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path: root/drivers/target/iscsi/iscsi_target_nego.c
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-rw-r--r--drivers/target/iscsi/iscsi_target_nego.c1067
1 files changed, 1067 insertions, 0 deletions
diff --git a/drivers/target/iscsi/iscsi_target_nego.c b/drivers/target/iscsi/iscsi_target_nego.c
new file mode 100644
index 00000000000..713a4d23557
--- /dev/null
+++ b/drivers/target/iscsi/iscsi_target_nego.c
@@ -0,0 +1,1067 @@
+/*******************************************************************************
+ * 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 *)&param_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);
+ goto out;
+ }
+
+ 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);
+}