111 lines
2.8 KiB
Go
111 lines
2.8 KiB
Go
package client
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import (
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sha "crypto/sha256"
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fmt "fmt"
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ioutil "io/ioutil"
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log "log"
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os "os"
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regexp "regexp"
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strings "strings"
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sync "sync"
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time "time"
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gstructs "git.dragonheim.net/dragonheim/gagent/internal/gstructs"
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zmq "github.com/pebbe/zmq4"
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)
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/*
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Client mode will send an agent file to a router for processing
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Clients do not process the agent files, only send them as
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requests to a router. If started without arguments, the client
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will contact the router and attempt to retrieve the results
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of it's most recent request.
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Main is the entrypoint for the client process
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*/
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func Main(wg *sync.WaitGroup, config gstructs.GagentConfig) {
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log.Printf("[INFO] Starting client\n")
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defer wg.Done()
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var agent gstructs.AgentDetails
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var err error
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if config.CMode {
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agent.ScriptCode, err = ioutil.ReadFile(config.File)
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if err != nil {
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log.Printf("[ERROR] No such file or directory: %s", config.File)
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os.Exit(4)
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}
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log.Printf("[DEBUG] Agent file contents: \n----- -----\n%s\n----- -----\n", agent.ScriptCode)
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}
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agent.Client = config.UUID
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agent.Shasum = fmt.Sprintf("%s", sha.Sum256(agent.ScriptCode))
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log.Printf("[INFO] SHA256 of Agent file: %s", agent.Shasum)
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agent.Status = "loaded"
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agent.Hints = getTagsFromHints(agent)
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agent.Answer = nil
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for key := range config.Routers {
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/*
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* Generate connect string for this router.
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*/
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rport := config.ClientPort
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if config.Routers[key].ClientPort != 0 {
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rport = config.Routers[key].ClientPort
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}
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connectString := fmt.Sprintf("tcp://%s:%d", config.Routers[key].RouterAddr, rport)
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wg.Add(1)
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go sendAgent(wg, config.UUID, connectString, agent)
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}
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}
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/*
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* Parse Agent file for GHINT data to populate the G'Agent hints
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*/
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func getTagsFromHints(agent gstructs.AgentDetails) []string {
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var tags []string
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re := regexp.MustCompile(`\s*set\s+GHINT\s*\[\s*split\s*"(?P<Hints>.+)"\s*\,\s*\]`)
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res := re.FindStringSubmatch(string(agent.ScriptCode))
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if len(res) < 1 {
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log.Printf("[ERROR] Agent is missing GHINT tags")
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os.Exit(4)
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}
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tags = strings.Split(res[1], ",")
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log.Printf("[DEBUG] G'Agent hints: %v\n", tags)
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return tags
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}
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func sendAgent(wg *sync.WaitGroup, uuid string, connectString string, agent gstructs.AgentDetails) {
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defer wg.Done()
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var mu sync.Mutex
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mu.Lock()
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sock, _ := zmq.NewSocket(zmq.REQ)
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defer sock.Close()
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_ = sock.SetIdentity(uuid)
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log.Printf("[DEBUG] Attempting to connect to %s\n", connectString)
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err := sock.Connect(connectString)
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if err != nil {
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log.Printf("[ERROR] Failed to connect to %s\n", connectString)
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os.Exit(10)
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}
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log.Printf("[DEBUG] Start sending agent...\n")
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status, err := sock.SendMessage(agent)
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if err != nil {
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log.Printf("[ERROR] Failed to send agent to router\n")
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// os.Exit(11)
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return
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}
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log.Printf("[DEBUG] Agent send status: %d\n", status)
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mu.Unlock()
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time.Sleep(10 * time.Second)
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}
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