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|
#!/bin/bash
#------------
# SSH-AGENT
#------------
function sshagent_start {
local key_path="$HOME/.ssh/id_ed25519"
local lifetime="5d"
# Parse options
while getopts "t:k:" opt; do
case "$opt" in
t) lifetime="$OPTARG" ;;
k) key_path="$OPTARG" ;;
*)
echo "Usage: sagent_start [-t lifetime] [-k key_path]"
return 1
;;
esac
done
# Convert lifetime to seconds
local num=${lifetime//[!0-9]/}
local unit=${lifetime//[0-9]/}
local seconds=0
case "$unit" in
s|"") seconds=$num ;; # default to seconds
m) seconds=$((num * 60)) ;;
h) seconds=$((num * 3600)) ;;
d) seconds=$((num * 86400)) ;;
*)
echo "Invalid time unit. Use s, m, h, or d."
return 1
;;
esac
# Clean previous ssh credentials
(rm -rf /tmp/ssh-* > /dev/null)
SSH_ENV="$HOME/.ssh/environment"
printf '\e[1;36m%s\e[m\n' "Initialising new SSH agent..."
ssh-agent | sed 's/^echo/#echo/' > "${SSH_ENV}"
chmod 600 "${SSH_ENV}"
# shellcheck source=/dev/null
source "${SSH_ENV}" > /dev/null
if [[ ! -f "$key_path" ]]; then
printf '\e[1;31m%s\e[m\n' "SSH key not found at $key_path"
return 1
fi
if ssh-add -t "$seconds" "$key_path" >/dev/null 2>&1 ; then
printf '\e[1;36m%s\e[m\n' "SSH key added successfully: $key_path (lifetime: $lifetime = ${seconds}s)"
else
printf '\e[1;31m%s\e[m\n' "Failed to add SSH key"
fi
}
function sshagent_stop {
# clean previous ssh credentials
(rm -rf /tmp/ssh-* > /dev/null)
ssh-agent -k > /dev/null
}
function sshagent_findsockets {
find /tmp -uid "$(id -u)" -type s -name agent.\* 2>/dev/null
}
function sshagent_testsocket {
if [ ! -x "$(command -v ssh-add)" ] ; then
echo "ssh-add is not available; agent testing aborted"
return 1
fi
if [ X"$1" != X ] ; then
export SSH_AUTH_SOCK=$1
fi
if [ X"$SSH_AUTH_SOCK" = X ] ; then
return 2
fi
if [ -S "$SSH_AUTH_SOCK" ] ; then
ssh-add -l > /dev/null
if [ $? = 2 ] ; then
echo "Socket $SSH_AUTH_SOCK is dead! Deleting!"
rm -f "$SSH_AUTH_SOCK"
return 4
else
echo "Found ssh-agent $SSH_AUTH_SOCK"
return 0
fi
else
echo "$SSH_AUTH_SOCK is not a socket!"
return 3
fi
}
function sshagent_reload {
# ssh agent sockets can be attached to a ssh daemon process or an
# ssh-agent process.
AGENTFOUND=0
# Attempt to find and use the ssh-agent in the current environment
if sshagent_testsocket ; then AGENTFOUND=1 ; fi
# If there is no agent in the environment, search /tmp for
# possible agents to reuse before starting a fresh ssh-agent
# process.
if [ $AGENTFOUND = 0 ] ; then
for agentsocket in $(sshagent_findsockets) ; do
if [ $AGENTFOUND != 0 ] ; then break ; fi
if sshagent_testsocket "$agentsocket" ; then AGENTFOUND=1 ; fi
done
fi
# If at this point we still haven't located an agent, it's time to
# start a new one
if [ $AGENTFOUND = 0 ] ; then
eval "$(ssh-agent)"
fi
# Clean up
unset AGENTFOUND
unset agentsocket
# Finally, show what keys are currently in the agent
ssh-add -l
}
if [[ -f "$HOME/.ssh/environment" ]]; then
sshagent_reload > /dev/null 2>&1
fi
# Alias agents
alias sagent_start="sshagent_start"
alias sagent_stop="sshagent_stop"
# Clean up not global functions
unset -f sshagent_findsockets sshagent_testsocket
|
