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382 lines
8.4 KiB
382 lines
8.4 KiB
package sgfw
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import (
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"fmt"
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"net"
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"os"
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"bufio"
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"strings"
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"strconv"
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"errors"
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"github.com/subgraph/oz/ipc"
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)
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const ReceiverSocketPath = "/tmp/fwoz.sock"
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type OzInitProc struct {
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Name string
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Pid int
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SandboxID int
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}
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var OzInitPids []OzInitProc = []OzInitProc{}
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func addInitPid(pid int, name string, sboxid int) {
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fmt.Println("::::::::::: init pid added: ", pid, " -> ", name)
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for i := 0; i < len(OzInitPids); i++ {
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if OzInitPids[i].Pid == pid {
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return
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}
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}
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ozi := OzInitProc{Name: name, Pid: pid, SandboxID: sboxid}
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OzInitPids = append(OzInitPids, ozi)
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}
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func removeInitPid(pid int) {
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fmt.Println("::::::::::: removing PID: ", pid)
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for i := 0; i < len(OzInitPids); i++ {
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if OzInitPids[i].Pid == pid {
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OzInitPids = append(OzInitPids[:i], OzInitPids[i+1:]...)
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return
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}
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}
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}
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func addFWRule(fw *Firewall, whitelist bool, srchost, dsthost, dstport string) error {
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policy := fw.PolicyForPath("*")
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rulestr := ""
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if whitelist {
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rulestr += "ALLOW"
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} else {
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rulestr += "DENY"
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}
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rulestr += "|" + dsthost + ":" + dstport + "|SESSION|" + srchost
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_, err := policy.parseRule(rulestr, true)
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return err
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}
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func removeAllByIP(fw *Firewall, srcip string) bool {
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log.Notice("XXX: Attempting to remove all rules associated with Oz interface: ", srcip)
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saddr := net.ParseIP(srcip)
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if saddr == nil {
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return false
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}
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policy := fw.PolicyForPath("*")
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nrm := 0
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for _, rr := range policy.rules {
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if rr.saddr != nil && rr.saddr.Equal(saddr) {
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log.Notice("XXX: removing ephemeral rules by Oz interface ", srcip, ": ", rr)
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policy.removeRule(rr)
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nrm++
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}
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}
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if nrm == 0 {
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log.Notice("XXX: did not remove any rules for interface")
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}
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return true
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}
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func ReceiverLoop(fw *Firewall, c net.Conn) {
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defer c.Close()
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bio := bufio.NewReader(c)
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for {
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buf, err := bio.ReadBytes('\n')
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if err != nil {
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log.Notice("Error reading data from IPC client: ", err)
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return
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}
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data := string(buf)
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log.Notice("Received incoming IPC:",data)
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if data[len(data)-1] == '\n' {
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data = data[0:len(data)-1]
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}
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if data == "dump" {
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log.Notice("Dumping oz-firewall rule set to client...")
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rl := fw.PolicyForPath("*").rules
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totalIRules := 0
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for r := 0; r < len(rl); r++ {
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if rl[r].saddr != nil {
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totalIRules++
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}
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}
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banner := fmt.Sprintf("There are a total of %d rule(s).\n", totalIRules)
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c.Write([]byte(banner))
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for r := 0; r < len(rl); r++ {
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hostname := ""
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if rl[r].hostname != "" {
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hostname = " (" + rl[r].hostname + ") "
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}
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portstr := strconv.Itoa(int(rl[r].port))
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if rl[r].port == 0 {
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portstr = "*"
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}
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ruledesc := fmt.Sprintf("id %v, %v | %v, src:%v -> %v%v: %v\n", rl[r].id, RuleModeString[rl[r].mode], RuleActionString[rl[r].rtype], rl[r].saddr, rl[r].addr, hostname, portstr)
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c.Write([]byte(ruledesc))
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}
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/* for i := 0; i < len(sandboxRules); i++ {
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rulestr := ""
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if sandboxRules[i].Whitelist {
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rulestr += "whitelist"
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} else {
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rulestr += "blacklist"
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}
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rulestr += " " + sandboxRules[i].SrcIf.String() + " -> " + sandboxRules[i].DstIP.String() + " : " + strconv.Itoa(int(sandboxRules[i].DstPort)) + "\n"
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c.Write([]byte(rulestr))
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} */
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return
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} else {
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tokens := strings.Split(data, " ")
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if len(tokens) == 2 && tokens[0] == "removeall" {
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log.Notice("Attempting to remove all: ", tokens[1])
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removeAllByIP(fw, tokens[1])
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return
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}
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if tokens[0] == "register-init" && len(tokens) >= 3 {
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initp := tokens[1]
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initpid, err := strconv.Atoi(initp)
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if err != nil {
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log.Notice("IPC received invalid oz-init pid: ", initp)
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c.Write([]byte("Bad command: init pid was invalid"))
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return
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}
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sboxid, err := strconv.Atoi(tokens[3])
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if err != nil {
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log.Notice("IPC received invalid oz sbox number: ",tokens[3])
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log.Notice("Data: %v", data)
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c.Write([]byte("Bad command: sandbox id was invalid"))
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return
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}
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// ozname := strings.Join(tokens[2:], " ")
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log.Notice("IPC message for register-init OK.")
