2 # Copyright (c) 2004 Matthias S. Benkmann <article AT winterdrache DOT de>
3 # You may do everything with this code except misrepresent its origin.
4 # PROVIDED `AS IS' WITH ABSOLUTELY NO WARRANTY OF ANY KIND!
6 #The following list should contain the mount points of all filesystems
7 #that are to be scanned as a space-separated list within parentheses.
8 #/ will usually be in this list and if you have /usr
9 #on a separate partition, it will also be in this list. Other non-special
10 #filesystems where suspicious files could be located should also be put in
12 #Mount points whose filesystems are special, such as procfs or sysfs should
16 # fs_to_scan=(/ /opt /usr /usr/local /var)
20 #Files with a path prefix found in the following list are ignored.
21 #DO !!!!NOT!!! PUT /usr/src OR WHATEVER THE HOME DIRECTORY prefix is for your
22 #package users into this list!!! You DO want to scan those directories in
23 #order to spot e.g. world-writable tarballs and other abominations that
25 #Ideally, this list should be empty.
28 # prune_prefixes=(/*/\{arch\}) #NO TRAILING SLASHES!!!
32 #If the following variable is set to "yes", then files that contain
33 #control characters or other non-printable characters (except for space)
34 #will be reported as suspicious.
35 #This test slows down the search considerably!
39 #suppress ugly debug output from shell
42 #"-false" as 1st argument is used when called by list_suspicious_files_from
43 if [ $# -ge 1 -a "$1" != "-false" ]; then
45 echo 1>&2 "USAGE: ${0##*/}"
47 echo 1>&2 ' Outputs a categorized list of files and directories with properties'
48 echo 1>&2 ' that could mean trouble and should be investigated.'
54 usergroupmatch=(-true)
55 if [ "$1" = "-false" ]; then
56 usergroupmatch=(\( "$@" \))
59 #construct find commands that match the prune_prefixes. Each prefix will be
60 #matched as -path <prefix> -or -path <prefix>/*
61 #so that the directory itself and all subdirectories are matched.
63 for ((i=0; $i<${#prune_prefixes[@]}; i=$i+1))
67 y[${#y[@]}]="${prune_prefixes[$i]}"
70 y[${#y[@]}]="${prune_prefixes[$i]}/*"
74 illchars=( $'\x1' $'\x2' $'\x3' $'\x4' $'\x5' $'\x6' $'\x7' $'\x8'
75 $'\x9' $'\xA' $'\xB' $'\xC' $'\xD' $'\xE' $'\xF' $'\x10' $'\x11'
76 $'\x12' $'\x13' $'\x14' $'\x15' $'\x16' $'\x17' $'\x18' $'\x19'
77 $'\x1A' $'\x1B' $'\x1C' $'\x1D' $'\x1E' $'\x1F' $'\x7f' $'\x80'
78 $'\x81' $'\x82' $'\x83' $'\x84' $'\x85' $'\x86' $'\x87' $'\x88'
79 $'\x89' $'\x8A' $'\x8B' $'\x8C' $'\x8D' $'\x8E' $'\x8F' $'\x90'
80 $'\x91' $'\x92' $'\x93' $'\x94' $'\x95' $'\x96' $'\x97' $'\x98'
81 $'\x99' $'\x9A' $'\x9B' $'\x9C' $'\x9D' $'\x9E' $'\x9F' )
84 if [ "$enable_illchars" = yes ]; then
87 for ((i=0; $i<${#illchars[@]}; i=$i+1))
89 #handle bash \x7f error
90 if [ "*${illchars[$i]}*" = "**" ]; then
91 illchars[$i]=$'\x80' #'
93 illname[${#illname[@]}]='-or'
94 illname[${#illname[@]}]=-name
95 illname[${#illname[@]}]="*${illchars[$i]}*"
97 illname[${#illname[@]}]=')'
100 for ((i=0; $i<${#illchars[@]}; i=$i+1))
102 illlink[${#illlink[@]}]='-or'
103 illlink[${#illlink[@]}]=-lname
104 illlink[${#illlink[@]}]="*${illchars[$i]}*"
106 illlink[${#illlink[@]}]=')'
107 else #if [ "$enable_illchars" = no ]
116 echo -printf "increment_code_here"
118 echo "1 ${1}\\n" | sed 's/ /\\040/g'
119 echo -printf "insert_code_here"
123 echo "2 %i 1 ${2}\\n" | sed 's/ /\\040/g'
124 echo -printf "insert_code_here"
126 echo "2 %i 2 " | sed 's/ /\\040/g'
128 echo -printf "2\\040"
131 echo -exec ls -T 0 -ladQ {} \;
135 filegoodperm=(\( -perm 644 -or -perm 755 -or -perm 555 -or -perm 444 -or -perm 600 -or -perm 700 -or -perm 640 \))
136 dirgoodperm=(\( -perm 755 -or -perm 555 -or -perm 700 -or -perm 750 \))
139 -not \( -not -type d -links +1 \)
140 -not -nouser -not -nogroup
141 -not \( "${illname[@]}" \)
142 -not \( "${illlink[@]}" \)
146 \( -type f -not -group install "${filegoodperm[@]}" \)
147 -or \( -type d -not -group install "${dirgoodperm[@]}" \)
148 -or \( -type d -group install \( -perm 1775 \) \)
149 -or \( -type d -group root -user root -path "/tmp" \( -perm 1777 \) \)
150 -or \( -type d -group root -user root -path "/var/tmp" \( -perm 1777 \) \)
151 -or \( -not -type d -not -type f -not -type l -path "/dev/*" \)
152 -or \( -type l \( -xtype b -or -xtype c -or -xtype d -or -xtype p -or -xtype f \) \)
157 \( "${illname[@]}" $(report "NON-PRINTABLE CHAR IN NAME") \)
158 OP \( "${illlink[@]}" $(report "NON-PRINTABLE-CHAR IN LINK-TARGET") \)
159 OP \( -type f -perm -4000 $(report "SETUID FILES") \)
160 OP \( -type f -perm -2000 $(report "SETGID FILES") \)
161 OP \( -type f -perm -1000 $(report "STICKY FILES") \)
162 OP \( -type d -perm -2000 $(report "GROUP-KEEPING DIRECTORIES") \)
163 OP \( -type d -not -group install -perm -1000 $(report "STICKY DIRECTORIES") \)
164 OP \( -type f -perm -g+w $(report "GROUP-WRITABLE FILES") \)
165 OP \( -type f -perm -o+w $(report "WORLD-WRITABLE FILES") \)
166 OP \( -type d -perm -g+w $(report "GROUP-WRITABLE DIRECTORIES") \)
167 OP \( -type d -perm -o+w $(report "WORLD-WRITABLE DIRECTORIES") \)
168 OP \( -not \( -type f -or -type l -or -type d \) -not -path "/dev/*" $(report "SPECIAL FILES OUTSIDE /dev") \)
169 OP \( -type d -group install -not -perm 1755 $(report "INSTALL DIRECTORIES WITH UNUSUAL PERMISSIONS") \)
170 OP \( -type f -group install $(report "FILES ASSIGNED TO GROUP INSTALL") \)
171 OP \( -type l -not \( -xtype b -or -xtype c -or -xtype d -or -xtype p -or -xtype f \) $(report "SYMLINKS POSSIBLY BROKEN OR LOOP") \)
172 OP \( -not -type d -links +1 $(report "HARDLINKED FILES" "Inode %i is shared by %n files, including") \)
173 OP \( -nouser $(report "THINGS HAVING UID WITH NO ASSIGNED USER NAME") \)
174 OP \( -nogroup $(report "THINGS HAVING GID WITH NO ASSIGNED GROUP NAME") \)
175 OP \( -type f -not -group install -not "${filegoodperm[@]}" $(report "FILES WITH UNUSUAL PERMISSIONS") \)
176 OP \( -type d -not -group install -not "${dirgoodperm[@]}" $(report "DIRECTORIES WITH UNUSUAL PERMISSIONS") \)
179 #insert unique codes for the messages
181 for ((i=0; $i<${#bad[@]}; i=$i+1))
183 if [ "${bad[$i]}" = "increment_code_here" ]; then
186 elif [ "${bad[$i]}" = "insert_code_here" ]; then
191 allbad=() #all bad matches are reported
192 onebad=() #only the first bad match is reported
193 for ((i=0; $i<${#bad[@]}; i=$i+1))
195 if [ "${bad[$i]}" = "OP" ]; then
199 allbad[$i]="${bad[$i]}"
200 onebad[$i]="${bad[$i]}"
204 #Add a default case to onebad.
205 #This should never be hit, because the explicit cases should catch all
206 #files, but just in case I've missed something, this will catch it.
207 onebad=("${onebad[@]}" -or $(report "WEIRD SHIT") )
209 #make allbad always return false
210 allbad=("${allbad[@]}" , -false)
212 cmd=( "${usergroupmatch[@]}" -and
213 \( \( "${good[@]}" \) -or \( "${allbad[@]}" \) -or \( "${onebad[@]}" \) \)
216 #In the following find command, the part
217 # -not ( ( "${y[@]}" -prune ) -or "${y[@]}" )
218 #is responsible for preventing the files that match prune_prefixes from
219 #being processed. The 2nd "${y[@]}" may seem redundant, but it isn't, because
220 #-prune has no effect and is always false when -depth is used.
221 find "${fs_to_scan[@]}" -xdev -noleaf \
222 -not \( \( "${y[@]}" -prune \) -or "${y[@]}" \) \
223 -and \( "${cmd[@]}" \) 2>/dev/null |
224 sed 's/^\(...2\) \([0-9]\+ 2 \)\?\([^ ]\+\) \+[^ ]\+ \+\([^ ]\+\) \+\([^ ]\+\) \+[^"]\+\(".\+\)/\1 \2\3 \6 \4:\5/' |
226 sed 's/^...1 /\'$'\n''/;s/^...2 [0-9]\+ 1 /\'$'\n'' /;s/^...2 [0-9]\+ 2 / /;s/^...2 / /'