New script to manage ssh_pubkey with Duplicati
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E759BAA22501AF32
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#!/bin/sh
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#
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# Purpose {{{
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# This script will try to allow SSH connection for a user by
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# 1. Getting the username.
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# * Directly from the argument.
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# * Or from an ldap search with a given email address.
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# * Verify that the system knows this user.
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# 2. Adding the pubkey to a specific authorized_keys file.
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# * System wide authorized_keys directory (default to /etc/ssh/authorized_keys).
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# * One authorized_keys file per user.
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# * Adding some restriction to the pubkey (allow only scp by default).
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# …
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#
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# 2022-07-19
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# }}}
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# Vars {{{
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PROGNAME=$(basename "${0}"); readonly PROGNAME
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PROGDIR=$(readlink -m $(dirname "${0}")); readonly PROGDIR
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ARGS="${*}"; readonly ARGS
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readonly NBARGS="${#}"
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[ -z "${DEBUG}" ] && DEBUG=1
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## Export DEBUG for sub-script
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export DEBUG
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## Default values for some vars
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readonly SSH_PUBKEY_FILE_DEFAULT="/tmp/duplicati_id_ed25519.pub"
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readonly SSH_PUBKEY_OPTION_DEFAULT='no-port-forwarding,no-X11-forwarding,no-agent-forwarding,no-pty,command="/usr/lib/openssh/sftp-server"'
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readonly SSHD_AUTH_KEY_DIR_DEFAULT="/home/.duplicati/ssh/authorized_keys"
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## Colors
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readonly PURPLE='\033[1;35m'
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readonly RED='\033[0;31m'
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readonly RESET='\033[0m'
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readonly COLOR_DEBUG="${PURPLE}"
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# }}}
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usage() { # {{{
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cat <<- HELP
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usage: $PROGNAME [-a|-d|-f|-h|-k|-o] -e|-u
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This script will try to add a SSH pubkey to allow user's connection.
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EXAMPLES :
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- Add default pubkey file (${SSH_PUBKEY_FILE_DEFAULT} to default authorized_keys location (${SSHD_AUTH_KEY_DIR_DEFAULT}) for USERNAME
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${PROGNAME} --user USERNAME
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- Add pubkey file to a user from the given email address
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${PROGNAME} --keyfile /tmp/id_ed25519.pub --mail last.name@domain.org
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- Add given pubkey for USERNAME
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${PROGNAME} --key "ssh-ed25519 AAAAC3NzaC1…" --user USERNAME
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- Add pubkey to specific authorized_keys location
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${PROGNAME} --user USERNAME --authorized_keys /etc/ssh/authorized_keys
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- Limit "only" port and X11 forwarding on the public key
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${PROGNAME} --user USERNAME --option "no-port-forwarding,no-X11-forwarding"
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OPTIONS :
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-a,--authorized,--authorized_keys
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Set authorized_keys directory to use.
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Default : "${SSHD_AUTH_KEY_DIR_DEFAULT}
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-d,--debug
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Enable debug messages.
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-h,--help
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Print this help message.
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-e,--email,--mail
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Email address to request username with ldapsearch.
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-f,--file,--keyfile
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Path to a file containing the pubkey to allow.
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Default : ${SSH_PUBKEY_FILE_DEFAULT}
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-k,--key
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Complete pubkey with algorithm and the key.
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If not set, fall back to default ssh pubkey file (${SSH_PUBKEY_FILE_DEFAULT} .
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-o,--option
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Options to add to public key. Default basically allow only scp :
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${SSH_PUBKEY_OPTION_DEFAULT}
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-u,--user,--username
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Username that should have access to the system with the given pubkey.
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If not set, fall back to an LDAP request with email address to guess the username.
