v4_glue.c

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		      krb5_data *enc_data)
{
    krb5_error_code ret;
    krb5_storage *sp;

    krb5_data_zero(enc_data);

    sp = krb5_storage_emem();
    if (sp == NULL) {
	krb5_set_error_string(context, "malloc: out of memory");
	return ENOMEM;
    }
    krb5_storage_set_byteorder(sp, KRB5_STORAGE_BYTEORDER_BE);

    /* session key */
    ret = krb5_storage_write(sp,
			     session->keyvalue.data, 
			     session->keyvalue.length);
    if (ret != session->keyvalue.length) {
	ret = KRB4ET_INTK_PROT;
	goto error;
    }

    RCHECK(ret, put_nir(sp, service, instance, realm), error);
    RCHECK(ret, krb5_store_int8(sp, life), error);
    RCHECK(ret, krb5_store_int8(sp, kvno), error);
    RCHECK(ret, krb5_store_int8(sp, ticket->length), error);
    ret = krb5_storage_write(sp, ticket->data, ticket->length);
    if (ret != ticket->length) {
	ret = KRB4ET_INTK_PROT;
	goto error;
    }
    RCHECK(ret, krb5_store_int32(sp, kdc_time), error);

    ret = storage_to_etext(context, sp, key, enc_data);

 error:
    krb5_storage_free(sp);
    if (ret)
	krb5_set_error_string(context, "Failed to encode kerberos 4 ticket");

    return ret;
}

/*
 *
 */

krb5_error_code KRB5_LIB_FUNCTION
_krb5_krb_create_auth_reply(krb5_context context,
			    const char *pname,
			    const char *pinst,
			    const char *prealm,
			    int32_t time_ws,
			    int n,
			    uint32_t x_date,
			    unsigned char kvno,
			    const krb5_data *cipher,
			    krb5_data *data)
{
    krb5_error_code ret;
    krb5_storage *sp;

    krb5_data_zero(data);

    sp = krb5_storage_emem();
    if (sp == NULL) {
	krb5_set_error_string(context, "malloc: out of memory");
	return ENOMEM;
    }
    krb5_storage_set_byteorder(sp, KRB5_STORAGE_BYTEORDER_BE);

    RCHECK(ret, krb5_store_int8(sp, KRB_PROT_VERSION), error);
    RCHECK(ret, krb5_store_int8(sp, AUTH_MSG_KDC_REPLY), error);
    RCHECK(ret, put_nir(sp, pname, pinst, prealm), error);
    RCHECK(ret, krb5_store_int32(sp, time_ws), error);
    RCHECK(ret, krb5_store_int8(sp, n), error);
    RCHECK(ret, krb5_store_int32(sp, x_date), error);
    RCHECK(ret, krb5_store_int8(sp, kvno), error);
    RCHECK(ret, krb5_store_int16(sp, cipher->length), error);
    ret = krb5_storage_write(sp, cipher->data, cipher->length);
    if (ret != cipher->length) {
	ret = KRB4ET_INTK_PROT;
	goto error;
    }

    ret = krb5_storage_to_data(sp, data);

 error:
    krb5_storage_free(sp);
    if (ret)
	krb5_set_error_string(context, "Failed to encode kerberos 4 ticket");
	
    return ret;
}

/*
 *
 */

krb5_error_code KRB5_LIB_FUNCTION
_krb5_krb_cr_err_reply(krb5_context context,
		       const char *name,
		       const char *inst,
		       const char *realm,
		       uint32_t time_ws,
		       uint32_t e,
		       const char *e_string,
		       krb5_data *data)
{
    krb5_error_code ret;
    krb5_storage *sp;

    krb5_data_zero(data);

    if (name == NULL) name = "";
    if (inst == NULL) inst = "";
    if (realm == NULL) realm = "";
    if (e_string == NULL) e_string = "";

    sp = krb5_storage_emem();
    if (sp == NULL) {
	krb5_set_error_string(context, "malloc: out of memory");
	return ENOMEM;
    }
    krb5_storage_set_byteorder(sp, KRB5_STORAGE_BYTEORDER_BE);

