| /******************************************************************************* |
| * This file contains main functions related to iSCSI Parameter negotiation. |
| * |
| * \u00a9 Copyright 2007-2011 RisingTide Systems LLC. |
| * |
| * Licensed to the Linux Foundation under the General Public License (GPL) version 2. |
| * |
| * Author: Nicholas A. Bellinger <nab@linux-iscsi.org> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| ******************************************************************************/ |
| |
| #include <linux/ctype.h> |
| #include <scsi/iscsi_proto.h> |
| #include <target/target_core_base.h> |
| #include <target/target_core_tpg.h> |
| |
| #include "iscsi_target_core.h" |
| #include "iscsi_target_parameters.h" |
| #include "iscsi_target_login.h" |
| #include "iscsi_target_nego.h" |
| #include "iscsi_target_tpg.h" |
| #include "iscsi_target_util.h" |
| #include "iscsi_target.h" |
| #include "iscsi_target_auth.h" |
| |
| #define MAX_LOGIN_PDUS 7 |
| #define TEXT_LEN 4096 |
| |
| void convert_null_to_semi(char *buf, int len) |
| { |
| int i; |
| |
| for (i = 0; i < len; i++) |
| if (buf[i] == '\0') |
| buf[i] = ';'; |
| } |
| |
| int strlen_semi(char *buf) |
| { |
| int i = 0; |
| |
| while (buf[i] != '\0') { |
| if (buf[i] == ';') |
| return i; |
| i++; |
| } |
| |
| return -1; |
| } |
| |
| int extract_param( |
| const char *in_buf, |
| const char *pattern, |
| unsigned int max_length, |
| char *out_buf, |
| unsigned char *type) |
| { |
| char *ptr; |
| int len; |
| |
| if (!in_buf || !pattern || !out_buf || !type) |
| return -1; |
| |
| ptr = strstr(in_buf, pattern); |
| if (!ptr) |
| return -1; |
| |
| ptr = strstr(ptr, "="); |
| if (!ptr) |
| return -1; |
| |
| ptr += 1; |
| if (*ptr == '0' && (*(ptr+1) == 'x' || *(ptr+1) == 'X')) { |
| ptr += 2; /* skip 0x */ |
| *type = HEX; |
| } else |
| *type = DECIMAL; |
| |
| len = strlen_semi(ptr); |
| if (len < 0) |
| return -1; |
| |
| if (len > max_length) { |
| pr_err("Length of input: %d exeeds max_length:" |
| " %d\n", len, max_length); |
| return -1; |
| } |
| memcpy(out_buf, ptr, len); |
| out_buf[len] = '\0'; |
| |
| return 0; |
| } |
| |
| static u32 iscsi_handle_authentication( |
| struct iscsi_conn *conn, |
| char *in_buf, |
| char *out_buf, |
| int in_length, |
| int *out_length, |
| unsigned char *authtype) |
| { |
| struct iscsi_session *sess = conn->sess; |
| struct iscsi_node_auth *auth; |
| struct iscsi_node_acl *iscsi_nacl; |
| struct se_node_acl *se_nacl; |
| |
| if (!sess->sess_ops->SessionType) { |
| /* |
| * For SessionType=Normal |
| */ |
| se_nacl = conn->sess->se_sess->se_node_acl; |
| if (!se_nacl) { |
| pr_err("Unable to locate struct se_node_acl for" |
| " CHAP auth\n"); |
| return -1; |
| } |
| iscsi_nacl = container_of(se_nacl, struct iscsi_node_acl, |
| se_node_acl); |
| if (!iscsi_nacl) { |
| pr_err("Unable to locate struct iscsi_node_acl for" |
| " CHAP auth\n"); |
| return -1; |
| } |
| |
| auth = ISCSI_NODE_AUTH(iscsi_nacl); |
| } else { |
| /* |
| * For SessionType=Discovery |
| */ |
| auth = &iscsit_global->discovery_acl.node_auth; |
| } |
| |
| if (strstr("CHAP", authtype)) |
| strcpy(conn->sess->auth_type, "CHAP"); |
| else |
| strcpy(conn->sess->auth_type, NONE); |
| |
| if (strstr("None", authtype)) |
| return 1; |
| #ifdef CANSRP |
| else if (strstr("SRP", authtype)) |
| return srp_main_loop(conn, auth, in_buf, out_buf, |
| &in_length, out_length); |
| #endif |
| else if (strstr("CHAP", authtype)) |
