1060 lines
27 KiB
C
1060 lines
27 KiB
C
/*******************************************************************************
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* This file contains main functions related to iSCSI Parameter negotiation.
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*
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* \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
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*
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* Licensed to the Linux Foundation under the General Public License (GPL) version 2.
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*
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* Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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******************************************************************************/
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#include <linux/ctype.h>
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#include <scsi/iscsi_proto.h>
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#include <target/target_core_base.h>
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#include <target/target_core_fabric.h>
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#include "iscsi_target_core.h"
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#include "iscsi_target_parameters.h"
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#include "iscsi_target_login.h"
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#include "iscsi_target_nego.h"
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#include "iscsi_target_tpg.h"
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#include "iscsi_target_util.h"
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#include "iscsi_target.h"
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#include "iscsi_target_auth.h"
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#define MAX_LOGIN_PDUS 7
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#define TEXT_LEN 4096
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void convert_null_to_semi(char *buf, int len)
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{
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int i;
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for (i = 0; i < len; i++)
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if (buf[i] == '\0')
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buf[i] = ';';
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}
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int strlen_semi(char *buf)
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{
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int i = 0;
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while (buf[i] != '\0') {
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if (buf[i] == ';')
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return i;
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i++;
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}
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return -1;
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}
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int extract_param(
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const char *in_buf,
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const char *pattern,
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unsigned int max_length,
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char *out_buf,
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unsigned char *type)
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{
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char *ptr;
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int len;
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if (!in_buf || !pattern || !out_buf || !type)
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return -1;
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ptr = strstr(in_buf, pattern);
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if (!ptr)
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return -1;
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ptr = strstr(ptr, "=");
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if (!ptr)
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return -1;
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ptr += 1;
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if (*ptr == '0' && (*(ptr+1) == 'x' || *(ptr+1) == 'X')) {
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ptr += 2; /* skip 0x */
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*type = HEX;
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} else
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*type = DECIMAL;
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len = strlen_semi(ptr);
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if (len < 0)
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return -1;
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if (len > max_length) {
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pr_err("Length of input: %d exceeds max_length:"
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" %d\n", len, max_length);
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return -1;
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}
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memcpy(out_buf, ptr, len);
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out_buf[len] = '\0';
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return 0;
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}
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static u32 iscsi_handle_authentication(
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struct iscsi_conn *conn,
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char *in_buf,
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char *out_buf,
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int in_length,
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int *out_length,
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unsigned char *authtype)
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{
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struct iscsi_session *sess = conn->sess;
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struct iscsi_node_auth *auth;
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struct iscsi_node_acl *iscsi_nacl;
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struct se_node_acl *se_nacl;
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if (!sess->sess_ops->SessionType) {
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/*
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* For SessionType=Normal
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*/
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se_nacl = conn->sess->se_sess->se_node_acl;
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if (!se_nacl) {
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pr_err("Unable to locate struct se_node_acl for"
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" CHAP auth\n");
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return -1;
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}
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iscsi_nacl = container_of(se_nacl, struct iscsi_node_acl,
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se_node_acl);
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if (!iscsi_nacl) {
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pr_err("Unable to locate struct iscsi_node_acl for"
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" CHAP auth\n");
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return -1;
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}
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auth = ISCSI_NODE_AUTH(iscsi_nacl);
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} else {
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/*
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* For SessionType=Discovery
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*/
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auth = &iscsit_global->discovery_acl.node_auth;
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}
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if (strstr("CHAP", authtype))
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strcpy(conn->sess->auth_type, "CHAP");
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else
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strcpy(conn->sess->auth_type, NONE);
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if (strstr("None", authtype))
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return 1;
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#ifdef CANSRP
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else if (strstr("SRP", authtype))
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return srp_main_loop(conn, auth, in_buf, out_buf,
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&in_length, out_length);
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#endif
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else if (strstr("CHAP", authtype))
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return chap_main_loop(conn, auth, in_buf, out_buf,
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&in_length, out_length);
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else if (strstr("SPKM1", authtype))
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return 2;
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else if (strstr("SPKM2", authtype))
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return 2;
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else if (strstr("KRB5", authtype))
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return 2;
