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path: root/scripts/pacman-key.sh.in
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#!/bin/bash
#
#   pacman-key - manages pacman's keyring
#                Based on apt-key, from Debian
#   @configure_input@
#
#   Copyright (c) 2010-2011 Pacman Development Team <pacman-dev@archlinux.org>
#
#   This program is free software; you can redistribute it and/or modify
#   it under the terms of the GNU General Public License as published by
#   the Free Software Foundation; either version 2 of the License, or
#   (at your option) any later version.
#
#   This program is distributed in the hope that it will be useful,
#   but WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#   GNU General Public License for more details.
#
#   You should have received a copy of the GNU General Public License
#   along with this program.  If not, see <http://www.gnu.org/licenses/>.
#

# gettext initialization
export TEXTDOMAIN='pacman-scripts'
export TEXTDOMAINDIR='@localedir@'

myver="@PACKAGE_VERSION@"

# Options
ADD=0
DELETE=0
EDITKEY=0
EXPORT=0
FINGER=0
IMPORT=0
IMPORT_TRUSTDB=0
INIT=0
KEYSERVER=''
LISTKEYS=0
LISTSIGS=0
LSIGNKEY=0
POPULATE=0
RECEIVE=0
REFRESH=0
UPDATEDB=0
VERIFY=0

DEFAULT_KEYSERVER='hkp://keys.gnupg.net'

m4_include(library/output_format.sh)

m4_include(library/parse_options.sh)

usage() {
  printf "pacman-key (pacman) %s\n" ${myver}
  echo
  printf "$(gettext "Usage: %s [options]")\n" $(basename $0)
  echo
  printf "$(gettext "Manage pacman's list of trusted keys")\n"
  echo
  echo "$(gettext "Options:")"
  echo "$(gettext "  -a, --add [file(s)]       Add the specified keys (empty for stdin)")"
  echo "$(gettext "  -d, --delete <keyid(s)>   Remove the specified keyids")"
  echo "$(gettext "  -e, --export [keyid(s)]   Export the specified or all keyids")"
  echo "$(gettext "  -f, --finger [keyid(s)]   List fingerprint for specified or all keyids")"
  echo "$(gettext "  -h, --help                Show this help message and exit")"
  echo "$(gettext "  -l, --list-keys [keyid(s)] List the specified or all keys")"
  echo "$(gettext "  -r, --recv-keys <keyid(s)> Fetch the specified keyids")"
  echo "$(gettext "  -u, --updatedb            Update the trustdb of pacman")"
  echo "$(gettext "  -v, --verify <signature>  Verify the file specified by the signature")"
  echo "$(gettext "  -V, --version             Show program version")"
  printf "$(gettext "  --config <file>           Use an alternate config file (instead of\n\
                            '%s')")\n" "@sysconfdir@/pacman.conf"
  echo "$(gettext "  --edit-key <keyid(s)>     Present a menu for key management task on keyids")"
  printf "$(gettext "  --gpgdir <dir>            Set an alternate directory for GnuPG (instead\n\
                            of '%s')")\n" "@sysconfdir@/pacman.d/gnupg"
  echo "$(gettext "  --import <dir(s)>         Imports pubring.gpg from dir(s)")"
  echo "$(gettext "  --import-trustdb <dir(s)> Imports ownertrust values from trustdb.gpg in dir(s)")"
  echo "$(gettext "  --init                    Ensure the keyring is properly initialized")"
  echo "$(gettext "  --keyserver               Specify a keyserver to use if necessary")"
  echo "$(gettext "  --list-sigs [keyid(s)]    List keys and their signatures")"
  echo "$(gettext "  --lsign-key <keyid>       Locally sign the specified keyid")"
  printf "$(gettext "  --populate [keyring(s)]   Reload the default keys from the (given) keyrings\n\
                            in '%s'")\n" "@pkgdatadir@/keyrings"
  echo "$(gettext "  --refresh-keys [keyid(s)] Update specified or all keys from a keyserver")"
}

version() {
  printf "pacman-key (pacman) %s\n" "${myver}"
  printf "$(gettext "\
Copyright (c) 2010-2011 Pacman Development Team <pacman-dev@archlinux.org>.\n\
This is free software; see the source for copying conditions.\n\
There is NO WARRANTY, to the extent permitted by law.\n")"
}

