stunnel-users September 2021

13 participants
11 discussions

older browsers, stunnel and privoxy
by kovacs janos 04 Mar '24

04 Mar '24

sorry to bother, im trying to make older browsers be able to display TLS 1.1 and TLS 1.2 sites. i heard stunnel cant be configured to always forward to the current site address dynamically, thats why i would use privoxy. the browser is configured to send to: 127.0.0.1 443 stunnel config has this at the end: [Tunnel_in] client = yes accept = 127.0.0.1:443 connect = 127.0.0.1:8118 verifyChain = yes CAfile = ca-certs.pem checkHost = localhost 127.0.0.1:8118 is the privoxy address. this is what stunnel writes: LOG5[main]: Configuration successful LOG5[0]: Service [Tunnel_in] accepted connection from 127.0.0.1:3261 LOG5[0]: s_connect: connected 127.0.0.1:8118 LOG5[0]: Service [Tunnel_in] connected remote server from 127.0.0.1:3262 and the browser infinitely loads, and never loads anything or leaves the page. if i remove the last 3 lines, its the same just with this line added: LOG4[main]: Service [Tunnel_in] needs authentication to prevent MITM attacks but it doesnt give an error or anything. with a configuration like: [Tunnel_out] client = no accept = 127.0.0.1:443 connect = 127.0.0.1:8118 cert = stunnel.pem this is what it gives: LOG5[3]: Service [Tunnel_out] accepted connection from 127.0.0.1:3294 LOG3[3]: SSL_accept: 1407609B: error:1407609B:SSL routines:SSL23_GET_CLIENT_HELLO:https proxy request LOG5[3]: Connection reset: 0 byte(s) sent to TLS, 0 byte(s) sent to socket and browser gives a server not found error immediately. im not even sure if i should use client or server configuration in a case like this, but none of them works anyway. all i would need is for my browser to get the pages decrypted, or at least in less than TLS1.1. like how on newipnow.com i can access sites with any encryption, since they are sent to the browser without encryption. the browser just gives an "unencrypted tunnel" warning, which is how i found stunnel, and which is exactly what i need, just locally.

8 41

TPM based mutual tls authentication
by Nyiri, Gabor (Nokia - HU/Budapest) 07 Nov '23

07 Nov '23

Hi, Can you help me how to configure stunnel client to use TPM for mutual TLS authentication? I want to connect with mTLS to a remote server then make this connection available for localhost without mTLS. Thanks for your help in advance! Here is my configuration so far without TPM: debug = debug output = /tmp/stunnel.log foreground = yes [mtls_client] client = yes accept = 127.0.0.1:12019 sni = server-with-mtls.example.com checkHost = server-with-mtls.example.com connect = 1.2.3.4:443 verifyChain = yes CApath = /etc/ssl/certs/ cert = client.crt key = client.key Thanks & br, Gábor Nyíri,

2 1

Stunnel connection to Akamai Cloud Servers (Hostheaders) with SNI
by Alan C. Bonnici 06 Oct '21

06 Oct '21

Hi, I am trying to use stunnel to exchange data with a service hosted on Akamai Servers. There is a need to implement SNI. In posts dated from 2016 which I found online, Stunnel did not support Host Headers. Is there a workaround, or has Stunnel implemented this functionality? I will be testing using postman. A sample config to get me going would really be appreciated. The URL is related to plivo. It is ak-api.plivo.com. Thank you in anticipation.

3 6

Is it possible to inhibit writing the stunnel logs to the / var / log / messages file?
by simona vittori 28 Sep '21

28 Sep '21

Hello, I ask you if it's possible to inhibit writing the stunnel logs to the / var / log / messages file. How do you it? Thank you in advance Bye Simona

