CMD AUTH LOGON CHALLENGE Server: Difference between revisions

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[[CMD_AUTH_LOGON_CHALLENGE_Server]] is a [[Login Packet]] sent by the server after receiving [[CMD_AUTH_LOGON_CHALLENGE_Client]].
[[CMD_AUTH_LOGON_CHALLENGE_Server]] is a [[Login Packet]] sent by the server after receiving [[CMD_AUTH_LOGON_CHALLENGE_Client]]. The client reply is the [[CMD_AUTH_LOGON_PROOF_Client]] packet.
 
 


= Packet Layout =
= Packet Layout =
Line 144: Line 142:
|}
|}


= Size =
For all versions, if the result is not [[Login_Packet_Results|SUCCESS]] (0x00) the packet is 3 bytes.
If the result is [[Login_Packet_Results|SUCCESS]] (0x00):
{| class="wikitable"
|+ security_flags.Authenticator Fields
! Version
! security_flags field
! Size
|-
| {{Template:Sandbox/VersionRange|min_expansionlevel=1|min_build=1.1}} || - || 118
|-
| {{Template:Sandbox/VersionRange|min_expansionlevel=1|min_build=1.12}} || 0x0 || 119
|-
| {{Template:Sandbox/VersionRange|min_expansionlevel=1|min_build=1.12}} || 0x1 || 119 + 20 = 139
|-
| {{Template:Sandbox/VersionRange|min_expansionlevel=2|min_build=2.4.3.8606}} || 0x1 / 0b001 || 119 + 20 = 139
|-
| {{Template:Sandbox/VersionRange|min_expansionlevel=2|min_build=2.4.3.8606}} || 0x2 / 0b010 || 119 + 12 = 131
|-
| {{Template:Sandbox/VersionRange|min_expansionlevel=2|min_build=2.4.3.8606}} || 0x4 / 0b100 || 119 + 1 = 120
|-
| {{Template:Sandbox/VersionRange|min_expansionlevel=2|min_build=2.4.3.8606}} || 0x3 / 0b011 || 119 + 12 + 20 = 151
|-
| {{Template:Sandbox/VersionRange|min_expansionlevel=2|min_build=2.4.3.8606}} || 0x5 / 0b101 || 119 + 1 + 20 = 140
|-
| {{Template:Sandbox/VersionRange|min_expansionlevel=2|min_build=2.4.3.8606}} || 0x7 / 0b111 || 119 + 1 + 12 + 20 = 152
|}


[[Category:Packet]]
[[Category:Packet]]
[[Category:Packet/Login]]
[[Category:Packet/Login]]
[[Category:Login]]
[[Category:Login]]

Revision as of 19:03, 30 May 2021

CMD_AUTH_LOGON_CHALLENGE_Server is a Login Packet sent by the server after receiving CMD_AUTH_LOGON_CHALLENGE_Client. The client reply is the CMD_AUTH_LOGON_PROOF_Client packet.

Packet Layout

AuthLogonChallenge_Server
Offset Size / Endianness Type Name Description
Header
0x1 1 / - uint8 opcode 0x00 for CMD_AUTH_LOGON_CHALLENGE
0x2 1 / - uint8 protocol_version Exact purpose unknown. Must be 0 for all versions.
0x3 1 / - uint8 result The fields below are only included if this is SUCCESS (0x00).
Body
0x4 32 / Little uint8[32] server_public_key SRP public server ephemeral.
All SRP operations are performed with little endian values.
0x24 1 / - uint8 generator_len SRP generator length.
Should always be 1 since the generator is never greater than 255.
0x25 generator_len / - uint8 generator SRP generator. All SRP operations are performed with little endian values.
(0x26) 1 / - uint8 large_safe_prime_len SRP large safe prime length.
All SRP operations are performed with little endian values.
Client will not read more than 32 bytes.
(0x27) large_safe_prime_len / Little uint8[large_safe_prime_len] large_safe_prime SRP large safe prime. All SRP operations are performed with little endian values.
(0x47) 32 / Little uint8[32] salt SRP user's salt. All SRP operations are performed with little endian values.
(0x47) 16 / Little uint8[16] crc_salt A salt to be used in CMD_AUTH_LOGON_PROOF_Client.crc_hash.
Can be all zeros.

