connection: shutdown TLS (for FTP) better

This adds connection shutdown infrastructure and first use for FTP. FTP
data connections, when not encountering an error, are now shut down in a

connection: shutdown TLS (for FTP) better

This adds connection shutdown infrastructure and first use for FTP. FTP
data connections, when not encountering an error, are now shut down in a
blocking way with a 2sec timeout.

- add cfilter `Curl_cft_shutdown` callback
- keep a shutdown start timestamp and timeout at connectdata
- provide shutdown timeout default and member in
`data->set.shutdowntimeout`.
- provide methods for starting, interrogating and clearing
shutdown timers
- provide `Curl_conn_shutdown_blocking()` to shutdown the
`sockindex` filter chain in a blocking way. Use that in FTP.
- add `Curl_conn_cf_poll()` to wait for socket events during
shutdown of a connection filter chain.
This gets the monitoring sockets and events via the filters
"adjust_pollset()" methods. This gives correct behaviour when
shutting down a TLS connection through a HTTP/2 proxy.
- Implement shutdown for all socket filters
- for HTTP/2 and h2 proxying to send GOAWAY
- for TLS backends to the best of their capabilities
- for tcp socket filter to make a final, nonblocking
receive to avoid unwanted RST states
- add shutdown forwarding to happy eyeballers and
https connect ballers when applicable.

Closes #13904

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gnutls: support CA caching

- similar to openssl, use a shared 'credentials' instance
among TLS connections with a plain configuration.
- different to openssl, a connection with a c

gnutls: support CA caching

- similar to openssl, use a shared 'credentials' instance
among TLS connections with a plain configuration.
- different to openssl, a connection with a client certificate
is not eligible to sharing.
- document CURLOPT_CA_CACHE_TIMEOUT in man page

Closes #13795

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gnutls: lazy init the trust settings

- delay loading of trust anchors and CRLs after the ClientHello
has been sent off
- add tracing to IO operations
- on IO errors, return the

gnutls: lazy init the trust settings

- delay loading of trust anchors and CRLs after the ClientHello
has been sent off
- add tracing to IO operations
- on IO errors, return the CURLcode of the underlying filter

Closes #13339

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tls: use shared init code for TCP+QUIC

Closes #13172

vtls/vquic, keep peer name information together

- add `struct ssl_peer` to keep hostname, dispname and sni
for a filter
- allocate `sni` for use in VTLS backend
- eliminate `Cu

vtls/vquic, keep peer name information together

- add `struct ssl_peer` to keep hostname, dispname and sni
for a filter
- allocate `sni` for use in VTLS backend
- eliminate `Curl_ssl_snihost()` and its use of the download buffer
- use ssl_peer in SSL and QUIC filters

Closes #12349

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copyright: update all copyright lines and remove year ranges

- they are mostly pointless in all major jurisdictions
- many big corporations and projects already don't use them
- save

copyright: update all copyright lines and remove year ranges

- they are mostly pointless in all major jurisdictions
- many big corporations and projects already don't use them
- saves us from pointless churn
- git keeps history for us
- the year range is kept in COPYING

checksrc is updated to allow non-year using copyright statements

Closes #10205

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gnutls: use common gnutls init and verify code for ngtcp2

Closes #10007

vtls: localization of state data in filters

- almost all backend calls pass the Curl_cfilter intance instead of
connectdata+sockindex
- ssl_connect_data is remove from struct co

vtls: localization of state data in filters

- almost all backend calls pass the Curl_cfilter intance instead of
connectdata+sockindex
- ssl_connect_data is remove from struct connectdata and made internal
to vtls
- ssl_connect_data is allocated in the added filter, kept at cf->ctx

- added function to let a ssl filter access its ssl_primary_config and
ssl_config_data this selects the propert subfields in conn and data,
for filters added as plain or proxy
- adjusted all backends to use the changed api
- adjusted all backends to access config data via the exposed
functions, no longer using conn or data directly

cfilter renames for clear purpose:

- methods `Curl_conn_*(data, conn, sockindex)` work on the complete
filter chain at `sockindex` and connection `conn`.
- methods `Curl_cf_*(cf, ...)` work on a specific Curl_cfilter
instance.
- methods `Curl_conn_cf()` work on/with filter instances at a
connection.
- rebased and resolved some naming conflicts
- hostname validation (und session lookup) on SECONDARY use the same
name as on FIRST (again).

new debug macros and removing connectdata from function signatures where not
needed.

adapting schannel for new Curl_read_plain paramter.

