rlm_rest in 3.0.17: cert validation of HTTPS server not working

[Stefan Winter]

Hello,

I'm using rlm_rest to validate second-factor tokens to a
privacyIDEA server.

This worked fine with a test env in HTTP, but now doesn't
on HTTPS with cert validation enabled.

I have this on the command-line:

# openssl s_client -connect 2fa.restena.lu:443 -CAfile /usr/local/freeradius/config/raddb/mods-config/rest/trustroot.pem 
CONNECTED(00000003)
depth=2 C = US, O = DigiCert Inc, OU = www.digicert.com, CN = DigiCert Assured ID Root CA
verify return:1
depth=1 C = NL, ST = Noord-Holland, L = Amsterdam, O = TERENA, CN = TERENA SSL CA 3
verify return:1
depth=0 C = LU, L = Esch-sur-Alzette, O = Fondation RESTENA, CN = *.restena.lu
verify return:1
---
Certificate chain
 0 s:/C=LU/L=Esch-sur-Alzette/O=Fondation RESTENA/CN=*.restena.lu
   i:/C=NL/ST=Noord-Holland/L=Amsterdam/O=TERENA/CN=TERENA SSL CA 3
 1 s:/C=NL/ST=Noord-Holland/L=Amsterdam/O=TERENA/CN=TERENA SSL CA 3
   i:/C=US/O=DigiCert Inc/OU=www.digicert.com/CN=DigiCert Assured ID Root CA
---
[...]
    Verify return code: 0 (ok)

I.e. the server sends the intermediate, and the matching
root is in the trustroot.pem file.

But when I transpose this into the rlm_rest config like
this:

rest {
        tls {
                ca_file = ${confdir}/mods-config/rest/trustroot.pem
                check_cert     = "yes"
# doesn't work regardless if check_cert_cn is yes or no
[...]

Then I get an error message during FreeRADIUS' cert validation phase:

rlm_rest (rest): Reserved connection (0)
(15) rest: Expanding URI components
(15) rest: EXPAND https://2fa.restena.lu
(15) rest:    --> https://2fa.restena.lu
(15) rest: EXPAND //validate/radiuscheck
(15) rest:    --> //validate/radiuscheck
(15) rest: Sending HTTP POST to "https://2fa.restena.lu//validate/radiuscheck"
(15) rest: EXPAND user=%{urlquote:%{User-Name}}&pass=%{urlquote:%{TOTP-Token}}
(15) rest:    --> user=swinter&pass=thetokenvalue
(15) rest: ERROR: Request failed: 83 - Issuer check against peer certificate failed
(15) rest: ERROR: Server returned no data
rlm_rest (rest): Released connection (0)

I don't really know what to make of "Issuer check against
peer certificate failed". The root appears to be recognised,
and the intermedaite chain is the expected one. So what
would be failing here?

For reference, the two CA certs are pasted at the end. They
are the root and intermediate, concatenated. If I only place
the root cert itself into the file -> same result.

Greetings,

Stefan Winter

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-- 
Stefan WINTER
Ingenieur de Recherche
Fondation RESTENA - Réseau Téléinformatique de l'Education Nationale et de la Recherche
2, avenue de l'Université
L-4365 Esch-sur-Alzette

Tel: +352 424409 1
Fax: +352 422473

PGP key updated to 4096 Bit RSA - I will encrypt all mails if the recipient's key is known to me

http://pgp.mit.edu:11371/pks/lookup?op=get&search=0xC0DE6A358A39DC66
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