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else
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return 2;
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}
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static void iscsi_remove_failed_auth_entry(struct iscsi_conn *conn)
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{
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kfree(conn->auth_protocol);
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}
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static int iscsi_target_check_login_request(
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struct iscsi_conn *conn,
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struct iscsi_login *login)
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{
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int req_csg, req_nsg;
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u32 payload_length;
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struct iscsi_login_req *login_req;
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login_req = (struct iscsi_login_req *) login->req;
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payload_length = ntoh24(login_req->dlength);
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switch (login_req->opcode & ISCSI_OPCODE_MASK) {
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case ISCSI_OP_LOGIN:
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break;
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default:
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pr_err("Received unknown opcode 0x%02x.\n",
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login_req->opcode & ISCSI_OPCODE_MASK);
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iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
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ISCSI_LOGIN_STATUS_INIT_ERR);
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return -1;
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}
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if ((login_req->flags & ISCSI_FLAG_LOGIN_CONTINUE) &&
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(login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
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pr_err("Login request has both ISCSI_FLAG_LOGIN_CONTINUE"
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" and ISCSI_FLAG_LOGIN_TRANSIT set, protocol error.\n");
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iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
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ISCSI_LOGIN_STATUS_INIT_ERR);
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return -1;
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}
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req_csg = (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) >> 2;
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req_nsg = (login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK);
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if (req_csg != login->current_stage) {
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pr_err("Initiator unexpectedly changed login stage"
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" from %d to %d, login failed.\n", login->current_stage,
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req_csg);
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iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
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ISCSI_LOGIN_STATUS_INIT_ERR);
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return -1;
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}
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if ((req_nsg == 2) || (req_csg >= 2) ||
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((login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT) &&
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(req_nsg <= req_csg))) {
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pr_err("Illegal login_req->flags Combination, CSG: %d,"
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" NSG: %d, ISCSI_FLAG_LOGIN_TRANSIT: %d.\n", req_csg,
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req_nsg, (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT));
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iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
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ISCSI_LOGIN_STATUS_INIT_ERR);
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return -1;
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}
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if ((login_req->max_version != login->version_max) ||
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(login_req->min_version != login->version_min)) {
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pr_err("Login request changed Version Max/Nin"
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" unexpectedly to 0x%02x/0x%02x, protocol error\n",
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login_req->max_version, login_req->min_version);
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iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
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ISCSI_LOGIN_STATUS_INIT_ERR);
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return -1;
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}
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if (memcmp(login_req->isid, login->isid, 6) != 0) {
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pr_err("Login request changed ISID unexpectedly,"
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" protocol error.\n");
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iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
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ISCSI_LOGIN_STATUS_INIT_ERR);
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return -1;
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}
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if (login_req->itt != login->init_task_tag) {
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pr_err("Login request changed ITT unexpectedly to"
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" 0x%08x, protocol error.\n", login_req->itt);
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iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
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ISCSI_LOGIN_STATUS_INIT_ERR);
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return -1;
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}
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if (payload_length > MAX_KEY_VALUE_PAIRS) {
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pr_err("Login request payload exceeds default"
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" MaxRecvDataSegmentLength: %u, protocol error.\n",
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MAX_KEY_VALUE_PAIRS);
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return -1;
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}
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return 0;
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}
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static int iscsi_target_check_first_request(
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struct iscsi_conn *conn,
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struct iscsi_login *login)
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{
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struct iscsi_param *param = NULL;
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struct se_node_acl *se_nacl;
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login->first_request = 0;
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list_for_each_entry(param, &conn->param_list->param_list, p_list) {
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if (!strncmp(param->name, SESSIONTYPE, 11)) {
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if (!IS_PSTATE_ACCEPTOR(param)) {
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pr_err("SessionType key not received"
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" in first login request.\n");
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iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
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ISCSI_LOGIN_STATUS_MISSING_FIELDS);
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return -1;
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}
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if (!strncmp(param->value, DISCOVERY, 9))
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return 0;
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}
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if (!strncmp(param->name, INITIATORNAME, 13)) {
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if (!IS_PSTATE_ACCEPTOR(param)) {
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if (!login->leading_connection)
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continue;
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pr_err("InitiatorName key not received"
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" in first login request.\n");
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iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
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ISCSI_LOGIN_STATUS_MISSING_FIELDS);
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return -1;
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}
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/*
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* For non-leading connections, double check that the
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* received InitiatorName matches the existing session's
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* struct iscsi_node_acl.