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HELP
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}
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# }}}
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debug_message() { # {{{
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local_debug_message="${1}"
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## Print message if DEBUG is enable (=0)
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[ "${DEBUG}" -eq "0" ] && printf "${COLOR_DEBUG}%b${RESET}\n" "DEBUG − ${PROGNAME} : ${local_debug_message}"
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unset local_debug_message
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return 0
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}
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# }}}
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error_message() { # {{{
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local_error_message="${1}"
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local_error_code="${2}"
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## Print message
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printf '%b\n' "ERROR − ${PROGNAME} : ${RED}${local_error_message}${RESET}"
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exit "${local_error_code:=66}"
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}
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# }}}
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define_vars() { # {{{
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## If USER_NAME wasn't defined (argument) {{{
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debug_message "define_vars − \
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Check USER related vars."
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if is_var_empty "${USER_NAME}"; then
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if is_var_defined "${USER_EMAIL}"; then
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## Search with email address on the ldap
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debug_message "define_vars − \
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Use given email address (${RED}${USER_EMAIL}${COLOR_DEBUG}) to request LDAP server for a matching username."
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USER_NAME="$(ldapsearch -x -ZZ -s one "(mail=${USER_EMAIL})" \
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| awk '/^uid: / { print $2 }')"
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readonly USER_NAME
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is_var_defined "${USER_NAME}" \
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|| error_message "Error with username (${USER_NAME}), please verify the given email address (${USER_EMAIL})." 01
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else
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error_message "Expect USERNAME informations (please use --user or --mail option)." 02
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fi
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fi
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debug_message "define_vars − \
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->${RED}${USER_NAME}${COLOR_DEBUG}<- username will be used."
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## }}}
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## If SSHD_AUTH_KEY_DIR wasn't defined (argument) {{{
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debug_message "define_vars − \
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Check authorized_keys related var."
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if is_var_empty "${SSHD_AUTH_KEY_DIR}"; then
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SSHD_AUTH_KEY_DIR="${SSHD_AUTH_KEY_DIR_DEFAULT}"
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readonly SSHD_AUTH_KEY_DIR
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fi
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debug_message "define_vars − \
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->${RED}${SSHD_AUTH_KEY_DIR}${COLOR_DEBUG}<- directory will be used to store public keys."
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## }}}
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## If SSH_PUBKEY wasn't defined (argument) {{{
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debug_message "define_vars − \
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Check SSH_PUBKEY related vars."
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if is_var_empty "${SSH_PUBKEY}"; then
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## Try to get SSH_PUBKEY from SSH_PUBKEY_FILE {{{
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### If SSH_PUBKEY_FILE wasn't defined {{{
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if is_var_empty "${SSH_PUBKEY_FILE}"; then
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### Use default value for SSH_PUBKEY_FILE
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SSH_PUBKEY_FILE="${SSH_PUBKEY_FILE_DEFAULT}"
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readonly SSH_PUBKEY_FILE
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fi
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### }}}
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debug_message "define_vars − \
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->${RED}${SSH_PUBKEY_FILE}${COLOR_DEBUG}<- file will be used to provide user's public key."
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### If SSH_PUBKEY_FILE doesn't exists {{{
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#### AND Exit with error
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is_file_absent "${SSH_PUBKEY_FILE}" \
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&& error_message "Error, public key file (${SSH_PUBKEY_FILE}) doesn't exists (please check --keyfile option)." 03
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### }}}
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SSH_PUBKEY="$(grep --max-count=1 -- "ssh-" "${SSH_PUBKEY_FILE}" \
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|| error_message "Error, can't retrieve ssh pubkey content from pubkey file (${SSH_PUBKEY_FILE}" 04)"
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### }}}
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fi
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# Can't use default debug_message function due to some limitations (size ?)
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if [ "${DEBUG}" -eq "0" ]; then
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printf "${COLOR_DEBUG}%b${RESET}\n" "DEBUG − ${PROGNAME} : define_vars − ->"
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printf "${RED}%b${RESET}\n" "${SSH_PUBKEY}"
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printf "${COLOR_DEBUG}%b${RESET}\n" "<- key will be used as user's public key."