| return chap_main_loop(conn, auth, in_buf, out_buf, |
| &in_length, out_length); |
| else if (strstr("SPKM1", authtype)) |
| return 2; |
| else if (strstr("SPKM2", authtype)) |
| return 2; |
| else if (strstr("KRB5", authtype)) |
| return 2; |
| else |
| return 2; |
| } |
| |
| static void iscsi_remove_failed_auth_entry(struct iscsi_conn *conn) |
| { |
| kfree(conn->auth_protocol); |
| } |
| |
| static int iscsi_target_check_login_request( |
| struct iscsi_conn *conn, |
| struct iscsi_login *login) |
| { |
| int req_csg, req_nsg, rsp_csg, rsp_nsg; |
| 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); |
| |
| switch (login_req->opcode & ISCSI_OPCODE_MASK) { |
| case ISCSI_OP_LOGIN: |
| break; |
| default: |
| pr_err("Received unknown opcode 0x%02x.\n", |
| login_req->opcode & ISCSI_OPCODE_MASK); |
| iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, |
| ISCSI_LOGIN_STATUS_INIT_ERR); |
| return -1; |
| } |
| |
| if ((login_req->flags & ISCSI_FLAG_LOGIN_CONTINUE) && |
| (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) { |
| pr_err("Login request has both ISCSI_FLAG_LOGIN_CONTINUE" |
| " and ISCSI_FLAG_LOGIN_TRANSIT set, protocol error.\n"); |
| iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, |
| ISCSI_LOGIN_STATUS_INIT_ERR); |
| return -1; |
| } |
| |
| req_csg = (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) >> 2; |
| rsp_csg = (login_rsp->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) >> 2; |
| req_nsg = (login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK); |
| rsp_nsg = (login_rsp->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK); |
| |
| if (req_csg != login->current_stage) { |
| pr_err("Initiator unexpectedly changed login stage" |
| " from %d to %d, login failed.\n", login->current_stage, |
| req_csg); |
| iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, |
| ISCSI_LOGIN_STATUS_INIT_ERR); |
| return -1; |
| } |
| |
| if ((req_nsg == 2) || (req_csg >= 2) || |
| ((login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT) && |
| (req_nsg <= req_csg))) { |
| pr_err("Illegal login_req->flags Combination, CSG: %d," |
| " NSG: %d, ISCSI_FLAG_LOGIN_TRANSIT: %d.\n", req_csg, |
| req_nsg, (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)); |
| iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, |
| ISCSI_LOGIN_STATUS_INIT_ERR); |
| return -1; |
| } |
| |
| if ((login_req->max_version != login->version_max) || |
| (login_req->min_version != login->version_min)) { |
| pr_err("Login request changed Version Max/Nin" |
| " unexpectedly to 0x%02x/0x%02x, protocol error\n", |
| login_req->max_version, login_req->min_version); |
| iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, |
| ISCSI_LOGIN_STATUS_INIT_ERR); |
| return -1; |
| } |
| |
| if (memcmp(login_req->isid, login->isid, 6) != 0) { |
| pr_err("Login request changed ISID unexpectedly," |
| " protocol error.\n"); |
| iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, |
| ISCSI_LOGIN_STATUS_INIT_ERR); |
| return -1; |
| } |
| |
| if (login_req->itt != login->init_task_tag) { |
| pr_err("Login request changed ITT unexpectedly to" |
| " 0x%08x, protocol error.\n", login_req->itt); |
| iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, |
| ISCSI_LOGIN_STATUS_INIT_ERR); |
| return -1; |
| } |
| |
| if (payload_length > MAX_KEY_VALUE_PAIRS) { |
| pr_err("Login request payload exceeds default" |
| " MaxRecvDataSegmentLength: %u, protocol error.\n", |
| MAX_KEY_VALUE_PAIRS); |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| static int iscsi_target_check_first_request( |
