v0.9.5 -- single class -- checking if this helps us with a couple of issues

plugin.rb

@@ -4,7 +4,7 @@
 
 # name: discourse-md5_authentication
 # about: A plugin to authenticate users with MD5 passwords from legacy systems
-# version: 0.9.3
+# version: 0.9.5
 # authors: saint
 # url: https://gitea.federated.computer/saint/discourse-md5_authentication.git
 
@@ -12,102 +12,24 @@
 
 after_initialize do
   class ::SessionController < ApplicationController
+    # Constants
     ITOA64 = "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
 
-    def to64(value, length)
-      result = ""
-      length.times do
-        result << ITOA64[value & 0x3f]
-        value >>= 6
-      end
-      result
-    end
-
-    def gossamer_md5_crypt(password, legacy_hash)
-      # Extract the salt from the legacy hash
-      parts = legacy_hash.split('$')
-      salt = parts[2]
-
-      # Limit the salt to 8 characters
-      salt = salt[0, 8]
-
-      magic = "$GT$"
-      Rails.logger.debug "MD5 magic: #{magic}"
-
-      ctx = Digest::MD5.new
-      ctx.update(password)
-      ctx.update(magic)
-      ctx.update(salt)
-
-      final = Digest::MD5.new
-      final.update(password)
-      final.update(salt)
-      final.update(password)
-      final_digest = final.digest
-
-      password_length = password.length
-
-      while password_length > 0
-        ctx.update(final_digest[0, [password_length, 16].min])
-        password_length -= 16
-      end
-
-      password_length = password.length
-      while password_length > 0
-        if password_length & 1 != 0
-          ctx.update("\x00")
-        else
-          ctx.update(password[0, 1])
-        end
-        password_length >>= 1
-      end
-
-      final_digest = ctx.digest
-      Rails.logger.debug "MD5 final_digest: #{final_digest}"
-
-      1000.times do |i|
-        ctx1 = Digest::MD5.new
-        if i & 1 != 0
-          ctx1.update(password)
-        else
-          ctx1.update(final_digest)
-        end
-        ctx1.update(salt) if i % 3 != 0
-        ctx1.update(password) if i % 7 != 0
-        if i & 1 != 0
-          ctx1.update(final_digest)
-        else
-          ctx1.update(password)
-        end
-        final_digest = ctx1.digest
-      end
-
-      result = ''
-      result << to64((final_digest[0].ord << 16) | (final_digest[6].ord << 8) | final_digest[12].ord, 4)
-      result << to64((final_digest[1].ord << 16) | (final_digest[7].ord << 8) | final_digest[13].ord, 4)
-      result << to64((final_digest[2].ord << 16) | (final_digest[8].ord << 8) | final_digest[14].ord, 4)
-      result << to64((final_digest[3].ord << 16) | (final_digest[9].ord << 8) | final_digest[15].ord, 4)
-      result << to64((final_digest[4].ord << 16) | (final_digest[10].ord << 8) | final_digest[5].ord, 4)
-      result << to64(final_digest[11].ord, 2)
-
-      "#{magic}#{salt}$#{result}"
-    end
-
-    def verify_gossamer_password(password, legacy_hash)
-      generated_hash = gossamer_md5_crypt(password, legacy_hash)
-      generated_hash == legacy_hash
-    end
-
     def create
+      # Require the necessary parameters
       params.require(:login)
       params.require(:password)
 
+      # Validate password length
       return invalid_credentials if params[:password].length > User.max_password_length
 
+      # Find user by username or email
       user = User.find_by_username_or_email(normalized_login_param)
 
+      # Check for read-only mode for non-staff users
       raise Discourse::ReadOnly if staff_writes_only_mode? && !user&.staff?
 
+      # Apply rate limit for second factor authentication
       rate_limit_second_factor!(user)
 
       if user.present?
@@ -115,59 +37,157 @@ after_initialize do
         custom_password_md5 = user.custom_fields['custom_password_md5']
 
         # Check for MD5 password in custom field
-        Rails.logger.debug "Check for MD5 password in custom field"
         if custom_password_md5.present?
-          # MD5 password is present
-          Rails.logger.debug "MD5 password is present custom_password_md5: #{custom_password_md5} password: #{password}"
+          Rails.logger.debug "MD6 password is present. custom_password_md5: #{custom_password_md5}, password: #{password}"
 
