/*

 * Copyright 1999-2021 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 "crypto/x509.h"

#include <openssl/conf.h>

#include <openssl/x509v3.h>

#include <openssl/bio.h>

#include "ext_dat.h"

static GENERAL_NAMES *v2i_subject_alt(X509V3_EXT_METHOD *method,

                                      X509V3_CTX *ctx,

                                      STACK_OF(CONF_VALUE) *nval);

static GENERAL_NAMES *v2i_issuer_alt(X509V3_EXT_METHOD *method,

                                     X509V3_CTX *ctx,

                                     STACK_OF(CONF_VALUE) *nval);

static int copy_email(X509V3_CTX *ctx, GENERAL_NAMES *gens, int move_p);

static int copy_issuer(X509V3_CTX *ctx, GENERAL_NAMES *gens);

static int do_othername(GENERAL_NAME *gen, const char *value, X509V3_CTX *ctx);

static int do_dirname(GENERAL_NAME *gen, const char *value, X509V3_CTX *ctx);

const X509V3_EXT_METHOD ossl_v3_alt[3] = {

    {NID_subject_alt_name, 0, ASN1_ITEM_ref(GENERAL_NAMES),

     0, 0, 0, 0,

     0, 0,

     (X509V3_EXT_I2V) i2v_GENERAL_NAMES,

     (X509V3_EXT_V2I)v2i_subject_alt,

     NULL, NULL, NULL},

    {NID_issuer_alt_name, 0, ASN1_ITEM_ref(GENERAL_NAMES),

     0, 0, 0, 0,

     0, 0,

     (X509V3_EXT_I2V) i2v_GENERAL_NAMES,

     (X509V3_EXT_V2I)v2i_issuer_alt,

     NULL, NULL, NULL},

    {NID_certificate_issuer, 0, ASN1_ITEM_ref(GENERAL_NAMES),

     0, 0, 0, 0,

     0, 0,

     (X509V3_EXT_I2V) i2v_GENERAL_NAMES,

     NULL, NULL, NULL, NULL},

};

STACK_OF(CONF_VALUE) *i2v_GENERAL_NAMES(X509V3_EXT_METHOD *method,

                                        GENERAL_NAMES *gens,

                                        STACK_OF(CONF_VALUE) *ret)

{

    int i;

    GENERAL_NAME *gen;

    STACK_OF(CONF_VALUE) *tmpret = NULL, *origret = ret;

    for (i = 0; i < sk_GENERAL_NAME_num(gens); i++) {

        gen = sk_GENERAL_NAME_value(gens, i);

        /*

         * i2v_GENERAL_NAME allocates ret if it is NULL. If something goes

         * wrong we need to free the stack - but only if it was empty when we

         * originally entered this function.

         */

        tmpret = i2v_GENERAL_NAME(method, gen, ret);

        if (tmpret == NULL) {

            if (origret == NULL)

                sk_CONF_VALUE_pop_free(ret, X509V3_conf_free);

            return NULL;

        }

        ret = tmpret;

    }

    if (ret == NULL)

        return sk_CONF_VALUE_new_null();

    return ret;

}

STACK_OF(CONF_VALUE) *i2v_GENERAL_NAME(X509V3_EXT_METHOD *method,

                                       GENERAL_NAME *gen,

                                       STACK_OF(CONF_VALUE) *ret)

{

    char othername[300];

    char oline[256], *tmp;

    switch (gen->type) {

    case GEN_OTHERNAME:

        switch (OBJ_obj2nid(gen->d.otherName->type_id)) {

        case NID_id_on_SmtpUTF8Mailbox:

            if (gen->d.otherName->value->type != V_ASN1_UTF8STRING

                    || !x509v3_add_len_value_uchar("othername: SmtpUTF8Mailbox:",

                            gen->d.otherName->value->value.utf8string->data,

                            gen->d.otherName->value->value.utf8string->length,

                            &ret))

                return NULL;

            break;

        case NID_XmppAddr:

            if (gen->d.otherName->value->type != V_ASN1_UTF8STRING

                    || !x509v3_add_len_value_uchar("othername: XmppAddr:",

                            gen->d.otherName->value->value.utf8string->data,

                            gen->d.otherName->value->value.utf8string->length,

                            &ret))

                return NULL;

            break;

        case NID_SRVName:

            if (gen->d.otherName->value->type != V_ASN1_IA5STRING

                    || !x509v3_add_len_value_uchar("othername: SRVName:",

                            gen->d.otherName->value->value.ia5string->data,

                            gen->d.otherName->value->value.ia5string->length,

                            &ret))

                return NULL;

            break;

        case NID_ms_upn:

            if (gen->d.otherName->value->type != V_ASN1_UTF8STRING

                    || !x509v3_add_len_value_uchar("othername: UPN:",

                            gen->d.otherName->value->value.utf8string->data,

                            gen->d.otherName->value->value.utf8string->length,

                            &ret))

                return NULL;

            break;

        case NID_NAIRealm:

            if (gen->d.otherName->value->type != V_ASN1_UTF8STRING

                    || !x509v3_add_len_value_uchar("othername: NAIRealm:",

                            gen->d.otherName->value->value.utf8string->data,

                            gen->d.otherName->value->value.utf8string->length,

                            &ret))

                return NULL;

            break;

        default:

            if (OBJ_obj2txt(oline, sizeof(oline), gen->d.otherName->type_id, 0) > 0) 

                BIO_snprintf(othername, sizeof(othername), "othername: %s:",

                             oline);

            else

                OPENSSL_strlcpy(othername, "othername:", sizeof(othername));

            /* check if the value is something printable */

            if (gen->d.otherName->value->type == V_ASN1_IA5STRING) {

                if (x509v3_add_len_value_uchar(othername,

                             gen->d.otherName->value->value.ia5string->data,

                             gen->d.otherName->value->value.ia5string->length,

                             &ret)) 

                    return ret;

            }

            if (gen->d.otherName->value->type == V_ASN1_UTF8STRING) {

                if (x509v3_add_len_value_uchar(othername,

                             gen->d.otherName->value->value.utf8string->data,

                             gen->d.otherName->value->value.utf8string->length,

                             &ret)) 

                    return ret;

            }

            if (!X509V3_add_value(othername, "<unsupported>", &ret))

                return NULL;

            break;

        }

        break;

    case GEN_X400:

        if (!X509V3_add_value("X400Name", "<unsupported>", &ret))

            return NULL;

        break;

    case GEN_EDIPARTY:

        if (!X509V3_add_value("EdiPartyName", "<unsupported>", &ret))

            return NULL;

        break;

    case GEN_EMAIL:

        if (!x509v3_add_len_value_uchar("email", gen->d.ia5->data,

                                        gen->d.ia5->length, &ret))

            return NULL;

        break;

    case GEN_DNS:

        if (!x509v3_add_len_value_uchar("DNS", gen->d.ia5->data,

                                        gen->d.ia5->length, &ret))

            return NULL;

        break;

    case GEN_URI:

        if (!x509v3_add_len_value_uchar("URI", gen->d.ia5->data,

                                        gen->d.ia5->length, &ret))

            return NULL;

        break;

    case GEN_DIRNAME:

        if (X509_NAME_oneline(gen->d.dirn, oline, sizeof(oline)) == NULL

                || !X509V3_add_value("DirName", oline, &ret))

            return NULL;

        break;

    case GEN_IPADD:

        tmp = ossl_ipaddr_to_asc(gen->d.ip->data, gen->d.ip->length);

        if (tmp == NULL || !X509V3_add_value("IP Address", tmp, &ret))

            ret = NULL;

        OPENSSL_free(tmp);

        break;

    case GEN_RID:

        i2t_ASN1_OBJECT(oline, 256, gen->d.rid);

        if (!X509V3_add_value("Registered ID", oline, &ret))

            return NULL;

        break;

    }

    return ret;

}

int GENERAL_NAME_print(BIO *out, GENERAL_NAME *gen)