2 1

Need a clean way to reject a client IP
by robin.kerdiles＠emanrisk.fr 28 Sep '21

28 Sep '21

Hello everyone, I'm doing a few tests on a dockerized service for stunnel under Alpine. stunnel -version stunnel 5.60 on x86_64-alpine-linux-musl platform Compiled with OpenSSL 1.1.1k 25 Mar 2021 Running with OpenSSL 1.1.1l 24 Aug 2021 Threading:PTHREAD Sockets:POLL,IPv6 TLS:ENGINE,OCSP,PSK,SNI If I set a wrong certificate on client side, my server logs get spammed with these lines : 2021.09.28 07:43:52 LOG5[66]: Service [***] accepted connection from *** 2021.09.28 07:43:52 LOG4[66]: CERT: Pre-verification error: unable to get local issuer certificate 2021.09.28 07:43:52 LOG4[66]: Rejected by CERT at depth=2: C=***, O=***, CN=*** 2021.09.28 07:43:52 LOG3[66]: SSL_accept: ssl/statem/statem_srvr.c:3711: error:1417C086:SSL routines:tls_process_client_certificate:certificate verify failed 2021.09.28 07:43:52 LOG5[66]: Connection reset: 0 byte(s) sent to TLS, 0 byte(s) sent to socket The cpu usage goes up to 35% and it seems there is no way to set a timeout before trying to reconnect on client side (which is not the perfect fix by the way). On server side, I don't know if we are supposed to be able to do something about that (for example rate limiting the requests ?). Even the fail2ban filter doesn't seem to support this case. And anyway it seems it requires manual patching on stunnel source code for the logs. Would it be possible to put on the same line the client IP and a message about the connection which has been rejected ? fail2ban filter : https://github.com/fail2ban/fail2ban/blob/master/config/filter.d/stunnel.co… What would be appreciated -> a log line in this format : 2021.09.28 07:43:52 LOG4[66]: HOST has been rejected by CERT at depth=2: C=***, O=***, CN=*** Of course, I don't have in mind the other possible cases (missing cert, etc...). Thank you in advance, Robin KERDILES

2 1

Disguising HTTP 503 services unavailable
by Haruka Takagi 18 Sep '21

18 Sep '21

It is my understanding that; stunnel clients give up connecting servers because of HTTP 503 services unavailable, tunneling failure causes stunnel clients to notify original senders of errors, and original senders acknowledge communication failure and stop program. I would like stunnel clients to reconnecting servers in cases of 503 and not to notify original senders of failure, in order that original senders are unaware of failure and can continue program. If possible, I want to do this by writing stunnel.conf without modifying souce codes. Is this configuration possible?

4 5

protocol = proxy with redirect
by Rob Hoes 15 Sep '21

15 Sep '21

Hi, I am using client certificate verification with the redirect option, so that the connection gets transferred to a separate socket in case the certificate is not accepted (rather than dropping the connection). This works well, unless I add the option “protocol = proxy” in order to get the client’s TCP params passed on. In this case, the redirect option seems to be ignored. Are the “redirect” and “protocol = proxy” options incompatible with one another? Is there an alternative? Thanks, Rob

2 1

How to resolve DNS by stunnel?
by shiga＠smart-cast.co.jp 14 Sep '21

14 Sep '21

Hi, I'm facing DNS issues when connecting to a server using a dynamic IP address. I think stunnel refers to DNS at startup, so if the IP address changes in the middle, it will get a connection error. Can this be resolved with the "delay=on" option? I'm looking for a way to handle a dynamic IP address in stunnel. Thanks.

