b3931a7bf2d6448978ca536bafc0)
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---
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.../preauth/pkinit/pkinit_crypto_openssl.c | 55 +++++++++++++++----
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1 file changed, 44 insertions(+), 11 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 85ca8885d..6098acc6a 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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@@ -4640,6 +4640,43 @@ reassemble_pkcs11_name(pkinit_identity_opts *idopts)
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return ret;
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}
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+static int
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+hex_string_to_bin(const char *str, int *bin_len_out, CK_BYTE **bin_out)
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+{
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+ size_t str_len, i;
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+ CK_BYTE *bin;
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+ char *endptr, tmp[3] = { '\0', '\0', '\0' };
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+ long val;
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+
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+ *bin_len_out = 0;
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+ *bin_out = NULL;
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+
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+ str_len = strlen(str);
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+ if (str_len % 2 != 0)
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+ return EINVAL;
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+ bin = malloc(str_len / 2);
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+ if (bin == NULL)
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+ return ENOMEM;
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+
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+ errno = 0;
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+ for (i = 0; i < str_len / 2; i++) {
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+ tmp[0] = str[i * 2];
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+ tmp[1] = str[i * 2 + 1];
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+
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+ val = strtol(tmp, &endptr, 16);
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+ if (val < 0 || val > 255 || errno != 0 || endptr != &tmp[2]) {
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+ free(bin);
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+ return EINVAL;
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+ }
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+
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+ bin[i] = (CK_BYTE)val;
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+ }
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+
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+ *bin_len_out = str_len / 2;
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+ *bin_out = bin;
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+ return 0;
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+}
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+
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static krb5_error_code
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pkinit_get_certs_pkcs11(krb5_context context,
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pkinit_plg_crypto_context plg_cryptoctx,
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@@ -4682,18 +4719,14 @@ pkinit_get_certs_pkcs11(krb5_context context,
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}
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/* Convert the ascii cert_id string into a binary blob */
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if (idopts->cert_id_string != NULL) {
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- BIGNUM *bn = NULL;
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- BN_hex2bn(&bn, idopts->cert_id_string);
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- if (bn == NULL)
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- return ENOMEM;
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- id_cryptoctx->cert_id_len = BN_num_bytes(bn);
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- id_cryptoctx->cert_id = malloc((size_t) id_cryptoctx->cert_id_len);
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- if (id_cryptoctx->cert_id == NULL) {
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- BN_free(bn);
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- return ENOMEM;
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+ r = hex_string_to_bin(idopts->cert_id_string,
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+ &id_cryptoctx->cert_id_len,
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+ &id_cryptoctx->cert_id);
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+ if (r != 0) {
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+ pkiDebug("Failed to convert certid string [%s]\n",
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+ idopts->cert_id_string);
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+ return r;
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}
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- BN_bn2bin(bn, id_cryptoctx->cert_id);
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- BN_free(bn);
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}
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id_cryptoctx->slotid = idopts->slotid;
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id_cryptoctx->pkcs11_method = 1;
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