Closes #9919

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copyright: make repository REUSE compliant

Add licensing and copyright information for all files in this repository. This
either happens in the file itself as a comment header or in the

copyright: make repository REUSE compliant

Add licensing and copyright information for all files in this repository. This
either happens in the file itself as a comment header or in the file
`.reuse/dep5`.

This commit also adds a Github workflow to check pull requests and adapts
copyright.pl to the changes.

Closes #8869

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gtls: add gnutls include for the session type

Follow-up to 8fbd6feddfa5 to make it build more universally

ngtcp2: verify the server certificate for the gnutls case

Closes #8178

copyright: fix year ranges

Follow-up from 4d2f8006777

curl.se: new home

Closes #6172

vtls: fold the backend ID into the Curl_ssl structure

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

vtls: remove obsolete declarations of SSL backend functionality

These functions are all available via the Curl_ssl struct now, no need
to declare them separately anymore.

As the

vtls: remove obsolete declarations of SSL backend functionality

These functions are all available via the Curl_ssl struct now, no need
to declare them separately anymore.

As the global declarations are removed, the corresponding function
definitions are marked as file-local. The only two exceptions here are
Curl_mbedtls_shutdown() and Curl_polarssl_shutdown(): only the
declarations were removed, there are no function definitions to mark
file-local.

Please note that Curl_nss_force_init() is *still* declared globally, as
the only SSL backend-specific function, because it was introduced
specifically for the use case where cURL was compiled with
`--without-ssl --with-nss`. For details, see f3b77e561 (http_ntlm: add
support for NSS, 2010-06-27).

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

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vtls: move the SUPPORT_HTTPS_PROXY flag into the Curl_ssl struct

That will allow us to choose the SSL backend at runtime.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx

vtls: move the SUPPORT_HTTPS_PROXY flag into the Curl_ssl struct

That will allow us to choose the SSL backend at runtime.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

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vtls: convert the have_curlssl_* constants to runtime flags

The entire idea of introducing the Curl_ssl struct to describe SSL
backends is to prepare for choosing the SSL backend at runt

vtls: convert the have_curlssl_* constants to runtime flags

The entire idea of introducing the Curl_ssl struct to describe SSL
backends is to prepare for choosing the SSL backend at runtime.

To that end, convert all the #ifdef have_curlssl_* style conditionals
to use bit flags instead.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

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vtls: move sha256sum into the Curl_ssl struct

The SHA-256 checksumming is also an SSL backend-specific function.
Let's include it in the struct declaring the functionality of SSL
bac

vtls: move sha256sum into the Curl_ssl struct

The SHA-256 checksumming is also an SSL backend-specific function.
Let's include it in the struct declaring the functionality of SSL
backends.

In contrast to MD5, there is no fall-back code. To indicate this, the
respective entries are NULL for those backends that offer no support for
SHA-256 checksumming.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

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vtls: move md5sum into the Curl_ssl struct

The MD5 summing is also an SSL backend-specific function. So let's
include it, offering the previous fall-back code as a separate function

vtls: move md5sum into the Curl_ssl struct

The MD5 summing is also an SSL backend-specific function. So let's
include it, offering the previous fall-back code as a separate function
now: Curl_none_md5sum(). To allow for that, the signature had to be
changed so that an error could be returned from the implementation
(Curl_none_md5sum() can run out of memory).

