mirror of
https://github.com/moparisthebest/curl
synced 2024-12-21 23:58:49 -05:00
0f1996321f
The tool was never called cURL, only the project. But even so, we have more and more over time switched to just use lower case.
1182 lines
42 KiB
Plaintext
1182 lines
42 KiB
Plaintext
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/ __| | | | |_) | |
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\___|\___/|_| \_\_____|
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Things that could be nice to do in the future
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Things to do in project cURL. Please tell us what you think, contribute and
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send us patches that improve things!
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Be aware that these are things that we could do, or have once been considered
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things we could do. If you want to work on any of these areas, please
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consider bringing it up for discussions first on the mailing list so that we
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all agree it is still a good idea for the project!
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All bugs documented in the KNOWN_BUGS document are subject for fixing!
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1. libcurl
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1.2 More data sharing
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1.3 struct lifreq
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1.4 signal-based resolver timeouts
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1.5 get rid of PATH_MAX
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1.6 Modified buffer size approach
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1.7 Detect when called from within callbacks
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1.8 Allow SSL (HTTPS) to proxy
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1.9 Cache negative name resolves
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1.10 Support IDNA2008
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1.11 minimize dependencies with dynamicly loaded modules
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1.12 have form functions use CURL handle argument
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1.14 Typesafe curl_easy_setopt()
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1.15 Monitor connections in the connection pool
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1.16 Try to URL encode given URL
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1.17 Add support for IRIs
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1.18 try next proxy if one doesn't work
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1.19 Timeout idle connections from the pool
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1.20 SRV and URI DNS records
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1.21 API for URL parsing/splitting
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1.23 Offer API to flush the connection pool
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1.24 TCP Fast Open for windows
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2. libcurl - multi interface
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2.1 More non-blocking
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2.2 Better support for same name resolves
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2.3 Non-blocking curl_multi_remove_handle()
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2.4 Split connect and authentication process
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2.5 Edge-triggered sockets should work
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3. Documentation
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3.1 Update date and version in man pages
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3.2 Provide cmake config-file
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4. FTP
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4.1 HOST
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4.2 Alter passive/active on failure and retry
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4.3 Earlier bad letter detection
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4.4 REST for large files
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4.5 ASCII support
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4.6 GSSAPI via Windows SSPI
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4.7 STAT for LIST without data connection
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5. HTTP
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5.1 Better persistency for HTTP 1.0
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5.2 support FF3 sqlite cookie files
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5.3 Rearrange request header order
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5.4 Use huge HTTP/2 windows
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5.5 auth= in URLs
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5.6 Refuse "downgrade" redirects
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5.7 Brotli compression
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5.8 QUIC
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5.9 Add easy argument to formpost functions
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5.10 Leave secure cookies alone
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6. TELNET
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6.1 ditch stdin
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6.2 ditch telnet-specific select
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6.3 feature negotiation debug data
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6.4 send data in chunks
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7. SMTP
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7.1 Pipelining
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7.2 Enhanced capability support
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7.3 Add CURLOPT_MAIL_CLIENT option
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8. POP3
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8.1 Pipelining
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8.2 Enhanced capability support
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9. IMAP
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9.1 Enhanced capability support
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10. LDAP
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10.1 SASL based authentication mechanisms
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11. SMB
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11.1 File listing support
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11.2 Honor file timestamps
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11.3 Use NTLMv2
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11.4 Create remote directories
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12. New protocols
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12.1 RSYNC
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13. SSL
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13.1 Disable specific versions
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13.2 Provide mutex locking API
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13.3 Evaluate SSL patches
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13.4 Cache OpenSSL contexts
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13.5 Export session ids
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13.6 Provide callback for cert verification
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13.7 improve configure --with-ssl
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13.8 Support DANE
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13.9 Support TLS v1.3
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13.10 Support SSLKEYLOGFILE
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13.11 Support intermediate & root pinning for PINNEDPUBLICKEY
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13.12 Support HSTS
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13.13 Support HPKP
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14. GnuTLS
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14.1 SSL engine stuff
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14.2 check connection
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15. WinSSL/SChannel
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15.1 Add support for client certificate authentication
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15.2 Add support for custom server certificate validation
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15.3 Add support for the --ciphers option
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16. SASL
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16.1 Other authentication mechanisms
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16.2 Add QOP support to GSSAPI authentication
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16.3 Support binary messages (i.e.: non-base64)
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17. SSH protocols
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17.1 Multiplexing
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17.2 SFTP performance
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17.3 Support better than MD5 hostkey hash
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18. Command line tool
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18.1 sync
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18.2 glob posts
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18.3 prevent file overwriting
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18.4 simultaneous parallel transfers
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18.5 provide formpost headers
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18.6 warning when setting an option
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18.7 warning when sending binary output to terminal
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18.8 offer color-coded HTTP header output
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18.9 Choose the name of file in braces for complex URLs
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18.10 improve how curl works in a windows console window
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18.11 -w output to stderr
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18.12 keep running, read instructions from pipe/socket
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18.13 support metalink in http headers
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18.14 --fail without --location should treat 3xx as a failure
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18.15 Introduce --fail-fast to exit on first transfer fail
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19. Build
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19.1 roffit
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19.2 Enable PIE and RELRO by default
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20. Test suite
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20.1 SSL tunnel
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20.2 nicer lacking perl message
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20.3 more protocols supported
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20.4 more platforms supported
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20.5 Add support for concurrent connections
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20.6 Use the RFC6265 test suite
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21. Next SONAME bump
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21.1 http-style HEAD output for FTP
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21.2 combine error codes
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21.3 extend CURLOPT_SOCKOPTFUNCTION prototype
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22. Next major release
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22.1 cleanup return codes
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22.2 remove obsolete defines
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22.3 size_t
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22.4 remove several functions
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22.5 remove CURLOPT_FAILONERROR
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22.6 remove CURLOPT_DNS_USE_GLOBAL_CACHE
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22.7 remove progress meter from libcurl
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22.8 remove 'curl_httppost' from public
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==============================================================================
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1. libcurl
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1.2 More data sharing
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curl_share_* functions already exist and work, and they can be extended to
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share more. For example, enable sharing of the ares channel and the
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connection cache.