    RCHECK(ret, krb5_store_int8(sp, KRB_PROT_VERSION), error);
    RCHECK(ret, krb5_store_int8(sp, AUTH_MSG_ERR_REPLY), error);
    RCHECK(ret, put_nir(sp, name, inst, realm), error);
    RCHECK(ret, krb5_store_int32(sp, time_ws), error);
    /* If it is a Kerberos 4 error-code, remove the et BASE */
    if (e >= ERROR_TABLE_BASE_krb && e <= ERROR_TABLE_BASE_krb + 255)
	e -= ERROR_TABLE_BASE_krb;
    RCHECK(ret, krb5_store_int32(sp, e), error);
    RCHECK(ret, krb5_store_stringz(sp, e_string), error);

    ret = krb5_storage_to_data(sp, data);

 error:
    krb5_storage_free(sp);
    if (ret)
	krb5_set_error_string(context, "Failed to encode kerberos 4 error");
	
    return 0;
}

static krb5_error_code
get_v4_stringz(krb5_storage *sp, char **str, size_t max_len)
{
    krb5_error_code ret;

    ret = krb5_ret_stringz(sp, str);
    if (ret)
	return ret;
    if (strlen(*str) > max_len) {
	free(*str);
	*str = NULL;
	return KRB4ET_INTK_PROT;
    }
    return 0;
}

/*
 *
 */

krb5_error_code KRB5_LIB_FUNCTION
_krb5_krb_decomp_ticket(krb5_context context,
			const krb5_data *enc_ticket,
			const krb5_keyblock *key,
			const char *local_realm,
			char **sname,
			char **sinstance,
			struct _krb5_krb_auth_data *ad)
{
    krb5_error_code ret;
    krb5_ssize_t size;
    krb5_storage *sp = NULL;
    krb5_data ticket;
    unsigned char des_key[8];

    memset(ad, 0, sizeof(*ad));
    krb5_data_zero(&ticket);

    *sname = NULL;
    *sinstance = NULL;

    RCHECK(ret, decrypt_etext(context, key, enc_ticket, &ticket), error);

    sp = krb5_storage_from_data(&ticket);
    if (sp == NULL) {
	krb5_data_free(&ticket);
	krb5_set_error_string(context, "alloc: out of memory");
	return ENOMEM;
    }

    krb5_storage_set_eof_code(sp, KRB4ET_INTK_PROT);

    RCHECK(ret, krb5_ret_int8(sp, &ad->k_flags), error);
    RCHECK(ret, get_v4_stringz(sp, &ad->pname, ANAME_SZ), error);
    RCHECK(ret, get_v4_stringz(sp, &ad->pinst, INST_SZ), error);
    RCHECK(ret, get_v4_stringz(sp, &ad->prealm, REALM_SZ), error);
    RCHECK(ret, krb5_ret_uint32(sp, &ad->address), error);
	
    size = krb5_storage_read(sp, des_key, sizeof(des_key));
    if (size != sizeof(des_key)) {
	ret = KRB4ET_INTK_PROT;
	goto error;
    }

    RCHECK(ret, krb5_ret_uint8(sp, &ad->life), error);

    if (ad->k_flags & 1)
	krb5_storage_set_byteorder(sp, KRB5_STORAGE_BYTEORDER_LE);
    else
	krb5_storage_set_byteorder(sp, KRB5_STORAGE_BYTEORDER_BE);

    RCHECK(ret, krb5_ret_uint32(sp, &ad->time_sec), error);