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

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vtls: use the Curl_ssl struct to access all SSL backends' functionality

This is the first step to unify the SSL backend handling. Now all the
SSL backend-specific functionality is access

vtls: use the Curl_ssl struct to access all SSL backends' functionality

This is the first step to unify the SSL backend handling. Now all the
SSL backend-specific functionality is accessed via a global instance of
the Curl_ssl struct.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

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vtls: declare Curl_ssl structs for every SSL backend

The idea of introducing the Curl_ssl struct was to unify how the SSL
backends are declared and called. To this end, we now provide an

vtls: declare Curl_ssl structs for every SSL backend

The idea of introducing the Curl_ssl struct was to unify how the SSL
backends are declared and called. To this end, we now provide an
instance of the Curl_ssl struct for each and every SSL backend.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

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vtls: make sure all _cleanup() functions return void

This patch makes the signature of the _cleanup() functions consistent
among the SSL backends, in preparation for unifying the way all

vtls: make sure all _cleanup() functions return void

This patch makes the signature of the _cleanup() functions consistent
among the SSL backends, in preparation for unifying the way all SSL
backends are accessed.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

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rand: make it work without TLS backing

Regression introduced in commit f682156a4fc6c4

Reported-by: John Kohl
Bug: https://curl.haxx.se/mail/lib-2017-01/0055.html

curl_version_info: add CURL_VERSION_HTTPS_PROXY

Closes #1142

proxy: Support HTTPS proxy and SOCKS+HTTP(s)

* HTTPS proxies:

An HTTPS proxy receives all transactions over an SSL/TLS connection.
Once a secure connection with the proxy is est

proxy: Support HTTPS proxy and SOCKS+HTTP(s)

* HTTPS proxies:

An HTTPS proxy receives all transactions over an SSL/TLS connection.
Once a secure connection with the proxy is established, the user agent
uses the proxy as usual, including sending CONNECT requests to instruct
the proxy to establish a [usually secure] TCP tunnel with an origin
server. HTTPS proxies protect nearly all aspects of user-proxy
communications as opposed to HTTP proxies that receive all requests
(including CONNECT requests) in vulnerable clear text.

With HTTPS proxies, it is possible to have two concurrent _nested_
SSL/TLS sessions: the "outer" one between the user agent and the proxy
and the "inner" one between the user agent and the origin server
(through the proxy). This change adds supports for such nested sessions
as well.

A secure connection with a proxy requires its own set of the usual SSL
options (their actual descriptions differ and need polishing, see TODO):

--proxy-cacert FILE CA certificate to verify peer against
--proxy-capath DIR CA directory to verify peer against
--proxy-cert CERT[:PASSWD] Client certificate file and password
--proxy-cert-type TYPE Certificate file type (DER/PEM/ENG)
--proxy-ciphers LIST SSL ciphers to use
--proxy-crlfile FILE Get a CRL list in PEM format from the file
--proxy-insecure Allow connections to proxies with bad certs
--proxy-key KEY Private key file name
--proxy-key-type TYPE Private key file type (DER/PEM/ENG)
--proxy-pass PASS Pass phrase for the private key
--proxy-ssl-allow-beast Allow security flaw to improve interop
--proxy-sslv2 Use SSLv2
--proxy-sslv3 Use SSLv3
--proxy-tlsv1 Use TLSv1
--proxy-tlsuser USER TLS username
--proxy-tlspassword STRING TLS password
--proxy-tlsauthtype STRING TLS authentication type (default SRP)

All --proxy-foo options are independent from their --foo counterparts,
except --proxy-crlfile which defaults to --crlfile and --proxy-capath
which defaults to --capath.

Curl now also supports %{proxy_ssl_verify_result} --write-out variable,
similar to the existing %{ssl_verify_result} variable.

Supported backends: OpenSSL, GnuTLS, and NSS.

* A SOCKS proxy + HTTP/HTTPS proxy combination:

If both --socks* and --proxy options are given, Curl first connects to
the SOCKS proxy and then connects (through SOCKS) to the HTTP or HTTPS
proxy.

TODO: Update documentation for the new APIs and --proxy-* options.
Look for "Added in 7.XXX" marks.

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