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A command line tool and library for transferring data with URL syntax, supporting DICT, FILE, FTP, FTPS, GOPHER, GOPHERS, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS, MQTT, POP3, POP3S, RTMP, RTMPS, RTSP, SCP, SFTP, SMB, SMBS, SMTP, SMTPS, TELNET, TFTP, WS and WSS. libcurl offers a myriad of powerful features
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Rod Widdowson df1ff17f88 schannel: allow partial chains for manual peer verification 
- Align --cacert behaviour with OpenSSL and LibreSSL.

This changes the default behavior of Schannel manual certificate
verification, which is used when the user provides their own CA
certificates for verification, to accept partial chains. In other words,
the user may provide an intermediate certificate without having to
provide the root CA.

Win8/Server2012 widened the PKIX chain traversal API to allow
certificate traversal to terminate at an intermediate.

This behaviour (terminate at the fist matching intermediate) is the
default for LibreSSL and OpenSSL (with OpenSSL allowing control via
CURLSSLOPT_NO_PARTIALCHAIN).

This change uses the new API if it is available, and also allows the
behaviour to revert legacy if CURLSSLOPT_NO_PARTIALCHAIN is present.

Closes https://github.com/curl/curl/pull/17418
2025-06-14 18:55:08 -04:00
.circleci CI: fix zizmor 1.9.0 warnings, shellcheck verify CI shell code, fix fallouts 2025-06-06 21:30:43 +02:00
.github tests: always make bundles, adapt build and tests 2025-06-14 21:08:23 +02:00
CMake TLS: remove support for Secure Transport and BearSSL 2025-06-11 07:54:19 +02:00
docs schannel: allow partial chains for manual peer verification 2025-06-14 18:55:08 -04:00
include RELEASE-NOTES: synced 2025-06-11 09:25:01 +02:00
lib schannel: allow partial chains for manual peer verification 2025-06-14 18:55:08 -04:00
LICENSES copyright: update all copyright lines and remove year ranges 2023-01-03 09:19:21 +01:00
m4 TLS: remove support for Secure Transport and BearSSL 2025-06-11 07:54:19 +02:00
packages spelling: call it null-terminate consistently 2025-05-30 17:29:45 +02:00
plan9 copyright: update all copyright lines and remove year ranges 2023-01-03 09:19:21 +01:00
projects windows: reduce/stop loading DLLs at runtime 2025-06-11 05:39:09 +02:00
scripts tests: always make bundles, adapt build and tests 2025-06-14 21:08:23 +02:00
src tests: always make bundles, adapt build and tests 2025-06-14 21:08:23 +02:00
tests tests: always make bundles, adapt build and tests 2025-06-14 21:08:23 +02:00
winbuild windows: reduce/stop loading DLLs at runtime 2025-06-11 05:39:09 +02:00
.dir-locals.el copyright: update all copyright lines and remove year ranges 2023-01-03 09:19:21 +01:00
.git-blame-ignore-revs copyright: update all copyright lines and remove year ranges 2023-01-03 09:19:21 +01:00
.gitattributes winbuild: MS-DOS batch tidy-ups 2024-07-02 19:26:15 +02:00
.gitignore tidy-up: .gitignore lines mostly 2025-01-27 20:59:46 +01:00
.mailmap ws: tests and fixes 2025-06-02 11:15:38 +02:00
acinclude.m4 configure: fix --disable-rt 2025-04-03 11:10:47 +02:00
appveyor.sh tests: always make bundles, adapt build and tests 2025-06-14 21:08:23 +02:00
appveyor.yml windows: fix builds targeting WinXP, test it in CI 2025-05-22 13:04:28 +02:00
buildconf copyright: update all copyright lines and remove year ranges 2023-01-03 09:19:21 +01:00
CHANGES.md CHANGES: rename to CHANGES.md, no longer generated 2024-08-01 13:37:12 +02:00
CMakeLists.txt tests: always make bundles, adapt build and tests 2025-06-14 21:08:23 +02:00
configure.ac tests: always make bundles, adapt build and tests 2025-06-14 21:08:23 +02:00
COPYING COPYING: bump copyright year range to 1996 - 2025 2025-01-01 21:12:12 +01:00
curl-config.in curl-config: tidy up, optimize 2024-12-24 01:21:38 +01:00
Dockerfile Dockerfile: update debian:bookworm-slim Docker digest to e5865e6 2025-06-11 06:00:17 +02:00
GIT-INFO.md build: drop tool_hugehelp.c.cvs, tidy up macros, drop buildconf.bat 2025-01-26 14:22:49 +01:00
libcurl.pc.in configure: do not echo most inherited LDFLAGS to config files 2024-11-14 09:55:45 +01:00
Makefile.am TLS: remove support for Secure Transport and BearSSL 2025-06-11 07:54:19 +02:00
README docs: minor grammar fixes 2022-09-29 10:44:12 +02:00
README.md spacecheck.pl: drop more exceptions 2025-05-13 16:01:07 +02:00
RELEASE-NOTES RELEASE-NOTES: synced 2025-06-11 09:25:01 +02:00
renovate.json GHA: drop "3" from openssl names and keys 2024-10-23 19:36:03 +02:00
REUSE.toml projects/Windows: remove wolfSSL from legacy projects 2024-12-22 03:10:35 -05:00
SECURITY.md docs: Clarify OpenSSF Best Practices vs Scorecard 2024-08-22 11:50:20 +02:00

README.md

curl logo

curl is a command-line tool for transferring data specified with URL syntax. Learn how to use curl by reading the manpage or everything curl.

Find out how to install curl by reading the INSTALL document.

libcurl is the library curl is using to do its job. It is readily available to be used by your software. Read the libcurl manpage to learn how.

Open Source

curl is Open Source and is distributed under an MIT-like license.

Contact

Contact us on a suitable mailing list or use GitHub issues/ pull requests/ discussions.

All contributors to the project are listed in the THANKS document.

Commercial support

For commercial support, maybe private and dedicated help with your problems or applications using (lib)curl visit the support page.

Website

Visit the curl website for the latest news and downloads.

Source code

Download the latest source from the Git server:

git clone https://github.com/curl/curl.git

Security problems

Report suspected security problems via our HackerOne page and not in public.

Notice

curl contains pieces of source code that is Copyright (c) 1998, 1999 Kungliga Tekniska Högskolan. This notice is included here to comply with the distribution terms.

Backers

Thank you to all our backers 🙏 Become a backer.

Sponsors

Support this project by becoming a sponsor.