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1.3 struct lifreq
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Use 'struct lifreq' and SIOCGLIFADDR instead of 'struct ifreq' and
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SIOCGIFADDR on newer Solaris versions as they claim the latter is obsolete.
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To support IPv6 interface addresses for network interfaces properly.
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1.4 signal-based resolver timeouts
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libcurl built without an asynchronous resolver library uses alarm() to time
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out DNS lookups. When a timeout occurs, this causes libcurl to jump from the
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signal handler back into the library with a sigsetjmp, which effectively
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causes libcurl to continue running within the signal handler. This is
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non-portable and could cause problems on some platforms. A discussion on the
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problem is available at https://curl.haxx.se/mail/lib-2008-09/0197.html
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Also, alarm() provides timeout resolution only to the nearest second. alarm
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ought to be replaced by setitimer on systems that support it.
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1.5 get rid of PATH_MAX
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Having code use and rely on PATH_MAX is not nice:
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http://insanecoding.blogspot.com/2007/11/pathmax-simply-isnt.html
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Currently the SSH based code uses it a bit, but to remove PATH_MAX from there
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we need libssh2 to properly tell us when we pass in a too small buffer and
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its current API (as of libssh2 1.2.7) doesn't.
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1.6 Modified buffer size approach
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Current libcurl allocates a fixed 16K size buffer for download and an
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additional 16K for upload. They are always unconditionally part of the easy
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handle. If CRLF translations are requested, an additional 32K "scratch
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buffer" is allocated. A total of 64K transfer buffers in the worst case.
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First, while the handles are not actually in use these buffers could be freed
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so that lingering handles just kept in queues or whatever waste less memory.
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Secondly, SFTP is a protocol that needs to handle many ~30K blocks at once
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since each need to be individually acked and therefore libssh2 must be
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allowed to send (or receive) many separate ones in parallel to achieve high
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transfer speeds. A current libcurl build with a 16K buffer makes that
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impossible, but one with a 512K buffer will reach MUCH faster transfers. But
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allocating 512K unconditionally for all buffers just in case they would like
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to do fast SFTP transfers at some point is not a good solution either.
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Dynamically allocate buffer size depending on protocol in use in combination
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with freeing it after each individual transfer? Other suggestions?
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1.7 Detect when called from within callbacks
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We should set a state variable before calling callbacks, so that we
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subsequently can add code within libcurl that returns error if called within
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callbacks for when that's not supported.
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1.8 Allow SSL (HTTPS) to proxy
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To prevent local users from snooping on your traffic to the proxy. Supported
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by Firefox and Chrome already:
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https://www.chromium.org/developers/design-documents/secure-web-proxy
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See this stale work in progress branch:
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https://github.com/curl/curl/tree/HTTPS-proxy based on this PR:
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https://github.com/curl/curl/pull/305
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1.9 Cache negative name resolves
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A name resolve that has failed is likely to fail when made again within a
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short period of time. Currently we only cache positive responses.
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1.10 Support IDNA2008
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International Domain Names are supported in libcurl since years back, powered
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by libidn. libidn implements IDNA2003 which has been superseded by IDNA2008.
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libidn2 is an existing library offering support for IDNA2008.
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1.11 minimize dependencies with dynamicly loaded modules
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We can create a system with loadable modules/plug-ins, where these modules
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would be the ones that link to 3rd party libs. That would allow us to avoid
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having to load ALL dependencies since only the necessary ones for this
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app/invoke/used protocols would be necessary to load. See
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https://github.com/curl/curl/issues/349
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1.12 have form functions use CURL handle argument
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curl_formadd() and curl_formget() both currently have no CURL handle
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argument, but both can use a callback that is set in the easy handle, and
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thus curl_formget() with callback cannot function without first having
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curl_easy_perform() (or similar) called - which is hard to grasp and a design
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mistake.
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The curl_formadd() design can probably also be reconsidered to make it easier
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to use and less error-prone. Probably easiest by splitting it into several
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function calls.
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1.14 Typesafe curl_easy_setopt()
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One of the most common problems in libcurl using applications is the lack of
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type checks for curl_easy_setopt() which happens because it accepts varargs
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and thus can take any type.
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One possible solution to this is to introduce a few different versions of the
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setopt version for the different kinds of data you can set.
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curl_easy_set_num() - sets a long value
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curl_easy_set_large() - sets a curl_off_t value
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curl_easy_set_ptr() - sets a pointer
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curl_easy_set_cb() - sets a callback PLUS its callback data
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1.15 Monitor connections in the connection pool
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libcurl's connection cache or pool holds a number of open connections for the
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purpose of possible subsequent connection reuse. It may contain a few up to a
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significant amount of connections. Currently, libcurl leaves all connections
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as they are and first when a connection is iterated over for matching or
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reuse purpose it is verified that it is still alive.
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Those connections may get closed by the server side for idleness or they may
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get a HTTP/2 ping from the peer to verify that they're still alive. By adding
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monitoring of the connections while in the pool, libcurl can detect dead
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connections (and close them) better and earlier, and it can handle HTTP/2
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pings to keep such ones alive even when not actively doing transfers on them.
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1.16 Try to URL encode given URL
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Given a URL that for example contains spaces, libcurl could have an option
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that would try somewhat harder than it does now and convert spaces to %20 and
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perhaps URL encoded byte values over 128 etc (basically do what the redirect
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following code already does).
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https://github.com/curl/curl/issues/514
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1.17 Add support for IRIs
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IRIs (RFC 3987) allow localized, non-ascii, names in the URL. To properly
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support this, curl/libcurl would need to translate/encode the given input
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from the input string encoding into percent encoded output "over the wire".
