/*

 * Copyright 2004-2018 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the OpenSSL license (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/crypto.h>

#include <openssl/buffer.h>

#include <openssl/x509.h>

#include <openssl/x509v3.h>

#include "crypto/x509.h"

#include "x509_local.h"

/* X509_VERIFY_PARAM functions */

#define SET_HOST 0

#define ADD_HOST 1

static char *str_copy(const char *s)

{

    return OPENSSL_strdup(s);

}

static void str_free(char *s)

{

    OPENSSL_free(s);

}

static int int_x509_param_set_hosts(X509_VERIFY_PARAM *vpm, int mode,

                                    const char *name, size_t namelen)

{

    char *copy;

    /*

     * Refuse names with embedded NUL bytes, except perhaps as final byte.

     * XXX: Do we need to push an error onto the error stack?

     */

    if (namelen == 0 || name == NULL)

        namelen = name ? strlen(name) : 0;

    else if (name && memchr(name, '\0', namelen > 1 ? namelen - 1 : namelen))

        return 0;

    if (namelen > 0 && name[namelen - 1] == '\0')

        --namelen;

    if (mode == SET_HOST) {

        sk_OPENSSL_STRING_pop_free(vpm->hosts, str_free);

        vpm->hosts = NULL;

    }

    if (name == NULL || namelen == 0)

        return 1;

    copy = OPENSSL_strndup(name, namelen);

    if (copy == NULL)

        return 0;

    if (vpm->hosts == NULL &&

        (vpm->hosts = sk_OPENSSL_STRING_new_null()) == NULL) {

        OPENSSL_free(copy);

        return 0;

    }

    if (!sk_OPENSSL_STRING_push(vpm->hosts, copy)) {

        OPENSSL_free(copy);

        if (sk_OPENSSL_STRING_num(vpm->hosts) == 0) {

            sk_OPENSSL_STRING_free(vpm->hosts);

            vpm->hosts = NULL;

        }

        return 0;

    }

    return 1;

}

X509_VERIFY_PARAM *X509_VERIFY_PARAM_new(void)

{

    X509_VERIFY_PARAM *param;

    param = OPENSSL_zalloc(sizeof(*param));

    if (param == NULL) {

        X509err(X509_F_X509_VERIFY_PARAM_NEW, ERR_R_MALLOC_FAILURE);

        return NULL;

    }

    param->trust = X509_TRUST_DEFAULT;

    /* param->inh_flags = X509_VP_FLAG_DEFAULT; */

    param->depth = -1;

    param->auth_level = -1; /* -1 means unset, 0 is explicit */

    return param;

}

void X509_VERIFY_PARAM_free(X509_VERIFY_PARAM *param)

{

    if (param == NULL)

        return;

    sk_ASN1_OBJECT_pop_free(param->policies, ASN1_OBJECT_free);

    sk_OPENSSL_STRING_pop_free(param->hosts, str_free);

    OPENSSL_free(param->peername);

    OPENSSL_free(param->email);

    OPENSSL_free(param->ip);

    OPENSSL_free(param);

}

/*-

 * This function determines how parameters are "inherited" from one structure

 * to another. There are several different ways this can happen.

 *

 * 1. If a child structure needs to have its values initialized from a parent

 *    they are simply copied across. For example SSL_CTX copied to SSL.

 * 2. If the structure should take on values only if they are currently unset.

 *    For example the values in an SSL structure will take appropriate value

 *    for SSL servers or clients but only if the application has not set new

 *    ones.

 *

 * The "inh_flags" field determines how this function behaves.

 *

 * Normally any values which are set in the default are not copied from the

 * destination and verify flags are ORed together.

 *

 * If X509_VP_FLAG_DEFAULT is set then anything set in the source is copied

 * to the destination. Effectively the values in "to" become default values

 * which will be used only if nothing new is set in "from".

 *

 * If X509_VP_FLAG_OVERWRITE is set then all value are copied across whether

 * they are set or not. Flags is still Ored though.