2 1

Session reuse problem
by Alen Loncaric 10 Sep '21

10 Sep '21

Hi guys, any reason my stunnel would not reuse sessions? 2021.09.09 13:14:00 LOG7[9]: TLS state (connect): before SSL initialization 2021.09.09 13:14:00 LOG6[8]: writesocket: Socket is closed 2021.09.09 13:14:00 LOG7[9]: Initializing application specific data for session authenticated 2021.09.09 13:14:00 LOG5[8]: Connection closed: 170 byte(s) sent to TLS, 32768 byte(s) sent to socket 2021.09.09 13:14:00 LOG7[8]: Remote descriptor (FD=10) closed 2021.09.09 13:14:00 LOG7[8]: Local descriptor (FD=3) closed 2021.09.09 13:14:00 LOG7[8]: Service [squid] finished 2021.09.09 13:14:00 LOG7[ui]: Found 1 ready file descriptor(s) 2021.09.09 13:14:00 LOG7[ui]: FD=4 events=0x1 revents=0x1 2021.09.09 13:14:00 LOG7[ui]: FD=10 events=0x1 revents=0x0 2021.09.09 13:14:00 LOG7[ui]: Dispatching a signal from the signal pipe 2021.09.09 13:14:00 LOG7[ui]: Processing SIGCHLD 2021.09.09 13:14:00 LOG7[ui]: Retrieving pid statuses with waitpid() 2021.09.09 13:14:00 LOG6[ui]: Process 1933 finished with code 0 2021.09.09 13:14:00 LOG7[9]: TLS state (connect): SSLv3/TLS write client hello 2021.09.09 13:14:00 LOG7[9]: TLS state (connect): SSLv3/TLS write client hello 2021.09.09 13:14:00 LOG7[9]: TLS state (connect): SSLv3/TLS read server hello 2021.09.09 13:14:00 LOG6[9]: Certificate verification disabled 2021.09.09 13:14:00 LOG6[9]: Certificate verification disabled 2021.09.09 13:14:00 LOG7[9]: TLS state (connect): SSLv3/TLS read server certificate 2021.09.09 13:14:00 LOG6[9]: Client certificate not requested 2021.09.09 13:14:00 LOG7[9]: TLS state (connect): SSLv3/TLS read server done 2021.09.09 13:14:00 LOG7[9]: TLS state (connect): SSLv3/TLS write client key exchange 2021.09.09 13:14:00 LOG7[9]: TLS state (connect): SSLv3/TLS write change cipher spec 2021.09.09 13:14:00 LOG7[9]: TLS state (connect): SSLv3/TLS write finished 2021.09.09 13:14:00 LOG7[9]: TLS state (connect): SSLv3/TLS write finished 2021.09.09 13:14:00 LOG7[9]: TLS state (connect): SSLv3/TLS read server session ticket 2021.09.09 13:14:00 LOG7[9]: TLS state (connect): SSLv3/TLS read change cipher spec 2021.09.09 13:14:00 LOG7[9]: TLS state (connect): SSLv3/TLS read finished 2021.09.09 13:14:00 LOG7[9]: New session callback 2021.09.09 13:14:00 LOG7[9]: Peer certificate was cached (2037 bytes) 2021.09.09 13:14:00 LOG6[9]: Session id: DC783240F69C6910A2F8B9829504840EF619E30A14FEA982C944FBFB6828555F 2021.09.09 13:14:00 LOG7[9]: 1 client connect(s) requested 2021.09.09 13:14:00 LOG7[9]: 1 client connect(s) succeeded 2021.09.09 13:14:00 LOG7[9]: 0 client renegotiation(s) requested 2021.09.09 13:14:00 LOG7[9]: 0 session reuse(s) 2021.09.09 13:14:00 LOG6[9]: TLS connected: new session negotiated 2021.09.09 13:14:00 LOG6[9]: TLSv1.2 ciphersuite: AES128-GCM-SHA256 (128-bit encryption) 2021.09.09 13:14:00 LOG3[9]: SSL_get_peer_tmp_key: Peer suddenly disconnected 2021.09.09 13:14:00 LOG7[9]: Compression: null, expansion: null 2021.09.09 13:14:01 LOG6[9]: Read socket closed (readsocket) 2021.09.09 13:14:01 LOG7[9]: Sending close_notify alert 2021.09.09 13:14:01 LOG6[9]: socket fd: Broken pipe (32) 2021.09.09 13:14:01 LOG7[9]: TLS alert (write): warning: close notify 2021.09.09 13:14:01 LOG6[9]: SSL_shutdown successfully sent close_notify alert 2021.09.09 13:14:01 LOG6[9]: writesocket: Socket is closed 2021.09.09 13:14:01 LOG5[9]: Connection closed: 170 byte(s) sent to TLS, 32768 byte(s) sent to socket 2021.09.09 13:14:01 LOG7[9]: Remote descriptor (FD=10) closed 2021.09.09 13:14:01 LOG7[9]: Local descriptor (FD=3) closed 2021.09.09 13:14:01 LOG7[9]: Service [squid] finished 