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tpm2-tools/SOURCES/0018-Generate-partial-X.509-certificate-using-own-struct.patch
CentOS Sources 1ecbece6d0 import tpm2-tools-5.0-10.el9
2021-12-09 15:37:11 +00:00

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From 22ecb8a2c00db7a53508d2106957e0c112a5a020 Mon Sep 17 00:00:00 2001
From: Petr Gotthard <petr.gotthard@centrum.cz>
Date: Tue, 31 Aug 2021 12:27:35 +0200
Subject: [PATCH 17/17] Generate partial X.509 certificate using own struct
The tpm2_certifyX509certutil.c:generate_partial_X509() creates a partial
(in fact, an incomplete) certificate, see Part 3, 18.8.1. The OpenSSL
team decided that starting from 3.0 the i2d should not create invalid
encodings, so we need to create an own ASN.1 structure for this.
The structure is adapted from
https://github.com/openssl/openssl/issues/16257#issuecomment-895448370.
Fixes: #2813
Signed-off-by: Petr Gotthard <petr.gotthard@centrum.cz>
---
tools/misc/tpm2_certifyX509certutil.c | 179 +++++++++-----------------
1 file changed, 59 insertions(+), 120 deletions(-)
diff --git a/tools/misc/tpm2_certifyX509certutil.c b/tools/misc/tpm2_certifyX509certutil.c
index 62ed644a..5eea08e8 100644
--- a/tools/misc/tpm2_certifyX509certutil.c
+++ b/tools/misc/tpm2_certifyX509certutil.c
@@ -8,6 +8,8 @@
#include <sys/stat.h>
#include <unistd.h>
+#include <openssl/asn1.h>
+#include <openssl/asn1t.h>
#include <openssl/x509.h>
#include <openssl/x509v3.h>
#include <openssl/bio.h>
@@ -15,6 +17,46 @@
#include "log.h"
#include "tpm2_tool.h"
+typedef struct {
+ ASN1_TIME *notBefore;
+ ASN1_TIME *notAfter;
+} TPM2_PARTIAL_CERT_VALIDITY;
+
+typedef struct {
+ X509_ALGOR *algorithm;
+ X509_NAME *issuer;
+ TPM2_PARTIAL_CERT_VALIDITY *validity;
+ X509_NAME *subject;
+ STACK_OF(X509_EXTENSION) *extensions;
+} TPM2_PARTIAL_CERT;
+
+ASN1_SEQUENCE(TPM2_PARTIAL_CERT_VALIDITY) = {
+ ASN1_SIMPLE(TPM2_PARTIAL_CERT_VALIDITY, notBefore, ASN1_TIME),
+ ASN1_SIMPLE(TPM2_PARTIAL_CERT_VALIDITY, notAfter, ASN1_TIME),
+} ASN1_SEQUENCE_END(TPM2_PARTIAL_CERT_VALIDITY)
+
+/* partialCertificate per Part 3, 18.8.1 */
+ASN1_SEQUENCE(TPM2_PARTIAL_CERT) = {
+ ASN1_OPT(TPM2_PARTIAL_CERT, algorithm, X509_ALGOR),
+ ASN1_SIMPLE(TPM2_PARTIAL_CERT, issuer, X509_NAME),
+ ASN1_SIMPLE(TPM2_PARTIAL_CERT, validity, TPM2_PARTIAL_CERT_VALIDITY),
+ ASN1_SIMPLE(TPM2_PARTIAL_CERT, subject, X509_NAME),
+ ASN1_EXP_SEQUENCE_OF(TPM2_PARTIAL_CERT, extensions, X509_EXTENSION, 3),
+} ASN1_SEQUENCE_END(TPM2_PARTIAL_CERT)
+
+IMPLEMENT_ASN1_FUNCTIONS(TPM2_PARTIAL_CERT)
+
+int i2d_TPM2_PARTIAL_CERT_bio(BIO *bp, const TPM2_PARTIAL_CERT *a)
+{
+ return ASN1_i2d_bio_of(TPM2_PARTIAL_CERT, i2d_TPM2_PARTIAL_CERT, bp, a);
+}
+
+int TPM2_add_ext(TPM2_PARTIAL_CERT *x, X509_EXTENSION *ex, int loc)
+{
+ return (X509v3_add_ext(&(x->extensions), ex, loc) != NULL);
+}
+
+
struct tpm_gen_partial_cert {
const char *out_path;
const char *valid_str;
@@ -95,80 +137,6 @@ static struct name_fields names[] = {
.def = "CA Unit" },
};
-static tool_rc fixup_cert(const char *cert) {
-
- int fd = open(cert, O_RDONLY);
- if (fd < 0) {
- LOG_ERR("open failed");
- return tool_rc_general_error;
- }
-
- struct stat fs;
- int ret = fstat(fd, &fs);
- if (ret < 0) {
- close(fd);
- return tool_rc_general_error;
- }
-
- ssize_t size = fs.st_size;
- if (size < 100 || size > 255) {
- LOG_ERR("Wrong cert size %zd", size);
- close(fd);
- return tool_rc_general_error; /* there is something wrong with this cert */
- }
-
- char* buf = calloc(1, size);
- if (!buf) {
- LOG_ERR("Alloc failed");
- close(fd);
- return tool_rc_general_error;
- }
-
- tool_rc rc = tool_rc_success;
- ret = read(fd, buf, size);
- close(fd);
- if (ret != size) {
- LOG_ERR("read failed");
- rc = tool_rc_general_error;
- goto out;
- }
-
- fd = open(cert, O_WRONLY | O_TRUNC);
- if (fd < 0) {
- LOG_ERR("second open failed");
- rc = tool_rc_general_error;
- goto out;
- }
-
- /* We need to skip one wrapping sequence (8 bytes) and one
- * sequence with one empty byte field at the end (5 bytes).