 *

 * If X509_VP_FLAG_RESET_FLAGS is set then the flags value is copied instead

 * of ORed.

 *

 * If X509_VP_FLAG_LOCKED is set then no values are copied.

 *

 * If X509_VP_FLAG_ONCE is set then the current inh_flags setting is zeroed

 * after the next call.

 */

/* Macro to test if a field should be copied from src to dest */

#define test_x509_verify_param_copy(field, def) \

        (to_overwrite || \

                ((src->field != def) && (to_default || (dest->field == def))))

/* Macro to test and copy a field if necessary */

#define x509_verify_param_copy(field, def) \

        if (test_x509_verify_param_copy(field, def)) \

                dest->field = src->field

int X509_VERIFY_PARAM_inherit(X509_VERIFY_PARAM *dest,

                              const X509_VERIFY_PARAM *src)

{

    unsigned long inh_flags;

    int to_default, to_overwrite;

    if (!src)

        return 1;

    inh_flags = dest->inh_flags | src->inh_flags;

    if (inh_flags & X509_VP_FLAG_ONCE)

        dest->inh_flags = 0;

    if (inh_flags & X509_VP_FLAG_LOCKED)

        return 1;

    if (inh_flags & X509_VP_FLAG_DEFAULT)

        to_default = 1;

    else

        to_default = 0;

    if (inh_flags & X509_VP_FLAG_OVERWRITE)

        to_overwrite = 1;

    else

        to_overwrite = 0;

    x509_verify_param_copy(purpose, 0);

    x509_verify_param_copy(trust, X509_TRUST_DEFAULT);

    x509_verify_param_copy(depth, -1);

    x509_verify_param_copy(auth_level, -1);

    /* If overwrite or check time not set, copy across */

    if (to_overwrite || !(dest->flags & X509_V_FLAG_USE_CHECK_TIME)) {

        dest->check_time = src->check_time;

        dest->flags &= ~X509_V_FLAG_USE_CHECK_TIME;

        /* Don't need to copy flag: that is done below */

    }

    if (inh_flags & X509_VP_FLAG_RESET_FLAGS)

        dest->flags = 0;

    dest->flags |= src->flags;

    if (test_x509_verify_param_copy(policies, NULL)) {

        if (!X509_VERIFY_PARAM_set1_policies(dest, src->policies))

            return 0;

    }

    /* Copy the host flags if and only if we're copying the host list */

    if (test_x509_verify_param_copy(hosts, NULL)) {

        sk_OPENSSL_STRING_pop_free(dest->hosts, str_free);

        dest->hosts = NULL;

        if (src->hosts) {

            dest->hosts =

                sk_OPENSSL_STRING_deep_copy(src->hosts, str_copy, str_free);

            if (dest->hosts == NULL)

                return 0;

            dest->hostflags = src->hostflags;

        }

    }

    if (test_x509_verify_param_copy(email, NULL)) {

        if (!X509_VERIFY_PARAM_set1_email(dest, src->email, src->emaillen))

            return 0;

    }

    if (test_x509_verify_param_copy(ip, NULL)) {

        if (!X509_VERIFY_PARAM_set1_ip(dest, src->ip, src->iplen))

            return 0;

    }

    return 1;

}

int X509_VERIFY_PARAM_set1(X509_VERIFY_PARAM *to,

                           const X509_VERIFY_PARAM *from)

{

    unsigned long save_flags = to->inh_flags;

    int ret;

    to->inh_flags |= X509_VP_FLAG_DEFAULT;

    ret = X509_VERIFY_PARAM_inherit(to, from);

    to->inh_flags = save_flags;

    return ret;

}

static int int_x509_param_set1(char **pdest, size_t *pdestlen,

                               const char *src, size_t srclen)

