GUACAMOLE-1289: Modify the Authentication Service to no longer explicitly compare state query string.

doc/licenses/okhttp-3.14.9/README

@@ -5,4 +5,3 @@ okhttp (https://square.github.io/okhttp/)
     From: 'Square Inc'
     License(s):
         Apache 2.0
-

doc/licenses/okhttp-4.9.1/LICENSE.txt

@@ -0,0 +1,201 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
+      the copyright owner. For the purposes of this definition, "submitted"
+      means any form of electronic, verbal, or written communication sent
+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
+      excluding communication that is conspicuously marked or otherwise
+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
+      publicly display, publicly perform, sublicense, and distribute the
+      Work and such Derivative Works in Source or Object form.
+
+   3. Grant of Patent License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      (except as stated in this section) patent license to make, have made,
+      use, offer to sell, sell, import, and otherwise transfer the Work,
+      where such license applies only to those patent claims licensable
+      by such Contributor that are necessarily infringed by their
+      Contribution(s) alone or by combination of their Contribution(s)
+      with the Work to which such Contribution(s) was submitted. If You
+      institute patent litigation against any entity (including a
+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
+      granted to You under this License for that Work shall terminate
+      as of the date such litigation is filed.
+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
+      modifications, and in Source or Object form, provided that You
+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
+          attribution notices from the Source form of the Work,
+          excluding those notices that do not pertain to any part of
+          the Derivative Works; and
+
+      (d) If the Work includes a "NOTICE" text file as part of its
+          distribution, then any Derivative Works that You distribute must
+          include a readable copy of the attribution notices contained
+          within such NOTICE file, excluding those notices that do not
+          pertain to any part of the Derivative Works, in at least one
+          of the following places: within a NOTICE text file distributed
+          as part of the Derivative Works; within the Source form or
+          documentation, if provided along with the Derivative Works; or,
+          within a display generated by the Derivative Works, if and
+          wherever such third-party notices normally appear. The contents
+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
+          or as an addendum to the NOTICE text from the Work, provided
+          that such additional attribution notices cannot be construed
+          as modifying the License.
+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
+      replaced with your own identifying information. (Don't include
+      the brackets!)  The text should be enclosed in the appropriate
+      comment syntax for the file format. We also recommend that a
+      file or class name and description of purpose be included on the
+      same "printed page" as the copyright notice for easier
+      identification within third-party archives.
+
+   Copyright [yyyy] [name of copyright owner]
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.

doc/licenses/okhttp-4.9.1/NOTICE

@@ -0,0 +1,13 @@
+Copyright 2021 Square, Inc.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+   http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.

doc/licenses/okhttp-4.9.1/README

@@ -0,0 +1,7 @@
+okhttp (https://square.github.io/okhttp/)
+---------------------------------------------
+
+    Version: 4.9.1
+    From: 'Square Inc'
+    License(s):
+        Apache 2.0

doc/licenses/okhttp-4.9.1/dep-coordinates.txt

@@ -0,0 +1 @@
+com.squareup.okhttp3:okhttp:jar:4.9.1

doc/licenses/okio-1.17.2/README

@@ -5,4 +5,3 @@ okio (https://square.github.io/okio/)
     From: 'Square Inc'
     License(s):
         Apache 2.0 (bundled/retrofit-2.9.0/LICENSE.txt)
-