# read the config file "$1" which has key=value pairs, and return the key which
# matches "$2". the equals sign between pairs may be surrounded by any amount
# of whitespace. Optionally, "$3" can be specified which is the default value
# when no key is found.
get_from() {
  while IFS='=' read -r key value; do
    [[ -z $key || ${key:0:1} = '#' ]] && continue

    if [[ ${key%% *} = "$2" && -n ${value##* } ]]; then
      echo "${value##* }"
      return 0
    fi
  done < "$1"
  if [[ -n "$3" ]]; then
    printf '%s\n' "$3"
    return 0
  fi
  return 1
}

generate_master_key() {
  # Generate the master key, which will be in both pubring and secring
  "${GPG_PACMAN[@]}" --gen-key --batch <<EOF
%echo Generating pacman keychain master key...
Key-Type: RSA
Key-Length: 2048
Key-Usage: sign
Name-Real: Pacman Keychain Master Key
Name-Email: pacman@localhost
Expire-Date: 0
%commit
%echo Done
EOF
}

secret_keys_available() {
  "${GPG_PACMAN[@]}" -K --with-colons | wc -l
}

# Adds the given gpg.conf option if it is not present in the file.
# Note that if we find it commented out, we won't add the option.
# args: $1 conffile, $2 option-name, $3 (optional) option-value
add_gpg_conf_option() {
  local conffile=$1; shift
  # looking for the option 'bare', only leading spaces or # chars allowed,
  # followed by at least one space and any other text or the end of line.
  if ! grep -q "^[[:space:]#]*$1\([[:space:]].*\)*$" "$conffile" &>/dev/null; then
    printf '%s\n' "$*" >> "$conffile"
  fi
}

initialize() {
  local conffile keyserv
  # Check for simple existence rather than for a directory as someone
  # may want to use a symlink here
  [[ -e ${PACMAN_KEYRING_DIR} ]] || mkdir -p -m 755 "${PACMAN_KEYRING_DIR}"

  # keyring files
  [[ -f ${PACMAN_KEYRING_DIR}/pubring.gpg ]] || touch ${PACMAN_KEYRING_DIR}/pubring.gpg
  [[ -f ${PACMAN_KEYRING_DIR}/secring.gpg ]] || touch ${PACMAN_KEYRING_DIR}/secring.gpg
  [[ -f ${PACMAN_KEYRING_DIR}/trustdb.gpg ]] || "${GPG_PACMAN[@]}" --update-trustdb
  chmod 644 ${PACMAN_KEYRING_DIR}/{pubring,trustdb}.gpg
  chmod 600 ${PACMAN_KEYRING_DIR}/secring.gpg

  # gpg.conf
  conffile="${PACMAN_KEYRING_DIR}/gpg.conf"
  [[ -f $conffile ]] || touch "$conffile"
  chmod 644 "$conffile"
  add_gpg_conf_option "$conffile" 'no-greeting'
  add_gpg_conf_option "$conffile" 'no-permission-warning'
  add_gpg_conf_option "$conffile" 'lock-never'
  keyserv=${KEYSERVER:-$DEFAULT_KEYSERVER}
  add_gpg_conf_option "$conffile" 'keyserver' "$keyserv"
  add_gpg_conf_option "$conffile" 'keyserver-options' 'timeout=10'

