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openssl/crypto/x509/t_x509.c
Matt Caswell e6623cfbff Fix safestack issues in x509.h 
Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/12781)
2020-09-13 11:09:45 +01:00

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/*
* Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stdio.h>
#include "internal/cryptlib.h"
#include <openssl/buffer.h>
#include <openssl/bn.h>
#include <openssl/objects.h>
#include <openssl/x509.h>
#include <openssl/x509v3.h>
#include "crypto/asn1.h"
#include "crypto/x509.h"
DEFINE_STACK_OF(ASN1_OBJECT)
#ifndef OPENSSL_NO_STDIO
int X509_print_fp(FILE *fp, X509 *x)
{
return X509_print_ex_fp(fp, x, XN_FLAG_COMPAT, X509_FLAG_COMPAT);
}
int X509_print_ex_fp(FILE *fp, X509 *x, unsigned long nmflag,
unsigned long cflag)
{
BIO *b;
int ret;
if ((b = BIO_new(BIO_s_file())) == NULL) {
X509err(X509_F_X509_PRINT_EX_FP, ERR_R_BUF_LIB);
return 0;
}
BIO_set_fp(b, fp, BIO_NOCLOSE);
ret = X509_print_ex(b, x, nmflag, cflag);
BIO_free(b);
return ret;
}
#endif
int X509_print(BIO *bp, X509 *x)
{
return X509_print_ex(bp, x, XN_FLAG_COMPAT, X509_FLAG_COMPAT);
}
int X509_print_ex(BIO *bp, X509 *x, unsigned long nmflags,
unsigned long cflag)
{
long l;
int ret = 0, i;
char *m = NULL, mlch = ' ';
int nmindent = 0;
EVP_PKEY *pkey = NULL;
const char *neg;
if ((nmflags & XN_FLAG_SEP_MASK) == XN_FLAG_SEP_MULTILINE) {
mlch = '\n';
nmindent = 12;
}
if (nmflags == X509_FLAG_COMPAT)
nmindent = 16;
if (!(cflag & X509_FLAG_NO_HEADER)) {
if (BIO_write(bp, "Certificate:\n", 13) <= 0)
goto err;
if (BIO_write(bp, " Data:\n", 10) <= 0)
goto err;
}
if (!(cflag & X509_FLAG_NO_VERSION)) {
l = X509_get_version(x);
if (l >= 0 && l <= 2) {
if (BIO_printf(bp, "%8sVersion: %ld (0x%lx)\n", "", l + 1, (unsigned long)l) <= 0)
goto err;
} else {
if (BIO_printf(bp, "%8sVersion: Unknown (%ld)\n", "", l) <= 0)
goto err;
}
}
if (!(cflag & X509_FLAG_NO_SERIAL)) {
const ASN1_INTEGER *bs = X509_get0_serialNumber(x);
if (BIO_write(bp, " Serial Number:", 22) <= 0)
goto err;
if (bs->length <= (int)sizeof(long)) {
ERR_set_mark();
l = ASN1_INTEGER_get(bs);
ERR_pop_to_mark();
} else {
l = -1;
}
if (l != -1) {
unsigned long ul;
if (bs->type == V_ASN1_NEG_INTEGER) {
ul = 0 - (unsigned long)l;
neg = "-";
} else {
ul = l;
neg = "";
}
if (BIO_printf(bp, " %s%lu (%s0x%lx)\n", neg, ul, neg, ul) <= 0)
goto err;
} else {
neg = (bs->type == V_ASN1_NEG_INTEGER) ? " (Negative)" : "";
if (BIO_printf(bp, "\n%12s%s", "", neg) <= 0)
goto err;
for (i = 0; i < bs->length; i++) {
if (BIO_printf(bp, "%02x%c", bs->data[i],
((i + 1 == bs->length) ? '\n' : ':')) <= 0)
goto err;
}
}
}
if (!(cflag & X509_FLAG_NO_SIGNAME)) {
const X509_ALGOR *tsig_alg = X509_get0_tbs_sigalg(x);
if (BIO_puts(bp, " ") <= 0)
goto err;
if (X509_signature_print(bp, tsig_alg, NULL) <= 0)
goto err;
}
if (!(cflag & X509_FLAG_NO_ISSUER)) {
if (BIO_printf(bp, " Issuer:%c", mlch) <= 0)
goto err;
if (X509_NAME_print_ex(bp, X509_get_issuer_name(x), nmindent, nmflags)
< 0)
goto err;
if (BIO_write(bp, "\n", 1) <= 0)
goto err;
}
if (!(cflag & X509_FLAG_NO_VALIDITY)) {
if (BIO_write(bp, " Validity\n", 17) <= 0)
goto err;
if (BIO_write(bp, " Not Before: ", 24) <= 0)
goto err;
if (!ASN1_TIME_print(bp, X509_get0_notBefore(x)))