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*/
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if (!login->leading_connection) {
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se_nacl = conn->sess->se_sess->se_node_acl;
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if (!se_nacl) {
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pr_err("Unable to locate"
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" struct se_node_acl\n");
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iscsit_tx_login_rsp(conn,
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ISCSI_STATUS_CLS_INITIATOR_ERR,
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ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
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return -1;
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}
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if (strcmp(param->value,
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se_nacl->initiatorname)) {
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pr_err("Incorrect"
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" InitiatorName: %s for this"
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" iSCSI Initiator Node.\n",
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param->value);
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iscsit_tx_login_rsp(conn,
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ISCSI_STATUS_CLS_INITIATOR_ERR,
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ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
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return -1;
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}
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}
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}
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}
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return 0;
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}
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static int iscsi_target_do_tx_login_io(struct iscsi_conn *conn, struct iscsi_login *login)
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{
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u32 padding = 0;
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struct iscsi_session *sess = conn->sess;
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struct iscsi_login_rsp *login_rsp;
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login_rsp = (struct iscsi_login_rsp *) login->rsp;
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login_rsp->opcode = ISCSI_OP_LOGIN_RSP;
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hton24(login_rsp->dlength, login->rsp_length);
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memcpy(login_rsp->isid, login->isid, 6);
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login_rsp->tsih = cpu_to_be16(login->tsih);
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login_rsp->itt = cpu_to_be32(login->init_task_tag);
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login_rsp->statsn = cpu_to_be32(conn->stat_sn++);
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login_rsp->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
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login_rsp->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
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pr_debug("Sending Login Response, Flags: 0x%02x, ITT: 0x%08x,"
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" ExpCmdSN; 0x%08x, MaxCmdSN: 0x%08x, StatSN: 0x%08x, Length:"
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" %u\n", login_rsp->flags, ntohl(login_rsp->itt),
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ntohl(login_rsp->exp_cmdsn), ntohl(login_rsp->max_cmdsn),
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ntohl(login_rsp->statsn), login->rsp_length);
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padding = ((-login->rsp_length) & 3);
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if (iscsi_login_tx_data(
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conn,
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login->rsp,
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login->rsp_buf,
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login->rsp_length + padding) < 0)
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return -1;
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login->rsp_length = 0;
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login_rsp->tsih = be16_to_cpu(login_rsp->tsih);
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login_rsp->itt = be32_to_cpu(login_rsp->itt);
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login_rsp->statsn = be32_to_cpu(login_rsp->statsn);
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mutex_lock(&sess->cmdsn_mutex);
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login_rsp->exp_cmdsn = be32_to_cpu(sess->exp_cmd_sn);
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login_rsp->max_cmdsn = be32_to_cpu(sess->max_cmd_sn);
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mutex_unlock(&sess->cmdsn_mutex);
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return 0;
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}
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static int iscsi_target_do_rx_login_io(struct iscsi_conn *conn, struct iscsi_login *login)
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{
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u32 padding = 0, payload_length;
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struct iscsi_login_req *login_req;
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if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0)
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return -1;
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login_req = (struct iscsi_login_req *) login->req;
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payload_length = ntoh24(login_req->dlength);
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login_req->tsih = be16_to_cpu(login_req->tsih);
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login_req->itt = be32_to_cpu(login_req->itt);
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login_req->cid = be16_to_cpu(login_req->cid);
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login_req->cmdsn = be32_to_cpu(login_req->cmdsn);
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login_req->exp_statsn = be32_to_cpu(login_req->exp_statsn);
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pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
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" CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
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login_req->flags, login_req->itt, login_req->cmdsn,
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login_req->exp_statsn, login_req->cid, payload_length);
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if (iscsi_target_check_login_request(conn, login) < 0)
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return -1;
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padding = ((-payload_length) & 3);
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memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
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if (iscsi_login_rx_data(
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conn,
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login->req_buf,
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payload_length + padding) < 0)
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return -1;
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return 0;
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}
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static int iscsi_target_do_login_io(struct iscsi_conn *conn, struct iscsi_login *login)
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{
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if (iscsi_target_do_tx_login_io(conn, login) < 0)
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return -1;
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if (iscsi_target_do_rx_login_io(conn, login) < 0)
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return -1;
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return 0;
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}
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static int iscsi_target_get_initial_payload(
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struct iscsi_conn *conn,
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struct iscsi_login *login)
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{
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u32 padding = 0, payload_length;
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struct iscsi_login_req *login_req;
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login_req = (struct iscsi_login_req *) login->req;
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payload_length = ntoh24(login_req->dlength);
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pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
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" CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
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login_req->flags, login_req->itt, login_req->cmdsn,
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login_req->exp_statsn, payload_length);
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if (iscsi_target_check_login_request(conn, login) < 0)
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return -1;
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padding = ((-payload_length) & 3);
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|
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if (iscsi_login_rx_data(
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conn,
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login->req_buf,
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payload_length + padding) < 0)
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return -1;
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|
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return 0;
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}
|
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|
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/*
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* NOTE: We check for existing sessions or connections AFTER the initiator
|
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* has been successfully authenticated in order to protect against faked
|
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* ISID/TSIH combinations.
