SSLCERTS: converted to markdown

Only minor edits to make it generate nice HTML output using markdown, as
this document serves both in source release tarballs as on the web site.

URL: http://curl.haxx.se/docs/sslcerts.html
This commit is contained in:
Daniel Stenberg 2014-09-09 23:46:58 +02:00
parent 9e6c3638e6
commit 4455f1f599
1 changed files with 22 additions and 24 deletions

View File

@ -1,5 +1,5 @@
Peer SSL Certificate Verification Peer SSL Certificate Verification
================================= =================================
(NOTE: If libcurl was built with Schannel or Secure Transport support, then (NOTE: If libcurl was built with Schannel or Secure Transport support, then
this does not apply to you. Scroll down for details on how the OS-native this does not apply to you. Scroll down for details on how the OS-native
@ -26,13 +26,13 @@ impersonating your favorite site, and you want to transfer files from this
server, do one of the following: server, do one of the following:
1. Tell libcurl to *not* verify the peer. With libcurl you disable this with 1. Tell libcurl to *not* verify the peer. With libcurl you disable this with
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, FALSE); `curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, FALSE);`
With the curl command line tool, you disable this with -k/--insecure. With the curl command line tool, you disable this with -k/--insecure.
2. Get a CA certificate that can verify the remote server and use the proper 2. Get a CA certificate that can verify the remote server and use the proper
option to point out this CA cert for verification when connecting. For option to point out this CA cert for verification when connecting. For
libcurl hackers: curl_easy_setopt(curl, CURLOPT_CAPATH, capath); libcurl hackers: `curl_easy_setopt(curl, CURLOPT_CAPATH, capath);`
With the curl command line tool: --cacert [file] With the curl command line tool: --cacert [file]
@ -46,32 +46,32 @@ server, do one of the following:
If you use Internet Explorer, this is one way to get extract the CA cert If you use Internet Explorer, this is one way to get extract the CA cert
for a particular server: for a particular server:
o View the certificate by double-clicking the padlock - View the certificate by double-clicking the padlock
o Find out where the CA certificate is kept (Certificate> - Find out where the CA certificate is kept (Certificate>
Authority Information Access>URL) Authority Information Access>URL)
o Get a copy of the crt file using curl - Get a copy of the crt file using curl
o Convert it from crt to PEM using the openssl tool: - Convert it from crt to PEM using the openssl tool:
openssl x509 -inform DES -in yourdownloaded.crt \ openssl x509 -inform DES -in yourdownloaded.crt \
-out outcert.pem -text -out outcert.pem -text
o Append the 'outcert.pem' to the CA cert bundle or use it stand-alone - Append the 'outcert.pem' to the CA cert bundle or use it stand-alone
as described below. as described below.
If you use the 'openssl' tool, this is one way to get extract the CA cert If you use the 'openssl' tool, this is one way to get extract the CA cert
for a particular server: for a particular server:
o openssl s_client -connect xxxxx.com:443 |tee logfile - `openssl s_client -connect xxxxx.com:443 |tee logfile`
o type "QUIT", followed by the "ENTER" key - type "QUIT", followed by the "ENTER" key
o The certificate will have "BEGIN CERTIFICATE" and "END CERTIFICATE" - The certificate will have "BEGIN CERTIFICATE" and "END CERTIFICATE"
markers. markers.
o If you want to see the data in the certificate, you can do: "openssl - If you want to see the data in the certificate, you can do: "openssl
x509 -inform PEM -in certfile -text -out certdata" where certfile is x509 -inform PEM -in certfile -text -out certdata" where certfile is
the cert you extracted from logfile. Look in certdata. the cert you extracted from logfile. Look in certdata.
o If you want to trust the certificate, you can append it to your - If you want to trust the certificate, you can append it to your
cert_bundle or use it stand-alone as described. Just remember that the cert bundle or use it stand-alone as described. Just remember that the
security is no better than the way you obtained the certificate. security is no better than the way you obtained the certificate.
4. If you're using the curl command line tool, you can specify your own CA 4. If you're using the curl command line tool, you can specify your own CA
cert path by setting the environment variable CURL_CA_BUNDLE to the path cert path by setting the environment variable `CURL_CA_BUNDLE` to the path
of your choice. of your choice.
If you're using the curl command line tool on Windows, curl will search If you're using the curl command line tool on Windows, curl will search
@ -86,9 +86,7 @@ server, do one of the following:
5. Get a better/different/newer CA cert bundle! One option is to extract the 5. Get a better/different/newer CA cert bundle! One option is to extract the
one a recent Firefox browser uses by running 'make ca-bundle' in the curl one a recent Firefox browser uses by running 'make ca-bundle' in the curl
build tree root, or possibly download a version that was generated this build tree root, or possibly download a version that was generated this
way for you: way for you: [CA Extract](http://curl.haxx.se/docs/caextract.html)
http://curl.haxx.se/docs/caextract.html
Neglecting to use one of the above methods when dealing with a server using a Neglecting to use one of the above methods when dealing with a server using a
certificate that isn't signed by one of the certificates in the installed CA certificate that isn't signed by one of the certificates in the installed CA
@ -96,15 +94,15 @@ cert bundle, will cause SSL to report an error ("certificate verify failed")
during the handshake and SSL will then refuse further communication with that during the handshake and SSL will then refuse further communication with that
server. server.
Peer SSL Certificate Verification with NSS Peer SSL Certificate Verification with NSS
========================================== ==========================================
If libcurl was built with NSS support, then depending on the OS distribution, If libcurl was built with NSS support, then depending on the OS distribution,
it is probably required to take some additional steps to use the system-wide CA it is probably required to take some additional steps to use the system-wide CA
cert db. RedHat ships with an additional module, libnsspem.so, which enables cert db. RedHat ships with an additional module, libnsspem.so, which enables
NSS to read the OpenSSL PEM CA bundle. This library is missing in OpenSuSE, and NSS to read the OpenSSL PEM CA bundle. This library is missing in OpenSuSE, and
without it, NSS can only work with its own internal formats. NSS also has a new without it, NSS can only work with its own internal formats. NSS also has a new
database format: https://wiki.mozilla.org/NSS_Shared_DB [database format](https://wiki.mozilla.org/NSS_Shared_DB).
Starting with version 7.19.7, libcurl automatically adds the 'sql:' prefix to Starting with version 7.19.7, libcurl automatically adds the 'sql:' prefix to
the certdb directory (either the hardcoded default /etc/pki/nssdb or the the certdb directory (either the hardcoded default /etc/pki/nssdb or the
@ -114,8 +112,8 @@ format your distribution provides, examine the default certdb location:
cert9.db, key4.db, pkcs11.txt; filenames of older versions are cert8.db, cert9.db, key4.db, pkcs11.txt; filenames of older versions are cert8.db,
key3.db, secmod.db. key3.db, secmod.db.
Peer SSL Certificate Verification with Schannel and Secure Transport Peer SSL Certificate Verification with Schannel and Secure Transport
==================================================================== ====================================================================
If libcurl was built with Schannel (Microsoft's TLS/SSL engine) or Secure If libcurl was built with Schannel (Microsoft's TLS/SSL engine) or Secure
Transport (Apple's TLS/SSL engine) support, then libcurl will still perform Transport (Apple's TLS/SSL engine) support, then libcurl will still perform