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To make that work smoothly for curl users even on Windows, curl would
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probably need to be able to convert from several input encodings.
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1.18 try next proxy if one doesn't work
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Allow an application to specify a list of proxies to try, and failing to
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connect to the first go on and try the next instead until the list is
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exhausted. Browsers support this feature at least when they specify proxies
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using PACs.
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https://github.com/curl/curl/issues/896
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1.19 Timeout idle connections from the pool
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libcurl currently keeps connections in its connection pool for an indefinite
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period of time, until it either gets reused, gets noticed that it has been
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closed by the server or gets pruned to make room for a new connection.
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To reduce overhead (especially for when we add monitoring of the connections
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in the pool), we should introduce a timeout so that connections that have
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been idle for N seconds get closed.
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1.20 SRV and URI DNS records
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Offer support for resolving SRV and URI DNS records for libcurl to know which
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server to connect to for various protocols (including HTTP!).
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1.21 API for URL parsing/splitting
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libcurl has always parsed URLs internally and never exposed any API or
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features to allow applications to do it. Still most or many applications
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using libcurl need that ability. In polls to users, we've learned that many
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libcurl users would like to see and use such an API.
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1.23 Offer API to flush the connection pool
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Sometimes applications want to flush all the existing connections kept alive.
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An API could allow a forced flush or just a forced loop that would properly
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close all connections that have been closed by the server already.
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1.24 TCP Fast Open for windows
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libcurl supports the CURLOPT_TCP_FASTOPEN option since 7.49.0 for Linux and
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Mac OS. Windows supports TCP Fast Open starting with Windows 10, version 1607
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and we should add support for it.
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2. libcurl - multi interface
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2.1 More non-blocking
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Make sure we don't ever loop because of non-blocking sockets returning
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EWOULDBLOCK or similar. Blocking cases include:
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- Name resolves on non-windows unless c-ares is used
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- NSS SSL connections
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- HTTP proxy CONNECT operations
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- SOCKS proxy handshakes
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- file:// transfers
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- TELNET transfers
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- The "DONE" operation (post transfer protocol-specific actions) for the
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protocols SFTP, SMTP, FTP. Fixing Curl_done() for this is a worthy task.
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2.2 Better support for same name resolves
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If a name resolve has been initiated for name NN and a second easy handle
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wants to resolve that name as well, make it wait for the first resolve to end
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up in the cache instead of doing a second separate resolve. This is
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especially needed when adding many simultaneous handles using the same host
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name when the DNS resolver can get flooded.
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2.3 Non-blocking curl_multi_remove_handle()
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The multi interface has a few API calls that assume a blocking behavior, like
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add_handle() and remove_handle() which limits what we can do internally. The
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multi API need to be moved even more into a single function that "drives"
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everything in a non-blocking manner and signals when something is done. A
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remove or add would then only ask for the action to get started and then
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multi_perform() etc still be called until the add/remove is completed.
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2.4 Split connect and authentication process
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The multi interface treats the authentication process as part of the connect
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phase. As such any failures during authentication won't trigger the relevant
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QUIT or LOGOFF for protocols such as IMAP, POP3 and SMTP.
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2.5 Edge-triggered sockets should work
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The multi_socket API should work with edge-triggered socket events. One of
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the internal actions that need to be improved for this to work perfectly is
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the 'maxloops' handling in transfer.c:readwrite_data().
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3. Documentation
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3.1 Update date and version in man pages
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'maketgz' or another suitable script could update the .TH sections of the man
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pages at release time to use the current date and curl/libcurl version
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number.
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3.2 Provide cmake config-file
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A config-file package is a set of files provided by us to allow applications
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to write cmake scripts to find and use libcurl easier. See
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https://github.com/curl/curl/issues/885
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4. FTP
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4.1 HOST
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HOST is a command for a client to tell which host name to use, to offer FTP
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servers named-based virtual hosting:
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https://tools.ietf.org/html/rfc7151
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4.2 Alter passive/active on failure and retry
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When trying to connect passively to a server which only supports active
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connections, libcurl returns CURLE_FTP_WEIRD_PASV_REPLY and closes the
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connection. There could be a way to fallback to an active connection (and
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vice versa). https://curl.haxx.se/bug/feature.cgi?id=1754793
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4.3 Earlier bad letter detection
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Make the detection of (bad) %0d and %0a codes in FTP URL parts earlier in the
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process to avoid doing a resolve and connect in vain.
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4.4 REST for large files
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REST fix for servers not behaving well on >2GB requests. This should fail if
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the server doesn't set the pointer to the requested index. The tricky
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(impossible?) part is to figure out if the server did the right thing or not.
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4.5 ASCII support
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FTP ASCII transfers do not follow RFC959. They don't convert the data
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accordingly.
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4.6 GSSAPI via Windows SSPI
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In addition to currently supporting the SASL GSSAPI mechanism (Kerberos V5)
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via third-party GSS-API libraries, such as Heimdal or MIT Kerberos, also add
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support for GSSAPI authentication via Windows SSPI.
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4.7 STAT for LIST without data connection
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Some FTP servers allow STAT for listing directories instead of using LIST, and
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the response is then sent over the control connection instead of as the
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otherwise usedw data connection: http://www.nsftools.com/tips/RawFTP.htm#STAT
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This is not detailed in any FTP specification.
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5. HTTP
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5.1 Better persistency for HTTP 1.0
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"Better" support for persistent connections over HTTP 1.0
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https://curl.haxx.se/bug/feature.cgi?id=1089001
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5.2 support FF3 sqlite cookie files
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Firefox 3 is changing from its former format to a a sqlite database instead.
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We should consider how (lib)curl can/should support this.