| struct iscsi_conn *conn, |
| struct iscsi_login *login) |
| { |
| struct iscsi_param *param = NULL; |
| struct se_node_acl *se_nacl; |
| |
| login->first_request = 0; |
| |
| list_for_each_entry(param, &conn->param_list->param_list, p_list) { |
| if (!strncmp(param->name, SESSIONTYPE, 11)) { |
| if (!IS_PSTATE_ACCEPTOR(param)) { |
| 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); |
| return -1; |
| } |
| if (!strncmp(param->value, DISCOVERY, 9)) |
| return 0; |
| } |
| |
| if (!strncmp(param->name, INITIATORNAME, 13)) { |
| if (!IS_PSTATE_ACCEPTOR(param)) { |
| if (!login->leading_connection) |
| continue; |
| |
| 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); |
| return -1; |
| } |
| |
| /* |
| * For non-leading connections, double check that the |
| * received InitiatorName matches the existing session's |
| * struct iscsi_node_acl. |
| */ |
| if (!login->leading_connection) { |
| se_nacl = conn->sess->se_sess->se_node_acl; |
| if (!se_nacl) { |
| pr_err("Unable to locate" |
| " struct se_node_acl\n"); |
| iscsit_tx_login_rsp(conn, |
| ISCSI_STATUS_CLS_INITIATOR_ERR, |
| ISCSI_LOGIN_STATUS_TGT_NOT_FOUND); |
| return -1; |
| } |
| |
| if (strcmp(param->value, |
| se_nacl->initiatorname)) { |
| pr_err("Incorrect" |
| " InitiatorName: %s for this" |
| " iSCSI Initiator Node.\n", |
| param->value); |
| iscsit_tx_login_rsp(conn, |
| ISCSI_STATUS_CLS_INITIATOR_ERR, |
| ISCSI_LOGIN_STATUS_TGT_NOT_FOUND); |
| return -1; |
| } |
| } |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int iscsi_target_do_tx_login_io(struct iscsi_conn *conn, struct iscsi_login *login) |
| { |
| u32 padding = 0; |
| struct iscsi_session *sess = conn->sess; |
| struct iscsi_login_rsp *login_rsp; |
| |
| login_rsp = (struct iscsi_login_rsp *) login->rsp; |
| |
| login_rsp->opcode = ISCSI_OP_LOGIN_RSP; |
| hton24(login_rsp->dlength, login->rsp_length); |
| memcpy(login_rsp->isid, login->isid, 6); |
| login_rsp->tsih = cpu_to_be16(login->tsih); |
| login_rsp->itt = cpu_to_be32(login->init_task_tag); |
| login_rsp->statsn = cpu_to_be32(conn->stat_sn++); |
| login_rsp->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); |
| login_rsp->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); |
| |
| pr_debug("Sending Login Response, Flags: 0x%02x, ITT: 0x%08x," |
| " ExpCmdSN; 0x%08x, MaxCmdSN: 0x%08x, StatSN: 0x%08x, Length:" |
| " %u\n", login_rsp->flags, ntohl(login_rsp->itt), |
| ntohl(login_rsp->exp_cmdsn), ntohl(login_rsp->max_cmdsn), |
| ntohl(login_rsp->statsn), login->rsp_length); |
| |
| padding = ((-login->rsp_length) & 3); |
| |
| if (iscsi_login_tx_data( |
| conn, |
| login->rsp, |
| login->rsp_buf, |
| login->rsp_length + padding) < 0) |
| return -1; |
| |
| login->rsp_length = 0; |
| login_rsp->tsih = be16_to_cpu(login_rsp->tsih); |
| login_rsp->itt = be32_to_cpu(login_rsp->itt); |
| login_rsp->statsn = be32_to_cpu(login_rsp->statsn); |
| mutex_lock(&sess->cmdsn_mutex); |
| login_rsp->exp_cmdsn = be32_to_cpu(sess->exp_cmd_sn); |
| login_rsp->max_cmdsn = be32_to_cpu(sess->max_cmd_sn); |
| mutex_unlock(&sess->cmdsn_mutex); |
| |
| return 0; |
| } |
| |
| static int iscsi_target_do_rx_login_io(struct iscsi_conn *conn, struct iscsi_login *login) |
| { |
| u32 padding = 0, payload_length; |
| struct iscsi_login_req *login_req; |
| |
| if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0) |
| return -1; |
| |
| login_req = (struct iscsi_login_req *) login->req; |
