/* $OpenBSD: t_x509.c,v 1.37 2021/12/25 13:17:48 jsing Exp $ */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 *
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 *
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 *
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <stdio.h>

#include <openssl/opensslconf.h>

#include <openssl/bn.h>
#include <openssl/buffer.h>
#include <openssl/err.h>
#include <openssl/objects.h>
#include <openssl/x509.h>
#include <openssl/x509v3.h>

#ifndef OPENSSL_NO_DSA
#include <openssl/dsa.h>
#endif
#ifndef OPENSSL_NO_EC
#include <openssl/ec.h>
#endif
#ifndef OPENSSL_NO_RSA
#include <openssl/rsa.h>
#endif

#include "asn1_locl.h"
#include "x509_lcl.h"

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) {
		X509error(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);
}

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;
	X509_CINF *ci;
	ASN1_INTEGER *bs;
	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;

	ci = x->cert_info;
	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 (BIO_printf(bp, "%8sVersion: %lu (0x%lx)\n",
		    "", l + 1, l) <= 0)
			goto err;
	}
	if (!(cflag & X509_FLAG_NO_SERIAL)) {
		if (BIO_write(bp, "        Serial Number:", 22) <= 0)
			goto err;

		bs = X509_get_serialNumber(x);
		l = -1;
		if (bs->length <= (int)sizeof(long))
			l = ASN1_INTEGER_get(bs);
		if (l != -1) {
			if (bs->type == V_ASN1_NEG_INTEGER) {
				l = -l;
				neg = "-";
			} else
				neg = "";
			if (BIO_printf(bp, " %s%lu (%s0x%lx)\n",
			    neg, l, neg, l) <= 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)) {
		if (X509_signature_print(bp, x->sig_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) < (nmflags == X509_FLAG_COMPAT ? 1 : 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_get_notBefore(x)))
			goto err;
		if (BIO_write(bp, "\n            Not After : ", 25) <= 0)
			goto err;
		if (!ASN1_TIME_print(bp, X509_get_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) < (nmflags == X509_FLAG_COMPAT ? 1 : 0))
			goto err;
		if (BIO_write(bp, "\n", 1) <= 0)
			goto err;
	}
	if (!(cflag & X509_FLAG_NO_PUBKEY)) {
		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, ci->key->algor->algorithm) <= 0)
			goto err;
		if (BIO_puts(bp, "\n") <= 0)
			goto err;

		pkey = X509_get_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);
			EVP_PKEY_free(pkey);
		}
	}

	if (!(cflag & X509_FLAG_NO_EXTENSIONS))
		X509V3_extensions_print(bp, "X509v3 extensions",
		    ci->extensions, cflag, 8);

	if (!(cflag & X509_FLAG_NO_SIGDUMP)) {
		if (X509_signature_print(bp, x->sig_alg, x->signature) <= 0)
			goto err;
	}
	if (!(cflag & X509_FLAG_NO_AUX)) {
		if (!X509_CERT_AUX_print(bp, x->aux, 0))
			goto err;
	}
	ret = 1;

 err:
	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];

	/* display the hash of the subject as it would appear
	   in OCSP requests */
	if (BIO_printf(bp, "        Subject OCSP hash: ") <= 0)
		goto err;
	if ((derlen = i2d_X509_NAME(x->cert_info->subject, NULL)) <= 0)
		goto err;
	if ((der = dertmp = malloc(derlen)) == NULL)
		goto err;
	if (i2d_X509_NAME(x->cert_info->subject, &dertmp) <= 0)
		goto err;

	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;
	}
	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;

	if (!EVP_Digest(x->cert_info->key->public_key->data,
	    x->cert_info->key->public_key->length,
	    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:
	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 (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;
	if (BIO_puts(bp, "    Signature Algorithm: ") <= 0)
		return 0;
	if (i2a_ASN1_OBJECT(bp, sigalg->algorithm) <= 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, 9, 0);
		}
	}
	if (sig)
		return X509_signature_dump(bp, sig, 9);
	else if (BIO_puts(bp, "\n") <= 0)
		return 0;
	return 1;
}

int
ASN1_TIME_print(BIO *bp, const ASN1_TIME *tm)
{
	if (tm->type == V_ASN1_UTCTIME)
		return ASN1_UTCTIME_print(bp, tm);
	if (tm->type == V_ASN1_GENERALIZEDTIME)
		return ASN1_GENERALIZEDTIME_print(bp, tm);
	BIO_write(bp, "Bad time value", 14);
	return (0);
}

static const char *mon[12] = {
	"Jan", "Feb", "Mar", "Apr", "May", "Jun",
	"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};

