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allow restriction of destination ip address #53

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2 changes: 1 addition & 1 deletion README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -24,7 +24,7 @@ Simple socks5 server using go-socks5 with authentication, allowed ips list and d
|PROXY_USER|String|EMPTY|Set proxy user (also required existed PROXY_PASS)|
|PROXY_PASSWORD|String|EMPTY|Set proxy password for auth, used with PROXY_USER|
|PROXY_PORT|String|1080|Set listen port for application inside docker container|
|ALLOWED_DEST_FQDN|String|EMPTY|Allowed destination address regular expression pattern. Default allows all.|
|ALLOWED_DEST_FQDN|String|EMPTY|Allowed destination address regular expression pattern. Default allows all. Examples "(192.168.0.1|go.dev)"|
|ALLOWED_IPS|String|Empty|Set allowed IP's that can connect to proxy, separator `,`|


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11 changes: 9 additions & 2 deletions ruleset.go
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Expand Up @@ -19,6 +19,13 @@ type PermitDestAddrPatternRuleSet struct {
}

func (p *PermitDestAddrPatternRuleSet) Allow(ctx context.Context, req *socks5.Request) (context.Context, bool) {
match, _ := regexp.MatchString(p.AllowedFqdnPattern, req.DestAddr.FQDN)
return ctx, match
var match bool
if req.DestAddr.FQDN != "" {
match, _ = regexp.MatchString(p.AllowedFqdnPattern, req.DestAddr.FQDN)
} else if req.DestAddr.IP != nil {
match, _ = regexp.MatchString(p.AllowedFqdnPattern, req.DestAddr.IP.String())
} else {
match = true
}
return ctx, match
}