/usr/sbin/update-ca-certificates is in ca-certificates 20130906ubuntu2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 | #!/bin/sh -e
#
# update-ca-certificates
#
# Copyright (c) 2003 Fumitoshi UKAI <ukai@debian.or.jp>
# Copyright (c) 2009 Philipp Kern <pkern@debian.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, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02111-1301,
# USA.
#
verbose=0
fresh=0
while [ $# -gt 0 ];
do
  case $1 in
  --verbose|-v)
  	verbose=1;;
  --fresh|-f)
	fresh=1;;
  --help|-h|*)
	echo "$0: [--verbose] [--fresh]"
	exit;;
  esac
  shift
done
CERTSCONF=/etc/ca-certificates.conf
CERTSDIR=/usr/share/ca-certificates
LOCALCERTSDIR=/usr/local/share/ca-certificates
CERTBUNDLE=ca-certificates.crt
ETCCERTSDIR=/etc/ssl/certs
cleanup() {
  rm -f "$TEMPBUNDLE"
  rm -f "$ADDED"
  rm -f "$REMOVED"
}
trap cleanup 0
# Helper files.  (Some of them are not simple arrays because we spawn
# subshells later on.)
TEMPBUNDLE="$(mktemp -t "${CERTBUNDLE}.tmp.XXXXXX")"
ADDED="$(mktemp -t "ca-certificates.tmp.XXXXXX")"
REMOVED="$(mktemp -t "ca-certificates.tmp.XXXXXX")"
# Adds a certificate to the list of trusted ones.  This includes a symlink
# in /etc/ssl/certs to the certificate file and its inclusion into the
# bundle.
add() {
  CERT="$1"
  PEM="$ETCCERTSDIR/$(basename "$CERT" .crt | sed -e 's/ /_/g' \
                                                  -e 's/[()]/=/g' \
                                                  -e 's/,/_/g').pem"
  if ! test -e "$PEM" || [ "$(readlink "$PEM")" != "$CERT" ]
  then
    ln -sf "$CERT" "$PEM"
    echo +$PEM >> "$ADDED"
  fi
  cat "$CERT" >> "$TEMPBUNDLE"
}
remove() {
  CERT="$1"
  PEM="$ETCCERTSDIR/$(basename "$CERT" .crt).pem"
  if test -L "$PEM"
  then
    rm -f "$PEM"
    echo -$PEM >> "$REMOVED"
  fi
}
cd $ETCCERTSDIR
if [ "$fresh" = 1 ]; then
  echo -n "Clearing symlinks in $ETCCERTSDIR..."
  find . -type l -print | while read symlink
  do
     case $(readlink $symlink) in
     $CERTSDIR*) rm -f $symlink;;
     esac
  done
  find . -type l -print | while read symlink
  do
     test -f $symlink || rm -f $symlink
  done
  echo "done."
fi
echo -n "Updating certificates in $ETCCERTSDIR... "
# Handle certificates that should be removed.  This is an explicit act
# by prefixing lines in the configuration files with exclamation marks (!).
sed -n -e '/^$/d' -e 's/^!//p' $CERTSCONF | while read crt
do
  remove "$CERTSDIR/$crt"
done
sed -e '/^$/d' -e '/^#/d' -e '/^!/d' $CERTSCONF | while read crt
do
  if ! test -f "$CERTSDIR/$crt"
  then
    echo "W: $CERTSDIR/$crt not found, but listed in $CERTSCONF." >&2
    continue
  fi
  add "$CERTSDIR/$crt"
done
# Now process certificate authorities installed by the local system
# administrator.
if [ -d "$LOCALCERTSDIR" ]
then
  find -L "$LOCALCERTSDIR" -type f -name '*.crt' | while read crt
  do
    add "$crt"
  done
fi
rm -f "$CERTBUNDLE"
ADDED_CNT=$(wc -l < "$ADDED")
REMOVED_CNT=$(wc -l < "$REMOVED")
if [ "$ADDED_CNT" -gt 0 ] || [ "$REMOVED_CNT" -gt 0 ]
then
  # only run if set of files has changed
  if [ "$verbose" = 0 ]
  then
    c_rehash . > /dev/null
  else
    c_rehash .
  fi
fi
chmod 0644 "$TEMPBUNDLE"
mv -f "$TEMPBUNDLE" "$CERTBUNDLE"
echo "$ADDED_CNT added, $REMOVED_CNT removed; done."
HOOKSDIR=/etc/ca-certificates/update.d
echo -n "Running hooks in $HOOKSDIR...."
VERBOSE_ARG=
[ "$verbose" = 0 ] || VERBOSE_ARG=--verbose
eval run-parts $VERBOSE_ARG --test -- $HOOKSDIR | while read hook
do
  ( cat $ADDED
    cat $REMOVED ) | $hook || echo E: $hook exited with code $?.
done
echo "done."
# vim:set et sw=2:
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