  # set up a private signing key (if none available)
  if [[ $(secret_keys_available) -lt 1 ]]; then
    generate_master_key
    UPDATEDB=1
  fi
}

check_keyring() {
  if [[ ! -r ${PACMAN_KEYRING_DIR}/pubring.gpg || \
      ! -r ${PACMAN_KEYRING_DIR}/trustdb.gpg ]]; then
    error "$(gettext "You do not have sufficient permissions to read the %s keyring.")" "pacman"
    msg "$(gettext "Use '%s' to correct the keyring permissions.")" "pacman-key --init"
    exit 1
  fi

  if (( (EXPORT || FINGER || LIST || VERIFY) && EUID != 0 )); then
    if ! grep -q "^[[:space:]]*lock-never[[:space:]]*$" ${PACMAN_KEYRING_DIR}/gpg.conf &>/dev/null; then
      error "$(gettext "You do not have sufficient permissions to run this command.")"
      msg "$(gettext "Use '%s' to correct the keyring permissions.")" "pacman-key --init"
      exit 1
    fi
  fi

  if (( LSIGNKEY )); then
    if [[ $(secret_keys_available) -lt 1 ]]; then
      error "$(gettext "There is no secret key available to sign with.")"
      msg "$(gettext "Use '%s' to generate a default secret key.")" "pacman-key --init"
      exit 1
    fi
  fi
}

validate_with_gpg() {
  msg2 "$(gettext "Verifying %s...")" "$1"
  if [[ ! -f "$1.sig" ]]; then
    error "$(gettext "File %s is unsigned, cannot continue.")" "$1"
    return 1
  elif ! "${GPG_PACMAN[@]}" --verify "$1.sig"; then
    error "$(gettext "The signature of file %s is not valid.")" "$1"
    return 1
  fi
  return 0
}

verify_keyring_input() {
  local ret=0;
  local KEYRING_IMPORT_DIR='@pkgdatadir@/keyrings'

  # Verify signatures of keyring files and trusted/revoked files if they exist
  msg "$(gettext "Verifying keyring file signatures...")"
  local keyring keyfile
  for keyring in "${KEYRINGIDS[@]}"; do
    keyfile="${KEYRING_IMPORT_DIR}/${keyring}.gpg"
    validate_with_gpg "${keyfile}" || ret=1

    keyfile="${KEYRING_IMPORT_DIR}/${keyring}-trusted"
    if [[ -f "${keyfile}" ]]; then
      validate_with_gpg "${keyfile}" || ret=1
    fi

    keyfile="${KEYRING_IMPORT_DIR}/${keyring}-revoked"
    if [[ -f "${keyfile}" ]]; then
      validate_with_gpg "${keyfile}" || ret=1
    fi
  done

  return $ret
}

populate_keyring() {
  local KEYRING_IMPORT_DIR='@pkgdatadir@/keyrings'

  local keyring
  local ret=0
  if [[ -z ${KEYRINGIDS[@]} ]]; then
    # get list of all available keyrings
    shopt -s nullglob
    KEYRINGIDS=("$KEYRING_IMPORT_DIR"/*.gpg)
    shopt -u nullglob
    KEYRINGIDS=("${KEYRINGIDS[@]##*/}")
    KEYRINGIDS=("${KEYRINGIDS[@]%.gpg}")
    if [[ -z ${KEYRINGIDS[@]} ]]; then
      error "$(gettext "No keyring files exist in %s.")" "$KEYRING_IMPORT_DIR"
      ret=1
    fi
  else
    # verify listed keyrings exist
    for keyring in "${KEYRINGIDS[@]}"; do
      if [[ ! -f "$KEYRING_IMPORT_DIR/$keyring.gpg" ]]; then
        error "$(gettext "The keyring file %s does not exist.")" "$KEYRING_IMPORT_DIR/$keyring.gpg"
        ret=1
      fi
    done
  fi

  if (( ret )); then
    exit 1
  fi

  verify_keyring_input || exit 1

  # Variable used for iterating on keyrings
  local key
  local key_id

  # Add keys from requested keyrings
  for keyring in "${KEYRINGIDS[@]}"; do
    msg "$(gettext "Appending keys from %s.gpg...")" "$keyring"
    "${GPG_PACMAN[@]}" --import "${KEYRING_IMPORT_DIR}/${keyring}.gpg"
  done