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fi
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## }}}
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## If SSH_PUBKEY_OPTION wasn't defined (argument) {{{
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debug_message "define_vars − \
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Check ssh_pubkey OPTIONS related var."
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if is_var_empty "${SSH_PUBKEY_OPTION}"; then
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### Use default value for SSH_PUBKEY_OPTION
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SSH_PUBKEY_OPTION="${SSH_PUBKEY_OPTION_DEFAULT}"
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readonly SSH_PUBKEY_OPTION
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fi
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debug_message "define_vars − \
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->${RED}${SSH_PUBKEY_OPTION}${COLOR_DEBUG}<- options will be used for public key."
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## }}}
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}
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# }}}
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is_var_defined() { # {{{
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## Test if at least one of the given var(s) is defined
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## Return False by default
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return_var_defined="1"
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## Total number of variables to test
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local_total_var="${#}"
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loop_count_var_defined="0"
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## While it remains a variable to test
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while [ "${local_total_var}" -gt "${loop_count_var_defined}" ]; do
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debug_message "is_var_defined − \
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Test var: ${1}."
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### Test if this is defined and set return value to True
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[ -n "${1}" ] && return_var_defined="0"
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### Increase the number of tested variables
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loop_count_var_defined=$((loop_count_var_defined+1))
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### Shift to the next variable
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shift
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done
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unset local_total_var
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unset loop_count_var_defined
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return "${return_var_defined}"
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}
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# }}}
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is_var_empty() { # {{{
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## Test if at least one of the given var(s) is empty
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## Return False by default
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return_var_empty="1"
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## Total number of variables to test
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local_total_var="${#}"
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loop_count_var_empty="0"
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## While it remains a variable to test
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while [ "${local_total_var}" -gt "${loop_count_var_empty}" ]; do
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debug_message "is_var_empty − \
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Test var: ${1}."
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### Test if this is empty and set return value to True
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[ -z "${1}" ] && return_var_empty="0"
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### Increase the number of tested variables
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loop_count_var_empty=$((loop_count_var_empty+1))
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### Shift to the next variable
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shift
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done
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unset local_total_var
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unset loop_count_var_defined
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return "${return_var_empty}"
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}
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# }}}
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is_directory_absent() { # {{{
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local_directory_absent="${1}"
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## Directory doesn't exists by default
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return_is_directory_absent="0"
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### Check if the directory exists
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# shellcheck disable=SC2086
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if test -d "${local_directory_absent}"; then
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return_is_directory_absent="1"
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debug_message "is_directory_absent − \
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The directory ${RED}${local_directory_absent}${COLOR_DEBUG} exists."
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else
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return_is_directory_absent="0"
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debug_message "is_directory_absent − \
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The directory ${RED}${local_directory_absent}${COLOR_DEBUG} doesn't exist."
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fi
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return "${return_is_directory_absent}"
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}
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# }}}
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is_file_absent() { # {{{
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local_file_absent="${1}"
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## File exists by default
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return_is_file_absent="1"
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### Check if the file exists
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# shellcheck disable=SC2086
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if find ${local_file_absent} > /dev/null 2>&1; then
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return_is_file_absent="1"
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debug_message "is_file_absent − \
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The file ${RED}${local_file_absent}${COLOR_DEBUG} exists."
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else
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return_is_file_absent="0"
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debug_message "is_file_absent − \
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The file ${RED}${local_file_absent}${COLOR_DEBUG} doesn't exist."
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fi
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return "${return_is_file_absent}"
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}
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# }}}
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main() { # {{{
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## Define all vars
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define_vars
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## Check if user exists {{{
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if id -u "${USER_NAME}" >/dev/null 2>&1; then
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debug_message "main − \
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The user ${RED}${USER_NAME}${COLOR_DEBUG} was found on the system."
