/* 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 <ctype.h>
#include <openssl_grpc/asn1.h>
#include <openssl_grpc/bio.h>
#include <openssl_grpc/digest.h>
#include <openssl_grpc/err.h>
#include <openssl_grpc/evp.h>
#include <openssl_grpc/mem.h>
#include <openssl_grpc/obj.h>
#include <openssl_grpc/x509.h>
#include <openssl_grpc/x509v3.h>

#include "internal.h"


#ifndef OPENSSL_NO_FP_API
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) {
        OPENSSL_PUT_ERROR(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);
}

int X509_print_fp(FILE *fp, X509 *x)
{
    return X509_print_ex_fp(fp, x, XN_FLAG_COMPAT, X509_FLAG_COMPAT);
}
#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;
    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);
        if (bs->length < (int)sizeof(long)
            || (bs->length == sizeof(long) && (bs->data[0] & 0x80) == 0)) {
            l = ASN1_INTEGER_get(bs);
            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, ci->signature, 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_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) < 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_IDS)) {
        if (ci->issuerUID) {
            if (BIO_printf(bp, "%8sIssuer Unique ID: ", "") <= 0)
                goto err;
            if (!X509_signature_dump(bp, ci->issuerUID, 12))
                goto err;
        }
        if (ci->subjectUID) {
            if (BIO_printf(bp, "%8sSubject Unique ID: ", "") <= 0)
                goto err;
            if (!X509_signature_dump(bp, ci->subjectUID, 12))
                goto err;
        }
    }

    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:
    if (m != NULL)
        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];

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

    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:
    if (der != NULL)
        OPENSSL_free(der);
    return (0);
}

int X509_signature_print(BIO *bp, const X509_ALGOR *sigalg,
                         const ASN1_STRING *sig)
{
    if (BIO_puts(bp, "    Signature Algorithm: ") <= 0)
        return 0;
    if (i2a_ASN1_OBJECT(bp, sigalg->algorithm) <= 0)
        return 0;

    /* RSA-PSS signatures have parameters to print. */
    int sig_nid = OBJ_obj2nid(sigalg->algorithm);
    if (sig_nid == NID_rsassaPss &&
        !x509_print_rsa_pss_params(bp, sigalg, 9, 0)) {
        return 0;
    }

    if (sig)
        return X509_signature_dump(bp, sig, 9);
    else if (BIO_puts(bp, "\n") <= 0)
        return 0;
    return 1;
}

int ASN1_STRING_print(BIO *bp, const ASN1_STRING *v)
{
    int i, n;
    char buf[80];
    const char *p;

    if (v == NULL)
        return (0);
    n = 0;
    p = (const char *)v->data;
    for (i = 0; i < v->length; i++) {
        if ((p[i] > '~') || ((p[i] < ' ') &&
                             (p[i] != '\n') && (p[i] != '\r')))
            buf[n] = '.';
        else
            buf[n] = p[i];
        n++;
        if (n >= 80) {
            if (BIO_write(bp, buf, n) <= 0)
                return (0);
            n = 0;
        }
    }
    if (n > 0)
        if (BIO_write(bp, buf, 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 *const 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 = NULL;
    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);
}

// consume_two_digits is a helper function for ASN1_UTCTIME_print. If |*v|,
// assumed to be |*len| bytes long, has two leading digits, updates |*out| with
// their value, updates |v| and |len|, and returns one. Otherwise, returns
// zero.
static int consume_two_digits(int* out, const char **v, int *len) {
  if (*len < 2|| !isdigit((*v)[0]) || !isdigit((*v)[1])) {
    return 0;
  }
  *out = ((*v)[0] - '0') * 10 + ((*v)[1] - '0');
  *len -= 2;
  *v += 2;
  return 1;
}

// consume_zulu_timezone is a helper function for ASN1_UTCTIME_print. If |*v|,
// assumed to be |*len| bytes long, starts with "Z" then it updates |*v| and
// |*len| and returns one. Otherwise returns zero.
static int consume_zulu_timezone(const char **v, int *len) {
  if (*len == 0 || (*v)[0] != 'Z') {
    return 0;
  }

  *len -= 1;
  *v += 1;
  return 1;
}

int ASN1_UTCTIME_print(BIO *bp, const ASN1_UTCTIME *tm) {
  const char *v = (const char *)tm->data;
  int len = tm->length;
  int Y = 0, M = 0, D = 0, h = 0, m = 0, s = 0;

  // YYMMDDhhmm are required to be present.
  if (!consume_two_digits(&Y, &v, &len) ||
      !consume_two_digits(&M, &v, &len) ||
      !consume_two_digits(&D, &v, &len) ||
      !consume_two_digits(&h, &v, &len) ||
      !consume_two_digits(&m, &v, &len)) {
    goto err;
  }
  // https://tools.ietf.org/html/rfc5280, section 4.1.2.5.1, requires seconds
  // to be present, but historically this code has forgiven its absence.
  consume_two_digits(&s, &v, &len);

  // https://tools.ietf.org/html/rfc5280, section 4.1.2.5.1, specifies this
  // interpretation of the year.
  if (Y < 50) {
    Y += 2000;
  } else {
    Y += 1900;
  }
  if (M > 12 || M == 0) {
    goto err;
  }
  if (D > 31 || D == 0) {
    goto err;
  }
  if (h > 23 || m > 59 || s > 60) {
    goto err;
  }

  // https://tools.ietf.org/html/rfc5280, section 4.1.2.5.1, requires the "Z"
  // to be present, but historically this code has forgiven its absence.
  const int is_gmt = consume_zulu_timezone(&v, &len);

  // https://tools.ietf.org/html/rfc5280, section 4.1.2.5.1, does not permit
  // the specification of timezones using the +hhmm / -hhmm syntax, which is
  // the only other thing that might legitimately be found at the end.
  if (len) {
    goto err;
  }

  return BIO_printf(bp, "%s %2d %02d:%02d:%02d %d%s", mon[M - 1], D, h, m, s, Y,
                    is_gmt ? " GMT" : "") > 0;

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

int X509_NAME_print(BIO *bp, 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)
        return 0;
    if (!*b) {
        OPENSSL_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:
        OPENSSL_PUT_ERROR(X509, ERR_R_BUF_LIB);
    }
    OPENSSL_free(b);
    return (ret);
}