-          if verify_gossamer_password(password, custom_password_md5)
-            # MD5 matches, so update the user's password to the new one and remove the custom field
-            Rails.logger.debug "MD5 matches"
+          # Extract the salt from the legacy hash
+          parts = custom_password_md5.split('$')
+          Rails.logger.debug "MD7"
+          salt = parts[2][0, 8]
+          Rails.logger.debug "MD8"
+          magic = "$GT$"
+          Rails.logger.debug "MD9"
+          Rails.logger.debug "MD5 magic: #{magic}, salt: #{salt}"
+
+          # Create initial MD5 context
+          ctx = Digest::MD5.new
+          ctx.update(password)
+          ctx.update(magic)
+          ctx.update(salt)
+
+          # Create final MD5 digest
+          final = Digest::MD5.new
+          final.update(password)
+          final.update(salt)
+          final.update(password)
+          final_digest = final.digest
+
+          # Perform password length operations
+          password_length = password.length
+          while password_length > 0
+            ctx.update(final_digest[0, [password_length, 16].min])
+            password_length -= 16
+          end
+
+          password_length = password.length
+          while password_length > 0
+            if password_length & 1 != 0
+              ctx.update("\x00")
+            else
+              ctx.update(password[0, 1])
+            end
+            password_length >>= 1
+          end
+
+          final_digest = ctx.digest
+          Rails.logger.debug "MD5 final_digest after initial operations: #{final_digest}"
+
+          # Perform 1000 iterations of MD5 hashing
+          1000.times do |i|
+            ctx1 = Digest::MD5.new
+            if i & 1 != 0
+              ctx1.update(password)
+            else
+              ctx1.update(final_digest)
+            end
+            ctx1.update(salt) if i % 3 != 0
+            ctx1.update(password) if i % 7 != 0
+            if i & 1 != 0
+              ctx1.update(final_digest)
+            else
+              ctx1.update(password)
+            end
+            final_digest = ctx1.digest
+          end
+
+          # Convert final digest to the hashed password format
+          result = ''
+          length = 4
+          value = (final_digest[0].ord << 16) | (final_digest[6].ord << 8) | final_digest[12].ord
+          length.times do
+            result << ITOA64[value & 0x3f]
+            value >>= 6
+          end
+          value = (final_digest[1].ord << 16) | (final_digest[7].ord << 8) | final_digest[13].ord
+          length.times do
+            result << ITOA64[value & 0x3f]
+            value >>= 6
+          end
+          value = (final_digest[2].ord << 16) | (final_digest[8].ord << 8) | final_digest[14].ord
+          length.times do
+            result << ITOA64[value & 0x3f]
+            value >>= 6
+          end
+          value = (final_digest[3].ord << 16) | (final_digest[9].ord << 8) | final_digest[15].ord
+          length.times do
+            result << ITOA64[value & 0x3f]
+            value >>= 6
+          end
+          value = (final_digest[4].ord << 16) | (final_digest[10].ord << 8) | final_digest[5].ord
+          length.times do
+            result << ITOA64[value & 0x3f]
+            value >>= 6
+          end
+          length = 2
+          value = final_digest[11].ord
+          length.times do
+            result << ITOA64[value & 0x3f]
+            value >>= 6
+          end
+
+          entered_password_md5 = "#{magic}#{salt}$#{result}"
+          Rails.logger.debug "Generated MD5 hash: #{entered_password_md5}"
+
+          # Verify the entered password MD5 hash against the stored hash
+          if entered_password_md5 == custom_password_md5
+            Rails.logger.debug "MD5 hash matches for user: #{user.id}"
+
+            # MD5 matches, update the user's password to the new one and remove the custom field
             user.password = password
             user.custom_fields['custom_password_md5'] = nil
             user.save!
             Rails.logger.debug "Updated MD5 password for user: #{user.id}"
           else
-            # MD5 doesn't match, so we have a failed login attempt.
-            Rails.logger.debug "MD5 Password incorrect for user: #{user.id}"
-            invalid_credentials
-            return
+            Rails.logger.debug "MD5 password incorrect for user: #{user.id}"
+            return invalid_credentials
           end
 
         elsif !user.confirm_password?(password)
-          # There is no MD5 password and the password was incorrect.
           Rails.logger.debug "Password incorrect for user: #{user.id}"
-          invalid_credentials
-          return
+          return invalid_credentials
         end
 
-        # If the site requires user approval and the user is not approved yet
+        # Handle user approval requirements
         if login_not_approved_for?(user)
           render json: login_not_approved
           return
         end
 
-        # User signed on with username and password, so let's prevent the invite link
-        # from being used to log in (if one exists).
+        # Invalidate invite link if user signed on with username and password
         Invite.invalidate_for_email(user.email)
 
-        # User's password has expired so they need to reset it
+        # Handle password expiration
         if user.password_expired?(password)
           render json: { error: "expired", reason: "expired" }
           return
         end
       else
-        invalid_credentials
-        return
+        Rails.logger.debug "User not found with login: #{params[:login]}"
+        return invalid_credentials
       end
 
       if payload = login_error_check(user)
         return render json: payload
       end
 
+      # Perform second factor authentication
       second_factor_auth_result = authenticate_second_factor(user)
-      return render(json: @second_factor_failure_payload) unless second_factor_auth_result.ok
+      unless second_factor_auth_result.ok
+        Rails.logger.debug "Second factor authentication failed for user: #{user.id}"
+        return render(json: @second_factor_failure_payload)
+      end
 
+      # Handle active and email confirmed users
       if user.active && user.email_confirmed?
         login(user, second_factor_auth_result)
       else