{

    void *tmp;

    if (src) {

        if (srclen == 0)

            srclen = strlen(src);

        tmp = OPENSSL_memdup(src, srclen);

        if (tmp == NULL)

            return 0;

    } else {

        tmp = NULL;

        srclen = 0;

    }

    OPENSSL_free(*pdest);

    *pdest = tmp;

    if (pdestlen != NULL)

        *pdestlen = srclen;

    return 1;

}

int X509_VERIFY_PARAM_set1_name(X509_VERIFY_PARAM *param, const char *name)

{

    OPENSSL_free(param->name);

    param->name = OPENSSL_strdup(name);

    if (param->name)

        return 1;

    return 0;

}

int X509_VERIFY_PARAM_set_flags(X509_VERIFY_PARAM *param, unsigned long flags)

{

    param->flags |= flags;

    if (flags & X509_V_FLAG_POLICY_MASK)

        param->flags |= X509_V_FLAG_POLICY_CHECK;

    return 1;

}

int X509_VERIFY_PARAM_clear_flags(X509_VERIFY_PARAM *param,

                                  unsigned long flags)

{

    param->flags &= ~flags;

    return 1;

}

unsigned long X509_VERIFY_PARAM_get_flags(X509_VERIFY_PARAM *param)

{

    return param->flags;

}

uint32_t X509_VERIFY_PARAM_get_inh_flags(const X509_VERIFY_PARAM *param)

{

    return param->inh_flags;

}

int X509_VERIFY_PARAM_set_inh_flags(X509_VERIFY_PARAM *param, uint32_t flags)

{

    param->inh_flags = flags;

    return 1;

}

int X509_VERIFY_PARAM_set_purpose(X509_VERIFY_PARAM *param, int purpose)

{

    return X509_PURPOSE_set(&param->purpose, purpose);

}

int X509_VERIFY_PARAM_set_trust(X509_VERIFY_PARAM *param, int trust)

{

    return X509_TRUST_set(&param->trust, trust);

}

void X509_VERIFY_PARAM_set_depth(X509_VERIFY_PARAM *param, int depth)

{

    param->depth = depth;

}

void X509_VERIFY_PARAM_set_auth_level(X509_VERIFY_PARAM *param, int auth_level)

{

    param->auth_level = auth_level;

}

time_t X509_VERIFY_PARAM_get_time(const X509_VERIFY_PARAM *param)

{

    return param->check_time;

}

void X509_VERIFY_PARAM_set_time(X509_VERIFY_PARAM *param, time_t t)

{

    param->check_time = t;

    param->flags |= X509_V_FLAG_USE_CHECK_TIME;

}

int X509_VERIFY_PARAM_add0_policy(X509_VERIFY_PARAM *param,

                                  ASN1_OBJECT *policy)

{

    if (!param->policies) {

        param->policies = sk_ASN1_OBJECT_new_null();

        if (!param->policies)

            return 0;

    }

    if (!sk_ASN1_OBJECT_push(param->policies, policy))

        return 0;

    return 1;

}

int X509_VERIFY_PARAM_set1_policies(X509_VERIFY_PARAM *param,

                                    STACK_OF(ASN1_OBJECT) *policies)

{

    int i;

    ASN1_OBJECT *oid, *doid;

    if (!param)

        return 0;

    sk_ASN1_OBJECT_pop_free(param->policies, ASN1_OBJECT_free);

    if (!policies) {

        param->policies = NULL;

        return 1;

    }

    param->policies = sk_ASN1_OBJECT_new_null();

    if (!param->policies)

        return 0;

    for (i = 0; i < sk_ASN1_OBJECT_num(policies); i++) {

        oid = sk_ASN1_OBJECT_value(policies, i);

        doid = OBJ_dup(oid);

        if (!doid)

            return 0;

        if (!sk_ASN1_OBJECT_push(param->policies, doid)) {

            ASN1_OBJECT_free(doid);

            return 0;

        }

    }

    param->flags |= X509_V_FLAG_POLICY_CHECK;

    return 1;

