src/share/ma/update_users

   1 # -*-shell-script-*-
   2 # This should be sourced by bash (though we welcome changes to make it POSIX sh compliant)
   3
   4 # Monkeysphere authentication update-users subcommand
   5 #
   6 # The monkeysphere scripts are written by:
   7 # Jameson Rollins <jrollins@finestructure.net>
   8 # Jamie McClelland <jm@mayfirst.org>
   9 # Daniel Kahn Gillmor <dkg@fifthhorseman.net>
  10 #
  11 # They are Copyright 2008-2009, and are all released under the GPL,
  12 # version 3 or later.
  13
  14 update_users() {
  15
  16 local returnCode=0
  17 local unames
  18 local uname
  19 local authorizedKeysDir
  20 local authorizedUserIDs
  21
  22 if [ "$1" ] ; then
  23     # get users from command line
  24     unames="$@"
  25 else
  26     # or just look at all users if none specified
  27     unames=$(list_users)
  28 fi
  29
  30 # set mode
  31 MODE="authorized_keys"
  32
  33 # set gnupg home
  34 GNUPGHOME="$GNUPGHOME_SPHERE"
  35
  36 # the authorized_keys directory
  37 authorizedKeysDir="${SYSDATADIR}/authorized_keys"
  38
  39 # check to see if the gpg trust database has been initialized
  40 if [ ! -s "${GNUPGHOME}/trustdb.gpg" ] ; then
  41     failure "GNUPG trust database uninitialized.  Please see MONKEYSPHERE-SERVER(8)."
  42 fi
  43
  44 # make sure the authorized_keys directory exists
  45 mkdir -p "${authorizedKeysDir}"
  46
  47 # loop over users
  48 for uname in $unames ; do
  49     # check all specified users exist
  50     if ! id "$uname" >/dev/null ; then
  51         log error "----- unknown user '$uname' -----"
  52         continue
  53     fi
  54
  55     log verbose "----- user: $uname -----"
  56
  57     # make temporary directory
  58     TMPLOC=$(mktemp -d ${MATMPDIR}/tmp.XXXXXXXXXX) || failure "Could not create temporary directory!"
  59
  60     # trap to delete temporary directory on exit
  61     trap "rm -rf $TMPLOC" EXIT
  62
  63     # create temporary authorized_user_ids file
  64     TMP_AUTHORIZED_USER_IDS="${TMPLOC}/authorized_user_ids"
  65     touch "$TMP_AUTHORIZED_USER_IDS"
  66
  67      # create temporary authorized_keys file
  68     AUTHORIZED_KEYS="${TMPLOC}/authorized_keys"
  69     touch "$AUTHORIZED_KEYS"
  70
  71     # set restrictive permissions on the temporary files
  72     # FIXME: is there a better way to do this?
  73     chmod 0700 "$TMPLOC"
  74     chmod 0600 "$AUTHORIZED_KEYS"
  75     chmod 0600 "$TMP_AUTHORIZED_USER_IDS"
  76     chown -R "$MONKEYSPHERE_USER" "$TMPLOC"
  77
  78     # process authorized_user_ids file
  79     log debug "checking for authorized_user_ids..."
  80     # translating ssh-style path variables
  81     authorizedUserIDs=$(translate_ssh_variables "$uname" "$AUTHORIZED_USER_IDS")
  82     if [ -s "$authorizedUserIDs" ] ; then
  83         log debug "authorized_user_ids file found."
  84         # check permissions on the authorized_user_ids file path
  85         if check_key_file_permissions "$uname" "$authorizedUserIDs" ; then
  86             # copy user authorized_user_ids file to temporary
  87             # location
  88             cat "$authorizedUserIDs" > "$TMP_AUTHORIZED_USER_IDS"
  89
  90             # export needed variables
  91             export AUTHORIZED_KEYS
  92             export TMP_AUTHORIZED_USER_IDS
  93
  94             # process authorized_user_ids file, as monkeysphere user
  95             su_monkeysphere_user \
  96                 ". ${SYSSHAREDIR}/common; STRICT_MODES='$STRICT_MODES' process_authorized_user_ids $TMP_AUTHORIZED_USER_IDS" \
  97                 || returnCode="$?"
  98         else
  99             log debug "not processing authorized_user_ids."
 100         fi
 101     else
 102         log debug "empty or absent authorized_user_ids file."
 103     fi
 104
 105     # add user-controlled authorized_keys file if specified translate
 106     # ssh-style path variables
 107     rawAuthorizedKeys=$(translate_ssh_variables "$uname" "$RAW_AUTHORIZED_KEYS")
 108     if [ "$rawAuthorizedKeys" != 'none' ] ; then
 109         log debug "checking for raw authorized_keys..."
 110         if [ -s "$rawAuthorizedKeys" ] ; then
 111             # check permissions on the authorized_keys file path
 112             if check_key_file_permissions "$uname" "$rawAuthorizedKeys" ; then
 113                 log verbose "adding raw authorized_keys file... "
 114                 cat "$rawAuthorizedKeys" >> "$AUTHORIZED_KEYS"
 115             else
 116                 log debug "not adding raw authorized_keys file."
 117             fi
 118         else
 119             log debug "empty or absent authorized_keys file."
 120         fi
 121     fi
 122
 123     # move the new authorized_keys file into place
 124     if [ -s "$AUTHORIZED_KEYS" ] ; then
 125         # openssh appears to check the contents of the authorized_keys
 126         # file as the user in question, so the file must be readable
 127         # by that user at least.
 128
 129         # but in general, we don't want the user tampering with this
 130         # file directly, so we'll adopt this approach: Own the file by
 131         # the monkeysphere-server invoker (usually root, but should be
 132         # the same uid that sshd is launched as); change the group of
 133         # the file so that members of the user's group can read it.
 134
 135         # FIXME: is there a better way to do this?
 136         chown $(whoami) "$AUTHORIZED_KEYS" && \
 137             chgrp $(id -g "$uname") "$AUTHORIZED_KEYS" && \
 138             chmod g+r "$AUTHORIZED_KEYS" && \
 139             mv -f "$AUTHORIZED_KEYS" "${authorizedKeysDir}/${uname}" || \
 140             {
 141             log error "Failed to install authorized_keys for '$uname'!"
 142             rm -f "${authorizedKeysDir}/${uname}"
 143             # indicate that there has been a failure:
 144             returnCode=1
 145         }
 146     else
 147         rm -f "${authorizedKeysDir}/${uname}"
 148     fi
 149
 150     # unset the trap
 151     trap - EXIT
 152
 153     # destroy temporary directory
 154     rm -rf "$TMPLOC"
 155 done
 156
 157 return $returnCode
 158 }