    RCHECK(ret, get_v4_stringz(sp, sname, ANAME_SZ), error);
    RCHECK(ret, get_v4_stringz(sp, sinstance, INST_SZ), error);

    ret = krb5_keyblock_init(context, ETYPE_DES_PCBC_NONE,
			     des_key, sizeof(des_key), &ad->session);
    if (ret)
	goto error;

    if (strlen(ad->prealm) == 0) {
	free(ad->prealm);
	ad->prealm = strdup(local_realm);
	if (ad->prealm == NULL) {
	    ret = ENOMEM;
	    goto error;
	}
    }

 error:
    memset(des_key, 0, sizeof(des_key));
    if (sp)
	krb5_storage_free(sp);
    krb5_data_free(&ticket);
    if (ret) {
	if (*sname) {
	    free(*sname);
	    *sname = NULL;
	}
	if (*sinstance) {
	    free(*sinstance);
	    *sinstance = NULL;
	}
	_krb5_krb_free_auth_data(context, ad);
	krb5_set_error_string(context, "Failed to decode v4 ticket");
    }
    return ret;
}

/*
 *
 */

krb5_error_code KRB5_LIB_FUNCTION
_krb5_krb_rd_req(krb5_context context,
		 krb5_data *authent,
		 const char *service,
		 const char *instance,
		 const char *local_realm,
		 int32_t from_addr,
		 const krb5_keyblock *key,
		 struct _krb5_krb_auth_data *ad)
{
    krb5_error_code ret;
    krb5_storage *sp;
    krb5_data ticket, eaut, aut;
    krb5_ssize_t size;
    int little_endian;
    int8_t pvno;
    int8_t type;
    int8_t s_kvno;
    uint8_t ticket_length;
    uint8_t eaut_length;
    uint8_t time_5ms;
    char *realm = NULL;
    char *sname = NULL;
    char *sinstance = NULL;
    char *r_realm = NULL;
    char *r_name = NULL;
    char *r_instance = NULL;

    uint32_t r_time_sec;	/* Coarse time from authenticator */
    unsigned long delta_t;      /* Time in authenticator - local time */
    long tkt_age;		/* Age of ticket */

    struct timeval tv;

    krb5_data_zero(&ticket);
    krb5_data_zero(&eaut);
    krb5_data_zero(&aut);

    sp = krb5_storage_from_data(authent);
    if (sp == NULL) {
	krb5_set_error_string(context, "alloc: out of memory");
	return ENOMEM;
    }

    krb5_storage_set_eof_code(sp, KRB4ET_INTK_PROT);

    ret = krb5_ret_int8(sp, &pvno);
    if (ret) {
	krb5_set_error_string(context, "Failed reading v4 pvno");
	goto error;
    }

    if (pvno != KRB_PROT_VERSION) {
	ret = KRB4ET_RD_AP_VERSION;
	krb5_set_error_string(context, "Failed v4 pvno not 4");
	goto error;
    }

    ret = krb5_ret_int8(sp, &type);
    if (ret) {
	krb5_set_error_string(context, "Failed readin v4 type");
	goto error;
    }

    little_endian = type & 1;
    type &= ~1;
    
    if(type != AUTH_MSG_APPL_REQUEST && type != AUTH_MSG_APPL_REQUEST_MUTUAL) {
	ret = KRB4ET_RD_AP_MSG_TYPE;
	krb5_set_error_string(context, "Not a valid v4 request type");
	goto error;
    }

    RCHECK(ret, krb5_ret_int8(sp, &s_kvno), error);
    RCHECK(ret, get_v4_stringz(sp, &realm, REALM_SZ), error);
    RCHECK(ret, krb5_ret_uint8(sp, &ticket_length), error);
    RCHECK(ret, krb5_ret_uint8(sp, &eaut_length), error);
    RCHECK(ret, krb5_data_alloc(&ticket, ticket_length), error);

    size = krb5_storage_read(sp, ticket.data, ticket.length);
    if (size != ticket.length) {
	ret = KRB4ET_INTK_PROT;
	krb5_set_error_string(context, "Failed reading v4 ticket");
	goto error;
    }

    /* Decrypt and take apart ticket */
    ret = _krb5_krb_decomp_ticket(context, &ticket, key, local_realm, 
				  &sname, &sinstance, ad);
    if (ret)
	goto error;

