-#!/usr/bin/python
+#!/usr/bin/python3
+import logging, logging.handlers
+import os, sys, shlex, pwd
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~#
# Configuration
shell = None # set to "/bin/bash" or similar to allow shell access
+rrsync = "/usr/local/bin/schsh-rrsync" # path to the restricted rsync script - if available, it will be used to further restrict rsync access
-def allowSCP(run):
+def allowSCP(run, runstr):
if len(run) != 3: return False
if run[0] != "scp": return False
if run[1] not in ("-f", "-t"): return False
if run[2].startswith('-'): return False
+ run[0] = "/usr/bin/scp"
return True
-def allowRSync(run):
+def allowRSync(run, runstr):
if len(run) < 3: return False
if run[0] != "rsync": return False
if run[1] != "--server": return False
+ if rrsync is None:
+ # rrsync is not available, let's hope this is enough protection
+ run[0] = "/usr/bin/rsync"
+ return True
+ run[:] = [rrsync, "/", runstr] # allow access to the entire chroot
return True
-def allowSFTP(run):
- if len(run) != 1: return False
- return run[0] == "/usr/lib/openssh/sftp-server"
+def allowSFTP(run, runstr):
+ return runstr == "/usr/lib/openssh/sftp-server"
allowCommands = [allowSCP, allowRSync, allowSFTP]
-commandPaths = ["/usr/bin", "/bin"]
# END of Configuration
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~#
# DO NOT TOUCH ANYTHING BELOW THIS LINE
-import logging, logging.handlers
-import os, sys, shlex, pwd
logger = logging.getLogger("schsh")
logger.setLevel(logging.INFO)
log(msg, logging.ERROR)
sys.exit(1)
-def commandAllowed(run):
+def commandAllowed(run, runstr):
for allowed in allowCommands:
- if allowed(run):
+ if allowed(run, runstr):
return True
return False
-def addPath(prog):
- if prog.startswith("/"):
- return prog
- # look for it in the paths
- for path in commandPaths:
- fullprog = os.path.join(path, prog)
- if os.path.exists(fullprog):
- return fullprog
- return None
-
# parse arguments
run = []
if len(sys.argv) == 1:
if shell is None:
- print "No shell for you!"
+ print("No shell for you!")
logquit("Shell access not allowed")
else:
run = [shell]
elif len(sys.argv) == 3 and sys.argv[1] == "-c":
# check if the command is allowed, and add path
run = shlex.split(sys.argv[2])
- if commandAllowed(run):
- run[0] = addPath(run[0])
- log("Running '"+str(run)+"'")
+ if commandAllowed(run, sys.argv[2]): # this may change run, but that's okay
+ log("Running "+str(run))
else:
- print "You are not allowed to run this command."
+ print("You are not allowed to run this command.")
logquit("Attempt to run invalid command '"+sys.argv[2]+"'")
else:
logquit("Invalid arguments for schsh: "+str(sys.argv))