You can configure one or more checksum hashes that can be used
to verify the integrity of an SNMP script before the script runs on
the switch, router, or security device.
To configure a checksum hash:
- Create the script.
- Place the script in the /var/db/scripts/snmp directory on the device.
- Run the script through one or more hash functions to calculate
hash values.
Starting in Junos OS
Release 18.2R2 and 18.3R1, Junos OS supports only the SHA-256 hash
function for configuring script checksum hashes. Earlier releases support the MD5, SHA-1, and SHA-256 hash functions.
user@host> file checksum md5 /var/db/scripts/snmp/script1.slax
MD5 (/var/db/scripts/snmp/script1.slax) = 3af7884eb56e2d4489c2e49b26a39a97
user@host> file checksum sha1 /var/db/scripts/snmp/script1.slax
SHA1 (/var/db/scripts/snmp/script1.slax) = 00dc690fb08fb049577d012486c9a6dad34212c0
user@host> file checksum sha-256 /var/db/scripts/snmp/script1.slax
SHA256 (/var/db/scripts/snmp/script1.slax) = 150bf53383769f3bfedd41fe73320777f208d4fda81230cb27b8738
- Configure the script and the
checksum statement for one or more hash values.[edit system scripts snmp]
user@host# set file script1.slax checksum md5 3af7884eb56e2d4489c2e49b26a39a97
[edit system scripts snmp]
user@host# set file script1.slax checksum sha-1 00dc690fb08fb049577d012486c9a6dad34212c0
[edit system scripts snmp]
user@host# set file script1.slax checksum sha-256 150bf53383769f3bfedd41fe73320777f208d4fda81230cb27b8738
During the execution of the script, Junos OS recalculates the
checksum value using the configured hash algorithm and verifies that
the calculated value matches the configured value. If the values differ,
the execution of the script fails. When you configure multiple checksum
values with different hash algorithms, all the configured values must
match the calculated values; otherwise, the script execution fails.
Change History Table
Feature support is determined by the platform and release you are using. Use Feature Explorer to determine if a feature is supported on your platform.
18.3R1
Starting in Junos OS
Release 18.2R2 and 18.3R1, Junos OS supports only the SHA-256 hash
function for configuring script checksum hashes.
