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

From: Kamil Dudka via curl-library <curl-library_at_lists.haxx.se>
Date: Wed, 29 Mar 2023 09:37:20 +0200

`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?

$ 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