| 1 |
578 |
markom |
#!/depot/path/expect --
|
| 2 |
|
|
|
| 3 |
|
|
# This is a CGI script to process requests created by the accompanying
|
| 4 |
|
|
# passwd.html form. This script is pretty basic, although it is
|
| 5 |
|
|
# reasonably robust. (Purposely intent users can make the script bomb
|
| 6 |
|
|
# by mocking up their own HTML form, however they can't expose or steal
|
| 7 |
|
|
# passwords or otherwise open any security holes.) This script doesn't
|
| 8 |
|
|
# need any special permissions. The usual (ownership nobody) is fine.
|
| 9 |
|
|
#
|
| 10 |
|
|
# With a little more code, the script can do much more exotic things -
|
| 11 |
|
|
# for example, you could have the script:
|
| 12 |
|
|
#
|
| 13 |
|
|
# - telnet to another host first (useful if you run CGI scripts on a
|
| 14 |
|
|
# firewall), or
|
| 15 |
|
|
#
|
| 16 |
|
|
# - change passwords on multiple password server hosts, or
|
| 17 |
|
|
#
|
| 18 |
|
|
# - verify that passwords aren't in the dictionary, or
|
| 19 |
|
|
#
|
| 20 |
|
|
# - verify that passwords are at least 8 chars long and have at least 2
|
| 21 |
|
|
# digits, 2 uppercase, 2 lowercase, or whatever restrictions you like,
|
| 22 |
|
|
# or
|
| 23 |
|
|
#
|
| 24 |
|
|
# - allow short passwords by responding appropriately to passwd
|
| 25 |
|
|
#
|
| 26 |
|
|
# and so on. Have fun!
|
| 27 |
|
|
#
|
| 28 |
|
|
# Don Libes, NIST
|
| 29 |
|
|
|
| 30 |
|
|
puts "Content-type: text/html\n" ;# note extra newline
|
| 31 |
|
|
|
| 32 |
|
|
puts "
|
| 33 |
|
|
|
| 34 |
|
|
Passwd Change Acknowledgment
|
| 35 |
|
|
|
| 36 |
|
|
|
| 37 |
|
|
Passwd Change Acknowledgment
|
| 38 |
|
|
"
|
| 39 |
|
|
|
| 40 |
|
|
proc cgi2ascii {buf} {
|
| 41 |
|
|
regsub -all {\+} $buf { } buf
|
| 42 |
|
|
regsub -all {([\\["$])} $buf {\\\1} buf
|
| 43 |
|
|
regsub -all -nocase "%0d%0a" $buf "\n" buf
|
| 44 |
|
|
regsub -all -nocase {%([a-f0-9][a-f0-9])} $buf {[format %c 0x\1]} buf
|
| 45 |
|
|
eval return \"$buf\"
|
| 46 |
|
|
}
|
| 47 |
|
|
|
| 48 |
|
|
foreach pair [split [read stdin $env(CONTENT_LENGTH)] &] {
|
| 49 |
|
|
regexp (.*)=(.*) $pair dummy varname val
|
| 50 |
|
|
set val [cgi2ascii $val]
|
| 51 |
|
|
set var($varname) $val
|
| 52 |
|
|
}
|
| 53 |
|
|
|
| 54 |
|
|
log_user 0
|
| 55 |
|
|
|
| 56 |
|
|
proc errormsg {s} {puts "Error: $s"}
|
| 57 |
|
|
proc successmsg {s} {puts "$s"}
|
| 58 |
|
|
|
| 59 |
|
|
# Need to su first to get around passwd's requirement that passwd cannot
|
| 60 |
|
|
# be run by a totally unrelated user. Seems rather pointless since it's
|
| 61 |
|
|
# so easy to satisfy, eh?
|
| 62 |
|
|
|
| 63 |
|
|
# Change following line appropriately for your site.
|
| 64 |
|
|
# (We use yppasswd, but you might use something else.)
|
| 65 |
|
|
spawn /bin/su $var(name) -c "/bin/yppasswd $var(name)"
|
| 66 |
|
|
# This fails on SunOS 4.1.3 (passwd says "you don't have a login name")
|
| 67 |
|
|
# run on (or telnet first to) host running SunOS 4.1.4 or later.
|
| 68 |
|
|
|
| 69 |
|
|
expect {
|
| 70 |
|
|
"Unknown login:" {
|
| 71 |
|
|
errormsg "unknown user: $var(name)"
|
| 72 |
|
|
exit
|
| 73 |
|
|
} default {
|
| 74 |
|
|
errormsg "$expect_out(buffer)"
|
| 75 |
|
|
exit
|
| 76 |
|
|
} "Password:"
|
| 77 |
|
|
}
|
| 78 |
|
|
send "$var(old)\r"
|
| 79 |
|
|
expect {
|
| 80 |
|
|
"unknown user" {
|
| 81 |
|
|
errormsg "unknown user: $var(name)"
|
| 82 |
|
|
exit
|
| 83 |
|
|
} "Sorry" {
|
| 84 |
|
|
errormsg "Old password incorrect"
|
| 85 |
|
|
exit
|
| 86 |
|
|
} default {
|
| 87 |
|
|
errormsg "$expect_out(buffer)"
|
| 88 |
|
|
exit
|
| 89 |
|
|
} "Old password:"
|
| 90 |
|
|
}
|
| 91 |
|
|
send "$var(old)\r"
|
| 92 |
|
|
expect "New password:"
|
| 93 |
|
|
send "$var(new1)\r"
|
| 94 |
|
|
expect "New password:"
|
| 95 |
|
|
send "$var(new2)\r"
|
| 96 |
|
|
expect -re (.*)\r\n {
|
| 97 |
|
|
set error $expect_out(1,string)
|
| 98 |
|
|
}
|
| 99 |
|
|
|
| 100 |
|
|
if [info exists error] {
|
| 101 |
|
|
errormsg "$error"
|
| 102 |
|
|
} else {
|
| 103 |
|
|
successmsg "Password changed successfully."
|
| 104 |
|
|
}
|
| 105 |
|
|
|