- * Fix the size here */
- buf[2] = size - 16;
-
- /* Write the external sequence with the fixed size */
- ret = write(fd, buf, 3);
- if (ret != 3) {
- LOG_ERR("write failed");
- rc = tool_rc_general_error;
- close(fd);
- goto out;
- }
-
- /* skip the wrapping sequence the write the rest
- * without the 5 bytes at the end */
- ret = write(fd, buf + 11, size - 16);
- close(fd);
- if (ret != size - 16) {
- LOG_ERR("second write failed");
- rc = tool_rc_general_error;
- }
-
-out:
- free(buf);
-
- return rc;
-}
-
static int populate_fields(X509_NAME *name, const char *opt) {
char *name_opt = strdup(opt);
@@ -228,19 +196,14 @@ static tool_rc generate_partial_X509() {
}
X509_EXTENSION *extv3 = NULL;
- X509 *cert = X509_new();
+ TPM2_PARTIAL_CERT *cert = TPM2_PARTIAL_CERT_new();
if (!cert) {
- LOG_ERR("X509_new");
- goto out_err;
- }
-
- X509_NAME *issuer = X509_get_issuer_name(cert);
- if (!issuer) {
- LOG_ERR("X509_get_issuer_name");
+ LOG_ERR("TPM2_PARTIAL_CERT_new");
goto out_err;
}
- int fields_added = populate_fields(issuer, ctx.issuer);
+ /* populate issuer */
+ int fields_added = populate_fields(cert->issuer, ctx.issuer);
if (fields_added <= 0) {
LOG_ERR("Could not parse any issuer fields");
goto out_err;
@@ -248,28 +211,18 @@ static tool_rc generate_partial_X509() {
LOG_INFO("Added %d issuer fields", fields_added);
}
- int ret = X509_set_issuer_name(cert, issuer); // add issuer
- if (ret != 1) {
- LOG_ERR("X509_set_issuer_name");
- goto out_err;
- }
-
+ /* populate validity */
unsigned int valid_days;
if (!tpm2_util_string_to_uint32(ctx.valid_str, &valid_days)) {
LOG_ERR("string_to_uint32");
goto out_err;
}
- X509_gmtime_adj(X509_getm_notBefore(cert), 0); // add valid not before
- X509_gmtime_adj(X509_getm_notAfter(cert), valid_days * 86400); // add valid not after
-
- X509_NAME *subject = X509_get_subject_name(cert);
- if (!subject) {
- LOG_ERR("X509_get_subject_name");
- goto out_err;
- }
+ X509_gmtime_adj(cert->validity->notBefore, 0); // add valid not before
+ X509_gmtime_adj(cert->validity->notAfter, valid_days * 86400); // add valid not after
- fields_added = populate_fields(subject, ctx.subject);
+ /* populate subject */
+ fields_added = populate_fields(cert->subject, ctx.subject);
if (fields_added <= 0) {
LOG_ERR("Could not parse any subject fields");
goto out_err;
@@ -277,51 +230,37 @@ static tool_rc generate_partial_X509() {
LOG_INFO("Added %d subject fields", fields_added);
}
- ret = X509_set_subject_name(cert, subject); // add subject
- if (ret != 1) {
- LOG_ERR("X509_NAME_add_entry_by_txt");
- goto out_err;
- }
-
+ /* populate extensions */
extv3 = X509V3_EXT_conf_nid(NULL, NULL, NID_key_usage,
- "critical,digitalSignature,keyCertSign,cRLSign");
+ "critical,digitalSignature,keyCertSign,cRLSign");
if (!extv3) {
LOG_ERR("X509V3_EXT_conf_nid");
goto out_err;
}
- ret = X509_add_ext(cert, extv3, -1); // add required v3 extention: key usage
+ int ret = TPM2_add_ext(cert, extv3, -1); // add required v3 extention: key usage
if (ret != 1) {
LOG_ERR("X509_add_ext");
goto out_err;
}
- ret = i2d_X509_bio(cert_out, cert); // print cert in DER format
+ /* output */
+ ret = i2d_TPM2_PARTIAL_CERT_bio(cert_out, cert); // print cert in DER format
if (ret != 1) {
LOG_ERR("i2d_X509_bio");
goto out_err;
}
X509_EXTENSION_free(extv3);
- X509_free(cert);
+ TPM2_PARTIAL_CERT_free(cert);
BIO_free_all(cert_out);
- ret = fixup_cert(ctx.out_path);
- if (ret) {
- LOG_ERR("fixup_cert");
- return tool_rc_general_error;
- }
-
return tool_rc_success;
out_err:
BIO_free_all(cert_out);
- if (cert) {
- X509_free(cert);
- }
- if (extv3) {
- X509_EXTENSION_free(extv3);
- }
+ X509_EXTENSION_free(extv3);
+ TPM2_PARTIAL_CERT_free(cert);
return tool_rc_general_error;
}
--
2.31.1
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