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*/
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static int iscsi_target_check_for_existing_instances(
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struct iscsi_conn *conn,
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struct iscsi_login *login)
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{
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if (login->checked_for_existing)
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return 0;
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login->checked_for_existing = 1;
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|
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if (!login->tsih)
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return iscsi_check_for_session_reinstatement(conn);
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else
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return iscsi_login_post_auth_non_zero_tsih(conn, login->cid,
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login->initial_exp_statsn);
|
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}
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|
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static int iscsi_target_do_authentication(
|
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struct iscsi_conn *conn,
|
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struct iscsi_login *login)
|
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{
|
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int authret;
|
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u32 payload_length;
|
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struct iscsi_param *param;
|
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struct iscsi_login_req *login_req;
|
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struct iscsi_login_rsp *login_rsp;
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|
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login_req = (struct iscsi_login_req *) login->req;
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login_rsp = (struct iscsi_login_rsp *) login->rsp;
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|
payload_length = ntoh24(login_req->dlength);
|
|
|
|
param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
|
|
if (!param)
|
|
return -1;
|
|
|
|
authret = iscsi_handle_authentication(
|
|
conn,
|
|
login->req_buf,
|
|
login->rsp_buf,
|
|
payload_length,
|
|
&login->rsp_length,
|
|
param->value);
|
|
switch (authret) {
|
|
case 0:
|
|
pr_debug("Received OK response"
|
|
" from LIO Authentication, continuing.\n");
|
|
break;
|
|
case 1:
|
|
pr_debug("iSCSI security negotiation"
|
|
" completed successfully.\n");
|
|
login->auth_complete = 1;
|
|
if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
|
|
(login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
|
|
login_rsp->flags |= (ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
|
|
ISCSI_FLAG_LOGIN_TRANSIT);
|
|
login->current_stage = 1;
|
|
}
|
|
return iscsi_target_check_for_existing_instances(
|
|
conn, login);
|
|
case 2:
|
|
pr_err("Security negotiation"
|
|
" failed.\n");
|
|
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
|
|
ISCSI_LOGIN_STATUS_AUTH_FAILED);
|
|
return -1;
|
|
default:
|
|
pr_err("Received unknown error %d from LIO"
|
|
" Authentication\n", authret);
|
|
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
|
|
ISCSI_LOGIN_STATUS_TARGET_ERROR);
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int iscsi_target_handle_csg_zero(
|
|
struct iscsi_conn *conn,
|
|
struct iscsi_login *login)
|
|
{
|
|
int ret;
|
|
u32 payload_length;
