SSH-Protokoll: Unterschied zwischen den Versionen

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* Daten + Padding brauchen des Rest auf
 
* Daten + Padding brauchen des Rest auf
  
−
! Field Name            !! Length (bytes) !! Description
+
:{| class="wikitable" style="text-align: center"
 +
|+SSH Header Format
 
|-
 
|-
−
| Packet Length        || 4              || Length of the packet (excluding the length of the 'Packet Length' field).
+
! style="border-bottom:none; border-right:none;"| ''Offsets''
 +
! style="border-left:none;"| Octet
 +
! colspan="8" | 0
 +
! colspan="8" | 1
 +
! colspan="8" | 2
 +
! colspan="8" | 3
 
|-
 
|-
−
| Padding Length        || 1               || Length of the random padding that is added to the packet.
+
! style="border-top: none" | Octet
 +
! Bit
 +
! style="width:2.6%;"| 0
 +
! style="width:2.6%;"| 1
 +
! style="width:2.6%;"| 2
 +
! style="width:2.6%;"| 3
 +
! style="width:2.6%;"| 4
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! style="width:2.6%;"| 5
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! style="width:2.6%;"| 6
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! style="width:2.6%;"| 7
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! style="width:2.6%;"| 8
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! style="width:2.6%;"| 9
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! style="width:2.6%;"| 10
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! style="width:2.6%;"| 11
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! style="width:2.6%;"| 12
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! style="width:2.6%;"| 13
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! style="width:2.6%;"| 14
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! style="width:2.6%;"| 15
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! style="width:2.6%;"| 16
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! style="width:2.6%;"| 17
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! style="width:2.6%;"| 18
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! style="width:2.6%;"| 19
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! style="width:2.6%;"| 20
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! style="width:2.6%;"| 21
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! style="width:2.6%;"| 22
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! style="width:2.6%;"| 23
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! style="width:2.6%;"| 24
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! style="width:2.6%;"| 25
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! style="width:2.6%;"| 26
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! style="width:2.6%;"| 27
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! style="width:2.6%;"| 28
 +
! style="width:2.6%;"| 29
 +
! style="width:2.6%;"| 30
 +
! style="width:2.6%;"| 31
 
|-
 
|-
−
| Payload              || Variable        || The actual SSH message that is being transmitted.
+
! 0
 +
! 0
 +
| colspan="32" style="background-color:#86dd74"|''Packet Length''
 
|-
 
|-
−
| Padding               || Variable       || Random data used to ensure the total packet length is a multiple of the block size (typically 8 or 16 bytes).
+
! 4
 +
! 32
 +
| colspan="8" style="background-color:#5685a4"|''Padding Length''
 +
| colspan="24" rowspan="4" style="background-color:#79dc74"|''Payload (Variable)''
 
|-
 
|-
−
| MAC (Message Authentication Code) || Variable || Message authentication code (if used) to verify the integrity of the packet.
+
! 8
 +
! 64
 
|-
 
|-
−
| Compression          || Optional       || Some SSH implementations compress the payload and/or padding for efficiency.
+
! 12
 +
! 96
 +
|-
 +
! 16
 +
! 128
 +
|-
 +
! 20
 +
! 160
 +
| colspan="32" style="background-color:#7475dc"|''Padding (Variable)''
 +
|-
 +
! 24
 +
! 192
 +
| colspan="32" style="background-color:#dc7484"|''MAC (Optional)''
 +
|}
  
 
= Konfiguration unter Linux =
 
= Konfiguration unter Linux =

Version vom 16. September 2024, 21:32 Uhr

Ablauf des Kommunikationsaufbaus

SSH Header

  • 4 Bytes werden für die Paketlänge verwendet
  • 1 Byte für die Länge des Paddings
  • Daten + Padding brauchen des Rest auf
SSH Header Format
Offsets Octet 0 1 2 3
Octet Bit 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
0 0 Packet Length
4 32 Padding Length Payload (Variable)
8 64
12 96
16 128
20 160 Padding (Variable)
24 192 MAC (Optional)

Konfiguration unter Linux

Abgerufen von „http://wiki.ixheim.de/index.php?title=SSH-Protokoll&oldid=56265“