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https://curl.haxx.se/bug/feature.cgi?id=1871388
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5.3 Rearrange request header order
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Server implementors often make an effort to detect browser and to reject
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clients it can detect to not match. One of the last details we cannot yet
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control in libcurl's HTTP requests, which also can be exploited to detect
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that libcurl is in fact used even when it tries to impersonate a browser, is
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the order of the request headers. I propose that we introduce a new option in
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which you give headers a value, and then when the HTTP request is built it
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sorts the headers based on that number. We could then have internally created
|
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headers use a default value so only headers that need to be moved have to be
|
|
specified.
|
|
|
|
5.4 Use huge HTTP/2 windows
|
|
|
|
We're currently using nghttp2's default window size which is terribly small
|
|
(64K). This becomes a bottle neck over high bandwidth networks. We should
|
|
instead make the window size to be very big (512MB?) as we really don't do
|
|
much flow control anyway.
|
|
|
|
5.5 auth= in URLs
|
|
|
|
Add the ability to specify the preferred authentication mechanism to use by
|
|
using ;auth=<mech> in the login part of the URL.
|
|
|
|
For example:
|
|
|
|
http://test:pass;auth=NTLM@example.com would be equivalent to specifying --user
|
|
test:pass;auth=NTLM or --user test:pass --ntlm from the command line.
|
|
|
|
Additionally this should be implemented for proxy base URLs as well.
|
|
|
|
5.6 Refuse "downgrade" redirects
|
|
|
|
See https://github.com/curl/curl/issues/226
|
|
|
|
Consider a way to tell curl to refuse to "downgrade" protocol with a redirect
|
|
and/or possibly a bit that refuses redirect to change protocol completely.
|
|
|
|
5.7 Brotli compression
|
|
|
|
Compression algorithms that perform better than gzip are being considered for
|
|
use and inclusion in existing browsers. For example 'brotli'. If servers
|
|
follow along it is a good reason for us to also allow users to take advantage
|
|
of this. The algorithm: https://github.com/google/brotli The Firefox bug:
|
|
https://bugzilla.mozilla.org/show_bug.cgi?id=366559
|
|
|
|
5.8 QUIC
|
|
|
|
The standardization process of QUIC has been taken to the IETF and can be
|
|
followed on the [IETF QUIC Mailing
|
|
list](https://www.ietf.org/mailman/listinfo/quic). I'd like us to get on the
|
|
bandwagon. Ideally, this would be done with a separate library/project to
|
|
handle the binary/framing layer in a similar fashion to how HTTP/2 is
|
|
implemented. This, to allow other projects to benefit from the work and to
|
|
thus broaden the interest and chance of others to participate.
|
|
|
|
5.9 Add easy argument to formpost functions
|
|
|
|
Make sure there's an easy handle passed in to `curl_formadd()`,
|
|
`curl_formget()` and `curl_formfree()` by adding replacement functions and
|
|
deprecating the old ones. Allows better error messages and is generally good
|
|
API hygiene.
|
|
|
|
5.10 Leave secure cookies alone
|
|
|
|
Non-secure origins (HTTP sites) should not be allowed to set or modify
|
|
cookies with the 'secure' property:
|
|
|
|
https://tools.ietf.org/html/draft-ietf-httpbis-cookie-alone-01
|
|
|
|
|
|
6. TELNET
|
|
|
|
6.1 ditch stdin
|
|
|
|
Reading input (to send to the remote server) on stdin is a crappy solution for
|
|
library purposes. We need to invent a good way for the application to be able
|
|
to provide the data to send.
|
|
|
|
6.2 ditch telnet-specific select
|
|
|
|
Move the telnet support's network select() loop go away and merge the code
|
|
into the main transfer loop. Until this is done, the multi interface won't
|
|
work for telnet.
|
|
|
|
6.3 feature negotiation debug data
|
|
|
|
Add telnet feature negotiation data to the debug callback as header data.
|
|
|
|
6.4 send data in chunks
|
|
|
|
Currently, telnet sends data one byte at a time. This is fine for interactive
|
|
use, but inefficient for any other. Sent data should be sent in larger
|
|
chunks.
|
|
|
|
7. SMTP
|
|
|
|
7.1 Pipelining
|
|
|
|
Add support for pipelining emails.
|
|
|
|
7.2 Enhanced capability support
|
|
|
|
Add the ability, for an application that uses libcurl, to obtain the list of
|
|
capabilities returned from the EHLO command.
|
|
|
|
7.3 Add CURLOPT_MAIL_CLIENT option
|
|
|
|
Rather than use the URL to specify the mail client string to present in the
|
|
HELO and EHLO commands, libcurl should support a new CURLOPT specifically for
|
|
specifying this data as the URL is non-standard and to be honest a bit of a
|
|
hack ;-)
|
|
|
|
Please see the following thread for more information:
|
|
https://curl.haxx.se/mail/lib-2012-05/0178.html
|
|
|
|
|
|
8. POP3
|
|
|
|
8.1 Pipelining
|
|
|
|
Add support for pipelining commands.
|
|
|
|
8.2 Enhanced capability support
|
|
|
|
Add the ability, for an application that uses libcurl, to obtain the list of
|
|
capabilities returned from the CAPA command.
|
|
|
|
9. IMAP
|
|
|
|
9.1 Enhanced capability support
|
|
|
|
Add the ability, for an application that uses libcurl, to obtain the list of
|
|
capabilities returned from the CAPABILITY command.
|
|
|
|
10. LDAP
|
|
|
|
10.1 SASL based authentication mechanisms
|
|
|
|
Currently the LDAP module only supports ldap_simple_bind_s() in order to bind
|
|
to an LDAP server. However, this function sends username and password details
|
|
using the simple authentication mechanism (as clear text). However, it should
|
|
be possible to use ldap_bind_s() instead specifying the security context
|
|
information ourselves.
|
|
|
|
11. SMB
|
|
|
|
11.1 File listing support
|
|
|
|
Add support for listing the contents of a SMB share. The output should probably
|
|
be the same as/similar to FTP.