|
|
struct iscsi_param *param;
|
|
struct iscsi_login_req *login_req;
|
|
struct iscsi_login_rsp *login_rsp;
|
|
|
|
login_req = (struct iscsi_login_req *) login->req;
|
|
login_rsp = (struct iscsi_login_rsp *) login->rsp;
|
|
payload_length = ntoh24(login_req->dlength);
|
|
|
|
param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
|
|
if (!param)
|
|
return -1;
|
|
|
|
ret = iscsi_decode_text_input(
|
|
PHASE_SECURITY|PHASE_DECLARATIVE,
|
|
SENDER_INITIATOR|SENDER_RECEIVER,
|
|
login->req_buf,
|
|
payload_length,
|
|
conn->param_list);
|
|
if (ret < 0)
|
|
return -1;
|
|
|
|
if (ret > 0) {
|
|
if (login->auth_complete) {
|
|
pr_err("Initiator has already been"
|
|
" successfully authenticated, but is still"
|
|
" sending %s keys.\n", param->value);
|
|
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
|
|
ISCSI_LOGIN_STATUS_INIT_ERR);
|
|
return -1;
|
|
}
|
|
|
|
goto do_auth;
|
|
}
|
|
|
|
if (login->first_request)
|
|
if (iscsi_target_check_first_request(conn, login) < 0)
|
|
return -1;
|
|
|
|
ret = iscsi_encode_text_output(
|
|
PHASE_SECURITY|PHASE_DECLARATIVE,
|
|
SENDER_TARGET,
|
|
login->rsp_buf,
|
|
&login->rsp_length,
|
|
conn->param_list);
|
|
if (ret < 0)
|
|
return -1;
|
|
|
|
if (!iscsi_check_negotiated_keys(conn->param_list)) {
|
|
if (ISCSI_TPG_ATTRIB(ISCSI_TPG_C(conn))->authentication &&
|
|
!strncmp(param->value, NONE, 4)) {
|
|
pr_err("Initiator sent AuthMethod=None but"
|
|
" Target is enforcing iSCSI Authentication,"
|
|
" login failed.\n");
|
|
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
|
|
ISCSI_LOGIN_STATUS_AUTH_FAILED);
|
|
return -1;
|
|
}
|
|
|
|
if (ISCSI_TPG_ATTRIB(ISCSI_TPG_C(conn))->authentication &&
|
|
!login->auth_complete)
|
|
return 0;
|
|
|
|
if (strncmp(param->value, NONE, 4) && !login->auth_complete)
|
|
return 0;
|
|
|
|
if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
|
|
(login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
|
|
login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
|
|
ISCSI_FLAG_LOGIN_TRANSIT;
|
|
login->current_stage = 1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
do_auth:
|
|
return iscsi_target_do_authentication(conn, login);
|
|
}
|
|
|
|
static int iscsi_target_handle_csg_one(struct iscsi_conn *conn, struct iscsi_login *login)
|
|
{
|
|
int ret;
|
|
u32 payload_length;
|
|
struct iscsi_login_req *login_req;
|
|
struct iscsi_login_rsp *login_rsp;
|
|
|
|
login_req = (struct iscsi_login_req *) login->req;
|
|
login_rsp = (struct iscsi_login_rsp *) login->rsp;
|
|
payload_length = ntoh24(login_req->dlength);
|
|
|
|
ret = iscsi_decode_text_input(
|
|
PHASE_OPERATIONAL|PHASE_DECLARATIVE,
|
|
SENDER_INITIATOR|SENDER_RECEIVER,
|
|
login->req_buf,
|
|
payload_length,
|
|
conn->param_list);
|
|
if (ret < 0)
|
|
return -1;
|
|
|
|
if (login->first_request)
|
|
if (iscsi_target_check_first_request(conn, login) < 0)
|
|
return -1;
|
|
|
|
if (iscsi_target_check_for_existing_instances(conn, login) < 0)
|
|
return -1;
|
|
|
|
ret = iscsi_encode_text_output(
|
|
PHASE_OPERATIONAL|PHASE_DECLARATIVE,
|
|
SENDER_TARGET,
|
|
login->rsp_buf,
|
|
&login->rsp_length,
|
|
conn->param_list);
|
|
if (ret < 0)
|
|
return -1;
|
|
|
|
if (!login->auth_complete &&
|
|
ISCSI_TPG_ATTRIB(ISCSI_TPG_C(conn))->authentication) {
|
|
pr_err("Initiator is requesting CSG: 1, has not been"
|
|
" successfully authenticated, and the Target is"
|
|
" enforcing iSCSI Authentication, login failed.\n");
|
|
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
|
|
ISCSI_LOGIN_STATUS_AUTH_FAILED);
|
|
return -1;
|
|
}
|
|
|
|
if (!iscsi_check_negotiated_keys(conn->param_list))
|
|
if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE3) &&
|
|
