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openssl/crypto/x509/t_x509.c
Ingo Schwarze c5dc9ab965 Fix a read buffer overrun in X509_aux_print(). 
The ASN1_STRING_get0_data(3) manual explitely cautions the reader
that the data is not necessarily NUL-terminated, and the function
X509_alias_set1(3) does not sanitize the data passed into it in any
way either, so we must assume the return value from X509_alias_get0(3)
is merely a byte array and not necessarily a string in the sense
of the C language.

I found this bug while writing manual pages for X509_print_ex(3)
and related functions.  Theo Buehler <tb@openbsd.org> checked my
patch to fix the same bug in LibreSSL, see

http://cvsweb.openbsd.org/src/lib/libcrypto/asn1/t_x509a.c#rev1.9

As an aside, note that the function still produces incomplete and
misleading results when the data contains a NUL byte in the middle
and that error handling is consistently absent throughout, even
though the function provides an "int" return value obviously intended
to be 1 for success and 0 for failure, and even though this function
is called by another function that also wants to return 1 for success
and 0 for failure and even does so in many of its code paths, though
not in others.  But let's stay focussed.  Many things would be nice
to have in the wide wild world, but a buffer overflow must not be
allowed to remain in our backyard.

CLA: trivial

Reviewed-by: Tim Hudson <tjh@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/16108)
2021-07-20 09:40:56 +02:00

530 lines
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/*
* Copyright 1995-2021 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"
#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) {
ERR_raise(ERR_LIB_X509, 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, printok = 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;
printok = 1;
}
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 >= X509_VERSION_1 && l <= X509_VERSION_3) {
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)
< printok)
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 (ossl_asn1_time_print_ex(bp, X509_get0_notBefore(x), ASN1_DTFLGS_RFC822) == 0)
goto err;
if (BIO_write(bp, "\n Not After : ", 25) <= 0)
goto err;
if (ossl_asn1_time_print_ex(bp, X509_get0_notAfter(x), ASN1_DTFLGS_RFC822) == 0)
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) < printok)
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;
EVP_MD *md = NULL;
if (x == NULL || bp == NULL)
return 0;
/*
* 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 (derlen <= 0)
goto err;
if ((der = dertmp = OPENSSL_malloc(derlen)) == NULL)
goto err;
i2d_X509_NAME(subj, &dertmp);
md = EVP_MD_fetch(x->libctx, SN_sha1, x->propq);
if (md == NULL)
goto err;
if (!EVP_Digest(der, derlen, SHA1md, NULL, md, 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, md, 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");
EVP_MD_free(md);
return 1;
err:
OPENSSL_free(der);
EVP_MD_free(md);
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, &i);
if (alias)
BIO_printf(out, "%*sAlias: %.*s\n", indent, "", i, 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 ossl_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 (!ossl_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");
ossl_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));
}
ERR_raise(ERR_LIB_X509, X509_R_CERTIFICATE_VERIFICATION_FAILED);
ERR_add_error_mem_bio("\n", bio);
BIO_free(bio);
}
return ok;
}
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