doc/licenses/okio-2.8.0/LICENSE.txt

@@ -0,0 +1,201 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
+      the copyright owner. For the purposes of this definition, "submitted"
+      means any form of electronic, verbal, or written communication sent
+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
+      excluding communication that is conspicuously marked or otherwise
+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
+      publicly display, publicly perform, sublicense, and distribute the
+      Work and such Derivative Works in Source or Object form.
+
+   3. Grant of Patent License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      (except as stated in this section) patent license to make, have made,
+      use, offer to sell, sell, import, and otherwise transfer the Work,
+      where such license applies only to those patent claims licensable
+      by such Contributor that are necessarily infringed by their
+      Contribution(s) alone or by combination of their Contribution(s)
+      with the Work to which such Contribution(s) was submitted. If You
+      institute patent litigation against any entity (including a
+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
+      granted to You under this License for that Work shall terminate
+      as of the date such litigation is filed.
+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
+      modifications, and in Source or Object form, provided that You
+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
+          attribution notices from the Source form of the Work,
+          excluding those notices that do not pertain to any part of
+          the Derivative Works; and
+
+      (d) If the Work includes a "NOTICE" text file as part of its
+          distribution, then any Derivative Works that You distribute must
+          include a readable copy of the attribution notices contained
+          within such NOTICE file, excluding those notices that do not
+          pertain to any part of the Derivative Works, in at least one
+          of the following places: within a NOTICE text file distributed
+          as part of the Derivative Works; within the Source form or
+          documentation, if provided along with the Derivative Works; or,
+          within a display generated by the Derivative Works, if and
+          wherever such third-party notices normally appear. The contents
+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
+          or as an addendum to the NOTICE text from the Work, provided
+          that such additional attribution notices cannot be construed
+          as modifying the License.
+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
+      replaced with your own identifying information. (Don't include
+      the brackets!)  The text should be enclosed in the appropriate
+      comment syntax for the file format. We also recommend that a
+      file or class name and description of purpose be included on the
+      same "printed page" as the copyright notice for easier
+      identification within third-party archives.
+
+   Copyright [yyyy] [name of copyright owner]
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.

doc/licenses/okio-2.8.0/NOTICE

@@ -0,0 +1,13 @@
+Copyright 2020 Square, Inc.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+   http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.

doc/licenses/okio-2.8.0/README

@@ -0,0 +1,7 @@
+okio (https://square.github.io/okio/)
+---------------------------------------------
+
+    Version: 2.8.0
+    From: 'Square Inc'
+    License(s):
+        Apache 2.0 (bundled/retrofit-2.9.0/LICENSE.txt)

doc/licenses/okio-2.8.0/dep-coordinates.txt

@@ -0,0 +1 @@
+com.squareup.okio:okio:jar:2.8.0

doc/licenses/spring-web-5.3.25/LICENSE

@@ -0,0 +1,202 @@
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        https://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
+      the copyright owner. For the purposes of this definition, "submitted"
+      means any form of electronic, verbal, or written communication sent
+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
+      excluding communication that is conspicuously marked or otherwise
+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
+      publicly display, publicly perform, sublicense, and distribute the
+      Work and such Derivative Works in Source or Object form.
+
+   3. Grant of Patent License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      (except as stated in this section) patent license to make, have made,
+      use, offer to sell, sell, import, and otherwise transfer the Work,
+      where such license applies only to those patent claims licensable
+      by such Contributor that are necessarily infringed by their
+      Contribution(s) alone or by combination of their Contribution(s)
+      with the Work to which such Contribution(s) was submitted. If You
+      institute patent litigation against any entity (including a
+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
+      granted to You under this License for that Work shall terminate
+      as of the date such litigation is filed.
+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
+      modifications, and in Source or Object form, provided that You
+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
+          attribution notices from the Source form of the Work,
+          excluding those notices that do not pertain to any part of
+          the Derivative Works; and
+
+      (d) If the Work includes a "NOTICE" text file as part of its
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doc/licenses/spring-web-5.3.25/README

@@ -0,0 +1,7 @@
+Spring Framework (https://spring.io/projects/spring-framework)
+--------------------------------------------------------------
+
+    Version: 5.3.25
+    From: 'Spring' (https://spring.io/)
+    License(s):
+        Apache v2.0

doc/licenses/spring-web-5.3.25/dep-coordinates.txt

@@ -0,0 +1,4 @@
+org.springframework:spring-web:jar:5.3.25
+org.springframework:spring-beans:jar:5.3.25
+org.springframework:spring-core:jar:5.3.25
+org.springframework:spring-jcl:jar:5.3.25

extensions/guacamole-auth-duo/pom.xml

@@ -39,9 +39,33 @@
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <enforcer.skip>true</enforcer.skip>
     </properties>
 