goto err;
if (BIO_write(bp, "\n Not After : ", 25) <= 0)
goto err;
if (!ASN1_TIME_print(bp, X509_get0_notAfter(x)))
goto err;
if (BIO_write(bp, "\n", 1) <= 0)
goto err;
}
if (!(cflag & X509_FLAG_NO_SUBJECT)) {
if (BIO_printf(bp, " Subject:%c", mlch) <= 0)
goto err;
if (X509_NAME_print_ex
(bp, X509_get_subject_name(x), nmindent, nmflags) < 0)
goto err;
if (BIO_write(bp, "\n", 1) <= 0)
goto err;
}
if (!(cflag & X509_FLAG_NO_PUBKEY)) {
X509_PUBKEY *xpkey = X509_get_X509_PUBKEY(x);
ASN1_OBJECT *xpoid;
X509_PUBKEY_get0_param(&xpoid, NULL, NULL, NULL, xpkey);
if (BIO_write(bp, " Subject Public Key Info:\n", 33) <= 0)
goto err;
if (BIO_printf(bp, "%12sPublic Key Algorithm: ", "") <= 0)
goto err;
if (i2a_ASN1_OBJECT(bp, xpoid) <= 0)
goto err;
if (BIO_puts(bp, "\n") <= 0)
goto err;
pkey = X509_get0_pubkey(x);
if (pkey == NULL) {
BIO_printf(bp, "%12sUnable to load Public Key\n", "");
ERR_print_errors(bp);
} else {
EVP_PKEY_print_public(bp, pkey, 16, NULL);
}
}
if (!(cflag & X509_FLAG_NO_IDS)) {
const ASN1_BIT_STRING *iuid, *suid;
X509_get0_uids(x, &iuid, &suid);
if (iuid != NULL) {
if (BIO_printf(bp, "%8sIssuer Unique ID: ", "") <= 0)
goto err;
if (!X509_signature_dump(bp, iuid, 12))
goto err;
}
if (suid != NULL) {
if (BIO_printf(bp, "%8sSubject Unique ID: ", "") <= 0)
goto err;
if (!X509_signature_dump(bp, suid, 12))
goto err;
}
}
if (!(cflag & X509_FLAG_NO_EXTENSIONS)
&& !X509V3_extensions_print(bp, "X509v3 extensions",
X509_get0_extensions(x), cflag, 8))
goto err;
if (!(cflag & X509_FLAG_NO_SIGDUMP)) {
const X509_ALGOR *sig_alg;
const ASN1_BIT_STRING *sig;
X509_get0_signature(&sig, &sig_alg, x);
if (X509_signature_print(bp, sig_alg, sig) <= 0)
goto err;
}
if (!(cflag & X509_FLAG_NO_AUX)) {
if (!X509_aux_print(bp, x, 0))
goto err;
}
ret = 1;
err:
OPENSSL_free(m);
return ret;
}
int X509_ocspid_print(BIO *bp, X509 *x)
{
unsigned char *der = NULL;
unsigned char *dertmp;
int derlen;
int i;
unsigned char SHA1md[SHA_DIGEST_LENGTH];
ASN1_BIT_STRING *keybstr;
const X509_NAME *subj;
/*
* display the hash of the subject as it would appear in OCSP requests
*/
if (BIO_printf(bp, " Subject OCSP hash: ") <= 0)
goto err;
subj = X509_get_subject_name(x);
derlen = i2d_X509_NAME(subj, NULL);
if ((der = dertmp = OPENSSL_malloc(derlen)) == NULL)
goto err;
i2d_X509_NAME(subj, &dertmp);
if (!EVP_Digest(der, derlen, SHA1md, NULL, EVP_sha1(), NULL))
goto err;
for (i = 0; i < SHA_DIGEST_LENGTH; i++) {
if (BIO_printf(bp, "%02X", SHA1md[i]) <= 0)
goto err;
}
OPENSSL_free(der);
der = NULL;
/*
* display the hash of the public key as it would appear in OCSP requests
*/
if (BIO_printf(bp, "\n Public key OCSP hash: ") <= 0)
goto err;
keybstr = X509_get0_pubkey_bitstr(x);
if (keybstr == NULL)
goto err;
if (!EVP_Digest(ASN1_STRING_get0_data(keybstr),
ASN1_STRING_length(keybstr), SHA1md, NULL, EVP_sha1(),
NULL))
goto err;
for (i = 0; i < SHA_DIGEST_LENGTH; i++) {
if (BIO_printf(bp, "%02X", SHA1md[i]) <= 0)
goto err;
}
BIO_printf(bp, "\n");
return 1;
err:
OPENSSL_free(der);
return 0;
}
int X509_signature_dump(BIO *bp, const ASN1_STRING *sig, int indent)
{
const unsigned char *s;
int i, n;
n = sig->length;
s = sig->data;
for (i = 0; i < n; i++) {
if ((i % 18) == 0) {
if (i > 0 && BIO_write(bp, "\n", 1) <= 0)