{

    char *tmp;

    int nid;

    switch (gen->type) {

    case GEN_OTHERNAME:

        nid = OBJ_obj2nid(gen->d.otherName->type_id);

        /* Validate the types are as we expect before we use them */

        if ((nid == NID_SRVName

             && gen->d.otherName->value->type != V_ASN1_IA5STRING)

                || (nid != NID_SRVName

                    && gen->d.otherName->value->type != V_ASN1_UTF8STRING)) {

            BIO_printf(out, "othername:<unsupported>");

            break;

        }

        switch (nid) {

        case NID_id_on_SmtpUTF8Mailbox:

            BIO_printf(out, "othername:SmtpUTF8Mailbox:%.*s",

                       gen->d.otherName->value->value.utf8string->length,

                       gen->d.otherName->value->value.utf8string->data);

            break;

        case NID_XmppAddr:

            BIO_printf(out, "othername:XmppAddr:%.*s",

                       gen->d.otherName->value->value.utf8string->length,

                       gen->d.otherName->value->value.utf8string->data);

            break;

        case NID_SRVName:

            BIO_printf(out, "othername:SRVName:%.*s",

                       gen->d.otherName->value->value.ia5string->length,

                       gen->d.otherName->value->value.ia5string->data);

            break;

        case NID_ms_upn:

            BIO_printf(out, "othername:UPN:%.*s",

                       gen->d.otherName->value->value.utf8string->length,

                       gen->d.otherName->value->value.utf8string->data);

            break;

        case NID_NAIRealm:

            BIO_printf(out, "othername:NAIRealm:%.*s",

                       gen->d.otherName->value->value.utf8string->length,

                       gen->d.otherName->value->value.utf8string->data);

            break;

        default:

            BIO_printf(out, "othername:<unsupported>");

            break;

        }

        break;

    case GEN_X400:

        BIO_printf(out, "X400Name:<unsupported>");

        break;

    case GEN_EDIPARTY:

        /* Maybe fix this: it is supported now */

        BIO_printf(out, "EdiPartyName:<unsupported>");

        break;

    case GEN_EMAIL:

        BIO_printf(out, "email:");

        ASN1_STRING_print(out, gen->d.ia5);

        break;

    case GEN_DNS:

        BIO_printf(out, "DNS:");

        ASN1_STRING_print(out, gen->d.ia5);

        break;

    case GEN_URI:

        BIO_printf(out, "URI:");

        ASN1_STRING_print(out, gen->d.ia5);

        break;

    case GEN_DIRNAME:

        BIO_printf(out, "DirName:");

        X509_NAME_print_ex(out, gen->d.dirn, 0, XN_FLAG_ONELINE);

        break;

    case GEN_IPADD:

        tmp = ossl_ipaddr_to_asc(gen->d.ip->data, gen->d.ip->length);

        if (tmp == NULL)

            return 0;

        BIO_printf(out, "IP Address:%s", tmp);

        OPENSSL_free(tmp);

        break;

    case GEN_RID:

        BIO_printf(out, "Registered ID:");

        i2a_ASN1_OBJECT(out, gen->d.rid);

        break;

    }

    return 1;

}

static GENERAL_NAMES *v2i_issuer_alt(X509V3_EXT_METHOD *method,

                                     X509V3_CTX *ctx,

                                     STACK_OF(CONF_VALUE) *nval)

{

    const int num = sk_CONF_VALUE_num(nval);

    GENERAL_NAMES *gens = sk_GENERAL_NAME_new_reserve(NULL, num);

    int i;

    if (gens == NULL) {

        ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);

        sk_GENERAL_NAME_free(gens);

        return NULL;

    }

    for (i = 0; i < num; i++) {

        CONF_VALUE *cnf = sk_CONF_VALUE_value(nval, i);

        if (!ossl_v3_name_cmp(cnf->name, "issuer")

            && cnf->value && strcmp(cnf->value, "copy") == 0) {

            if (!copy_issuer(ctx, gens))

                goto err;