(login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT))
|
|
login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE3 |
|
|
ISCSI_FLAG_LOGIN_TRANSIT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int iscsi_target_do_login(struct iscsi_conn *conn, struct iscsi_login *login)
|
|
{
|
|
int pdu_count = 0;
|
|
struct iscsi_login_req *login_req;
|
|
struct iscsi_login_rsp *login_rsp;
|
|
|
|
login_req = (struct iscsi_login_req *) login->req;
|
|
login_rsp = (struct iscsi_login_rsp *) login->rsp;
|
|
|
|
while (1) {
|
|
if (++pdu_count > MAX_LOGIN_PDUS) {
|
|
pr_err("MAX_LOGIN_PDUS count reached.\n");
|
|
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
|
|
ISCSI_LOGIN_STATUS_TARGET_ERROR);
|
|
return -1;
|
|
}
|
|
|
|
switch ((login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) >> 2) {
|
|
case 0:
|
|
login_rsp->flags |= (0 & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK);
|
|
if (iscsi_target_handle_csg_zero(conn, login) < 0)
|
|
return -1;
|
|
break;
|
|
case 1:
|
|
login_rsp->flags |= ISCSI_FLAG_LOGIN_CURRENT_STAGE1;
|
|
if (iscsi_target_handle_csg_one(conn, login) < 0)
|
|
return -1;
|
|
if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
|
|
login->tsih = conn->sess->tsih;
|
|
if (iscsi_target_do_tx_login_io(conn,
|
|
login) < 0)
|
|
return -1;
|
|
return 0;
|
|
}
|
|
break;
|
|
default:
|
|
pr_err("Illegal CSG: %d received from"
|
|
" Initiator, protocol error.\n",
|
|
(login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
|
|
>> 2);
|
|
break;
|
|
}
|
|
|
|
if (iscsi_target_do_login_io(conn, login) < 0)
|
|
return -1;
|
|
|
|
if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
|
|
login_rsp->flags &= ~ISCSI_FLAG_LOGIN_TRANSIT;
|
|
login_rsp->flags &= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void iscsi_initiatorname_tolower(
|
|
char *param_buf)
|
|
{
|
|
char *c;
|
|
u32 iqn_size = strlen(param_buf), i;
|
|
|
|
for (i = 0; i < iqn_size; i++) {
|
|
c = ¶m_buf[i];
|
|
if (!isupper(*c))
|
|
continue;
|
|
|
|
*c = tolower(*c);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Processes the first Login Request..
|
|
*/
|
|
static int iscsi_target_locate_portal(
|
|
struct iscsi_np *np,
|
|
struct iscsi_conn *conn,
|
|
struct iscsi_login *login)
|
|
{
|
|
char *i_buf = NULL, *s_buf = NULL, *t_buf = NULL;
|
|
char *tmpbuf, *start = NULL, *end = NULL, *key, *value;
|
|
struct iscsi_session *sess = conn->sess;
|
|
struct iscsi_tiqn *tiqn;
|
|
struct iscsi_login_req *login_req;
|
|
u32 payload_length;
|
|
int sessiontype = 0, ret = 0;
|
|
|
|
login_req = (struct iscsi_login_req *) login->req;
|
|
payload_length = ntoh24(login_req->dlength);
|
|
|
|
login->first_request = 1;
|
|
login->leading_connection = (!login_req->tsih) ? 1 : 0;
|
|
login->current_stage =
|
|
(login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) >> 2;
|
|
login->version_min = login_req->min_version;
|
|
login->version_max = login_req->max_version;
|
|
memcpy(login->isid, login_req->isid, 6);
|
|
login->cmd_sn = login_req->cmdsn;
|
|
login->init_task_tag = login_req->itt;
|
|
login->initial_exp_statsn = login_req->exp_statsn;
|
|
login->cid = login_req->cid;
|
|
login->tsih = login_req->tsih;
|
|
|
|
if (iscsi_target_get_initial_payload(conn, login) < 0)
|
|
return -1;
|
|
|
|
tmpbuf = kzalloc(payload_length + 1, GFP_KERNEL);
|
|
if (!tmpbuf) {
|
|
pr_err("Unable to allocate memory for tmpbuf.\n");
|
|
return -1;
|
|
}
|
|
|
|
memcpy(tmpbuf, login->req_buf, payload_length);
|
|
tmpbuf[payload_length] = '\0';
|
|
start = tmpbuf;
|
|
end = (start + payload_length);
|
|
|
|
/*
|
|
* Locate the initial keys expected from the Initiator node in
|
|
* the first login request in order to progress with the login phase.
