-
Notifications
You must be signed in to change notification settings - Fork 101
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Add starttls for smtp, imap and ftp (#36)
- Loading branch information
1 parent
1c8bd16
commit 89eff28
Showing
9 changed files
with
499 additions
and
28 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,29 +1,166 @@ | ||
| package prober | ||
|
|
||
| import ( | ||
| "bufio" | ||
| "crypto/tls" | ||
| "fmt" | ||
| "net" | ||
| "regexp" | ||
| "time" | ||
|
|
||
| "github.com/ribbybibby/ssl_exporter/config" | ||
|
|
||
| pconfig "github.com/prometheus/common/config" | ||
| "github.com/prometheus/common/log" | ||
| ) | ||
|
|
||
| // ProbeTCP performs a tcp probe | ||
| func ProbeTCP(target string, module config.Module, timeout time.Duration) (*tls.ConnectionState, error) { | ||
| tlsConfig, err := pconfig.NewTLSConfig(&module.TLSConfig) | ||
| dialer := &net.Dialer{Timeout: timeout} | ||
|
|
||
| conn, err := dialer.Dial("tcp", target) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| defer conn.Close() | ||
|
|
||
| if err := conn.SetDeadline(time.Now().Add(timeout)); err != nil { | ||
| return nil, fmt.Errorf("Error setting deadline") | ||
| } | ||
|
|
||
| if module.TCP.StartTLS != "" { | ||
| err = startTLS(conn, module.TCP.StartTLS) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| } | ||
|
|
||
| conn, err := tls.DialWithDialer(&net.Dialer{Timeout: timeout}, "tcp", target, tlsConfig) | ||
| tlsConfig, err := pconfig.NewTLSConfig(&module.TLSConfig) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| defer conn.Close() | ||
|
|
||
| state := conn.ConnectionState() | ||
| if tlsConfig.ServerName == "" { | ||
| targetAddress, _, err := net.SplitHostPort(target) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| tlsConfig.ServerName = targetAddress | ||
| } | ||
|
|
||
| tlsConn := tls.Client(conn, tlsConfig) | ||
| defer tlsConn.Close() | ||
|
|
||
| if err := tlsConn.Handshake(); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| state := tlsConn.ConnectionState() | ||
|
|
||
| return &state, nil | ||
| } | ||
|
|
||
| type queryResponse struct { | ||
| expect string | ||
| send string | ||
| } | ||
|
|
||
| var ( | ||
| // These are the protocols for which I had servers readily available to test | ||
| // against. There are plenty of other protocols that should be added here in | ||
| // the future. | ||
| // | ||
| // See openssl s_client for more examples: | ||
| // https://github.com/openssl/openssl/blob/openssl-3.0.0-alpha3/apps/s_client.c#L2229-L2728 | ||
| startTLSqueryResponses = map[string][]queryResponse{ | ||
| "smtp": []queryResponse{ | ||
| queryResponse{ | ||
| expect: "^220", | ||
| }, | ||
| queryResponse{ | ||
| send: "EHLO prober", | ||
| }, | ||
| queryResponse{ | ||
| expect: "^250-STARTTLS", | ||
| }, | ||
| queryResponse{ | ||
| send: "STARTTLS", | ||
| }, | ||
| queryResponse{ | ||
| expect: "^220", | ||
| }, | ||
| }, | ||
| "ftp": []queryResponse{ | ||
| queryResponse{ | ||
| expect: "^220", | ||
| }, | ||
| queryResponse{ | ||
| send: "AUTH TLS", | ||
| }, | ||
| queryResponse{ | ||
| expect: "^234", | ||
| }, | ||
| }, | ||
| "imap": []queryResponse{ | ||
| queryResponse{ | ||
| expect: "OK", | ||
| }, | ||
| queryResponse{ | ||
| send: ". CAPABILITY", | ||
| }, | ||
| queryResponse{ | ||
| expect: "STARTTLS", | ||
| }, | ||
| queryResponse{ | ||
| expect: "OK", | ||
| }, | ||
| queryResponse{ | ||
| send: ". STARTTLS", | ||
| }, | ||
| queryResponse{ | ||
| expect: "OK", | ||
| }, | ||
| }, | ||
| } | ||
| ) | ||
|
|
||
| // startTLS will send the STARTTLS command for the given protocol | ||
| func startTLS(conn net.Conn, proto string) error { | ||
| var err error | ||
|
|
||
| qr, ok := startTLSqueryResponses[proto] | ||
| if !ok { | ||
| return fmt.Errorf("STARTTLS is not supported for %s", proto) | ||
| } | ||
|
|
||
| scanner := bufio.NewScanner(conn) | ||
| for _, qr := range qr { | ||
| if qr.expect != "" { | ||
| var match bool | ||
| for scanner.Scan() { | ||
| log.Debugf("read line: %s", scanner.Text()) | ||
| match, err = regexp.Match(qr.expect, scanner.Bytes()) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| if match { | ||
| log.Debugf("regex: %s matched: %s", qr.expect, scanner.Text()) | ||
| break | ||
| } | ||
| } | ||
| if scanner.Err() != nil { | ||
| return scanner.Err() | ||
| } | ||
| if !match { | ||
| return fmt.Errorf("regex: %s didn't match: %s", qr.expect, scanner.Text()) | ||
| } | ||
| } | ||
| if qr.send != "" { | ||
| log.Debugf("sending line: %s", qr.send) | ||
| if _, err := fmt.Fprintf(conn, "%s\r\n", qr.send); err != nil { | ||
| return err | ||
| } | ||
| } | ||
| } | ||
| return nil | ||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Oops, something went wrong.