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package ipmi
import (
"context"
"fmt"
)
// 13.22 RAKP Message 3
type RAKPMessage3 struct {
// Selected by remote console. Used by remote console to help match
// responses up with requests.
MessageTag uint8
// Identifies the status of the previous message.
RmcpStatusCode RmcpStatusCode
// The Managed System's Session ID for this session, returned by the managed system on the previous RMCP+ Open Session Response message.
ManagedSystemSessionID uint32
// An integrity check value over the relevant items specified by the RAKP
// authentication algorithm identified in RAKP Message 1.
// The size of this field depends on the specific authentication algorithm.
//
// This field may be 0 bytes (absent) for some algorithms (e.g. RAKP-none).
KeyExchangeAuthenticationCode []byte
}
type RAKPMessage4 struct {
authAlg AuthAlg
MessageTag uint8
RmcpStatusCode RmcpStatusCode
MgmtConsoleSessionID uint32
// An integrity check value over the relevant items specified by
// the RAKP authentication algorithm that was identified in RAKP Message 1.
//
// The size of this field depends on the specific authentication algorithm.
//
// For example, the RAKP-HMAC-SHA1 specifies that an HMACSHA1-96 algorithm be used for calculating this field.
// See Section 13.28
// Authentication, Integrity, and Confidentiality Algorithm Numbers for info on
// the algorithm to be used for this field.
//
// This field may be 0 bytes (absent) for some authentication algorithms (e.g. RAKP-none)
IntegrityCheckValue []byte
}
func (req *RAKPMessage3) Command() Command {
return CommandNone
}
func (req *RAKPMessage3) Pack() []byte {
var msg = make([]byte, 8+len(req.KeyExchangeAuthenticationCode))
packUint8(req.MessageTag, msg, 0)
packUint8(uint8(req.RmcpStatusCode), msg, 1)
packUint16(0, msg, 2) // reserved
packUint32L(req.ManagedSystemSessionID, msg, 4)
packBytes(req.KeyExchangeAuthenticationCode, msg, 8)
return msg
}
func (res *RAKPMessage4) Unpack(msg []byte) error {
authCodeLen := 0
switch res.authAlg {
case AuthAlgRAKP_None:
// nothing need to do
case AuthAlgRAKP_HMAC_MD5:
// need to copy 16 bytes
authCodeLen = 16
case AuthAlgRAKP_HMAC_SHA1:
// need to copy 12 bytes
authCodeLen = 12
case AuthAlgRAKP_HMAC_SHA256:
authCodeLen = 16
default:
}
if len(msg) < 8+authCodeLen {
return ErrUnpackedDataTooShortWith(len(msg), 8+authCodeLen)
}
res.MessageTag, _, _ = unpackUint8(msg, 0)
b1, _, _ := unpackUint8(msg, 1)
res.RmcpStatusCode = RmcpStatusCode(b1)
res.MgmtConsoleSessionID, _, _ = unpackUint32L(msg, 4)
res.IntegrityCheckValue, _, _ = unpackBytes(msg, 8, authCodeLen)
return nil
}
func (*RAKPMessage4) CompletionCodes() map[uint8]string {
// no command-specific cc
return map[uint8]string{}
}
func (res *RAKPMessage4) Format() string {
return fmt.Sprintf("%v", res)
}
// authAlg is used to parse the returned RAKPMessage4 message
func (c *Client) RAKPMessage3(ctx context.Context) (response *RAKPMessage4, err error) {
// create session integrity key
sik, err := c.generate_sik()
if err != nil {
err = fmt.Errorf("generate sik failed, err: %w", err)
return
}
c.session.v20.sik = sik
k1, err := c.generate_k1()
if err != nil {
err = fmt.Errorf("generate k1 failed, err: %w", err)
return
}
c.session.v20.k1 = k1
k2, err := c.generate_k2()
if err != nil {
err = fmt.Errorf("generate k2 failed, err: %w", err)
return
}
c.session.v20.k2 = k2
authCode, err := c.generate_rakp3_authcode()
if err != nil {
return nil, fmt.Errorf("generate rakp3 auth code failed, err: %w", err)
}
request := &RAKPMessage3{
MessageTag: 0,
RmcpStatusCode: RmcpStatusCode(c.session.v20.rakp2ReturnCode),
ManagedSystemSessionID: c.session.v20.bmcSessionID,
KeyExchangeAuthenticationCode: authCode,
}
response = &RAKPMessage4{
authAlg: c.session.v20.authAlg,
}
c.session.v20.state = SessionStateRakp3Sent
err = c.Exchange(ctx, request, response)
if err != nil {
return nil, err
}
if _, err = c.ValidateRAKP4(ctx, response); err != nil {
return nil, fmt.Errorf("validate rakp4 failed, err: %w", err)
}
c.session.v20.state = SessionStateActive
return response, nil
}
func (c *Client) ValidateRAKP4(ctx context.Context, response *RAKPMessage4) (bool, error) {
if response.RmcpStatusCode != RmcpStatusCodeNoErrors {
return false, fmt.Errorf("rakp4 status code not ok, %x", response.RmcpStatusCode)
}
// verify
if c.session.v20.consoleSessionID != response.MgmtConsoleSessionID {
return false, fmt.Errorf("session not activated")
}
authCode, err := c.generate_rakp4_authcode()
if err != nil {
return false, fmt.Errorf("generate rakp4 auth code failed, err: %w", err)
}
c.DebugBytes("rakp4 console computed authcode", authCode, 16)
c.DebugBytes("rakp4 bmc returned authcode", response.IntegrityCheckValue, 16)
if !isByteSliceEqual(response.IntegrityCheckValue, authCode) {
return false, fmt.Errorf("rakp4 returned integrity check not passed, console mac %0x, bmc mac: %0x", authCode, response.IntegrityCheckValue)
}
return true, nil
}
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