/etc/ipsec.secrets is in strongswan-starter 5.2.1-6+deb8u6.
This file is owned by root:root, with mode 0o600.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | # This file holds shared secrets or RSA private keys for authentication.
# RSA private key for this host, authenticating it to any other host
# which knows the public part.
# this file is managed with debconf and will contain the automatically created private key
include /var/lib/strongswan/ipsec.secrets.inc
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