2021.09.09 13:14:01 LOG7[ui]: Found 1 ready file descriptor(s) 2021.09.09 13:14:01 LOG7[ui]: FD=4 events=0x1 revents=0x1 2021.09.09 13:14:01 LOG7[ui]: FD=10 events=0x1 revents=0x0 2021.09.09 13:14:01 LOG7[ui]: Dispatching a signal from the signal pipe 2021.09.09 13:14:01 LOG7[ui]: Processing SIGCHLD 2021.09.09 13:14:01 LOG7[ui]: Retrieving pid statuses with waitpid() 2021.09.09 13:14:01 LOG6[ui]: Process 1934 finished with code 0 2021.09.09 13:14:03 LOG7[ui]: Found 1 ready file descriptor(s) 2021.09.09 13:14:03 LOG7[ui]: FD=4 events=0x1 revents=0x0 2021.09.09 13:14:03 LOG7[ui]: FD=10 events=0x1 revents=0x1 2021.09.09 13:14:03 LOG7[ui]: Service [squid] accepted (FD=3) from 127.0.0.1:49567 2021.09.09 13:14:03 LOG7[10]: Service [squid] started 2021.09.09 13:14:03 LOG7[10]: Setting local socket options (FD=3) 2021.09.09 13:14:03 LOG7[10]: Option TCP_NODELAY set on local socket 2021.09.09 13:14:03 LOG5[10]: Service [squid] accepted connection from 127.0.0.1:49567 2021.09.09 13:14:03 LOG6[10]: s_connect: connecting 44.44.44.44:522 2021.09.09 13:14:03 LOG7[10]: s_connect: s_poll_wait 44.44.44.44:522: waiting 10 seconds 2021.09.09 13:14:03 LOG7[10]: FD=6 events=0x1 revents=0x0 2021.09.09 13:14:03 LOG7[10]: FD=10 events=0x5 revents=0x0 2021.09.09 13:14:03 LOG5[10]: s_connect: connected 44.44.44.44:522 2021.09.09 13:14:03 LOG5[10]: Service [squid] connected remote server from 10.1.3.57:42843 2021.09.09 13:14:03 LOG7[10]: Setting remote socket options (FD=10) 2021.09.09 13:14:03 LOG7[10]: Option TCP_NODELAY set on remote socket 2021.09.09 13:14:03 LOG7[10]: Remote descriptor (FD=10) initialized 2021.09.09 13:14:03 LOG6[10]: SNI: sending servername: 44.44.44.44 2021.09.09 13:14:03 LOG6[10]: Peer certificate not required 2021.09.09 13:14:03 LOG7[10]: TLS state (connect): before SSL initialization 2021.09.09 13:14:03 LOG7[10]: Initializing application specific data for session authenticated 2021.09.09 13:14:03 LOG7[10]: TLS state (connect): SSLv3/TLS write client hello 2021.09.09 13:14:03 LOG7[10]: TLS state (connect): SSLv3/TLS write client hello 2021.09.09 13:14:03 LOG7[10]: TLS state (connect): SSLv3/TLS read server hello 2021.09.09 13:14:03 LOG6[10]: Certificate verification disabled 2021.09.09 13:14:03 LOG6[10]: Certificate verification disabled 2021.09.09 13:14:03 LOG7[10]: TLS state (connect): SSLv3/TLS read server certificate 2021.09.09 13:14:03 LOG6[10]: Client certificate not requested 2021.09.09 13:14:03 LOG7[10]: TLS state (connect): SSLv3/TLS read server done 2021.09.09 13:14:03 LOG7[10]: TLS state (connect): SSLv3/TLS write client key exchange 2021.09.09 13:14:03 LOG7[10]: TLS state (connect): SSLv3/TLS write change cipher spec 2021.09.09 13:14:03 LOG7[10]: TLS state (connect): SSLv3/TLS write finished 2021.09.09 13:14:03 LOG7[10]: TLS state (connect): SSLv3/TLS write finished 2021.09.09 13:14:03 LOG7[10]: TLS state (connect): SSLv3/TLS read server session ticket 2021.09.09 13:14:03 LOG7[10]: TLS state (connect): SSLv3/TLS read change cipher spec 2021.09.09 13:14:03 LOG7[10]: TLS state (connect): SSLv3/TLS read finished 2021.09.09 13:14:03 LOG7[10]: New session callback 2021.09.09 13:14:03 LOG7[10]: Peer certificate was cached (2037 bytes) 2021.09.09 13:14:03 LOG6[10]: Session id: 85FD50E2A9D57B12D315C834EBA949CF015B7776C6A18486B06CE53F4C52D689 2021.09.09 13:14:03 LOG7[10]: 1 client connect(s) requested 2021.09.09 13:14:03 LOG7[10]: 1 client connect(s) succeeded 2021.09.09 13:14:03 LOG7[10]: 0 client renegotiation(s) requested 2021.09.09 13:14:03 LOG7[10]: 0 session reuse(s) 2021.09.09 13:14:03 LOG6[10]: TLS connected: new session negotiated 2021.09.09 13:14:03 