| 1 | #!/bin/bash |
| 2 | # Get an AFS token for the given user. |
| 3 | # |
| 4 | # This is used to deliver mail with the appropriate credentials. |
| 5 | # |
| 6 | # Usage: |
| 7 | # |
| 8 | # get-token $USER |
| 9 | # - If user is root, call this script as $USER |
| 10 | # |
| 11 | # get-token $USER norecurse |
| 12 | # - Don't recursively call this script, even if user if root |
| 13 | |
| 14 | REALUSER=$(whoami) |
| 15 | USER=$1 |
| 16 | LOGFILE=/tmp/exim4/get-token-log.$USER |
| 17 | |
| 18 | if [ "$REALUSER" = "root" ]; then |
| 19 | if [ -n "$2" ]; then |
| 20 | echo "Error: running as root even after trying to change to $USER" \ |
| 21 | > $LOGFILE |
| 22 | exit 1 |
| 23 | fi |
| 24 | |
| 25 | # Decide whether the user exists: getent returns 0 error code if so |
| 26 | getent passwd "$USER" >/dev/null |
| 27 | if [ $? -ne 0 ]; then |
| 28 | echo "$USER is not a local user, so ignoring them" |
| 29 | exit 1 |
| 30 | else |
| 31 | exec su $USER -c "$0 $1 norecurse" |
| 32 | fi |
| 33 | fi |
| 34 | |
| 35 | # fuse stdin and stderr |
| 36 | exec 2>&1 |
| 37 | |
| 38 | # all future output goes to this file |
| 39 | exec >& $LOGFILE |
| 40 | |
| 41 | # print name of user |
| 42 | echo "Running as user $REALUSER" |
| 43 | |
| 44 | # set the credentials cache |
| 45 | export KRB5CCNAME=FILE:/tmp/exim4/krb5cc_$USER.email |
| 46 | |
| 47 | # eliminate any previous tokens |
| 48 | kdestroy |
| 49 | unlog |
| 50 | KEYTAB=/etc/keytabs/user.daemon/$USER |
| 51 | |
| 52 | # display command-to-be-invoked as a sanity check |
| 53 | echo kinit -kt $KEYTAB $USER/daemon@HCOOP.NET |
| 54 | |
| 55 | kinit -kt $KEYTAB $USER/daemon@HCOOP.NET |
| 56 | aklog |
| 57 | |
| 58 | # list tokens, for the sake of debugging |
| 59 | #tokens |