|
|
*/
|
|
while (start < end) {
|
|
if (iscsi_extract_key_value(start, &key, &value) < 0) {
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
|
|
if (!strncmp(key, "InitiatorName", 13))
|
|
i_buf = value;
|
|
else if (!strncmp(key, "SessionType", 11))
|
|
s_buf = value;
|
|
else if (!strncmp(key, "TargetName", 10))
|
|
t_buf = value;
|
|
|
|
start += strlen(key) + strlen(value) + 2;
|
|
}
|
|
|
|
/*
|
|
* See 5.3. Login Phase.
|
|
*/
|
|
if (!i_buf) {
|
|
pr_err("InitiatorName key not received"
|
|
" in first login request.\n");
|
|
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
|
|
ISCSI_LOGIN_STATUS_MISSING_FIELDS);
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
/*
|
|
* Convert the incoming InitiatorName to lowercase following
|
|
* RFC-3720 3.2.6.1. section c) that says that iSCSI IQNs
|
|
* are NOT case sensitive.
|
|
*/
|
|
iscsi_initiatorname_tolower(i_buf);
|
|
|
|
if (!s_buf) {
|
|
if (!login->leading_connection)
|
|
goto get_target;
|
|
|
|
pr_err("SessionType key not received"
|
|
" in first login request.\n");
|
|
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
|
|
ISCSI_LOGIN_STATUS_MISSING_FIELDS);
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Use default portal group for discovery sessions.
|
|
*/
|
|
sessiontype = strncmp(s_buf, DISCOVERY, 9);
|
|
if (!sessiontype) {
|
|
conn->tpg = iscsit_global->discovery_tpg;
|
|
if (!login->leading_connection)
|
|
goto get_target;
|
|
|
|
sess->sess_ops->SessionType = 1;
|
|
/*
|
|
* Setup crc32c modules from libcrypto
|
|
*/
|
|
if (iscsi_login_setup_crypto(conn) < 0) {
|
|
pr_err("iscsi_login_setup_crypto() failed\n");
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
/*
|
|
* Serialize access across the discovery struct iscsi_portal_group to
|
|
* process login attempt.
|
|
*/
|
|
if (iscsit_access_np(np, conn->tpg) < 0) {
|
|
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
|
|
ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
get_target:
|
|
if (!t_buf) {
|
|
pr_err("TargetName key not received"
|
|
" in first login request while"
|
|
" SessionType=Normal.\n");
|
|
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
|
|
ISCSI_LOGIN_STATUS_MISSING_FIELDS);
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Locate Target IQN from Storage Node.
|
|
*/
|
|
tiqn = iscsit_get_tiqn_for_login(t_buf);
|
|
if (!tiqn) {
|
|
pr_err("Unable to locate Target IQN: %s in"
|
|
" Storage Node\n", t_buf);
|
|
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
|
|
ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
pr_debug("Located Storage Object: %s\n", tiqn->tiqn);
|
|
|
|
/*
|
|
* Locate Target Portal Group from Storage Node.
|
|
*/
|
|
conn->tpg = iscsit_get_tpg_from_np(tiqn, np);
|
|
if (!conn->tpg) {
|
|
pr_err("Unable to locate Target Portal Group"
|
|
" on %s\n", tiqn->tiqn);
|
|
iscsit_put_tiqn_for_login(tiqn);
|
|
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
|
|
ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt);
|
|
/*
|
|
* Setup crc32c modules from libcrypto
|
|
*/
|
|
if (iscsi_login_setup_crypto(conn) < 0) {
|
|
pr_err("iscsi_login_setup_crypto() failed\n");
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
/*
|
|
* Serialize access across the struct iscsi_portal_group to
|
|
* process login attempt.
|
|
*/
|
|
if (iscsit_access_np(np, conn->tpg) < 0) {
|
|
iscsit_put_tiqn_for_login(tiqn);
|
|
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
|
|
ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
|
|
ret = -1;
|
|
conn->tpg = NULL;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* conn->sess->node_acl will be set when the referenced
|
|
* struct iscsi_session is located from received ISID+TSIH in
|
|
* iscsi_login_non_zero_tsih_s2().