    RCHECK(ret, krb5_data_alloc(&eaut, eaut_length), error);

    size = krb5_storage_read(sp, eaut.data, eaut.length);
    if (size != eaut.length) {
	ret = KRB4ET_INTK_PROT;
	krb5_set_error_string(context, "Failed reading v4 authenticator");
	goto error;
    }

    krb5_storage_free(sp);
    sp = NULL;

    ret = decrypt_etext(context, &ad->session, &eaut, &aut);
    if (ret)
	goto error;

    sp = krb5_storage_from_data(&aut);
    if (sp == NULL) {
	ret = ENOMEM;
	krb5_set_error_string(context, "alloc: out of memory");
	goto error;
    }

    if (little_endian)
	krb5_storage_set_byteorder(sp, KRB5_STORAGE_BYTEORDER_LE);
    else
	krb5_storage_set_byteorder(sp, KRB5_STORAGE_BYTEORDER_BE);

    RCHECK(ret, get_v4_stringz(sp, &r_name, ANAME_SZ), error);
    RCHECK(ret, get_v4_stringz(sp, &r_instance, INST_SZ), error);
    RCHECK(ret, get_v4_stringz(sp, &r_realm, REALM_SZ), error);

    RCHECK(ret, krb5_ret_uint32(sp, &ad->checksum), error);
    RCHECK(ret, krb5_ret_uint8(sp, &time_5ms), error);
    RCHECK(ret, krb5_ret_uint32(sp, &r_time_sec), error);

    if (strcmp(ad->pname, r_name) != 0 ||
	strcmp(ad->pinst, r_instance) != 0 ||
	strcmp(ad->prealm, r_realm) != 0) {
	krb5_set_error_string(context, "v4 principal mismatch");
	ret = KRB4ET_RD_AP_INCON;
	goto error;
    }
    
    if (from_addr && ad->address && from_addr != ad->address) {
	krb5_set_error_string(context, "v4 bad address in ticket");
	ret = KRB4ET_RD_AP_BADD;
	goto error;
    }

    gettimeofday(&tv, NULL);
    delta_t = abs((int)(tv.tv_sec - r_time_sec));
    if (delta_t > CLOCK_SKEW) {
        ret = KRB4ET_RD_AP_TIME;
	krb5_set_error_string(context, "v4 clock skew");
	goto error;
    }

    /* Now check for expiration of ticket */

    tkt_age = tv.tv_sec - ad->time_sec;
    
    if ((tkt_age < 0) && (-tkt_age > CLOCK_SKEW)) {
        ret = KRB4ET_RD_AP_NYV;
	krb5_set_error_string(context, "v4 clock skew for expiration");
	goto error;
    }

    if (tv.tv_sec > _krb5_krb_life_to_time(ad->time_sec, ad->life)) {
	ret = KRB4ET_RD_AP_EXP;
	krb5_set_error_string(context, "v4 ticket expired");
	goto error;
    }

    ret = 0;
 error:
    krb5_data_free(&ticket);
    krb5_data_free(&eaut);
    krb5_data_free(&aut);
    if (realm)
	free(realm);
    if (sname)
	free(sname);
    if (sinstance)
	free(sinstance);
    if (r_name)
	free(r_name);
    if (r_instance)
	free(r_instance);
    if (r_realm)
	free(r_realm);
    if (sp)
	krb5_storage_free(sp);

    if (ret)
	krb5_clear_error_string(context);

    return ret;
}

/*
 *
 */

void KRB5_LIB_FUNCTION
_krb5_krb_free_auth_data(krb5_context context, struct _krb5_krb_auth_data *ad)
{
    if (ad->pname)
	free(ad->pname);
    if (ad->pinst)
	free(ad->pinst);
    if (ad->prealm)
	free(ad->prealm);
    krb5_free_keyblock_contents(context, &ad->session);
    memset(ad, 0, sizeof(*ad));
}