  # Read the trusted key IDs to an array. Because this is an ownertrust
  # file, we know we have the full 40 hex digit fingerprint values.
  # Format of ownertrust dump file:
  #  40CHARFINGERPRINTXXXXXXXXXXXXXXXXXXXXXXX:6:
  #  40CHARFINGERPRINTXXXXXXXXXXXXXXXXXXXXXXX:5:
  local -A trusted_ids
  for keyring in "${KEYRINGIDS[@]}"; do
    if [[ -f "${KEYRING_IMPORT_DIR}/${keyring}-trusted" ]]; then
      while read key; do
        # skip comments; these are valid in this file
        [[ $key = \#* ]] && continue
        key_id="${key%%:*}"
        if [[ -n ${key_id} ]]; then
          # Mark this key to be lsigned
          trusted_ids[$key_id]="${keyring}"
        fi
      done < "${KEYRING_IMPORT_DIR}/${keyring}-trusted"
    fi
  done

  if (( ${#trusted_ids[@]} > 0 )); then
    msg "$(gettext "Locally signing trusted keys in keyring...")"
    for key_id in "${!trusted_ids[@]}"; do
      msg2 "$(gettext "Locally signing key %s...")" "${key_id}"
      "${GPG_PACMAN[@]}" --quiet --lsign-key "${key_id}"
    done
    msg "$(gettext "Importing owner trust values...")"
    for keyring in "${KEYRINGIDS[@]}"; do
      if [[ -f "${KEYRING_IMPORT_DIR}/${keyring}-trusted" ]]; then
        "${GPG_PACMAN[@]}" --import-ownertrust "${KEYRING_IMPORT_DIR}/${keyring}-trusted"
      fi
    done
  fi

  # Read the revoked key IDs to an array. The conversion from whatever is
  # inside the file to key ids is important, because key ids are the only
  # guarantee of identification for the keys.
  local -A revoked_ids
  for keyring in "${KEYRINGIDS[@]}"; do
    if [[ -f "${KEYRING_IMPORT_DIR}/${keyring}-revoked" ]]; then
      while read key; do
        key_id="$("${GPG_PACMAN[@]}" --quiet --with-colons --list-key "${key}" 2>/dev/null | grep ^pub | cut -d: -f5)"
        if [[ -n ${key_id} ]]; then
          # Mark this key to be disabled
          revoked_ids[$key_id]="${keyring}"
        fi
      done < "${KEYRING_IMPORT_DIR}/${keyring}-revoked"
    fi
  done

  if (( ${#revoked_ids[@]} > 0 )); then
    msg "$(gettext "Disabling revoked keys in keyring...")"
    for key_id in "${!revoked_ids[@]}"; do
      msg2 "$(gettext "Disabling key %s...")" "${key_id}"
      printf 'disable\nquit\n' | LANG=C "${GPG_PACMAN[@]}" --command-fd 0 --quiet --batch --edit-key "${key_id}" 2>/dev/null
    done
  fi
}

edit_keys() {
  local errors=0;
  for key in "${KEYIDS[@]}"; do
    # Verify if the key exists in pacman's keyring
    if ! "${GPG_PACMAN[@]}" --list-keys "$key" &>/dev/null; then
      error "$(gettext "The key identified by %s does not exist.")" "$key"
      errors=1;
    fi
  done
  (( errors )) && exit 1;

  for key in "${KEYIDS[@]}"; do
    "${GPG_PACMAN[@]}" --edit-key "$key"
  done
}

import_trustdb() {
  local importdir

  for importdir in "${IMPORT_DIRS[@]}"; do
    if [[ -f "${importdir}/trustdb.gpg" ]]; then
      gpg --homedir "${importdir}" --export-ownertrust | \
        "${GPG_PACMAN[@]}" --import-ownertrust -
    fi
  done
}

import() {
  local importdir

  for importdir in "${IMPORT_DIRS[@]}"; do
    if [[ -f "${importdir}/pubring.gpg" ]]; then
      "${GPG_PACMAN[@]}" --quiet --batch --import "${importdir}/pubring.gpg"
    fi
  done
}