+    <dependencyManagement>
+        <dependencies>
+            <!-- Define okhttp version to use everywhere to resolve conflict -->
+            <dependency>
+                <groupId>com.squareup.okhttp3</groupId>
+                <artifactId>okhttp</artifactId>
+                <version>4.9.1</version> <!-- Specify the desired version -->
+            </dependency>
+
+            <!-- Force the use of a consistent version of Kotlin standard library common -->
+            <dependency>
+                <groupId>org.jetbrains.kotlin</groupId>
+                <artifactId>kotlin-stdlib-common</artifactId>
+                <version>1.4.10</version>
+            </dependency>
+
+            <dependency>
+                <groupId>org.jetbrains.kotlin</groupId>
+                <artifactId>kotlin-stdlib</artifactId>
+                <version>1.4.10</version>
+            </dependency>
+
+        </dependencies>
+    </dependencyManagement>
+
     <dependencies>
 
        <!-- Guacamole Extension API -->
@@ -79,11 +103,11 @@
             <version>1.1.3</version>
         </dependency>
         
-        <!-- kotlin-stdlib-common -->
+        <!-- spring-web -->
         <dependency>
-            <groupId>org.jetbrains.kotlin</groupId>
+            <groupId>org.springframework</groupId>
-            <artifactId>kotlin-stdlib-common</artifactId>
+            <artifactId>spring-web</artifactId>
-            <version>1.4.10</version>
+            <version>5.3.25</version>
         </dependency>
 
     </dependencies>

extensions/guacamole-auth-duo/src/main/java/org/apache/guacamole/auth/duo/DuoAuthenticationProvider.java

@@ -33,6 +33,13 @@ import org.apache.guacamole.net.auth.UserContext;
  */
 public class DuoAuthenticationProvider extends AbstractAuthenticationProvider {
 
+    /**
+     * The unique identifier for this authentication provider. This is used in
+     * various parts of the Guacamole client to distinguish this provider from
+     * others, particularly when multiple authentication providers are used.
+     */
+    public static String PROVIDER_IDENTIFER = "duo";
+
     /**
      * Injector which will manage the object graph of this authentication
      * provider.
@@ -58,7 +65,7 @@ public class DuoAuthenticationProvider extends AbstractAuthenticationProvider {
 
     @Override
     public String getIdentifier() {
-        return "duo";
+        return PROVIDER_IDENTIFER;
     }
 
     @Override

extensions/guacamole-auth-duo/src/main/java/org/apache/guacamole/auth/duo/DuoAuthenticationProviderModule.java

@@ -73,7 +73,6 @@ public class DuoAuthenticationProviderModule extends AbstractModule {
         // Bind Duo-specific services
         bind(ConfigurationService.class);
         bind(UserVerificationService.class);
-        
     }
 
 }

extensions/guacamole-auth-duo/src/main/java/org/apache/guacamole/auth/duo/UserVerificationService.java

@@ -39,6 +39,7 @@ import org.apache.guacamole.net.auth.Credentials;
 import org.apache.guacamole.net.auth.credentials.CredentialsInfo;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
+import org.springframework.web.util.UriComponentsBuilder;
 
 /**
  * Service for verifying the identity of a user against Duo.
@@ -51,13 +52,13 @@ public class UserVerificationService {
      * The name of the parameter which Duo will return in it's GET call-back
      * that contains the code that the client will use to generate a token.
      */
-    private static final String DUO_CODE_PARAMETER_NAME = "duo_code";
+    public static final String DUO_CODE_PARAMETER_NAME = "duo_code";
     
     /**
      * The name of the parameter that will be used in the GET call-back that
      * contains the session state.
      */
-    private static final String DUO_STATE_PARAMETER_NAME = "state";
+    public static final String DUO_STATE_PARAMETER_NAME = "state";
     
     /**
      * The value that will be returned in the token if Duo authentication
@@ -101,12 +102,20 @@ public class UserVerificationService {
 
         try {
 
+        String redirectUrl = confService.getRedirectUrl().toString();
+
+        String builtUrl = UriComponentsBuilder
+                .fromUriString(redirectUrl)
+                .queryParam(Credentials.RESUME_QUERY, DuoAuthenticationProvider.PROVIDER_IDENTIFER)
+                .build()
+                .toUriString();
+
         // Set up the Duo Client
         Client duoClient = new Client.Builder(
                 confService.getClientId(),
                 confService.getClientSecret(),
                 confService.getAPIHostname(),
-                confService.getRedirectUrl().toString())
+                builtUrl)
                 .build();
         
         duoClient.healthCheck();
@@ -133,8 +142,8 @@ public class UserVerificationService {
                             new TranslatableMessage("LOGIN.INFO_DUO_REDIRECT_PENDING")
                     )
                 )),
-                duoState,
+                duoState, DuoAuthenticationProvider.PROVIDER_IDENTIFER, 
-                expirationTimestamp
+                DUO_STATE_PARAMETER_NAME, expirationTimestamp
             );
 