return 0;
if (BIO_indent(bp, indent, indent) <= 0)
return 0;
}
if (BIO_printf(bp, "%02x%s", s[i], ((i + 1) == n) ? "" : ":") <= 0)
return 0;
}
if (BIO_write(bp, "\n", 1) != 1)
return 0;
return 1;
}
int X509_signature_print(BIO *bp, const X509_ALGOR *sigalg,
const ASN1_STRING *sig)
{
int sig_nid;
int indent = 4;
if (BIO_printf(bp, "%*sSignature Algorithm: ", indent, "") <= 0)
return 0;
if (i2a_ASN1_OBJECT(bp, sigalg->algorithm) <= 0)
return 0;
if (sig && BIO_printf(bp, "\n%*sSignature Value:", indent, "") <= 0)
return 0;
sig_nid = OBJ_obj2nid(sigalg->algorithm);
if (sig_nid != NID_undef) {
int pkey_nid, dig_nid;
const EVP_PKEY_ASN1_METHOD *ameth;
if (OBJ_find_sigid_algs(sig_nid, &dig_nid, &pkey_nid)) {
ameth = EVP_PKEY_asn1_find(NULL, pkey_nid);
if (ameth && ameth->sig_print)
return ameth->sig_print(bp, sigalg, sig, indent + 4, 0);
}
}
if (BIO_write(bp, "\n", 1) != 1)
return 0;
if (sig)
return X509_signature_dump(bp, sig, indent + 4);
return 1;
}
int X509_aux_print(BIO *out, X509 *x, int indent)
{
char oidstr[80], first;
STACK_OF(ASN1_OBJECT) *trust, *reject;
const unsigned char *alias, *keyid;
int keyidlen;
int i;
if (X509_trusted(x) == 0)
return 1;
trust = X509_get0_trust_objects(x);
reject = X509_get0_reject_objects(x);
if (trust) {
first = 1;
BIO_printf(out, "%*sTrusted Uses:\n%*s", indent, "", indent + 2, "");
for (i = 0; i < sk_ASN1_OBJECT_num(trust); i++) {
if (!first)
BIO_puts(out, ", ");
else
first = 0;
OBJ_obj2txt(oidstr, sizeof(oidstr),
sk_ASN1_OBJECT_value(trust, i), 0);
BIO_puts(out, oidstr);
}
BIO_puts(out, "\n");
} else
BIO_printf(out, "%*sNo Trusted Uses.\n", indent, "");
if (reject) {
first = 1;
BIO_printf(out, "%*sRejected Uses:\n%*s", indent, "", indent + 2, "");
for (i = 0; i < sk_ASN1_OBJECT_num(reject); i++) {
if (!first)
BIO_puts(out, ", ");
else
first = 0;
OBJ_obj2txt(oidstr, sizeof(oidstr),
sk_ASN1_OBJECT_value(reject, i), 0);
BIO_puts(out, oidstr);
}
BIO_puts(out, "\n");
} else
BIO_printf(out, "%*sNo Rejected Uses.\n", indent, "");
alias = X509_alias_get0(x, NULL);
if (alias)
BIO_printf(out, "%*sAlias: %s\n", indent, "", alias);
keyid = X509_keyid_get0(x, &keyidlen);
if (keyid) {
BIO_printf(out, "%*sKey Id: ", indent, "");
for (i = 0; i < keyidlen; i++)
BIO_printf(out, "%s%02X", i ? ":" : "", keyid[i]);
BIO_write(out, "\n", 1);
}
return 1;
}
/*
* Helper functions for improving certificate verification error diagnostics
*/
int x509_print_ex_brief(BIO *bio, X509 *cert, unsigned long neg_cflags)
{
unsigned long flags = ASN1_STRFLGS_RFC2253 | ASN1_STRFLGS_ESC_QUOTE |
XN_FLAG_SEP_CPLUS_SPC | XN_FLAG_FN_SN;
if (cert == NULL)
return BIO_printf(bio, " (no certificate)\n") > 0;
if (BIO_printf(bio, " certificate\n") <= 0
|| !X509_print_ex(bio, cert, flags, ~X509_FLAG_NO_SUBJECT))
return 0;
if (X509_check_issued((X509 *)cert, cert) == X509_V_OK) {
if (BIO_printf(bio, " self-issued\n") <= 0)
return 0;
} else {
if (BIO_printf(bio, " ") <= 0
|| !X509_print_ex(bio, cert, flags, ~X509_FLAG_NO_ISSUER))
return 0;
}
if (!X509_print_ex(bio, cert, flags,
~(X509_FLAG_NO_SERIAL | X509_FLAG_NO_VALIDITY)))
return 0;
if (X509_cmp_current_time(X509_get0_notBefore(cert)) > 0)
if (BIO_printf(bio, " not yet valid\n") <= 0)
return 0;
