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FAQ: refresh "Why do I get "certificate verify failed"

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Add more details, remove references to ancient curl version.
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Daniel Stenberg 2020-11-06 09:16:06 +01:00
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@ -913,27 +913,32 @@ FAQ
4.12 Why do I get "certificate verify failed" ?
You invoke curl 7.10 or later to communicate on a https:// URL and get an
error back looking something similar to this:
When you invoke curl and get an error 60 error back it means that curl
couldn't verify that the server's certificate was good. curl verifies the
certificate using the CA cert bundle and verifying for which names the
certficiate has been granted.
curl: (35) SSL: error:14090086:SSL routines:
SSL3_GET_SERVER_CERTIFICATE:certificate verify failed
To completely disable the certficiate verification, use -k. This does
however enable man-in-the-middle attacks and makes the transfer INSECURE.
We strongly advice against doing this for more than experiments.
Then it means that curl couldn't verify that the server's certificate was
good. curl verifies the certificate using the CA cert bundle that comes with
the curl installation.
If you get this failure with a CA cert bundle installed and used, the
server's certificate might not be signed by one of the CA's in yout CA
store. It might for example be self-signed. You then correct this problem by
obtaining a valid CA cert for the server. Or again, decrease the security by
disabling this check.
To disable the verification (which makes it act like curl did before 7.10),
use -k. This does however enable man-in-the-middle attacks.
At times, you find that the verification works in your favorite browser but
fails in curl. When this happens, the reason is usually that the server
sends an incomplete cert chain. The server is mandated to send all
"intermediate certificates" but doesn't. This typically works with browsers
anyway since they A) cache such certs and B) supports AIA which downloads
such missing certificates on demand. This is a server misconfiguration. A
good way to figure out if this is the case it to use the SSL Labs server
test and check the certificate chain: https://www.ssllabs.com/ssltest/
If you get this failure but are having a CA cert bundle installed and used,
the server's certificate is not signed by one of the CA's in the bundle. It
might for example be self-signed. You then correct this problem by obtaining
a valid CA cert for the server. Or again, decrease the security by disabling
this check.
Details are also in the SSLCERTS file in the release archives, found online
here: https://curl.se/docs/sslcerts.html
Details are also in the SSLCERTS.md document, found online here:
https://curl.se/docs/sslcerts.html
4.13 Why is curl -R on Windows one hour off?