int
ASN1_GENERALIZEDTIME_print(BIO *bp, const ASN1_GENERALIZEDTIME *tm)
{
	char *v;
	int gmt = 0;
	int i;
	int y = 0, M = 0, d = 0, h = 0, m = 0, s = 0;
	char *f = "";
	int f_len = 0;

	i = tm->length;
	v = (char *)tm->data;

	if (i < 12)
		goto err;
	if (v[i-1] == 'Z')
		gmt = 1;
	for (i = 0; i < 12; i++)
		if ((v[i] > '9') || (v[i] < '0'))
			goto err;
	y = (v[0] - '0') * 1000 + (v[1] - '0') * 100 +
	    (v[2] - '0') * 10 + (v[3] - '0');
	M = (v[4] - '0') * 10 + (v[5] - '0');
	if ((M > 12) || (M < 1))
		goto err;
	d = (v[6] - '0') * 10 + (v[7] - '0');
	h = (v[8] - '0') * 10 + (v[9] - '0');
	m = (v[10] - '0') * 10 + (v[11] - '0');
	if (tm->length >= 14 &&
	    (v[12] >= '0') && (v[12] <= '9') &&
	    (v[13] >= '0') && (v[13] <= '9')) {
		s =  (v[12] - '0') * 10 + (v[13] - '0');
		/* Check for fractions of seconds. */
		if (tm->length >= 15 && v[14] == '.') {
			int l = tm->length;
			f = &v[14];	/* The decimal point. */
			f_len = 1;
			while (14 + f_len < l && f[f_len] >= '0' &&
			    f[f_len] <= '9')
				++f_len;
		}
	}

	if (BIO_printf(bp, "%s %2d %02d:%02d:%02d%.*s %d%s",
	    mon[M - 1], d, h, m, s, f_len, f, y, (gmt) ? " GMT" : "") <= 0)
		return (0);
	else
		return (1);

 err:
	BIO_write(bp, "Bad time value", 14);
	return (0);
}

int
ASN1_UTCTIME_print(BIO *bp, const ASN1_UTCTIME *tm)
{
	const char *v;
	int gmt = 0;
	int i;
	int y = 0, M = 0, d = 0, h = 0, m = 0, s = 0;

	i = tm->length;
	v = (const char *)tm->data;

	if (i < 10)
		goto err;
	if (v[i-1] == 'Z')
		gmt = 1;
	for (i = 0; i < 10; i++)
		if ((v[i] > '9') || (v[i] < '0'))
			goto err;
	y = (v[0] - '0') * 10 + (v[1] - '0');
	if (y < 50)
		y += 100;
	M = (v[2] - '0') * 10 + (v[3] - '0');
	if ((M > 12) || (M < 1))
		goto err;
	d = (v[4] - '0') * 10 + (v[5] - '0');
	h = (v[6] - '0') * 10 + (v[7] - '0');
	m = (v[8] - '0') * 10 + (v[9] - '0');
	if (tm->length >=12 &&
	    (v[10] >= '0') && (v[10] <= '9') &&
	    (v[11] >= '0') && (v[11] <= '9'))
		s = (v[10] - '0') * 10 + (v[11] - '0');

	if (BIO_printf(bp, "%s %2d %02d:%02d:%02d %d%s",
	    mon[M - 1], d, h, m, s, y + 1900, (gmt) ? " GMT" : "") <= 0)
		return (0);
	else
		return (1);

 err:
	BIO_write(bp, "Bad time value", 14);
	return (0);
}

int
X509_NAME_print(BIO *bp, const X509_NAME *name, int obase)
{
	char *s, *c, *b;
	int ret = 0, l, i;

	l = 80 - 2 - obase;

	b = X509_NAME_oneline(name, NULL, 0);
	if (b == NULL)
		return 0;
	if (*b == '\0') {
		free(b);
		return 1;
	}
	s = b + 1; /* skip the first slash */

	c = s;
	for (;;) {
		if (((*s == '/') &&
		    ((s[1] >= 'A') && (s[1] <= 'Z') &&
		    ((s[2] == '=') || ((s[2] >= 'A') && (s[2] <= 'Z') &&
		    (s[3] == '='))))) || (*s == '\0')) {
			i = s - c;
			if (BIO_write(bp, c, i) != i)
				goto err;
			c = s + 1;	/* skip following slash */
			if (*s != '\0') {
				if (BIO_write(bp, ", ", 2) != 2)
					goto err;
			}
			l--;
		}
		if (*s == '\0')
			break;
		s++;
		l--;
	}

	ret = 1;
	if (0) {
 err:
		X509error(ERR_R_BUF_LIB);
	}
	free(b);
	return (ret);
}
