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patrickpr / YAOG

Yet Another Openssl GUI : Qt based openssl GUI to create CSR, certificates, keys (RSA / DSA / EC)
GNU General Public License v3.0
106 stars 11 forks source link

Error when using email to generate cert #7

Closed tezwork closed 4 years ago

tezwork commented 4 years ago

I get a string error when using a email similar to it.alerts@testdomain.org.nz

Error: "Lib : asn1 encoding routines, doing : ASN1_mbstring_ncopy, reason : string too long (13/122/151)"

I can generate without the email which is fine, but frustrating.

patrickpr commented 4 years ago

Hi,

I'll have a look at this. Please give me the following info :

Regards,

patrickpr commented 4 years ago

I managed to reproduce the bug, will be working on soon.

patrickpr commented 4 years ago

Hi,

Looking at the RFC5280 page 123, the common name should be less than 64 caracters ("ub" is for upper bound) : "ub-common-name INTEGER ::= 64"

Common name (CN) is composed of : 1) The certificate name (can be URL but also something else) 2) if an email is provided, then the string "/emailAddress=\<email>" is added to it.

If length of name + email + "/emailAddress=" is more than 64 caracters then it leads to an error.

This seems to be harcoded in OpenSSL and for good reasons as the RFC says : "specifications of Upper Bounds MUST be regarded as mandatory", so any certificate with more than 64 caracters in CN will be invalid.

I suggest you put a short name in the "name (CN)", set the email and add the real URL as a SubjectAltName (click "add" in the X509 extensions box ans choose SubjectAltName ).

/Patrick

patrickpr commented 4 years ago

Feel free to open the case again if you have comments or questions regarding this.