Parsing Strings ( .crt files )
- by user1661521
Base Knowledge : I have a .crt file ( certification authoritie file ) and he is composed of many fields but in one line that resumes this question i have this :
Certificate:
...(alot of stuff before)...
Subject: C=US, ST=Maryland, L=Pasadena, O=Brent Baccala,
OU=FreeSoft, CN=www.freesoft.org/[email protected]
Subject Public Key Info:
...(alot of stuff after)
and i need to parse the file to populate a .csv file and i have that done the problem that i need help is, i need to get the field:
CN=www.fresoft.org
but when i get this kind of CN=...(Value instead of the ...) with alot of slashes i get a error in the parsing like the raw string is:
CN=foo/bar/the/hell/emailAddress=blablabla
and i need only:
foo/bar/the/hell
and for a moment i got that in the correct column but when i dont have the emailAddress something just fail in my parsing and i then get in my CN .csv column the information wrong instead of
|CN|
foo/bar/the/hell
i get:
|CN|
OU=FreeSoft, foo/bar/the/hell.
I have this code doing the CN parsing:
#!/bin/bash
subject_line=$(echo $cert | grep -o "Subject:.*Subject Public Key Info")
cn=$(echo $subject_line | grep -o "CN=.*" )
if [ $(echo $cn | grep -c ".*email.*") -gt 0 ]; then
end_cn=$(echo $cn | grep -b -o emailAddress)
end_cn_idx=$(echo $end_cn | grep -o .*:)
final_end_cn=${end_cn_idx:0:-1}
common_name=${cn:3:$final_end_cn-4}
echo $common_name
else
end_cn=$(echo $cn | grep -b -o "Subject Public Key Info")
end_cn_idx=$(echo $end_cn | grep -o .*:)
final_end_cn=${end_cn_idx:0:-1}
common_name=${cn:3:$final_end_cn-5}
echo $common_name
fi