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else
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### OR Exit with error message
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error_message "According to given informations the user (${USER_NAME}) wasn't found on this system.\nPlease check the value passed to --user or --mail options." 11
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fi
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## }}}
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## Manage authorized_keys file {{{
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USER_AUTHORIZED_KEYS_FILE="${SSHD_AUTH_KEY_DIR}/${USER_NAME}"
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## Ensure authorized_keys directory exists {{{
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if is_directory_absent "${SSHD_AUTH_KEY_DIR}"; then
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debug_message "main − \
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Create authorized_keys directory (${RED}${SSHD_AUTH_KEY_DIR}${COLOR_DEBUG})."
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mkdir --parents -- "${SSHD_AUTH_KEY_DIR}" \
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|| error_message "Error when creating authorized_keys directory (${SSHD_AUTH_KEY_DIR})." 21
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fi
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## }}}
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## Ensure user's authorized_keys file exists {{{
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if is_file_absent "${USER_AUTHORIZED_KEYS_FILE}"; then
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debug_message "main − \
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Create authorized_keys file for ${USER_NAME} (${RED}${USER_AUTHORIZED_KEYS_FILE}${COLOR_DEBUG})."
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touch -- "${USER_AUTHORIZED_KEYS_FILE}" \
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|| error_message "Error when creating ${USER_NAME}'s authorized_keys file (${USER_AUTHORIZED_KEYS_FILE})." 22
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fi
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## }}}
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## }}}
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## If pubkey is already in authorized_keys file {{{
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### AND Ensure it's set with the right options
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### AND Exit the script
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if grep --word-regexp --quiet -- "${SSH_PUBKEY}" "${USER_AUTHORIZED_KEYS_FILE}"; then
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sed -i "s|.*${SSH_PUBKEY}.*|${SSH_PUBKEY_OPTION} ${SSH_PUBKEY}|" "${USER_AUTHORIZED_KEYS_FILE}" \
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|| error_message "Error during SSH_PUBKEY replacement with expected options in authorized_keys file (${USER_AUTHORIZED_KEYS_FILE})." 31
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debug_message "The given pubkey was already present in authorized_keys file (${RED}${USER_AUTHORIZED_KEYS_FILE}${COLOR_DEBUG}) and now have the expected permissions."
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## }}}
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## If pubkey isn't already in authorized_keys file {{{
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### Add it with expected options
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else
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printf "%s" "${SSH_PUBKEY_OPTION} ${SSH_PUBKEY}" >> "${USER_AUTHORIZED_KEYS_FILE}" \
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|| error_message "Error while adding SSH_PUBKEY with expected options in authorized_keys file (${USER_AUTHORIZED_KEYS_FILE})." 32
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debug_message "The given pubkey is now present in authorized_keys file (${RED}${USER_AUTHORIZED_KEYS_FILE}${COLOR_DEBUG}) with expected permissions."