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addInitPid(initpid, tokens[2], sboxid)
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c.Write([]byte("OK"))
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return
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} else if tokens[0] == "unregister-init" && len(tokens) == 2 {
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initp := tokens[1]
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initpid, err := strconv.Atoi(initp)
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if err != nil {
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log.Notice("IPC received invalid oz-init pid: ", initp)
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c.Write([]byte("Bad command: init pid was invalid"))
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return
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}
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removeInitPid(initpid)
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c.Write([]byte("OK.\n"))
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}
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if len(tokens) != 6 {
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log.Notice("IPC received invalid command: " + data)
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c.Write([]byte("Received bad number of parameters.\n"))
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return
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} else if tokens[0] != "add" && tokens[0] != "remove" {
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log.Notice("IPC received invalid command: " + data)
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c.Write([]byte("Unrecognized command.\n"))
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return
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} else if tokens[1] != "whitelist" && tokens[1] != "blacklist" {
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log.Notice("IPC received invalid command: " + data)
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c.Write([]byte("Bad command: must specify either whitelist or blacklist.\n"))
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return
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}
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add := true
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if tokens[0] == "remove" {
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add = false
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}
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w := true
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if tokens[1] == "blacklist" {
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w = false
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}
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srchost := tokens[2]
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dsthost := tokens[3]
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srcip := net.ParseIP(srchost)
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if srcip == nil {
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log.Notice("IP conversion failed: ", srchost)
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srcip = net.IP{0,0,0,0}
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}
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dstport := tokens[4]
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dstp, err := strconv.Atoi(dstport)
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if dstport != "*" && (err != nil || dstp < 0 || dstp > 65535) {
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log.Notice("IPC received invalid destination port: ", tokens[4])
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c.Write([]byte("Bad command: dst port was invalid"))
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return
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}
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/* initp := tokens[5]
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initpid, err := strconv.Atoi(initp)
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if err != nil {
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log.Notice("IPC received invalid oz-init pid: ", initp)
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c.Write([]byte("Bad command: init pid was invalid"))
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return
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} */
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if add {
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log.Noticef("Adding new rule to oz sandbox/fw: %v / %v -> %v : %v", w, srchost, dsthost, dstport)
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// addInitPid(initpid)
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err := addFWRule(fw, w, srchost, dsthost, dstport)
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if err != nil {
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log.Error("Error adding dynamic OZ firewall rule to fw-daemon: ", err)
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} else {
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log.Notice("XXX: rule also successfully added to fw-daemon")
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}
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} else {
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log.Notice("Removing new rule from oz sandbox/fw... ")
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}
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log.Notice("IPC received command: " + data)
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c.Write([]byte("OK.\n"))
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return
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}
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}
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}
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func OzReceiver(fw *Firewall) {
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log.Notice("XXX: dispatching oz receiver...")
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sboxes, err := getSandboxes()
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if err != nil {
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log.Warning("Error retrieving list of running Oz sandbox init processes: ", err)
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} else {
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if len(sboxes) > 0 {
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log.Warning("Adding existing Oz sandbox init pids...")
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for s := 0; s < len(sboxes); s++ {
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//profname := fmt.Sprintf("%s (%d)", sboxes[s].Profile, sboxes[s].Id)
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addInitPid(sboxes[s].InitPid, sboxes[s].Profile, sboxes[s].Id)
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}
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} else {
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log.Warning("It does not appear there were any Oz sandboxed processes already launched.")
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}
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}
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os.Remove(ReceiverSocketPath)
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lfd, err := net.Listen("unix", ReceiverSocketPath)
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if err != nil {
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log.Fatal("Could not open oz receiver socket:", err)
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}
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for {
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fd, err := lfd.Accept()
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if err != nil {
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log.Fatal("Could not accept receiver client:", err)
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}
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go ReceiverLoop(fw, fd)
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}
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}
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type ListProxiesMsg struct {
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_ string "ListProxies"
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}
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type ListProxiesResp struct {
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Proxies []string "ListProxiesResp"
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}
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func ListProxies() ([]string, error) {
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resp, err := clientSend(&ListProxiesMsg{})
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if err != nil {
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return nil, err
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}
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body, ok := resp.Body.(*ListProxiesResp)
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if !ok {
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return nil, errors.New("ListProxies response was not expected type")
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}
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return body.Proxies, nil
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}
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const OzSocketName = "@oz-control"
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var bSockName = OzSocketName
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var messageFactory = ipc.NewMsgFactory(
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new(ListProxiesMsg),
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new(ListProxiesResp),
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)
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func clientConnect() (*ipc.MsgConn, error) {
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bSockName = os.Getenv("SOCKET_NAME")
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if bSockName != "" {
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fmt.Println("Attempting to connect on custom socket provided through environment: ", bSockName)
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if bSockName[0:1] != "@" {
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fmt.Println("Environment variable specified invalid socket name... prepending @")
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bSockName = "@" + bSockName
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}
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} else {
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bSockName = OzSocketName
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}
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return ipc.Connect(bSockName, messageFactory, nil)
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}
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func clientSend(msg interface{}) (*ipc.Message, error) {
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c, err := clientConnect()
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if err != nil {
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return nil, err
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}
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defer c.Close()
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rr, err := c.ExchangeMsg(msg)
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if err != nil {
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return nil, err
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}
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resp := <-rr.Chan()
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rr.Done()
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return resp, nil
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}
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