}

int X509_VERIFY_PARAM_set1_host(X509_VERIFY_PARAM *param,

                                const char *name, size_t namelen)

{

    return int_x509_param_set_hosts(param, SET_HOST, name, namelen);

}

int X509_VERIFY_PARAM_add1_host(X509_VERIFY_PARAM *param,

                                const char *name, size_t namelen)

{

    return int_x509_param_set_hosts(param, ADD_HOST, name, namelen);

}

void X509_VERIFY_PARAM_set_hostflags(X509_VERIFY_PARAM *param,

                                     unsigned int flags)

{

    param->hostflags = flags;

}

unsigned int X509_VERIFY_PARAM_get_hostflags(const X509_VERIFY_PARAM *param)

{

    return param->hostflags;

}

char *X509_VERIFY_PARAM_get0_peername(X509_VERIFY_PARAM *param)

{

    return param->peername;

}

/*

 * Move peername from one param structure to another, freeing any name present

 * at the target.  If the source is a NULL parameter structure, free and zero

 * the target peername.

 */

void X509_VERIFY_PARAM_move_peername(X509_VERIFY_PARAM *to,

                                     X509_VERIFY_PARAM *from)

{

    char *peername = (from != NULL) ? from->peername : NULL;

    if (to->peername != peername) {

        OPENSSL_free(to->peername);

        to->peername = peername;

    }

    if (from)

        from->peername = NULL;

}

int X509_VERIFY_PARAM_set1_email(X509_VERIFY_PARAM *param,

                                 const char *email, size_t emaillen)

{

    return int_x509_param_set1(&param->email, &param->emaillen,

                               email, emaillen);

}

int X509_VERIFY_PARAM_set1_ip(X509_VERIFY_PARAM *param,

                              const unsigned char *ip, size_t iplen)

{

    if (iplen != 0 && iplen != 4 && iplen != 16)

        return 0;

    return int_x509_param_set1((char **)&param->ip, &param->iplen,

                               (char *)ip, iplen);

}

int X509_VERIFY_PARAM_set1_ip_asc(X509_VERIFY_PARAM *param, const char *ipasc)

{

    unsigned char ipout[16];

    size_t iplen;

    iplen = (size_t)a2i_ipadd(ipout, ipasc);

    if (iplen == 0)

        return 0;

    return X509_VERIFY_PARAM_set1_ip(param, ipout, iplen);

}

int X509_VERIFY_PARAM_get_depth(const X509_VERIFY_PARAM *param)

{

    return param->depth;

}

int X509_VERIFY_PARAM_get_auth_level(const X509_VERIFY_PARAM *param)

{

    return param->auth_level;

}

const char *X509_VERIFY_PARAM_get0_name(const X509_VERIFY_PARAM *param)

{

    return param->name;

}

#define vpm_empty_id NULL, 0U, NULL, NULL, 0, NULL, 0

/*

 * Default verify parameters: these are used for various applications and can

 * be overridden by the user specified table. NB: the 'name' field *must* be

 * in alphabetical order because it will be searched using OBJ_search.

