1 | #!/bin/bash |
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2 | |
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3 | # webaccess |
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4 | # Manage access control for scripts.mit.edu in .htaccess and .htpasswd files. |
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5 | # Anders Kaseorg <andersk@mit.edu> |
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6 | |
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7 | set -e |
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8 | |
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9 | on_exit= |
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10 | trap 'eval "$on_exit"' EXIT |
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11 | |
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12 | dir="$(pwd)" |
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13 | htaccess=$dir/.htaccess |
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14 | authuserfile=$dir/.htpasswd |
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15 | |
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16 | add_users= |
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17 | del_users= |
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18 | enable_auth=1 |
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19 | def_authname=\"Private\" |
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20 | |
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21 | begin_section="### BEGIN webaccess directives" |
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22 | end_section="### END webaccess directives" |
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23 | |
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24 | usage () { |
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25 | cat <<EOF >&2 |
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26 | usage: |
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27 | webaccess -a <user> Allow access from <user> and set password. |
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28 | webaccess -d <user> Deny access from <user>. |
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29 | webaccess -r Reset default access control. |
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30 | EOF |
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31 | exit 1 |
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32 | } |
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33 | |
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34 | getpass () { |
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35 | user=$1 |
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36 | ( |
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37 | echo -n "New password for $user: " >/dev/tty |
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38 | trap 'stty echo; echo >/dev/tty' EXIT |
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39 | stty -echo |
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40 | perl -e 'chop($_ = <>); print crypt($_, "\$1\$" . join "", (".", "/", "0".."9", "A".."Z", "a".."z") [rand 64, rand 64, rand 64, rand 64, rand 64, rand 64, rand 64, rand 64])' </dev/tty |
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41 | ) |
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42 | } |
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43 | |
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44 | if [ $# -eq 0 ]; then usage; fi |
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45 | |
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46 | while [ $# -gt 0 ]; do |
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47 | arg="$1"; shift |
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48 | case "$arg" in |
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49 | -a*) |
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50 | user="${arg#-a}" |
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51 | if [ -z "$user" ]; then user=$1; shift; fi |
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52 | if [ -z "$user" ]; then usage; fi |
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53 | add_users=$add_users\ $user |
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54 | ;; |
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55 | allow) |
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56 | user="$1"; shift |
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57 | if [ -z "$user" ]; then usage; fi |
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58 | add_users=$add_users\ $user |
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59 | ;; |
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60 | -d*) |
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61 | user="${arg#-d}" |
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62 | if [ -z "$user" ]; then user=$1; shift; fi |
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63 | if [ -z "$user" ]; then usage; fi |
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64 | del_users=$del_users\ $user |
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65 | ;; |
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66 | remove) |
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67 | user="$1"; shift |
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68 | if [ -z "$user" ]; then usage; fi |
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69 | del_users=$del_users\ $user |
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70 | ;; |
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71 | -r|reset) |
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72 | enable_auth=0 |
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73 | ;; |
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74 | -n*) |
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75 | authname="${arg#-n}" |
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76 | if [ -z "$authname" ]; then authname=\"$1\"; shift; fi |
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77 | if [ -z "$authname" ]; then usage; fi |
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78 | ;; |
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79 | *) |
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80 | usage |
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81 | ;; |
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82 | esac |
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83 | done |
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84 | |
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85 | tmp_htaccess=$htaccess.webaccess-new |
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86 | trap 'rm -f "$tmp_htaccess"' EXIT |
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87 | exec 3>"$tmp_htaccess" |
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88 | |
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89 | config_written=0 |
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90 | write_config () { |
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91 | if [ $config_written -eq 1 ]; then return 0; fi |
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92 | config_written=1 |
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93 | if [ $enable_auth -eq 1 ]; then |
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94 | echo "$begin_section" >&3 |
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95 | echo "# See http://scripts.mit.edu/faq/23" >&3 |
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96 | echo "AuthUserFile $authuserfile" >&3 |
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97 | echo "AuthName ${authname:-$def_authname}" >&3 |
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98 | echo "AuthType Basic" >&3 |
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99 | echo "Require valid-user" >&3 |
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100 | echo "$end_section" >&3 |
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101 | fi |
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102 | } |
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103 | |
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104 | if [ -e "$htaccess" ]; then |
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105 | exec 4<"$htaccess" |
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106 | |
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107 | oldconfig_state=0 |
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108 | oldconfig_buffer=__END__ |
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109 | |
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110 | while read -r line <&4; do |
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111 | oldconfig_newstate=0 |
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112 | case "$line" in |
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113 | "AuthUserFile "*) oldconfig_newstate=1 ;; |
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114 | "AuthName "*) oldconfig_newstate=2; oldconfig_authname=${line#AuthName } ;; |
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115 | "AuthType Basic") oldconfig_newstate=3 ;; |
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116 | "<Limit GET>") oldconfig_newstate=4 ;; |
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117 | "require valid-user") oldconfig_newstate=5 ;; |
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118 | "</Limit>") oldconfig_newstate=6 ;; |
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119 | esac |
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120 | |
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121 | if [ $oldconfig_newstate -ne $(($oldconfig_state + 1)) ]; then |
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122 | if [ $oldconfig_state -ne 0 ]; then |
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123 | echo "${oldconfig_buffer% |
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124 | __END__}" >&3 |
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125 | oldconfig_state=0 |
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126 | oldconfig_buffer=__END__ |
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127 | fi |
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128 | fi |
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129 | |
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130 | if [ "$line" = "$begin_section" ]; then |
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131 | while read -r line <&4 && [ "$line" != "$end_section" ]; do |
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132 | case "$line" in |
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133 | "AuthName "*) |
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134 | def_authname=${line#AuthName } |
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135 | ;; |
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136 | esac |
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137 | done |
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138 | write_config |
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139 | elif [ $oldconfig_newstate -eq $(($oldconfig_state + 1)) ]; then |
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140 | oldconfig_buffer=$(echo "${oldconfig_buffer%__END__}$line"; echo __END__) |
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141 | oldconfig_state=$oldconfig_newstate |
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142 | if [ $oldconfig_state -eq 6 ]; then |
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143 | echo "Replacing obsolete webaccess configuration." >&2 |
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144 | oldconfig_state=0 |
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145 | oldconfig_buffer=__END__ |
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146 | def_authname=$oldconfig_authname |
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147 | fi |
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148 | else |
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149 | echo "$line" >&3 |
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150 | fi |
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151 | done |
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152 | |
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153 | if [ $oldconfig_state -ne 0 ]; then |
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154 | echo "${oldconfig_buffer% |
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155 | __END__}" |
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156 | oldconfig_state=0 |
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157 | oldconfig_buffer=__END__ |
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158 | fi |
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159 | |
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160 | exec 4<&- |
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161 | fi |
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162 | |
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163 | write_config |
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164 | |
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165 | exec 3>&- |
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166 | if ! cmp -s "$htaccess" "$tmp_htaccess"; then |
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167 | if [ -s "$tmp_htaccess" ]; then |
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168 | echo "Updating $htaccess" >&2 |
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169 | mv -f "$tmp_htaccess" "$htaccess" |
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170 | else |
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171 | if [ -e "$htaccess" ]; then |
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172 | echo "Deleting $htaccess" >&2 |
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173 | rm -f "$htaccess" |
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174 | fi |
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175 | rm -f "$tmp_htaccess" |
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176 | fi |
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177 | fi |
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178 | trap - EXIT |
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179 | |
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180 | if [ $enable_auth -eq 1 ]; then |
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181 | if [ ! -e "$authuserfile" ]; then touch "$authuserfile"; fi |
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182 | |
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183 | tmp_authuserfile=$authuserfile.webaccess-new |
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184 | trap 'rm -f "$tmp_authuserfile"' EXIT |
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185 | exec 3>"$tmp_authuserfile" |
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186 | |
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187 | exec 4<"$authuserfile" |
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188 | while IFS=: read user pass <&4; do |
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189 | for del_user in $del_users; do |
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190 | if [ "$del_user" = "$user" ]; then |
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191 | echo "Deleting user $del_user:" >&2 |
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192 | pass= |
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193 | fi |
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194 | done |
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195 | new_add_users= |
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196 | for add_user in $add_users; do |
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197 | if [ "$add_user" = "$user" ]; then |
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198 | pass=$(getpass "$user") |
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199 | else |
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200 | new_add_users=$new_add_users\ $add_user |
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201 | fi |
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202 | done |
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203 | add_users=$new_add_users |
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204 | if [ -n "$pass" ]; then |
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205 | echo "$user:$pass" >&3 |
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206 | fi |
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207 | done |
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208 | exec 4<&- |
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209 | |
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210 | for add_user in $add_users; do |
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211 | pass=$(getpass "$add_user") |
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212 | echo "$add_user:$pass" >&3 |
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213 | done |
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214 | |
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215 | exec 3>&- |
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216 | mv -f "$tmp_authuserfile" "$authuserfile" |
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217 | trap - EXIT |
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218 | |
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219 | echo "Done. New list of valid users:" >&2 |
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220 | sed -n 's/^\([^:]*\):.*$/ \1/ p' "$authuserfile" |
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221 | else |
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222 | rm -f "$authuserfile" |
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223 | fi |
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