if (X509_cmp_current_time(X509_get0_notAfter(cert)) < 0)
if (BIO_printf(bio, " no more valid\n") <= 0)
return 0;
return X509_print_ex(bio, cert, flags,
~neg_cflags & ~X509_FLAG_EXTENSIONS_ONLY_KID);
}
static int print_certs(BIO *bio, const STACK_OF(X509) *certs)
{
int i;
if (certs == NULL || sk_X509_num(certs) <= 0)
return BIO_printf(bio, " (no certificates)\n") >= 0;
for (i = 0; i < sk_X509_num(certs); i++) {
X509 *cert = sk_X509_value(certs, i);
if (cert != NULL) {
if (!x509_print_ex_brief(bio, cert, 0))
return 0;
if (!X509V3_extensions_print(bio, NULL,
X509_get0_extensions(cert),
X509_FLAG_EXTENSIONS_ONLY_KID, 8))
return 0;
}
}
return 1;
}
static int print_store_certs(BIO *bio, X509_STORE *store)
{
if (store != NULL) {
STACK_OF(X509) *certs = X509_STORE_get1_all_certs(store);
int ret = print_certs(bio, certs);
sk_X509_pop_free(certs, X509_free);
return ret;
} else {
return BIO_printf(bio, " (no trusted store)\n") >= 0;
}
}
/* Extend the error queue with details on a failed cert verification */
int X509_STORE_CTX_print_verify_cb(int ok, X509_STORE_CTX *ctx)
{
if (ok == 0 && ctx != NULL) {
int cert_error = X509_STORE_CTX_get_error(ctx);
BIO *bio = BIO_new(BIO_s_mem()); /* may be NULL */
BIO_printf(bio, "%s at depth = %d error = %d (%s)\n",
X509_STORE_CTX_get0_parent_ctx(ctx) != NULL
? "CRL path validation"
: "Certificate verification",
X509_STORE_CTX_get_error_depth(ctx),
cert_error, X509_verify_cert_error_string(cert_error));
{
X509_STORE *ts = X509_STORE_CTX_get0_store(ctx);
X509_VERIFY_PARAM *vpm = X509_STORE_get0_param(ts);
char *str;
int idx = 0;
switch (cert_error) {
case X509_V_ERR_HOSTNAME_MISMATCH:
BIO_printf(bio, "Expected hostname(s) = ");
while ((str = X509_VERIFY_PARAM_get0_host(vpm, idx++)) != NULL)
BIO_printf(bio, "%s%s", idx == 1 ? "" : ", ", str);
BIO_printf(bio, "\n");
break;
case X509_V_ERR_EMAIL_MISMATCH:
str = X509_VERIFY_PARAM_get0_email(vpm);
if (str != NULL)
BIO_printf(bio, "Expected email address = %s\n", str);
break;
case X509_V_ERR_IP_ADDRESS_MISMATCH:
str = X509_VERIFY_PARAM_get1_ip_asc(vpm);
if (str != NULL)
BIO_printf(bio, "Expected IP address = %s\n", str);
OPENSSL_free(str);
break;
default:
break;
}
}
BIO_printf(bio, "Failure for:\n");
x509_print_ex_brief(bio, X509_STORE_CTX_get_current_cert(ctx),
X509_FLAG_NO_EXTENSIONS);
if (cert_error == X509_V_ERR_CERT_UNTRUSTED
|| cert_error == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT
|| cert_error == X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN
|| cert_error == X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT
|| cert_error == X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY
|| cert_error == X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER
|| cert_error == X509_V_ERR_STORE_LOOKUP) {
BIO_printf(bio, "Non-trusted certs:\n");
print_certs(bio, X509_STORE_CTX_get0_untrusted(ctx));
BIO_printf(bio, "Certs in trust store:\n");
print_store_certs(bio, X509_STORE_CTX_get0_store(ctx));
}
X509err(0, X509_R_CERTIFICATE_VERIFICATION_FAILED);
ERR_add_error_mem_bio("\n", bio);
BIO_free(bio);
}
/*
* TODO we could check policies here too, e.g.:
* if (cert_error == X509_V_OK && ok == 2)
* policies_print(NULL, ctx);
*/
return ok;
}
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