Using the Security command in Terminal does not change trust settings

[bobotech]

I'm trying to write a script that will import a certificate into a user's keychain, and then force it to be trusted. The certificate by default is untrusted since its a self signed cert.

First command for the cert is this:

sudo -u $USERNAME /usr/bin/security import /Users/Shared/OurCert.cer -k /Users/$USERNAME/Library/Keychains/login.keychain

That part works fine, the cert is now in the user's keychain but is untrusted.

Next command is this:

sudo -u $USERNAME /usr/bin/security add-certificates /Users/Shared/OurCert.cer

I assume that this is working, no error is thrown on that line.

The final command for the cert is this:

sudo -u $USERNAME /usr/bin/security add-trusted-cert /Users/Shared/OurCert.cer

If I do the command in terminal, it prompts for the admin username/pass which is fine but when I hit okay, i get no errors and the command prompt but the cert is still untrusted in Keychain app.

What am I missing?