Vanilla (1.12) Additions

Vanilla (1.12) added two factor authentication PIN fields which are appended to the packet.

Vanilla (1.12) Additions
Offset Size / Endianness Type Name Description
0x00 1 / - bool (size 1 byte) two_factor_authentication 0 for disabled. The fields below are not included if this is 0.
0x00 4 / Little uint32 pin_grid_seed Seed value for the PIN grid on the client.
Only here if the two_factor_authentication field is true.
0x00 16 / Little uint8[16] pin_salt Salt value for the client.
Only here if the two_factor_authentication field is true.

BC (2.4.3.8606) Changes

Sometime around BC (2) the two factor fields were repurposed to the below. They are present on BC (2.4.3.8606) and possibly also as early as BC (2.0.0). These replace the Vanilla (1.12) fields from above.

Security Flags
Name Value Description
NONE 0x00 No additional checks verification.
PIN 0x01 TOTP verification entered as a PIN.
UNKNOWN0 0x02 Unknown. Referred to as "Matrix input" in Mangos source.
AUTHENTICATOR 0x04 Authenticator.

The fields added depend on which bits are set in the security_flags field.

BC (2) Changes
Offset Size / Endianness Type Name Description
Header
(0x57) 1 / - uint8 security_flags Bit pattern for optional authentication features.
More than one feature can be used,
and the fields are just appended in the bit pattern order from lowest first. See security_flag.
tables below for specifics. If 0 the packet ends here.
security_flags.PIN fields, if applicable.
security_flags.unknown fields, if applicable.
security_flags.Authenticator field, if applicable.

The following fields are only present if the appropriate bit is set.

security_flags.PIN Fields
Offset Size / Endianness Type Name Description
0x00 4 / Little uint32 pin_grid_seed Seed value for the PIN grid on the client.
Only here if the two_factor_authentication field is true.
0x04 16 / Little uint8[16] pin_salt Salt value for the client.
Only here if the two_factor_authentication field is true.
security_flags.Unknown0 Fields
Offset Size / Endianness Type Name Description
0x00 1 / - uint8 unknown0 Unknown. Statically set to 0 in Mangos.
0x01 1 / - uint8 unknown1 Unknown. Statically set to 0 in Mangos.
0x02 1 / - uint8 unknown2 Unknown. Statically set to 0 in Mangos.
0x03 1 / - uint8 unknown3 Unknown. Statically set to 0 in Mangos.
0x04 8 / - uint64 unknown4 Unknown. Statically set to 0 in Mangos.
security_flags.Authenticator Fields
Offset Size / Endianness Type Name Description
0x00 1 / - uint8 unknown0 Statically set to 1 in Mangos.

Size

For all versions, if the result is not SUCCESS (0x00) the packet is 3 bytes.

If the result is SUCCESS (0x00):

security_flags.Authenticator Fields
Version security_flags field Size
≥ Vanilla (1.1) - 118
≥ Vanilla (1.12) 0x0 119
≥ Vanilla (1.12) 0x1 119 + 20 = 139
≥ BC (2.4.3.8606) 0x1 / 0b001 119 + 20 = 139
≥ BC (2.4.3.8606) 0x2 / 0b010 119 + 12 = 131
≥ BC (2.4.3.8606) 0x4 / 0b100 119 + 1 = 120
≥ BC (2.4.3.8606) 0x3 / 0b011 119 + 12 + 20 = 151
≥ BC (2.4.3.8606) 0x5 / 0b101 119 + 1 + 20 = 140
≥ BC (2.4.3.8606) 0x7 / 0b111 119 + 1 + 12 + 20 = 152
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