|
|
|
|
11.2 Honor file timestamps
|
|
|
|
The timestamp of the transferred file should reflect that of the original file.
|
|
|
|
11.3 Use NTLMv2
|
|
|
|
Currently the SMB authentication uses NTLMv1.
|
|
|
|
11.4 Create remote directories
|
|
|
|
Support for creating remote directories when uploading a file to a directory
|
|
that doesn't exist on the server, just like --ftp-create-dirs.
|
|
|
|
12. New protocols
|
|
|
|
12.1 RSYNC
|
|
|
|
There's no RFC for the protocol or an URI/URL format. An implementation
|
|
should most probably use an existing rsync library, such as librsync.
|
|
|
|
13. SSL
|
|
|
|
13.1 Disable specific versions
|
|
|
|
Provide an option that allows for disabling specific SSL versions, such as
|
|
SSLv2 https://curl.haxx.se/bug/feature.cgi?id=1767276
|
|
|
|
13.2 Provide mutex locking API
|
|
|
|
Provide a libcurl API for setting mutex callbacks in the underlying SSL
|
|
library, so that the same application code can use mutex-locking
|
|
independently of OpenSSL or GnutTLS being used.
|
|
|
|
13.3 Evaluate SSL patches
|
|
|
|
Evaluate/apply Gertjan van Wingerde's SSL patches:
|
|
https://curl.haxx.se/mail/lib-2004-03/0087.html
|
|
|
|
13.4 Cache OpenSSL contexts
|
|
|
|
"Look at SSL cafile - quick traces look to me like these are done on every
|
|
request as well, when they should only be necessary once per SSL context (or
|
|
once per handle)". The major improvement we can rather easily do is to make
|
|
sure we don't create and kill a new SSL "context" for every request, but
|
|
instead make one for every connection and re-use that SSL context in the same
|
|
style connections are re-used. It will make us use slightly more memory but
|
|
it will libcurl do less creations and deletions of SSL contexts.
|
|
|
|
13.5 Export session ids
|
|
|
|
Add an interface to libcurl that enables "session IDs" to get
|
|
exported/imported. Cris Bailiff said: "OpenSSL has functions which can
|
|
serialise the current SSL state to a buffer of your choice, and recover/reset
|
|
the state from such a buffer at a later date - this is used by mod_ssl for
|
|
apache to implement and SSL session ID cache".
|
|
|
|
13.6 Provide callback for cert verification
|
|
|
|
OpenSSL supports a callback for customised verification of the peer
|
|
certificate, but this doesn't seem to be exposed in the libcurl APIs. Could
|
|
it be? There's so much that could be done if it were!
|
|
|
|
13.7 improve configure --with-ssl
|
|
|
|
make the configure --with-ssl option first check for OpenSSL, then GnuTLS,
|
|
then NSS...
|
|
|
|
13.8 Support DANE
|
|
|
|
DNS-Based Authentication of Named Entities (DANE) is a way to provide SSL
|
|
keys and certs over DNS using DNSSEC as an alternative to the CA model.
|
|
https://www.rfc-editor.org/rfc/rfc6698.txt
|
|
|
|
An initial patch was posted by Suresh Krishnaswamy on March 7th 2013
|
|
(https://curl.haxx.se/mail/lib-2013-03/0075.html) but it was a too simple
|
|
approach. See Daniel's comments:
|
|
https://curl.haxx.se/mail/lib-2013-03/0103.html . libunbound may be the
|
|
correct library to base this development on.
|
|
|
|
Björn Stenberg wrote a separate initial take on DANE that was never
|
|
completed.
|
|
|
|
13.9 Support TLS v1.3
|
|
|
|
TLS version 1.3 is about to ship and is getting implemented by TLS libraries
|
|
as we speak. We should start to support the symbol and make sure all backends
|
|
handle it accordingly, then gradually add support as the TLS libraries add
|
|
the corresponding support. There may be a need to add some additional options
|
|
to allow libcurl to take advantage of the new features in 1.3.
|
|
|
|
13.10 Support SSLKEYLOGFILE
|
|
|
|
When used, Firefox and Chrome dumps their master TLS keys to the file name
|
|
this environment variable specifies. This allows tools like for example
|
|
Wireshark to capture and decipher TLS traffic to/from those clients. libcurl
|
|
could be made to support this more widely (presumably this already works when
|
|
built with NSS). Peter Wu made a OpenSSL preload to make possible that can be
|
|
used as inspiration and guidance
|
|
https://git.lekensteyn.nl/peter/wireshark-notes/tree/src/sslkeylog.c
|
|
|
|
13.11 Support intermediate & root pinning for PINNEDPUBLICKEY
|
|
|
|
CURLOPT_PINNEDPUBLICKEY does not consider the hashes of intermediate & root
|
|
certificates when comparing the pinned keys. Therefore it is not compatible
|
|
with "HTTP Public Key Pinning" as there also intermediate and root certificates
|
|
can be pinned. This is very useful as it prevents webadmins from "locking
|
|
themself out of their servers".
|
|
|
|
Adding this feature would make curls pinning 100% compatible to HPKP and allow
|
|
more flexible pinning.
|
|
|
|
13.12 Support HSTS
|
|
|
|
"HTTP Strict Transport Security" is TOFU (trust on first use), time-based
|
|
features indicated by a HTTP header send by the webserver. It is widely used
|
|
in browsers and it's purpose is to prevent insecure HTTP connections after
|
|
a previous HTTPS connection. It protects against SSLStripping attacks.
|
|
|
|
Doc: https://developer.mozilla.org/en-US/docs/Web/Security/HTTP_strict_transport_security
|
|
RFC 6797: https://tools.ietf.org/html/rfc6797
|
|
|
|
13.13 Support HPKP
|
|
|
|
"HTTP Public Key Pinning" is TOFU (trust on first use), time-based
|
|
features indicated by a HTTP header send by the webserver. It's purpose is
|
|
to prevent Man-in-the-middle attacks by trusted CAs by allowing webadmins
|
|
to specify which CAs/certificates/public keys to trust when connection to
|
|
their websites.
