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Set dialer local address with STEP_CLIENT_ADDR

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The environment variable STEP_CLIENT_ADDR can be used to set the local
address to use when dialing an address. This can be useful when step
is behind an CIDR-based ACL.

Fixes smallstep/cli#730
This commit is contained in:
Mariano Cano 2022-11-09 15:49:19 -08:00
parent fa8d0a68c4
commit 47bd5a80d9
No known key found for this signature in database
1 changed files with 29 additions and 1 deletions
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28
ca/tls.go
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@ -24,6 +24,10 @@ import (
// getDefaultTransport.
var mTLSDialContext func() func(ctx context.Context, network, address string) (net.Conn, error)
// localAddr is the local address to use when dialing an address. This address
// is defined by the environment variable STEP_CLIENT_ADDR.
var localAddr net.Addr
func init() {
// STEP_TLS_TUNNEL is an environment variable that can be set to do an TLS
// over (m)TLS tunnel to step-ca using identity-like credentials. The value
@ -70,6 +74,29 @@ func init() {
}
}
}
// STEP_CLIENT_ADDR is an environment variable that can be set to define the
// local address to use when dialing an address. This can be useful when
// step is run behind a CIDR-based ACL.
//
// STEP_CLIENT_ADDR can be set to an IP ("127.0.0.1", "[::1]"), a hostname
// ("localhost"), or a host:port ("[::1]:0"). If the port is set to
// something other than ":0" and the dialer is created multiple times it
// will fail with an "address already in use" error.
//
// See https://github.com/smallstep/cli/issues/730
if v := os.Getenv("STEP_CLIENT_ADDR"); v != "" {
_, _, err := net.SplitHostPort(v)
if err != nil {
// assuming that the error is a missing port, if it's not it will
// panic below.
v += ":0"
}
localAddr, err = net.ResolveTCPAddr("tcp", v)
if err != nil {
panic(err)
}
}
}
// GetClientTLSConfig returns a tls.Config for client use configured with the
@ -280,6 +307,7 @@ func getDefaultDialer() *net.Dialer {
// With the KeepAlive parameter set to 0, it will be use Golang's default.
return &net.Dialer{
Timeout: 30 * time.Second,
LocalAddr: localAddr,
}
}