        } else {

            GENERAL_NAME *gen = v2i_GENERAL_NAME(method, ctx, cnf);

            if (gen == NULL)

                goto err;

            sk_GENERAL_NAME_push(gens, gen); /* no failure as it was reserved */

        }

    }

    return gens;

 err:

    sk_GENERAL_NAME_pop_free(gens, GENERAL_NAME_free);

    return NULL;

}

/* Append subject altname of issuer to issuer alt name of subject */

static int copy_issuer(X509V3_CTX *ctx, GENERAL_NAMES *gens)

{

    GENERAL_NAMES *ialt;

    GENERAL_NAME *gen;

    X509_EXTENSION *ext;

    int i, num;

    if (ctx != NULL && (ctx->flags & X509V3_CTX_TEST) != 0)

        return 1;

    if (!ctx || !ctx->issuer_cert) {

        ERR_raise(ERR_LIB_X509V3, X509V3_R_NO_ISSUER_DETAILS);

        goto err;

    }

    i = X509_get_ext_by_NID(ctx->issuer_cert, NID_subject_alt_name, -1);

    if (i < 0)

        return 1;

    if ((ext = X509_get_ext(ctx->issuer_cert, i)) == NULL

        || (ialt = X509V3_EXT_d2i(ext)) == NULL) {

        ERR_raise(ERR_LIB_X509V3, X509V3_R_ISSUER_DECODE_ERROR);

        goto err;

    }

    num = sk_GENERAL_NAME_num(ialt);

    if (!sk_GENERAL_NAME_reserve(gens, num)) {

        ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);

        goto err;

    }

    for (i = 0; i < num; i++) {

        gen = sk_GENERAL_NAME_value(ialt, i);

        sk_GENERAL_NAME_push(gens, gen);     /* no failure as it was reserved */

    }

    sk_GENERAL_NAME_free(ialt);

    return 1;

 err:

    return 0;

}

static GENERAL_NAMES *v2i_subject_alt(X509V3_EXT_METHOD *method,

                                      X509V3_CTX *ctx,

                                      STACK_OF(CONF_VALUE) *nval)

{

    GENERAL_NAMES *gens;

    CONF_VALUE *cnf;

    const int num = sk_CONF_VALUE_num(nval);

    int i;

    gens = sk_GENERAL_NAME_new_reserve(NULL, num);

    if (gens == NULL) {

        ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);

        sk_GENERAL_NAME_free(gens);

        return NULL;

    }

    for (i = 0; i < num; i++) {

        cnf = sk_CONF_VALUE_value(nval, i);

        if (ossl_v3_name_cmp(cnf->name, "email") == 0

            && cnf->value && strcmp(cnf->value, "copy") == 0) {

            if (!copy_email(ctx, gens, 0))

                goto err;

        } else if (ossl_v3_name_cmp(cnf->name, "email") == 0

                   && cnf->value && strcmp(cnf->value, "move") == 0) {

            if (!copy_email(ctx, gens, 1))

                goto err;

        } else {

            GENERAL_NAME *gen;

            if ((gen = v2i_GENERAL_NAME(method, ctx, cnf)) == NULL)

                goto err;

            sk_GENERAL_NAME_push(gens, gen); /* no failure as it was reserved */

        }

    }

    return gens;

 err:

    sk_GENERAL_NAME_pop_free(gens, GENERAL_NAME_free);

    return NULL;

}

/*

 * Copy any email addresses in a certificate or request to GENERAL_NAMES

 */

static int copy_email(X509V3_CTX *ctx, GENERAL_NAMES *gens, int move_p)

{

    X509_NAME *nm;

    ASN1_IA5STRING *email = NULL;

    X509_NAME_ENTRY *ne;

    GENERAL_NAME *gen = NULL;

    int i = -1;

    if (ctx != NULL && (ctx->flags & X509V3_CTX_TEST) != 0)

        return 1;

    if (ctx == NULL

        || (ctx->subject_cert == NULL && ctx->subject_req == NULL)) {

        ERR_raise(ERR_LIB_X509V3, X509V3_R_NO_SUBJECT_DETAILS);

        return 0;

    }

    /* Find the subject name */

    nm = ctx->subject_cert != NULL ?

