1

We use certmonger to issue certs for backend systems, this works fine for apache but with nginx I must specify a chained cert.

getcert request -f /etc/pki/tls/certs/$(hostname).crt -k /etc/pki/tls/private/$(hostname).key -r -F /etc/pki/tls/certs/intermediate.crt 

Opt 1) Can I have certmonger save the certificate in both formats? (Preferred)

Opt 2) Can I tell nginx to chain the certs for me. (similar to how apache does)

I want to avoid writing a script, but if I must that's fine.

Example:

/etc/pki/tls/certs/$(hostname).crt

-----BEGIN CERTIFICATE-----
MIIHHjCCBgagAwIBAgIQDhG71w1UtxDQxvVAtrUspDANBgkqhkiG9w0BAQsFADBw
MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3
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MGoxCzAJBgNVBAYTAlVTMQswCQYDVQQIEwJOWTERMA8GA1UEBxMITmV3IFlvcmsx
HTAbBgNVBAoTFFN0YWNrIEV4Y2hhbmdlLCBJbmMuMRwwGgYDVQQDDBMqLnN0YWNr
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ZJM03ZEZhkQmn2jG/7LgjfwZmvfcITeADCpylf88bL+lf+vxe6cCl9CyqWgBDpsI
xpE=
-----END CERTIFICATE-----

and /etc/pki/tls/certs/intermediate.crt

-----BEGIN CERTIFICATE-----
MIIEsTCCA5mgAwIBAgIQBOHnpNxc8vNtwCtCuF0VnzANBgkqhkiG9w0BAQsFADBs
MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3
d3cuZGlnaWNlcnQuY29tMSswKQYDVQQDEyJEaWdpQ2VydCBIaWdoIEFzc3VyYW5j
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MAkGA1UEBhMCVVMxFTATBgNVBAoTDERpZ2lDZXJ0IEluYzEZMBcGA1UECxMQd3d3
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MA4GA1UdDwEB/wQEAwIBhjAdBgNVHSUEFjAUBggrBgEFBQcDAQYIKwYBBQUHAwIw
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0wGjIChBWUMo0oHjqvbsezt3tkBigAVBRQHvFwY+3sAzm2fTYS5yh+Rp/BIAV0Ae
cPUeybQ=
-----END CERTIFICATE-----

But I need them chained.

-----BEGIN CERTIFICATE-----
MIIHHjCCBgagAwIBAgIQDhG71w1UtxDQxvVAtrUspDANBgkqhkiG9w0BAQsFADBw
MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3
d3cuZGlnaWNlcnQuY29tMS8wLQYDVQQDEyZEaWdpQ2VydCBTSEEyIEhpZ2ggQXNz
dXJhbmNlIFNlcnZlciBDQTAeFw0xNjA1MjEwMDAwMDBaFw0xOTA4MTQxMjAwMDBa
MGoxCzAJBgNVBAYTAlVTMQswCQYDVQQIEwJOWTERMA8GA1UEBxMITmV3IFlvcmsx
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VW61DmE7NSQLiR4yonVpTpdAaO4jSPJxn8d+4p1sIlU2JGSk8LZSWFqaROc7KtXt
lWP4HahNRZtdwvL5dIEGGNWx+7B+XVAfY1ygc/UisldkA+a3D2+3WAtXgFZRZZ/1
CWFjKWJNMAI6ZBAtlbgSNgRYxdcdleIhPLCzkzWysfltfiBmsmgz6VCoFR4KgJo8
Gd3MeTWojBthM10SLwIDAQABo4IDuDCCA7QwHwYDVR0jBBgwFoAUUWj/kK8CB3U8
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GCoubWV0YS5zdGFja2V4Y2hhbmdlLmNvbYIWbWV0YS5zdGFja2V4Y2hhbmdlLmNv
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ZJM03ZEZhkQmn2jG/7LgjfwZmvfcITeADCpylf88bL+lf+vxe6cCl9CyqWgBDpsI
xpE=
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
MIIEsTCCA5mgAwIBAgIQBOHnpNxc8vNtwCtCuF0VnzANBgkqhkiG9w0BAQsFADBs
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0wGjIChBWUMo0oHjqvbsezt3tkBigAVBRQHvFwY+3sAzm2fTYS5yh+Rp/BIAV0Ae
cPUeybQ=
-----END CERTIFICATE-----

And since it's using dogtags, I would like it to autorenew.

4
  • AFAIK Apache will also accept the chained certificate, at least in 2.4. – Michael Hampton Jan 18 '17 at 20:40
  • correct, but I need the reverse, or a way to make the chain cert from certmonger. – Jacob Evans Jan 18 '17 at 20:41
  • You can do it yourself easily enough. cat hostname.crt intermediate.crt > chained.crt – Michael Hampton Jan 18 '17 at 20:45
  • 1
    yes I know how to combine them, for some reason adding that as the post-save command doesn't create the file. – Jacob Evans Jan 18 '17 at 20:46
1

As always, the answer is Selinux.

type=AVC msg=audit(1484834941.587:22023): avc:  denied  { execute } for  pid=21252 comm="certmonger" name="after.sh" dev="dm-0" ino=244 scontext=system_u:system_r:certmonger_t:s0 tcontext=unconfined_u:object_r:user_tmp_t:s0 tclass=file
type=SYSCALL msg=audit(1484834941.587:22023): arch=c000003e syscall=59 success=no exit=-13 a0=7f3d5b2bdb10 a1=7f3d5b2bda90 a2=7f3d5b2c08c0 a3=7f3d57f932e0 items=0 ppid=3219 pid=21252 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="certmonger" exe="/usr/sbin/certmonger" subj=system_u:system_r:certmonger_t:s0 key=(null)

A script is fine, just need to add before/after commands.

sudo ipa-getcert request -f /etc/pki/tls/certs/$(hostname).crt -k /etc/pki/tls/private/$(hostname).key -r -F /etc/pki/tls/certs/intermediate.crt -B /temp/before.sh -C /temp/after.sh

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