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Re: excessive amount of output produced by `curl -v` for a TLSv1.3 connection

From: Jeroen Ooms via curl-library <curl-library_at_lists.haxx.se>
Date: Wed, 29 Mar 2023 10:57:37 +0200

On Wed, Mar 29, 2023 at 9:37 AM Kamil Dudka via curl-library
<curl-library_at_lists.haxx.se> wrote:
>
> `curl -v` started to print an excessive amount of output for a TLSv1.3
> connection. Is it really useful to get two lines of verbose output for
> each chunk of data (sometimes 1B) transferred over a TLS connection?

Depending on what you are debugging, instead of -v you can sometimes
use -D /dev/stderr in order to print only the headers, and not the
connection stuff.



>
>
> $ curl -V
> curl 7.61.1 (x86_64-redhat-linux-gnu) libcurl/7.61.1 OpenSSL/1.1.1k zlib/1.2.11 brotli/1.0.6 libidn2/2.2.0 libpsl/0.20.2 (+libidn2/2.2.0) libssh/0.9.6/openssl/zlib nghttp2/1.33.0
> Release-Date: 2018-09-05
> Protocols: dict file ftp ftps gopher http https imap imaps ldap ldaps pop3 pop3s rtsp scp sftp smb smbs smtp smtps telnet tftp
> Features: AsynchDNS IDN IPv6 Largefile GSS-API Kerberos SPNEGO NTLM NTLM_WB SSL libz brotli TLS-SRP HTTP2 UnixSockets HTTPS-proxy PSL
>
> $ curl -Lfsvo/dev/null https://static.snyk.io/cli/latest/snyk-linux
> * Trying 2a02:26f0:dc:39a::ecd...
> * TCP_NODELAY set
> * connect to 2a02:26f0:dc:39a::ecd port 443 failed: Network is unreachable
> * Trying 2a02:26f0:dc:39b::ecd...
> * TCP_NODELAY set
> * connect to 2a02:26f0:dc:39b::ecd port 443 failed: Network is unreachable
> * Trying 104.64.115.38...
> * TCP_NODELAY set
> * Connected to static.snyk.io (104.64.115.38) port 443 (#0)
> * ALPN, offering h2
> * ALPN, offering http/1.1
> * successfully set certificate verify locations:
> * CAfile: /etc/pki/tls/certs/ca-bundle.crt
> CApath: none
> } [5 bytes data]
> * TLSv1.3 (OUT), TLS handshake, Client hello (1):
> } [512 bytes data]
> * TLSv1.3 (IN), TLS handshake, Server hello (2):
> { [122 bytes data]
> * TLSv1.3 (IN), TLS handshake, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS handshake, Encrypted Extensions (8):
> { [35 bytes data]
> * TLSv1.3 (IN), TLS handshake, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS handshake, Certificate (11):
> { [3104 bytes data]
> * TLSv1.3 (IN), TLS handshake, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS handshake, CERT verify (15):
> { [264 bytes data]
> * TLSv1.3 (IN), TLS handshake, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS handshake, Finished (20):
> { [52 bytes data]
> * TLSv1.3 (OUT), TLS change cipher, Change cipher spec (1):
> } [1 bytes data]
> * TLSv1.3 (OUT), TLS handshake, [no content] (0):
> } [1 bytes data]
> * TLSv1.3 (OUT), TLS handshake, Finished (20):
> } [52 bytes data]
> * SSL connection using TLSv1.3 / TLS_AES_256_GCM_SHA384
> * ALPN, server accepted to use http/1.1
> * Server certificate:
> * subject: C=GB; L=London; O=Snyk Ltd; CN=snyk.io
> * start date: Nov 18 00:00:00 2022 GMT
> * expire date: Jul 27 23:59:59 2023 GMT
> * subjectAltName: host "static.snyk.io" matched cert's "static.snyk.io"
> * issuer: C=US; O=DigiCert Inc; OU=www.digicert.com; CN=GeoTrust RSA CA 2018
> * SSL certificate verify ok.
> } [5 bytes data]
> * TLSv1.3 (OUT), TLS app data, [no content] (0):
> } [1 bytes data]
> > GET /cli/latest/snyk-linux HTTP/1.1
> > Host: static.snyk.io
> > User-Agent: curl/7.61.1
> > Accept: */*
> >
> { [5 bytes data]
> * TLSv1.3 (IN), TLS handshake, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
> { [265 bytes data]
> * TLSv1.3 (IN), TLS handshake, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
> { [265 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> < HTTP/1.1 200 OK
> < x-amz-id-2: YvlM8X+2Tcdfmp51NLiwgfSOk7HKseAi7XbFSSyN34RlcgqH02uWnYmmnoPa6w9Wc1Xp/GdeN4Y=
> < x-amz-request-id: SRGHSEZ3EGAP94NG
> < Last-Modified: Tue, 28 Mar 2023 16:10:53 GMT
> < ETag: "33cc191c45168278f7621ae86f7555b0-9"
> < x-amz-server-side-encryption: AES256
> < Accept-Ranges: bytes
> < Content-Type: binary/octet-stream
> < Server: AmazonS3
> < Content-Length: 70874981
> < Cache-Control: max-age=296
> < Expires: Wed, 29 Mar 2023 06:59:32 GMT
> < Date: Wed, 29 Mar 2023 06:54:36 GMT
> < Connection: keep-alive
> < X-Frame-Options: SAMEORIGIN
> < X-Content-Type-Options: nosniff
> < X-Xss-Protection: 1; mode=block
> < Strict-Transport-Security: max-age=31536000; preload
> < Access-Control-Max-Age: 3000
> < Access-Control-Allow-Methods: GET
> < Access-Control-Allow-Origin: *
> <
> { [15635 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> { [1 bytes data]
> * TLSv1.3 (IN), TLS app data, [no content] (0):
> [...]
>
> We have to stop using `curl -v` in csmock plug-ins because of this:
>
> https://github.com/csutils/csmock/pull/103
>
> Same problem with the latest curl upstream git HEAD...
>
> Kamil
>
>
> --
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Received on 2023-03-29