        X509_get_subject_name(ctx->subject_cert) :

        X509_REQ_get_subject_name(ctx->subject_req);

    /* Now add any email address(es) to STACK */

    while ((i = X509_NAME_get_index_by_NID(nm,

                                           NID_pkcs9_emailAddress, i)) >= 0) {

        ne = X509_NAME_get_entry(nm, i);

        email = ASN1_STRING_dup(X509_NAME_ENTRY_get_data(ne));

        if (move_p) {

            X509_NAME_delete_entry(nm, i);

            X509_NAME_ENTRY_free(ne);

            i--;

        }

        if (email == NULL || (gen = GENERAL_NAME_new()) == NULL) {

            ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);

            goto err;

        }

        gen->d.ia5 = email;

        email = NULL;

        gen->type = GEN_EMAIL;

        if (!sk_GENERAL_NAME_push(gens, gen)) {

            ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);

            goto err;

        }

        gen = NULL;

    }

    return 1;

 err:

    GENERAL_NAME_free(gen);

    ASN1_IA5STRING_free(email);

    return 0;

}

GENERAL_NAMES *v2i_GENERAL_NAMES(const X509V3_EXT_METHOD *method,

                                 X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *nval)

{

    GENERAL_NAME *gen;

    GENERAL_NAMES *gens;

    CONF_VALUE *cnf;

    const int num = sk_CONF_VALUE_num(nval);

    int i;

    gens = sk_GENERAL_NAME_new_reserve(NULL, num);

    if (gens == NULL) {

        ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);

        sk_GENERAL_NAME_free(gens);

        return NULL;

    }

    for (i = 0; i < num; i++) {

        cnf = sk_CONF_VALUE_value(nval, i);

        if ((gen = v2i_GENERAL_NAME(method, ctx, cnf)) == NULL)

            goto err;

        sk_GENERAL_NAME_push(gens, gen);    /* no failure as it was reserved */

    }

    return gens;

 err:

    sk_GENERAL_NAME_pop_free(gens, GENERAL_NAME_free);

    return NULL;

}

GENERAL_NAME *v2i_GENERAL_NAME(const X509V3_EXT_METHOD *method,

                               X509V3_CTX *ctx, CONF_VALUE *cnf)

{

    return v2i_GENERAL_NAME_ex(NULL, method, ctx, cnf, 0);

}

GENERAL_NAME *a2i_GENERAL_NAME(GENERAL_NAME *out,

                               const X509V3_EXT_METHOD *method,

                               X509V3_CTX *ctx, int gen_type, const char *value,

                               int is_nc)

{

    char is_string = 0;

    GENERAL_NAME *gen = NULL;

    if (!value) {

        ERR_raise(ERR_LIB_X509V3, X509V3_R_MISSING_VALUE);

        return NULL;

    }

    if (out)

        gen = out;

    else {

        gen = GENERAL_NAME_new();

        if (gen == NULL) {

            ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);

            return NULL;

        }

    }

    switch (gen_type) {

    case GEN_URI:

    case GEN_EMAIL:

    case GEN_DNS:

        is_string = 1;

        break;

    case GEN_RID:

        {

            ASN1_OBJECT *obj;

            if ((obj = OBJ_txt2obj(value, 0)) == NULL) {

                ERR_raise_data(ERR_LIB_X509V3, X509V3_R_BAD_OBJECT,

                               "value=%s", value);

                goto err;

            }

            gen->d.rid = obj;

        }

        break;

    case GEN_IPADD:

        if (is_nc)

            gen->d.ip = a2i_IPADDRESS_NC(value);

        else

            gen->d.ip = a2i_IPADDRESS(value);

        if (gen->d.ip == NULL) {

            ERR_raise_data(ERR_LIB_X509V3, X509V3_R_BAD_IP_ADDRESS,

                           "value=%s", value);

            goto err;

        }

        break;

    case GEN_DIRNAME:

        if (!do_dirname(gen, value, ctx)) {

            ERR_raise(ERR_LIB_X509V3, X509V3_R_DIRNAME_ERROR);

            goto err;