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fi
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## }}}
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## If the key is present, exit with success {{{
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grep --word-regexp --quiet -- "${SSH_PUBKEY_OPTION} ${SSH_PUBKEY}" "${USER_AUTHORIZED_KEYS_FILE}" \
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&& printf "%b" "The given pubkey (${RED}${SSH_PUBKEY_FILE}${RESET}) for ${RED}${USER_NAME}${RESET} user was successfully added to it's authorized_keys file (${RED}${USER_AUTHORIZED_KEYS_FILE}${COLOR_DEBUG})." \
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&& exit 0
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## }}}
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}
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# }}}
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# Manage arguments # {{{
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# This code can't be in a function due to argument management
|
||||||
|
|
||||||
|
if [ ! "${NBARGS}" -eq "0" ]; then
|
||||||
|
|
||||||
|
manage_arg="0"
|
||||||
|
|
||||||
|
## If the first argument is not an option
|
||||||
|
if ! printf -- '%s' "${1}" | grep -q -E -- "^-+";
|
||||||
|
then
|
||||||
|
## Print help message and exit
|
||||||
|
printf '%b\n' "${RED}Invalid option: ${1}${RESET}"
|
||||||
|
printf '%b\n' "---"
|
||||||
|
usage
|
||||||
|
|
||||||
|
exit 1
|
||||||
|
fi
|
||||||
|
|
||||||
|
# Parse all options (start with a "-") one by one
|
||||||
|
while printf -- '%s' "${1}" | grep -q -E -- "^-+"; do
|
||||||
|
|
||||||
|
case "${1}" in
|
||||||
|
-a|--authorized_keys|--authorized ) ## Define SSHD_AUTH_KEY_DIR with given arg
|
||||||
|
## Move to the next argument
|
||||||
|
shift
|
||||||
|
## Define var
|
||||||
|
readonly SSHD_AUTH_KEY_DIR="${1}"
|
||||||
|
;;
|
||||||
|
-d|--debug ) ## debug
|
||||||
|
DEBUG=0
|
||||||
|
;;
|
||||||
|
-h|--help ) ## help
|
||||||
|
usage
|
||||||
|
## Exit after help informations
|
||||||
|
exit 0
|
||||||
|
;;
|
||||||
|
-e|--email|--mail ) ## Define USER_EMAIL with given arg
|
||||||
|
## Move to the next argument
|
||||||
|
shift
|
||||||
|
## Define var
|
||||||
|
readonly USER_EMAIL="${1}"
|
||||||
|
;;
|
||||||
|
-f|--file|--keyfile ) ## Define SSH_PUBKEY_FILE with given arg
|
||||||
|
## Move to the next argument
|
||||||
|
shift
|
||||||
|
## Define var
|
||||||
|
readonly SSH_PUBKEY_FILE="${1}"
|
||||||
|
;;
|
||||||
|
-o|--option|--options ) ## Define SSH_PUBKEY_OPTION with given arg
|
||||||
|
## Move to the next argument
|
||||||
|
shift
|
||||||
|
## Define var
|
||||||
|
readonly SSH_PUBKEY_OPTION="${1}"
|
||||||
|
;;
|
||||||
|
-k|--key ) ## Define SSH_PUBKEY with given arg
|
||||||
|
## Move to the next argument
|
||||||
|
shift
|
||||||
|
## Define var
|
||||||
|
readonly SSH_PUBKEY="${1}"
|
||||||
|
;;
|
||||||
|
-u|--user|--username ) ## Define USER_NAME with given arg
|
||||||
|
## Move to the next argument
|
||||||
|
shift
|
||||||
|
## Define var
|
||||||
|
readonly USER_NAME="${1}"
|
||||||
|
;;
|
||||||
|
* ) ## unknow option
|
||||||
|
printf '%b\n' "${RED}Invalid option: ${1}${RESET}"
|
||||||
|
printf '%b\n' "---"
|
||||||
|
usage
|
||||||
|
exit 1
|
||||||
|
;;
|
||||||
|
esac
|
||||||
|
|
||||||
|
debug_message "Arguments management − \
|
||||||
|
${RED}${1}${COLOR_DEBUG} option managed."
|
||||||
|
|
||||||
|
## Move to the next argument
|
||||||
|
shift
|
||||||
|
manage_arg=$((manage_arg+1))
|
||||||
|
|
||||||
|
done
|
||||||
|
|
||||||
|
debug_message "Arguments management − \
|
||||||
|
${RED}${manage_arg}${COLOR_DEBUG} argument(s) successfully managed."
|
||||||
|
else
|
||||||
|
debug_message "Arguments management − \
|
||||||
|
No arguments/options to manage."
|
||||||
|
fi
|
||||||
|
|
||||||
|
# }}}
|
||||||
|
|
||||||
|
# Call main
|
||||||
|
main
|
||||||
|
|
||||||
|
# The script should never reach this line
|
||||||
|
error_message "Unexpected end of the script, please use '--debug' option to have more informations" 255
|
||||||
Loading…
Reference in New Issue