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=$(getent passwd | cut -d: -f1)
  28 fi
  29
  30 # set mode
  31 MODE="authorized_keys"
  32
  33 # set gnupg home
  34 GNUPGHOME="$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         # check permissions on the authorized_user_ids file path
  84         if check_key_file_permissions "$uname" "$authorizedUserIDs" ; then
  85             # copy user authorized_user_ids file to temporary
  86             # location
  87             cat "$authorizedUserIDs" > "$TMP_AUTHORIZED_USER_IDS"
  88
  89             # export needed variables
  90             export AUTHORIZED_KEYS
  91             export TMP_AUTHORIZED_USER_IDS
  92
  93             # process authorized_user_ids file, as monkeysphere user
  94             su_monkeysphere_user \
  95                 ". ${SYSSHAREDIR}/common; process_authorized_user_ids $TMP_AUTHORIZED_USER_IDS" \
  96                 || returnCode="$?"
  97         else
  98             log debug "not processing authorized_user_ids."
  99         fi
 100     else
 101         log debug "empty or absent authorized_user_ids file."
 102     fi
 103
 104     # add user-controlled authorized_keys file if specified translate
 105     # ssh-style path variables
 106     rawAuthorizedKeys=$(translate_ssh_variables "$uname" "$RAW_AUTHORIZED_KEYS")
 107     if [ "$rawAuthorizedKeys" != 'none' ] ; then
 108         log debug "checking for raw authorized_keys..."
 109         if [ -s "$rawAuthorizedKeys" ] ; then
 110             # check permissions on the authorized_keys file path
 111             if check_key_file_permissions "$uname" "$rawAuthorizedKeys" ; then
 112                 log verbose "adding raw authorized_keys file... "
 113                 cat "$rawAuthorizedKeys" >> "$AUTHORIZED_KEYS"
 114             else
 115                 log debug "not adding raw authorized_keys file."
 116             fi
 117         else
 118             log debug "empty or absent authorized_keys file."
 119         fi
 120     fi
 121
 122     # move the new authorized_keys file into place
 123     if [ -s "$AUTHORIZED_KEYS" ] ; then
 124         # openssh appears to check the contents of the authorized_keys
 125         # file as the user in question, so the file must be readable
 126         # by that user at least.
 127
 128         # but in general, we don't want the user tampering with this
 129         # file directly, so we'll adopt this approach: Own the file by
 130         # the monkeysphere-server invoker (usually root, but should be
 131         # the same uid that sshd is launched as); change the group of
 132         # the file so that members of the user's group can read it.
 133
 134         # FIXME: is there a better way to do this?
 135         chown $(whoami) "$AUTHORIZED_KEYS" && \
 136             chgrp $(id -g "$uname") "$AUTHORIZED_KEYS" && \
 137             chmod g+r "$AUTHORIZED_KEYS" && \
 138             mv -f "$AUTHORIZED_KEYS" "${authorizedKeysDir}/${uname}" || \
 139             {
 140             log error "Failed to install authorized_keys for '$uname'!"
 141             rm -f "${authorizedKeysDir}/${uname}"
 142             # indicate that there has been a failure:
 143             returnCode=1
 144         }
 145     else
 146         rm -f "${authorizedKeysDir}/${uname}"
 147     fi
 148
 149     # unset the trap
 150     trap - EXIT
 151
 152     # destroy temporary directory
 153     rm -rf "$TMPLOC"
 154 done
 155
 156 return $returnCode
 157 }