 */

static const X509_VERIFY_PARAM default_table[] = {

    {

     "default",                 /* X509 default parameters */

     0,                         /* Check time */

     0,                         /* internal flags */

     X509_V_FLAG_TRUSTED_FIRST, /* flags */

     0,                         /* purpose */

     0,                         /* trust */

     100,                       /* depth */

     -1,                        /* auth_level */

     NULL,                      /* policies */

     vpm_empty_id},

    {

     "pkcs7",                   /* S/MIME sign parameters */

     0,                         /* Check time */

     0,                         /* internal flags */

     0,                         /* flags */

     X509_PURPOSE_SMIME_SIGN,   /* purpose */

     X509_TRUST_EMAIL,          /* trust */

     -1,                        /* depth */

     -1,                        /* auth_level */

     NULL,                      /* policies */

     vpm_empty_id},

    {

     "smime_sign",              /* S/MIME sign parameters */

     0,                         /* Check time */

     0,                         /* internal flags */

     0,                         /* flags */

     X509_PURPOSE_SMIME_SIGN,   /* purpose */

     X509_TRUST_EMAIL,          /* trust */

     -1,                        /* depth */

     -1,                        /* auth_level */

     NULL,                      /* policies */

     vpm_empty_id},

    {

     "ssl_client",              /* SSL/TLS client parameters */

     0,                         /* Check time */

     0,                         /* internal flags */

     0,                         /* flags */

     X509_PURPOSE_SSL_CLIENT,   /* purpose */

     X509_TRUST_SSL_CLIENT,     /* trust */

     -1,                        /* depth */

     -1,                        /* auth_level */

     NULL,                      /* policies */

     vpm_empty_id},

    {

     "ssl_server",              /* SSL/TLS server parameters */

     0,                         /* Check time */

     0,                         /* internal flags */

     0,                         /* flags */

     X509_PURPOSE_SSL_SERVER,   /* purpose */

     X509_TRUST_SSL_SERVER,     /* trust */

     -1,                        /* depth */

     -1,                        /* auth_level */

     NULL,                      /* policies */

     vpm_empty_id}

};

static STACK_OF(X509_VERIFY_PARAM) *param_table = NULL;

static int table_cmp(const X509_VERIFY_PARAM *a, const X509_VERIFY_PARAM *b)

{

    return strcmp(a->name, b->name);

}

DECLARE_OBJ_BSEARCH_CMP_FN(X509_VERIFY_PARAM, X509_VERIFY_PARAM, table);

IMPLEMENT_OBJ_BSEARCH_CMP_FN(X509_VERIFY_PARAM, X509_VERIFY_PARAM, table);

static int param_cmp(const X509_VERIFY_PARAM *const *a,

                     const X509_VERIFY_PARAM *const *b)

{

    return strcmp((*a)->name, (*b)->name);

}

int X509_VERIFY_PARAM_add0_table(X509_VERIFY_PARAM *param)

{

    int idx;

    X509_VERIFY_PARAM *ptmp;

    if (param_table == NULL) {

        param_table = sk_X509_VERIFY_PARAM_new(param_cmp);

        if (param_table == NULL)

            return 0;

    } else {

        idx = sk_X509_VERIFY_PARAM_find(param_table, param);

        if (idx >= 0) {

            ptmp = sk_X509_VERIFY_PARAM_delete(param_table, idx);

            X509_VERIFY_PARAM_free(ptmp);

        }

    }

    if (!sk_X509_VERIFY_PARAM_push(param_table, param))

        return 0;

    return 1;

}

int X509_VERIFY_PARAM_get_count(void)

{

    int num = OSSL_NELEM(default_table);

    if (param_table)

        num += sk_X509_VERIFY_PARAM_num(param_table);

    return num;

}

const X509_VERIFY_PARAM *X509_VERIFY_PARAM_get0(int id)

{

    int num = OSSL_NELEM(default_table);

    if (id < num)

        return default_table + id;

    return sk_X509_VERIFY_PARAM_value(param_table, id - num);

}

const X509_VERIFY_PARAM *X509_VERIFY_PARAM_lookup(const char *name)

{

    int idx;

    X509_VERIFY_PARAM pm;

    pm.name = (char *)name;

    if (param_table != NULL) {

        idx = sk_X509_VERIFY_PARAM_find(param_table, &pm);

        if (idx >= 0)

            return sk_X509_VERIFY_PARAM_value(param_table, idx);

    }

    return OBJ_bsearch_table(&pm, default_table, OSSL_NELEM(default_table));

}

void X509_VERIFY_PARAM_table_cleanup(void)

{

    sk_X509_VERIFY_PARAM_pop_free(param_table, X509_VERIFY_PARAM_free);

    param_table = NULL;

}