LOG6[10]: TLSv1.2 ciphersuite: AES128-GCM-SHA256 (128-bit encryption) 2021.09.09 13:14:03 LOG3[10]: SSL_get_peer_tmp_key: Peer suddenly disconnected 2021.09.09 13:14:03 LOG7[10]: Compression: null, expansion: null 2021.09.09 13:14:03 LOG7[ui]: Found 1 ready file descriptor(s) 2021.09.09 13:14:03 LOG7[ui]: FD=4 events=0x1 revents=0x0 2021.09.09 13:14:03 LOG7[ui]: FD=10 events=0x1 revents=0x1 2021.09.09 13:14:03 LOG7[ui]: Service [squid] accepted (FD=3) from 127.0.0.1:49569 2021.09.09 13:14:03 LOG7[11]: Service [squid] started 2021.09.09 13:14:03 LOG7[11]: Setting local socket options (FD=3) 2021.09.09 13:14:03 LOG7[11]: Option TCP_NODELAY set on local socket 2021.09.09 13:14:03 LOG5[11]: Service [squid] accepted connection from 127.0.0.1:49569 2021.09.09 13:14:03 LOG6[11]: s_connect: connecting 44.44.44.44:522 2021.09.09 13:14:03 LOG7[11]: s_connect: s_poll_wait 44.44.44.44:522: waiting 10 seconds 2021.09.09 13:14:03 LOG7[11]: FD=6 events=0x1 revents=0x0 2021.09.09 13:14:03 LOG7[11]: FD=10 events=0x5 revents=0x0 2021.09.09 13:14:03 LOG5[11]: s_connect: connected 44.44.44.44:522 2021.09.09 13:14:03 LOG5[11]: Service [squid] connected remote server from 10.1.3.57:42845 2021.09.09 13:14:03 LOG6[10]: Read socket closed (readsocket) 2021.09.09 13:14:03 LOG7[11]: Setting remote socket options (FD=10) 2021.09.09 13:14:03 LOG7[11]: Option TCP_NODELAY set on remote socket 2021.09.09 13:14:03 LOG7[11]: Remote descriptor (FD=10) initialized 2021.09.09 13:14:03 LOG7[10]: Sending close_notify alert 2021.09.09 13:14:03 LOG6[11]: SNI: sending servername: 44.44.44.44 2021.09.09 13:14:03 LOG6[10]: socket fd: Broken pipe (32) 2021.09.09 13:14:03 LOG6[11]: Peer certificate not required 2021.09.09 13:14:03 LOG7[10]: TLS alert (write): warning: close notify 2021.09.09 13:14:03 LOG6[10]: SSL_shutdown successfully sent close_notify alert 2021.09.09 13:14:03 LOG6[10]: writesocket: Socket is closed 2021.09.09 13:14:03 LOG7[11]: TLS state (connect): before SSL initialization2021.09.09 13:14:03 LOG5[10]: Connection closed: 170 byte(s) sent to TLS, 32768 byte(s) sent to socket 2021.09.09 13:14:03 LOG7[11]: Initializing application specific data for session authenticated 2021.09.09 13:14:03 LOG7[10]: Remote descriptor (FD=10) closed 2021.09.09 13:14:03 LOG7[10]: Local descriptor (FD=3) closed 2021.09.09 13:14:03 LOG7[10]: Service [squid] finished 2021.09.09 13:14:03 LOG7[ui]: Found 1 ready file descriptor(s) 2021.09.09 13:14:03 LOG7[ui]: FD=4 events=0x1 revents=0x1 2021.09.09 13:14:03 LOG7[ui]: FD=10 events=0x1 revents=0x0 2021.09.09 13:14:03 LOG7[ui]: Dispatching a signal from the signal pipe 2021.09.09 13:14:03 LOG7[ui]: Processing SIGCHLD 2021.09.09 13:14:03 LOG7[ui]: Retrieving pid statuses with waitpid() 2021.09.09 13:14:03 LOG6[ui]: Process 1937 finished with code 0 2021.09.09 13:14:03 LOG7[11]: TLS state (connect): SSLv3/TLS write client hello 2021.09.09 13:14:03 LOG7[11]: TLS state (connect): SSLv3/TLS write client hello 2021.09.09 13:14:03 LOG7[11]: TLS state (connect): SSLv3/TLS read server hello 2021.09.09 13:14:03 LOG6[11]: Certificate verification disabled 2021.09.09 13:14:03 LOG6[11]: Certificate verification disabled 2021.09.09 13:14:03 LOG7[11]: TLS state (connect): SSLv3/TLS read server certificate 2021.09.09 13:14:03 LOG6[11]: Client certificate not requested 2021.09.09 13:14:03 LOG7[11]: TLS state (connect): SSLv3/TLS read server done 2021.09.09 13:14:03 LOG7[11]: TLS state (connect): SSLv3/TLS write client key exchange 2021.09.09 13:14:03 LOG7[11]: TLS state (connect): SSLv3/TLS write change cipher spec 2021.09.09 13:14:03 LOG7[11]: TLS state (connect): SSLv3/TLS write