/*

 * Copyright 1995-2023 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"

void OSSL_STACK_OF_X509_free(STACK_OF(X509) *certs)

{

    sk_X509_pop_free(certs, X509_free);

}

#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 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 == XN_FLAG_COMPAT)

        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:

    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);

        OSSL_STACK_OF_X509_free(certs);

        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 */

        if (bio == NULL)

            return 0;

        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;

}