        }

        break;

    case GEN_OTHERNAME:

        if (!do_othername(gen, value, ctx)) {

            ERR_raise(ERR_LIB_X509V3, X509V3_R_OTHERNAME_ERROR);

            goto err;

        }

        break;

    default:

        ERR_raise(ERR_LIB_X509V3, X509V3_R_UNSUPPORTED_TYPE);

        goto err;

    }

    if (is_string) {

        if ((gen->d.ia5 = ASN1_IA5STRING_new()) == NULL ||

            !ASN1_STRING_set(gen->d.ia5, (unsigned char *)value,

                             strlen(value))) {

            ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);

            goto err;

        }

    }

    gen->type = gen_type;

    return gen;

 err:

    if (!out)

        GENERAL_NAME_free(gen);

    return NULL;

}

GENERAL_NAME *v2i_GENERAL_NAME_ex(GENERAL_NAME *out,

                                  const X509V3_EXT_METHOD *method,

                                  X509V3_CTX *ctx, CONF_VALUE *cnf, int is_nc)

{

    int type;

    char *name, *value;

    name = cnf->name;

    value = cnf->value;

    if (!value) {

        ERR_raise(ERR_LIB_X509V3, X509V3_R_MISSING_VALUE);

        return NULL;

    }

    if (!ossl_v3_name_cmp(name, "email"))

        type = GEN_EMAIL;

    else if (!ossl_v3_name_cmp(name, "URI"))

        type = GEN_URI;

    else if (!ossl_v3_name_cmp(name, "DNS"))

        type = GEN_DNS;

    else if (!ossl_v3_name_cmp(name, "RID"))

        type = GEN_RID;

    else if (!ossl_v3_name_cmp(name, "IP"))

        type = GEN_IPADD;

    else if (!ossl_v3_name_cmp(name, "dirName"))

        type = GEN_DIRNAME;

    else if (!ossl_v3_name_cmp(name, "otherName"))

        type = GEN_OTHERNAME;

    else {

        ERR_raise_data(ERR_LIB_X509V3, X509V3_R_UNSUPPORTED_OPTION,

                       "name=%s", name);

        return NULL;

    }

    return a2i_GENERAL_NAME(out, method, ctx, type, value, is_nc);

}

static int do_othername(GENERAL_NAME *gen, const char *value, X509V3_CTX *ctx)

{

    char *objtmp = NULL, *p;

    int objlen;

    if ((p = strchr(value, ';')) == NULL)

        return 0;

    if ((gen->d.otherName = OTHERNAME_new()) == NULL)

        return 0;

    /*

     * Free this up because we will overwrite it. no need to free type_id

     * because it is static

     */

    ASN1_TYPE_free(gen->d.otherName->value);

    if ((gen->d.otherName->value = ASN1_generate_v3(p + 1, ctx)) == NULL)

        return 0;

    objlen = p - value;

    objtmp = OPENSSL_strndup(value, objlen);

    if (objtmp == NULL)

        return 0;

    gen->d.otherName->type_id = OBJ_txt2obj(objtmp, 0);

    OPENSSL_free(objtmp);

    if (!gen->d.otherName->type_id)

        return 0;

    return 1;

}

static int do_dirname(GENERAL_NAME *gen, const char *value, X509V3_CTX *ctx)

{

    int ret = 0;

    STACK_OF(CONF_VALUE) *sk = NULL;

    X509_NAME *nm;

    if ((nm = X509_NAME_new()) == NULL)

        goto err;

    sk = X509V3_get_section(ctx, value);

    if (!sk) {

        ERR_raise_data(ERR_LIB_X509V3, X509V3_R_SECTION_NOT_FOUND,

                       "section=%s", value);

        goto err;

    }

    /* FIXME: should allow other character types... */

    ret = X509V3_NAME_from_section(nm, sk, MBSTRING_ASC);

    if (!ret)

        goto err;

    gen->d.dirn = nm;

err:

    if (ret == 0)

        X509_NAME_free(nm);

    X509V3_section_free(ctx, sk);

    return ret;

}