# PROGRAM START
if ! type gettext &>/dev/null; then
  gettext() {
    echo "$@"
  }
fi

OPT_SHORT="a::d:e:f::hl::r:uv:V"
OPT_LONG="add::,config:,delete:,edit-key:,export::,finger::,gpgdir:"
OPT_LONG+=",help,import:,import-trustdb:,init,keyserver:,list-keys::,list-sigs::"
OPT_LONG+=",lsign-key:,populate::,recv-keys:,refresh-keys::,updatedb"
OPT_LONG+=",verify:,version"
if ! OPT_TEMP="$(parse_options $OPT_SHORT $OPT_LONG "$@")"; then
  echo; usage; exit 1 # E_INVALID_OPTION;
fi
eval set -- "$OPT_TEMP"
unset OPT_SHORT OPT_LONG OPT_TEMP

if [[ $1 == "--" ]]; then
  usage;
  exit 0;
fi

while true; do
  case "$1" in
    -a|--add)         ADD=1; [[ -n $2 && ${2:0:1} != "-" ]] && shift && KEYFILES=($1); UPDATEDB=1 ;;
    --config)         shift; CONFIG=$1 ;;
    -d|--delete)      DELETE=1; shift; KEYIDS=($1); UPDATEDB=1 ;;
    --edit-key)       EDITKEY=1; shift; KEYIDS=($1); UPDATEDB=1 ;;
    -e|--export)      EXPORT=1; [[ -n $2 && ${2:0:1} != "-" ]] && shift && KEYIDS=($1) ;;
    -f|--finger)      FINGER=1; [[ -n $2 && ${2:0:1} != "-" ]] && shift && KEYIDS=($1) ;;
    --gpgdir)         shift; PACMAN_KEYRING_DIR=$1 ;;
    --import)         IMPORT=1; shift; IMPORT_DIRS=($1); UPDATEDB=1 ;;
    --import-trustdb) IMPORT_TRUSTDB=1; shift; IMPORT_DIRS=($1); UPDATEDB=1 ;;
    --init)           INIT=1 ;;
    --keyserver)      shift; KEYSERVER=$1 ;;
    -l|--list-keys)   LISTKEYS=1; [[ -n $2 && ${2:0:1} != "-" ]] && shift && KEYIDS=($1) ;;
    --list-sigs)      LISTSIGS=1; [[ -n $2 && ${2:0:1} != "-" ]] && shift && KEYIDS=($1) ;;
    --lsign-key)      LSIGNKEY=1; shift; KEYIDS=($1); UPDATEDB=1 ;;
    --populate)       POPULATE=1; [[ -n $2 && ${2:0:1} != "-" ]] && shift && KEYRINGIDS=($1); UPDATEDB=1 ;;
    -r|--recv-keys)   RECEIVE=1; shift; KEYIDS=($1); UPDATEDB=1 ;;
    --refresh-keys)   REFRESH=1; [[ -n $2 && ${2:0:1} != "-" ]] && shift && KEYIDS=($1) ;;
    -u|--updatedb)    UPDATEDB=1 ;;
    -v|--verify)      VERIFY=1; shift; SIGNATURE=$1 ;;

    -h|--help)        usage; exit 0 ;;
    -V|--version)     version; exit 0 ;;