|
|
|
|
It can be build based on PINNEDPUBLICKEY.
|
|
|
|
Wikipedia: https://en.wikipedia.org/wiki/HTTP_Public_Key_Pinning
|
|
OWASP: https://www.owasp.org/index.php/Certificate_and_Public_Key_Pinning
|
|
Doc: https://developer.mozilla.org/de/docs/Web/Security/Public_Key_Pinning
|
|
RFC: https://tools.ietf.org/html/draft-ietf-websec-key-pinning-21
|
|
|
|
14. GnuTLS
|
|
|
|
14.1 SSL engine stuff
|
|
|
|
Is this even possible?
|
|
|
|
14.2 check connection
|
|
|
|
Add a way to check if the connection seems to be alive, to correspond to the
|
|
SSL_peak() way we use with OpenSSL.
|
|
|
|
15. WinSSL/SChannel
|
|
|
|
15.1 Add support for client certificate authentication
|
|
|
|
WinSSL/SChannel currently makes use of the OS-level system and user
|
|
certificate and private key stores. This does not allow the application
|
|
or the user to supply a custom client certificate using curl or libcurl.
|
|
|
|
Therefore support for the existing -E/--cert and --key options should be
|
|
implemented by supplying a custom certificate to the SChannel APIs, see:
|
|
- Getting a Certificate for Schannel
|
|
https://msdn.microsoft.com/en-us/library/windows/desktop/aa375447.aspx
|
|
|
|
15.2 Add support for custom server certificate validation
|
|
|
|
WinSSL/SChannel currently makes use of the OS-level system and user
|
|
certificate trust store. This does not allow the application or user to
|
|
customize the server certificate validation process using curl or libcurl.
|
|
|
|
Therefore support for the existing --cacert or --capath options should be
|
|
implemented by supplying a custom certificate to the SChannel APIs, see:
|
|
- Getting a Certificate for Schannel
|
|
https://msdn.microsoft.com/en-us/library/windows/desktop/aa375447.aspx
|
|
|
|
15.3 Add support for the --ciphers option
|
|
|
|
The cipher suites used by WinSSL/SChannel are configured on an OS-level
|
|
instead of an application-level. This does not allow the application or
|
|
the user to customize the configured cipher suites using curl or libcurl.
|
|
|
|
Therefore support for the existing --ciphers option should be implemented
|
|
by mapping the OpenSSL/GnuTLS cipher suites to the SChannel APIs, see
|
|
- Specifying Schannel Ciphers and Cipher Strengths
|
|
https://msdn.microsoft.com/en-us/library/windows/desktop/aa380161.aspx
|
|
|
|
16. SASL
|
|
|
|
16.1 Other authentication mechanisms
|
|
|
|
Add support for other authentication mechanisms such as OLP,
|
|
GSS-SPNEGO and others.
|
|
|
|
16.2 Add QOP support to GSSAPI authentication
|
|
|
|
Currently the GSSAPI authentication only supports the default QOP of auth
|
|
(Authentication), whilst Kerberos V5 supports both auth-int (Authentication
|
|
with integrity protection) and auth-conf (Authentication with integrity and
|
|
privacy protection).
|
|
|
|
16.3 Support binary messages (i.e.: non-base64)
|
|
|
|
Mandatory to support LDAP SASL authentication.
|
|
|
|
|
|
17. SSH protocols
|
|
|
|
17.1 Multiplexing
|
|
|
|
SSH is a perfectly fine multiplexed protocols which would allow libcurl to do
|
|
multiple parallel transfers from the same host using the same connection,
|
|
much in the same spirit as HTTP/2 does. libcurl however does not take
|
|
advantage of that ability but will instead always create a new connection for
|
|
new transfers even if an existing connection already exists to the host.
|
|
|
|
To fix this, libcurl would have to detect an existing connection and "attach"
|
|
the new transfer to the existing one.
|
|
|
|
17.2 SFTP performance
|
|
|
|
libcurl's SFTP transfer performance is sub par and can be improved, mostly by
|
|
the approach mentioned in "1.6 Modified buffer size approach".
|
|
|
|
17.3 Support better than MD5 hostkey hash
|
|
|
|
libcurl offers the CURLOPT_SSH_HOST_PUBLIC_KEY_MD5 option for verifying the
|
|
server's key. MD5 is generally being deprecated so we should implement
|
|
support for stronger hashing algorithms. libssh2 itself is what provides this
|
|
underlying functionality and it supports at least SHA-1 as an alternative.
|
|
SHA-1 is also being deprecated these days so we should consider workign with
|
|
libssh2 to instead offer support for SHA-256 or similar.
|
|
|
|
|
|
18. Command line tool
|
|
|
|
18.1 sync
|
|
|
|
"curl --sync http://example.com/feed[1-100].rss" or
|
|
"curl --sync http://example.net/{index,calendar,history}.html"
|
|
|
|
Downloads a range or set of URLs using the remote name, but only if the
|
|
remote file is newer than the local file. A Last-Modified HTTP date header
|
|
should also be used to set the mod date on the downloaded file.
|
|
|
|
18.2 glob posts
|
|
|
|
Globbing support for -d and -F, as in 'curl -d "name=foo[0-9]" URL'.
|
|
This is easily scripted though.
|
|
|
|
18.3 prevent file overwriting
|
|
|
|
Add an option that prevents curl from overwriting existing local files. When
|
|
used, and there already is an existing file with the target file name
|
|
(either -O or -o), a number should be appended (and increased if already
|
|
existing). So that index.html becomes first index.html.1 and then
|
|
index.html.2 etc.
|
|
|
|
18.4 simultaneous parallel transfers
|
|
|
|
The client could be told to use maximum N simultaneous parallel transfers and
|
|
then just make sure that happens. It should of course not make more than one
|
|
connection to the same remote host. This would require the client to use the
|
|
multi interface. https://curl.haxx.se/bug/feature.cgi?id=1558595
|
|
|
|
Using the multi interface would also allow properly using parallel transfers
|
|
with HTTP/2 and supporting HTTP/2 server push from the command line.
|
|
|
|
18.5 provide formpost headers
|
|
|
|
Extending the capabilities of the multipart formposting. How about leaving
|
|
the ';type=foo' syntax as it is and adding an extra tag (headers) which
|
|
works like this: curl -F "coolfiles=@fil1.txt;headers=@fil1.hdr" where
|
|
fil1.hdr contains extra headers like
|
|
|
|
Content-Type: text/plain; charset=KOI8-R"
|
|
Content-Transfer-Encoding: base64
|
|
X-User-Comment: Please don't use browser specific HTML code
|
|
|
|
which should overwrite the program reasonable defaults (plain/text,
|
|
8bit...)
|
|
|
|
18.6 warning when setting an option
|
|
|
|
Display a warning when libcurl returns an error when setting an option.
|
|
This can be useful to tell when support for a particular feature hasn't been
|
|
compiled into the library.
|
|
|
|
18.7 warning when sending binary output to terminal
|
|
|
|
Provide a way that prompts the user for confirmation before binary data is
|
|
sent to the terminal, much in the style 'less' does it.
|
|
|
|
18.8 offer color-coded HTTP header output
|
|
|
|
By offering different color output on the header name and the header
|
|
contents, they could be made more readable and thus help users working on
|
|
HTTP services.
|
|
|
|
18.9 Choose the name of file in braces for complex URLs
|
|
|
|
When using braces to download a list of URLs and you use complicated names
|
|
in the list of alternatives, it could be handy to allow curl to use other
|
|
names when saving.
|
|
|
|
Consider a way to offer that. Possibly like
|
|
{partURL1:name1,partURL2:name2,partURL3:name3} where the name following the
|
|
colon is the output name.
|
|
|
|
See https://github.com/curl/curl/issues/221
|
|
|
|
18.10 improve how curl works in a windows console window
|
|
|
|
If you pull the scrollbar when transferring with curl in a Windows console
|
|
window, the transfer is interrupted and can get disconnected. This can
|
|
probably be improved. See https://github.com/curl/curl/issues/322
|
|
|
|
18.11 -w output to stderr
|
|
|
|
-w is quite useful, but not to those of us who use curl without -o or -O
|
|
(such as for scripting through a higher level language). It would be nice to
|
|
have an option that is exactly like -w but sends it to stderr
|
|
instead. Proposed name: --write-stderr. See
|
|
https://github.com/curl/curl/issues/613
|
|
|
|
18.12 keep running, read instructions from pipe/socket
|
|
|
|
Provide an option that makes curl not exit after the last URL (or even work
|
|
without a given URL), and then make it read instructions passed on a pipe or
|
|
over a socket to make further instructions so that a second subsequent curl
|
|
invoke can talk to the still running instance and ask for transfers to get
|
|
done, and thus maintain its connection pool, DNS cache and more.
|
|
|
|
18.13 support metalink in http headers
|
|
|
|
Curl has support for downloading a metalink xml file, processing it, and then
|
|
downloading the target of the metalink. This is done via the --metalink option.
|
|
It would be nice if metalink also supported downloading via metalink
|
|
information that is stored in HTTP headers (RFC 6249). Theoretically this could
|
|
also be supported with the --metalink option.
|
|
|
|
See https://tools.ietf.org/html/rfc6249
|
|
|
|
See also https://lists.gnu.org/archive/html/bug-wget/2015-06/msg00034.html for
|
|
an implematation of this in wget.
|
|
|
|
18.14 --fail without --location should treat 3xx as a failure
|
|
|
|
To allow a command line like this to detect a redirect and consider it a
|
|
failure:
|
|
|
|
curl -v --fail -O https://example.com/curl-7.48.0.tar.gz
|
|
|
|
... --fail must treat 3xx responses as failures too. The least problematic
|
|
way to implement this is probably to add that new logic in the command line
|
|
tool only and not in the underlying CURLOPT_FAILONERROR logic.
|
|
|
|
18.15 Introduce --fail-fast to exit on first transfer fail
|
|
|
|
curl will transfer all URLs given on the command line one by one but only
|
|
returns the error code for the last transfer. Transfer failures on the first
|
|
ones will not be returned as error code etc to the shell. A --fail-fast
|
|
option would make curl exit and return an error for the first transfer that
|
|
fails.
|
|
|
|
|
|
19. Build
|
|
|
|
19.1 roffit
|
|
|
|
Consider extending 'roffit' to produce decent ASCII output, and use that
|
|
instead of (g)nroff when building src/tool_hugehelp.c
|
|
|
|
19.2 Enable PIE and RELRO by default
|
|
|
|
Especially when having programs that execute curl via the command line, PIE
|
|
renders the exploitation of memory corruption vulnerabilities a lot more
|
|
difficult. This can be attributed to the additional information leaks being
|
|
required to conduct a successful attack. RELRO, on the other hand, masks
|
|
different binary sections like the GOT as read-only and thus kills a handful
|
|
of techniques that come in handy when attackers are able to arbitrarily
|
|
overwrite memory. A few tests showed that enabling these features had close
|
|
to no impact, neither on the performance nor on the general functionality of
|
|
curl.
|
|
|
|
|
|
20. Test suite
|
|
|
|
20.1 SSL tunnel
|
|
|
|
Make our own version of stunnel for simple port forwarding to enable HTTPS
|
|
and FTP-SSL tests without the stunnel dependency, and it could allow us to
|
|
provide test tools built with either OpenSSL or GnuTLS
|
|
|
|
20.2 nicer lacking perl message
|
|
|
|
If perl wasn't found by the configure script, don't attempt to run the tests
|
|
but explain something nice why it doesn't.
|
|
|
|
20.3 more protocols supported
|
|
|
|
Extend the test suite to include more protocols. The telnet could just do FTP
|
|
or http operations (for which we have test servers).
|
|
|
|
20.4 more platforms supported
|
|
|
|
Make the test suite work on more platforms. OpenBSD and Mac OS. Remove
|
|
fork()s and it should become even more portable.
|
|
|
|
20.5 Add support for concurrent connections
|
|
|
|
Tests 836, 882 and 938 were designed to verify that separate connections aren't
|
|
used when using different login credentials in protocols that shouldn't re-use
|
|
a connection under such circumstances.
|
|
|
|
Unfortunately, ftpserver.pl doesn't appear to support multiple concurrent
|
|
connections. The read while() loop seems to loop until it receives a disconnect
|
|
from the client, where it then enters the waiting for connections loop. When
|
|
the client opens a second connection to the server, the first connection hasn't
|
|
been dropped (unless it has been forced - which we shouldn't do in these tests)
|
|
and thus the wait for connections loop is never entered to receive the second
|
|
connection.
|
|
|
|
20.6 Use the RFC6265 test suite
|
|
|
|
A test suite made for HTTP cookies (RFC 6265) by Adam Barth is available at
|
|
https://github.com/abarth/http-state/tree/master/tests
|
|
|
|
It'd be really awesome if someone would write a script/setup that would run
|
|
curl with that test suite and detect deviances. Ideally, that would even be
|
|
incorporated into our regular test suite.
|
|
|
|
|
|
21. Next SONAME bump
|
|
|
|
21.1 http-style HEAD output for FTP
|
|
|
|
#undef CURL_FTP_HTTPSTYLE_HEAD in lib/ftp.c to remove the HTTP-style headers
|
|
from being output in NOBODY requests over FTP
|
|
|
|
21.2 combine error codes
|
|
|
|
Combine some of the error codes to remove duplicates. The original
|
|
numbering should not be changed, and the old identifiers would be
|
|
macroed to the new ones in an CURL_NO_OLDIES section to help with
|
|
backward compatibility.
|
|
|
|
Candidates for removal and their replacements:
|
|
|
|
CURLE_FILE_COULDNT_READ_FILE => CURLE_REMOTE_FILE_NOT_FOUND
|
|
|
|
CURLE_FTP_COULDNT_RETR_FILE => CURLE_REMOTE_FILE_NOT_FOUND
|
|
|
|
CURLE_FTP_COULDNT_USE_REST => CURLE_RANGE_ERROR
|
|
|
|
CURLE_FUNCTION_NOT_FOUND => CURLE_FAILED_INIT
|
|
|
|
CURLE_LDAP_INVALID_URL => CURLE_URL_MALFORMAT
|
|
|
|
CURLE_TFTP_NOSUCHUSER => CURLE_TFTP_ILLEGAL
|
|
|
|
CURLE_TFTP_NOTFOUND => CURLE_REMOTE_FILE_NOT_FOUND
|
|
|
|
CURLE_TFTP_PERM => CURLE_REMOTE_ACCESS_DENIED
|
|
|
|
21.3 extend CURLOPT_SOCKOPTFUNCTION prototype
|
|
|
|
The current prototype only provides 'purpose' that tells what the
|
|
connection/socket is for, but not any protocol or similar. It makes it hard
|
|
for applications to differentiate on TCP vs UDP and even HTTP vs FTP and
|
|
similar.
|
|
|
|
22. Next major release
|
|
|
|
22.1 cleanup return codes
|
|
|
|
curl_easy_cleanup() returns void, but curl_multi_cleanup() returns a
|
|
CURLMcode. These should be changed to be the same.
|
|
|
|
22.2 remove obsolete defines
|
|
|
|
remove obsolete defines from curl/curl.h
|
|
|
|
22.3 size_t
|
|
|
|
make several functions use size_t instead of int in their APIs
|
|
|
|
22.4 remove several functions
|
|
|
|
remove the following functions from the public API:
|
|
|
|
curl_getenv
|
|
|
|
curl_mprintf (and variations)
|
|
|
|
curl_strequal
|
|
|
|
curl_strnequal
|
|
|
|
They will instead become curlx_ - alternatives. That makes the curl app
|
|
still capable of using them, by building with them from source.
|
|
|
|
These functions have no purpose anymore:
|
|
|
|
curl_multi_socket
|
|
|
|
curl_multi_socket_all
|
|
|
|
22.5 remove CURLOPT_FAILONERROR
|
|
|
|
Remove support for CURLOPT_FAILONERROR, it has gotten too kludgy and weird
|
|
internally. Let the app judge success or not for itself.
|
|
|
|
22.6 remove CURLOPT_DNS_USE_GLOBAL_CACHE
|
|
|
|
Remove support for a global DNS cache. Anything global is silly, and we
|
|
already offer the share interface for the same functionality but done
|
|
"right".
|
|
|
|
22.7 remove progress meter from libcurl
|
|
|
|
The internally provided progress meter output doesn't belong in the library.
|
|
Basically no application wants it (apart from curl) but instead applications
|
|
can and should do their own progress meters using the progress callback.
|
|
|
|
The progress callback should then be bumped as well to get proper 64bit
|
|
variable types passed to it instead of doubles so that big files work
|
|
correctly.
|
|
|
|
22.8 remove 'curl_httppost' from public
|
|
|
|
curl_formadd() was made to fill in a public struct, but the fact that the
|
|
struct is public is never really used by application for their own advantage
|
|
but instead often restricts how the form functions can or can't be modified.
|
|
|
|
Changing them to return a private handle will benefit the implementation and
|
|
allow us much greater freedoms while still maintaining a solid API and ABI.
|