|
|
*/
|
|
if (!login->leading_connection) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* This value is required in iscsi_login_zero_tsih_s2()
|
|
*/
|
|
sess->sess_ops->SessionType = 0;
|
|
|
|
/*
|
|
* Locate incoming Initiator IQN reference from Storage Node.
|
|
*/
|
|
sess->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
|
|
&conn->tpg->tpg_se_tpg, i_buf);
|
|
if (!sess->se_sess->se_node_acl) {
|
|
pr_err("iSCSI Initiator Node: %s is not authorized to"
|
|
" access iSCSI target portal group: %hu.\n",
|
|
i_buf, conn->tpg->tpgt);
|
|
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
|
|
ISCSI_LOGIN_STATUS_TGT_FORBIDDEN);
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
|
|
ret = 0;
|
|
out:
|
|
kfree(tmpbuf);
|
|
return ret;
|
|
}
|
|
|
|
struct iscsi_login *iscsi_target_init_negotiation(
|
|
struct iscsi_np *np,
|
|
struct iscsi_conn *conn,
|
|
char *login_pdu)
|
|
{
|
|
struct iscsi_login *login;
|
|
|
|
login = kzalloc(sizeof(struct iscsi_login), GFP_KERNEL);
|
|
if (!login) {
|
|
pr_err("Unable to allocate memory for struct iscsi_login.\n");
|
|
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
|
|
ISCSI_LOGIN_STATUS_NO_RESOURCES);
|
|
return NULL;
|
|
}
|
|
|
|
login->req = kmemdup(login_pdu, ISCSI_HDR_LEN, GFP_KERNEL);
|
|
if (!login->req) {
|
|
pr_err("Unable to allocate memory for Login Request.\n");
|
|
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
|
|
ISCSI_LOGIN_STATUS_NO_RESOURCES);
|
|
goto out;
|
|
}
|
|
|
|
login->req_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
|
|
if (!login->req_buf) {
|
|
pr_err("Unable to allocate memory for response buffer.\n");
|
|
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
|
|
ISCSI_LOGIN_STATUS_NO_RESOURCES);
|
|
goto out;
|
|
}
|
|
/*
|
|
* SessionType: Discovery
|
|
*
|
|
* Locates Default Portal
|
|
*
|
|
* SessionType: Normal
|
|
*
|
|
* Locates Target Portal from NP -> Target IQN
|
|
*/
|
|
if (iscsi_target_locate_portal(np, conn, login) < 0) {
|
|
goto out;
|
|
}
|
|
|
|
return login;
|
|
out:
|
|
kfree(login->req);
|
|
kfree(login->req_buf);
|
|
kfree(login);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
int iscsi_target_start_negotiation(
|
|
struct iscsi_login *login,
|
|
struct iscsi_conn *conn)
|
|
{
|
|
int ret = -1;
|
|
|
|
login->rsp = kzalloc(ISCSI_HDR_LEN, GFP_KERNEL);
|
|
if (!login->rsp) {
|
|
pr_err("Unable to allocate memory for"
|
|
" Login Response.\n");
|
|
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
|
|
ISCSI_LOGIN_STATUS_NO_RESOURCES);
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
|
|
login->rsp_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
|
|
if (!login->rsp_buf) {
|
|
pr_err("Unable to allocate memory for"
|
|
" request buffer.\n");
|
|
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
|
|
ISCSI_LOGIN_STATUS_NO_RESOURCES);
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
|
|
ret = iscsi_target_do_login(conn, login);
|
|
out:
|
|
if (ret != 0)
|
|
iscsi_remove_failed_auth_entry(conn);
|
|
|
|
iscsi_target_nego_release(login, conn);
|
|
return ret;
|
|
}
|
|
|
|
void iscsi_target_nego_release(
|
|
struct iscsi_login *login,
|
|
struct iscsi_conn *conn)
|
|
{
|
|
kfree(login->req);
|
|
kfree(login->rsp);
|
|
kfree(login->req_buf);
|
|
kfree(login->rsp_buf);
|
|
kfree(login);
|
|
}
|