    --)               OPT_IND=0; shift; break;;
    *)                usage; exit 1 ;;
  esac
  shift
done


if ! type -p gpg >/dev/null; then
    error "$(gettext "Cannot find the %s binary required for all %s operations.")" "gpg" "pacman-key"
  exit 1
fi

if (( (ADD || DELETE || EDITKEY || IMPORT || IMPORT_TRUSTDB || INIT || LSIGNKEY || POPULATE || RECEIVE || REFRESH || UPDATEDB) && EUID != 0 )); then
  error "$(gettext "%s needs to be run as root for this operation.")" "pacman-key"
  exit 1
fi

CONFIG=${CONFIG:-@sysconfdir@/pacman.conf}
if [[ ! -r "${CONFIG}" ]]; then
  error "$(gettext "%s configuration file '%s' not found.")" "pacman" "$CONFIG"
  exit 1
fi

# if PACMAN_KEYRING_DIR isn't assigned, try to get it from the config
# file, falling back on a hard default
PACMAN_KEYRING_DIR=${PACMAN_KEYRING_DIR:-$(get_from "$CONFIG" "GPGDir" "@sysconfdir@/pacman.d/gnupg")}

GPG_PACMAN=(gpg --homedir "${PACMAN_KEYRING_DIR}" --no-permission-warning)
if [[ -n ${KEYSERVER} ]]; then
  GPG_PACMAN+=(--keyserver "${KEYSERVER}")
fi

# check only a single operation has been given
# don't include UPDATEDB in here as other opts can induce it
numopt=$(( ADD + DELETE + EDITKEY + EXPORT + FINGER + IMPORT + IMPORT_TRUSTDB +
    INIT + LISTKEYS + LISTSIGS + LSIGNKEY + POPULATE + RECEIVE + REFRESH + VERIFY ))

case $numopt in
  0)
    if (( ! UPDATEDB )); then
      error "$(gettext "no operation specified (use -h for help)")"
      exit 1
    fi
    ;;
  [!1])
    error "$(gettext "Multiple operations specified.")"
    msg "$(gettext "Please run %s with each operation separately.")" "pacman-key"
    exit 1
    ;;
esac

(( ! INIT )) && check_keyring

(( ADD )) && "${GPG_PACMAN[@]}" --quiet --batch --import "${KEYFILES[@]}"
(( DELETE )) && "${GPG_PACMAN[@]}" --quiet --batch --delete-key --yes "${KEYIDS[@]}"
(( EDITKEY )) && edit_keys
(( EXPORT )) && "${GPG_PACMAN[@]}" --armor --export "${KEYIDS[@]}"
(( FINGER )) && "${GPG_PACMAN[@]}" --batch --fingerprint "${KEYIDS[@]}"
(( IMPORT )) && import
(( IMPORT_TRUSTDB)) && import_trustdb
(( INIT )) && initialize
(( LISTKEYS )) && "${GPG_PACMAN[@]}" --batch --list-keys "${KEYIDS[@]}"
(( LISTSIGS )) && "${GPG_PACMAN[@]}" --batch --list-sigs "${KEYIDS[@]}"
if (( LSIGNKEY )); then
  printf 'y\ny\n' | LANG=C "${GPG_PACMAN[@]}" --command-fd 0 --quiet --batch --lsign-key "${KEYIDS[@]}" 2>/dev/null
fi
(( POPULATE )) && populate_keyring
(( RECEIVE )) && "${GPG_PACMAN[@]}" --recv-keys "${KEYIDS[@]}"
(( REFRESH )) && "${GPG_PACMAN[@]}" --refresh-keys "${KEYIDS[@]}"
(( VERIFY )) && "${GPG_PACMAN[@]}" --verify "$SIGNATURE"

if (( UPDATEDB )); then
  msg "$(gettext "Updating trust database...")"
  "${GPG_PACMAN[@]}" --batch --check-trustdb
fi

# vim: set ts=2 sw=2 noet: