Move rest of the modules outside of nixops

2 files changed, 192 insertions, 0 deletions

diff --git a/modules/private/ssh/default.nix b/modules/private/ssh/default.nix
new file mode 100644
index 0000000..beedaff
--- /dev/null
+++ b/modules/private/ssh/default.nix
@@ -0,0 +1,40 @@
+{ lib, pkgs, config, myconfig, ... }:
+{
+  config = {
+    networking.firewall.allowedTCPPorts = [ 22 ];
+
+    services.openssh.extraConfig = ''
+      AuthorizedKeysCommand     /etc/ssh/ldap_authorized_keys
+      AuthorizedKeysCommandUser nobody
+      '';
+
+    secrets.keys = [{
+      dest = "ssh-ldap";
+      user = "nobody";
+      group = "nogroup";
+      permissions = "0400";
+      text = myconfig.env.sshd.ldap.password;
+    }];
+    system.activationScripts.sshd = {
+      deps = [ "secrets" ];
+      text = ''
+      install -Dm400 -o nobody -g nogroup -T /var/secrets/ssh-ldap /etc/ssh/ldap_password
+      '';
+    };
+    # ssh is strict about parent directory having correct rights, don't
+    # move it in the nix store.
+    environment.etc."ssh/ldap_authorized_keys" = let
+      ldap_authorized_keys =
+        pkgs.mylibs.wrap {
+          name = "ldap_authorized_keys";
+          file = ./ldap_authorized_keys.sh;
+          paths = [ pkgs.which pkgs.gitolite pkgs.openldap pkgs.stdenv.shellPackage pkgs.gnugrep pkgs.gnused pkgs.coreutils ];
+        };
+    in {
+      enable = true;
+      mode = "0755";
+      user = "root";
+      source = ldap_authorized_keys;
+    };
+  };
+}
diff --git a/modules/private/ssh/ldap_authorized_keys.sh b/modules/private/ssh/ldap_authorized_keys.sh
new file mode 100755
index 0000000..d556452
--- /dev/null
+++ b/modules/private/ssh/ldap_authorized_keys.sh
@@ -0,0 +1,152 @@
+#!/usr/bin/env bash
+
+LDAPSEARCH=ldapsearch
+KEY="immaeSshKey"
+LDAP_BIND="cn=ssh,ou=services,dc=immae,dc=eu"
+LDAP_PASS=$(cat /etc/ssh/ldap_password)
+LDAP_HOST="ldap.immae.eu"
+LDAP_MEMBER="cn=users,cn=ssh,ou=services,dc=immae,dc=eu"
+LDAP_GITOLITE_MEMBER="cn=users,cn=gitolite,ou=services,dc=immae,dc=eu"
+LDAP_PUB_RESTRICT_MEMBER="cn=restrict,cn=pub,ou=services,dc=immae,dc=eu"
+LDAP_PUB_FORWARD_MEMBER="cn=forward,cn=pub,ou=services,dc=immae,dc=eu"
+LDAP_BASE="dc=immae,dc=eu"
+GITOLITE_SHELL=$(which gitolite-shell)
+ECHO=$(which echo)
+
+suitable_for() {
+  type_for="$1"
+  key="$2"
+
+  if [[ $key != *$'\n'* ]] && [[ $key == ssh-* ]]; then
+    echo "$key"
+  else
+    key_type=$(cut -d " " -f 1 <<< "$key")
+
+    if grep -q "\b-$type_for\b" <<< "$key_type"; then
+      echo ""
+    elif grep -q "\b$type_for\b" <<< "$key_type"; then
+      echo $(sed -e "s/^[^ ]* //g" <<< "$key")
+    else
+      echo ""
+    fi
+  fi
+}
+
+clean_key_line() {
+  type_for="$1"
+  line="$2"
+
+  if [[ "$line" == $KEY::* ]]; then
+    # base64 keys should't happen, unless wrong copy-pasting
+    key=""
+  else
+    key=$(sed -e "s/^$KEY: *//" -e "s/ *$//" <<< "$line")
+  fi
+
+  suitable_for "$type_for" "$key"
+}
+
+ldap_search() {
+  $LDAPSEARCH -h $LDAP_HOST -ZZ -b $LDAP_BASE -D $LDAP_BIND -w "$LDAP_PASS" -x -o ldif-wrap=no -LLL "$@"
+}
+
+ldap_keys() {
+  user=$1;
+  if [[ $user == gitolite ]]; then
+    ldap_search '(&(memberOf='$LDAP_GITOLITE_MEMBER')('$KEY'=*))' $KEY | \
+      while read line ;
+      do
+        if [ ! -z "$line" ]; then
+          if [[ $line == dn* ]]; then
+            user=$(sed -n 's/.*uid=\([^,]*\).*/\1/p' <<< "$line")
+            if [ -n "$user" ]; then
+              if [[ $user == "immae" ]] || [[ $user == "denise" ]]; then
+                # Capitalize first letter (backward compatibility)
+                user=$(sed -r 's/^([a-z])/\U\1/' <<< "$user")
+              fi
+            else
+              # Service fake user
+              user=$(sed -n 's/.*cn=\([^,]*\).*/\1/p' <<< "$line")
+            fi
+          elif [[ $line == $KEY* ]]; then
+            key=$(clean_key_line git "$line")
+            if [ ! -z "$key" ]; then
+              if [[ $key != *$'\n'* ]] && [[ $key == ssh-* ]]; then
+                echo -n 'command="'$GITOLITE_SHELL' '$user'",no-port-forwarding,no-X11-forwarding,no-agent-forwarding,no-pty '
+                echo $key
+              fi
+            fi
+          fi
+        fi
+      done
+    exit 0
+  elif [[ $user == pub ]]; then
+    ldap_search '(&(memberOf='$LDAP_PUB_RESTRICT_MEMBER')('$KEY'=*))' $KEY | \
+      while read line ;
+      do
+        if [ ! -z "$line" ]; then
+          if [[ $line == dn* ]]; then
+            echo ""
+            user=$(sed -n 's/.*uid=\([^,]*\).*/\1/p' <<< "$line")
+            echo "# $user"
+          elif [[ $line == $KEY* ]]; then
+            key=$(clean_key_line pub "$line")
+            key_forward=$(clean_key_line forward "$line")
+            if [ ! -z "$key" ]; then
+              if [[ $key != *$'\n'* ]] && [[ $key == ssh-* ]]; then
+                echo -n 'command="/etc/profiles/per-user/pub/bin/restrict '$user'" '
+                echo $key
+              fi
+            elif [ ! -z "$key_forward" ]; then
+              if [[ $key_forward != *$'\n'* ]] && [[ $key_forward == ssh-* ]]; then
+                echo "# forward only"
+                echo -n 'no-pty,no-X11-forwarding,command="'$ECHO' forward only" '
+                echo $key_forward
+              fi
+            fi
+          fi
+        fi
+      done
+
+    echo ""
+    ldap_search '(&(memberOf='$LDAP_PUB_FORWARD_MEMBER')('$KEY'=*))' $KEY | \
+      while read line ;
+      do
+        if [ ! -z "$line" ]; then
+          if [[ $line == dn* ]]; then
+            echo ""
+            user=$(sed -n 's/.*uid=\([^,]*\).*/\1/p' <<< "$line")
+            echo "# $user"
+          elif [[ $line == $KEY* ]]; then
+            key=$(clean_key_line forward "$line")
+            if [ ! -z "$key" ]; then
+              if [[ $key != *$'\n'* ]] && [[ $key == ssh-* ]]; then
+                echo -n 'no-pty,no-X11-forwarding,command="'$ECHO' forward only" '
+                echo $key
+              fi
+            fi
+          fi
+        fi
+      done
+    exit 0
+  else
+    ldap_search '(&(memberOf='$LDAP_MEMBER')('$KEY'=*)(uid='$user'))' $KEY | \
+      while read line ;
+      do
+        if [ ! -z "$line" ]; then
+          if [[ $line == dn* ]]; then
+            user=$(sed -n 's/.*uid=\([^,]*\).*/\1/p' <<< "$line")
+          elif [[ $line == $KEY* ]]; then
+            key=$(clean_key_line ssh "$line")
+            if [ ! -z "$key" ]; then
+              if [[ $key != *$'\n'* ]] && [[ $key == ssh-* ]]; then
+                echo $key
+              fi
+            fi
+          fi
+        fi
+      done
+  fi
+}
+
+ldap_keys $@