openssl - Git for Windows: SSL certificate problem: certificate has expired

Question

I am aware that Let's Encrypt made changes that may impact older clients because a root certificate would expire. See DST Root CA X3 Expiration (September 2021).

However, I didn't think this could impact me because my development machine is up-to-date.

But since today I get the message while doing a git pull:

fatal: unable to access 'https://git.company.tld/project.git/': SSL certificate problem: certificate has expired

I just downloaded the newest Git for Windows (2.33.0) and confirmed that the built-in OpenSSL is up-to-date (OpenSSL 1.1.1k 25 Mar 2021) which should be good.

OpenSSL Client Compatibility Changes for Let’s Encrypt Certificates

But the error seems to stay.

openssl s_client -showcerts -connect git.company.tld:443

shows

CONNECTED(000001A0)
---
Certificate chain
 0 s:CN = git.company.tld
   i:C = US, O = Let's Encrypt, CN = R3
-----BEGIN CERTIFICATE-----
...
-----END CERTIFICATE-----
 1 s:C = US, O = Let's Encrypt, CN = R3
   i:O = Digital Signature Trust Co., CN = DST Root CA X3
-----BEGIN CERTIFICATE-----
...
-----END CERTIFICATE-----
---
Server certificate
subject=CN = git.company.tld

issuer=C = US, O = Let's Encrypt, CN = R3

---
No client certificate CA names sent
Peer signing digest: SHA512
Peer signature type: RSA
Server Temp Key: ECDH, P-256, 256 bits
---
SSL handshake has read 3058 bytes and written 443 bytes
Verification error: certificate has expired
---
New, TLSv1.2, Cipher is ECDHE-RSA-AES256-GCM-SHA384
Server public key is 2048 bit
Secure Renegotiation IS supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
SSL-Session:
    Protocol  : TLSv1.2
    Cipher    : ECDHE-RSA-AES256-GCM-SHA384
    Session-ID: ...
    Session-ID-ctx:
    Master-Key: ...
    PSK identity: None
    PSK identity hint: None
    SRP username: None
    Start Time: 1632982992
    Timeout   : 7200 (sec)
    Verify return code: 10 (certificate has expired)
    Extended master secret: no
---

The problem is not with the issued certificate itself which is not expired and accepted by Chrome (Windows certificate store) and Firefox.

Answer 1

On my Ubuntu 16.04.6 LTS (Xenial Xerus) machine, the solution was to remove the DST Root CA X3 certificate by running the following two commands:

sudo rm /usr/share/ca-certificates/mozilla/DST_Root_CA_X3.crt
sudo update-ca-certificates

---

On my Mac OS X 10.13.6 (High Sierra) machine, cURL (and therefore Git) rely on the /etc/ssl/cert.pem file for root CA verification.

The solution was to remove the DST Root CA X3 certificate, which expired today, from the file:

Certificate:
    Data:
        Version: 3 (0x2)
        Serial Number:
            44:af:b0:80:d6:a3:27:ba:89:30:39:86:2e:f8:40:6b
    Signature Algorithm: sha1WithRSAEncryption
        Issuer: O=Digital Signature Trust Co., CN=DST Root CA X3
        Validity
            Not Before: Sep 30 21:12:19 2000 GMT
            Not After : Sep 30 14:01:15 2021 GMT
        Subject: O=Digital Signature Trust Co., CN=DST Root CA X3
        Subject Public Key Info:
            Public Key Algorithm: rsaEncryption
                Public-Key: (2048 bit)
                Modulus:
                    00:df:af:e9:97:50:08:83:57:b4:cc:62:65:f6:90:
                    82:ec:c7:d3:2c:6b:30:ca:5b:ec:d9:c3:7d:c7:40:
                    c1:18:14:8b:e0:e8:33:76:49:2a:e3:3f:21:49:93:
                    ac:4e:0e:af:3e:48:cb:65:ee:fc:d3:21:0f:65:d2:
                    2a:d9:32:8f:8c:e5:f7:77:b0:12:7b:b5:95:c0:89:
                    a3:a9:ba:ed:73:2e:7a:0c:06:32:83:a2:7e:8a:14:
                    30:cd:11:a0:e1:2a:38:b9:79:0a:31:fd:50:bd:80:
                    65:df:b7:51:63:83:c8:e2:88:61:ea:4b:61:81:ec:
                    52:6b:b9:a2:e2:4b:1a:28:9f:48:a3:9e:0c:da:09:
                    8e:3e:17:2e:1e:dd:20:df:5b:c6:2a:8a:ab:2e:bd:
                    70:ad:c5:0b:1a:25:90:74:72:c5:7b:6a:ab:34:d6:
                    30:89:ff:e5:68:13:7b:54:0b:c8:d6:ae:ec:5a:9c:
                    92:1e:3d:64:b3:8c:c6:df:bf:c9:41:70:ec:16:72:
                    d5:26:ec:38:55:39:43:d0:fc:fd:18:5c:40:f1:97:
                    eb:d5:9a:9b:8d:1d:ba:da:25:b9:c6:d8:df:c1:15:
                    02:3a:ab:da:6e:f1:3e:2e:f5:5c:08:9c:3c:d6:83:
                    69:e4:10:9b:19:2a:b6:29:57:e3:e5:3d:9b:9f:f0:
                    02:5d
                Exponent: 65537 (0x10001)
        X509v3 extensions:
            X509v3 Basic Constraints: critical
                CA:TRUE
            X509v3 Key Usage: critical
                Certificate Sign, CRL Sign
            X509v3 Subject Key Identifier:
                C4:A7:B1:A4:7B:2C:71:FA:DB:E1:4B:90:75:FF:C4:15:60:85:89:10
    Signature Algorithm: sha1WithRSAEncryption
         a3:1a:2c:9b:17:00:5c:a9:1e:ee:28:66:37:3a:bf:83:c7:3f:
         4b:c3:09:a0:95:20:5d:e3:d9:59:44:d2:3e:0d:3e:bd:8a:4b:
         a0:74:1f:ce:10:82:9c:74:1a:1d:7e:98:1a:dd:cb:13:4b:b3:
         20:44:e4:91:e9:cc:fc:7d:a5:db:6a:e5:fe:e6:fd:e0:4e:dd:
         b7:00:3a:b5:70:49:af:f2:e5:eb:02:f1:d1:02:8b:19:cb:94:
         3a:5e:48:c4:18:1e:58:19:5f:1e:02:5a:f0:0c:f1:b1:ad:a9:
         dc:59:86:8b:6e:e9:91:f5:86:ca:fa:b9:66:33:aa:59:5b:ce:
         e2:a7:16:73:47:cb:2b:cc:99:b0:37:48:cf:e3:56:4b:f5:cf:
         0f:0c:72:32:87:c6:f0:44:bb:53:72:6d:43:f5:26:48:9a:52:
         67:b7:58:ab:fe:67:76:71:78:db:0d:a2:56:14:13:39:24:31:
         85:a2:a8:02:5a:30:47:e1:dd:50:07:bc:02:09:90:00:eb:64:
         63:60:9b:16:bc:88:c9:12:e6:d2:7d:91:8b:f9:3d:32:8d:65:
         b4:e9:7c:b1:57:76:ea:c5:b6:28:39:bf:15:65:1c:c8:f6:77:
         96:6a:0a:8d:77:0b:d8:91:0b:04:8e:07:db:29:b6:0a:ee:9d:
         82:35:35:10
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

After removing the entire code snippet above from the file and saving it, the error went away.