finished 2021.09.09 13:14:03 LOG7[11]: TLS state (connect): SSLv3/TLS write finished 2021.09.09 13:14:03 LOG7[11]: TLS state (connect): SSLv3/TLS read server session ticket 2021.09.09 13:14:03 LOG7[11]: TLS state (connect): SSLv3/TLS read change cipher spec 2021.09.09 13:14:03 LOG7[11]: TLS state (connect): SSLv3/TLS read finished 2021.09.09 13:14:03 LOG7[11]: New session callback 2021.09.09 13:14:03 LOG7[11]: Peer certificate was cached (2037 bytes) 2021.09.09 13:14:03 LOG6[11]: Session id: B171BF0D4CDB808D50C3CE4CDAA6AE53F2396068A9BD947D8277294F91CCFBFE 2021.09.09 13:14:03 LOG7[11]: 1 client connect(s) requested 2021.09.09 13:14:03 LOG7[11]: 1 client connect(s) succeeded 2021.09.09 13:14:03 LOG7[11]: 0 client renegotiation(s) requested 2021.09.09 13:14:03 LOG7[11]: 0 session reuse(s) 2021.09.09 13:14:03 LOG6[11]: TLS connected: new session negotiated 2021.09.09 13:14:03 LOG6[11]: TLSv1.2 ciphersuite: AES128-GCM-SHA256 (128-bit encryption) 2021.09.09 13:14:03 LOG3[11]: SSL_get_peer_tmp_key: Peer suddenly disconnected 2021.09.09 13:14:03 LOG7[11]: Compression: null, expansion: null 2021.09.09 13:14:03 LOG6[11]: Read socket closed (readsocket) 2021.09.09 13:14:03 LOG7[11]: Sending close_notify alert 2021.09.09 13:14:03 LOG6[11]: socket fd: Broken pipe (32) 2021.09.09 13:14:03 LOG7[11]: TLS alert (write): warning: close notify 2021.09.09 13:14:03 LOG6[11]: SSL_shutdown successfully sent close_notify alert 2021.09.09 13:14:03 LOG6[11]: writesocket: Socket is closed 2021.09.09 13:14:03 LOG5[11]: Connection closed: 170 byte(s) sent to TLS, 32768 byte(s) sent to socket 2021.09.09 13:14:03 LOG7[11]: Remote descriptor (FD=10) closed 2021.09.09 13:14:03 LOG7[11]: Local descriptor (FD=3) closed 2021.09.09 13:14:03 LOG7[11]: Service [squid] finished 2021.09.09 13:14:03 LOG7[ui]: Found 1 ready file descriptor(s) 2021.09.09 13:14:03 LOG7[ui]: FD=4 events=0x1 revents=0x1 2021.09.09 13:14:03 LOG7[ui]: FD=10 events=0x1 revents=0x0 2021.09.09 13:14:03 LOG7[ui]: Dispatching a signal from the signal pipe 2021.09.09 13:14:03 LOG7[ui]: Processing SIGCHLD 2021.09.09 13:14:03 LOG7[ui]: Retrieving pid statuses with waitpid() 2021.09.09 13:14:03 LOG6[ui]: Process 1938 finished with code 0 If i test with s_client: openssl s_client -connect 44.44.44.44:522 -reconnect I see TLS reused every time. Thank you!

1 0

stunnel logfile and setuid/setgid
by Norbert Hanke 02 Sep '21

02 Sep '21

Hi, I'm new to this list and hope I don't raise a question that has been raised many times before. I searched the archive and couldn't find that discussed previously... I want to configure stunnel using setuid = nobody setgid = nobody while having it write its output to its own logfile, not using syslog, with output = /var/log/stunnel.log log = append syslog = no This works when user nobody has write-access to an existing logfile, or user nobody is allowed to create the file in the directory. Both is not a good idea: user nobody should not have write access there. I could limit potential damage by having a separate directory with such access to nobody, but that is still kind of wrong. Or I could create a separate user only for stunnel and give that user full access to a separate directory: that would be more secure, only a hijacked (hopefully not) stunnel could tamper with its own logfiles. Shouldn't stunnel create and/or open the logfile while it is still running as root, and only then switch to user nobody? Or is there an option that I did not see so far allowing for what I'm trying? Thanks for any help. Regards, Norbert

1 0

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stunnel-users September 2021