| payload_length = ntoh24(login_req->dlength); |
| login_req->tsih = be16_to_cpu(login_req->tsih); |
| login_req->itt = be32_to_cpu(login_req->itt); |
| login_req->cid = be16_to_cpu(login_req->cid); |
| login_req->cmdsn = be32_to_cpu(login_req->cmdsn); |
| login_req->exp_statsn = be32_to_cpu(login_req->exp_statsn); |
| |
| pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x," |
| " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n", |
| login_req->flags, login_req->itt, login_req->cmdsn, |
| login_req->exp_statsn, login_req->cid, payload_length); |
| |
| if (iscsi_target_check_login_request(conn, login) < 0) |
| return -1; |
| |
| padding = ((-payload_length) & 3); |
| memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS); |
| |
| if (iscsi_login_rx_data( |
| conn, |
| login->req_buf, |
| payload_length + padding) < 0) |
| return -1; |
| |
| return 0; |
| } |
| |
| static int iscsi_target_do_login_io(struct iscsi_conn *conn, struct iscsi_login *login) |
| { |
| if (iscsi_target_do_tx_login_io(conn, login) < 0) |
| return -1; |
| |
| if (iscsi_target_do_rx_login_io(conn, login) < 0) |
| return -1; |
| |
| return 0; |
| } |
| |
| static int iscsi_target_get_initial_payload( |
| struct iscsi_conn *conn, |
| struct iscsi_login *login) |
| { |
| u32 padding = 0, payload_length; |
| struct iscsi_login_req *login_req; |
| |
| login_req = (struct iscsi_login_req *) login->req; |
| payload_length = ntoh24(login_req->dlength); |
| |
| pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x," |
| " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n", |
| login_req->flags, login_req->itt, login_req->cmdsn, |
| login_req->exp_statsn, payload_length); |
| |
| if (iscsi_target_check_login_request(conn, login) < 0) |
| return -1; |
| |
| padding = ((-payload_length) & 3); |
| |
| if (iscsi_login_rx_data( |
| conn, |
| login->req_buf, |
| payload_length + padding) < 0) |
| return -1; |
| |
| return 0; |
| } |
| |
| /* |
| * NOTE: We check for existing sessions or connections AFTER the initiator |
| * has been successfully authenticated in order to protect against faked |
| * ISID/TSIH combinations. |
| */ |
| static int iscsi_target_check_for_existing_instances( |
| struct iscsi_conn *conn, |
| struct iscsi_login *login) |
| { |
| if (login->checked_for_existing) |
| return 0; |
| |
| login->checked_for_existing = 1; |
| |
| if (!login->tsih) |
| return iscsi_check_for_session_reinstatement(conn); |
| else |
| return iscsi_login_post_auth_non_zero_tsih(conn, login->cid, |
| login->initial_exp_statsn); |
| } |
| |
| static int iscsi_target_do_authentication( |
| struct iscsi_conn *conn, |
| struct iscsi_login *login) |
| { |
| int authret; |
| 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; |
| |
| 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 sucessfully.\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 = (char *)¶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; |
| struct iscsi_targ_login_rsp *login_rsp; |
| u32 payload_length; |
| int sessiontype = 0, ret = 0; |
| |
| login_req = (struct iscsi_login_req *) login->req; |
| login_rsp = (struct iscsi_targ_login_rsp *) login->rsp; |
| 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 = kzalloc(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; |
| } |
| memcpy(login->req, login_pdu, ISCSI_HDR_LEN); |
| |
| 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) { |
| pr_err("iSCSI Login negotiation failed.\n"); |
| 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); |
| } |