         }

guacamole-ext/src/main/java/org/apache/guacamole/language/TranslatableGuacamoleInsufficientCredentialsException.java

@@ -158,13 +158,21 @@ public class TranslatableGuacamoleInsufficientCredentialsException
      *     An opaque value that may be used by a client to maintain state across requests which are part
      *     of the same authentication transaction.
      * 
+     * @param providerIdentifier
+     *     The identifier of the authentication provider that this exception pertains to.
+     *
+     * @param queryIdentifier
+     *     The identifier of the specific query parameter within the
+     *     authentication process that this exception pertains to.
+     *
      * @param expires
      *     The timestamp after which the state token associated with the authentication process expires,
      *     specified as the number of milliseconds since the UNIX epoch.
      */
     public TranslatableGuacamoleInsufficientCredentialsException(String message,
-            String key, CredentialsInfo credentialsInfo, String state, long expires) {
+            String key, CredentialsInfo credentialsInfo, String state, String providerIdentifier, 
-                super(message, credentialsInfo, state, expires);
+            String queryIdentifier, long expires) {
+        super(message, credentialsInfo, state, providerIdentifier, queryIdentifier, expires);
         this.translatableMessage = new TranslatableMessage(key);
     }
 

guacamole-ext/src/main/java/org/apache/guacamole/net/auth/Credentials.java

@@ -34,6 +34,16 @@ import javax.servlet.http.HttpSession;
  */
 public class Credentials implements Serializable {
 
+    /**
+     * The RESUME_QUERY is a query parameter key used to determine which
+     * authentication provider's process should be resumed during multi-step
+     * authentication. The auth provider will set this parameter before 
+     * redirecting to an external service, and it is checked upon return to 
+     * Guacamole to ensure the correct authentication state is continued 
+     * without starting over.
+     */
+    public static final String RESUME_QUERY = "provider_id";
+
     /**
      * Unique identifier associated with this specific version of Credentials.
      */

guacamole-ext/src/main/java/org/apache/guacamole/net/auth/credentials/GuacamoleInsufficientCredentialsException.java

@@ -33,6 +33,20 @@ public class GuacamoleInsufficientCredentialsException extends GuacamoleCredenti
  */
 private static final String DEFAULT_STATE = "";
 
+/**
+ * The default provider identifier to use when no specific provider is identified.
+ * This serves as a placeholder indicating that either no specific provider is
+ * responsible for the exception or the responsible provider has not been identified.
+ */
+private static final String DEFAULT_PROVIDER_IDENTIFIER = "";
+
+/**
+ * The default query identifier to use when no specific query is identified.
+ * This serves as a placeholder and indicates that the specific query related to
+ * the provider's state resume operation has not been provided.
+ */
+private static final String DEFAULT_QUERY_IDENTIFIER = "";
+
 /**
  * The default expiration timestamp to use when no specific expiration is provided,
  * effectively indicating that the state token does not expire.
@@ -45,6 +59,20 @@ private static final long DEFAULT_EXPIRES = -1L;
  */
 protected final String state;
 
+    /**
+     * The identifier for the authentication provider that threw this exception.
+     * This is used to link the exception back to the originating source of the
+     * authentication attempt, allowing clients to determine which provider's
+     * authentication process should be resumed.
+     */
+    protected final String providerIdentifier;
+
+    /**
+     * An identifier for the specific query within the URL for this provider that can
+     * be checked to resume the authentication state.
+     */
+    protected final String queryIdentifier;
+
 /**
  * The timestamp after which the state token associated with the authentication process
  * should no longer be considered valid, expressed as the number of milliseconds since
@@ -67,15 +95,25 @@ protected final long expires;
      *     An opaque value that may be used by a client to maintain state
      *     across requests which are part of the same authentication transaction.
      *
+     * @param providerIdentifier
+     *     The identifier of the authentication provider that this exception pertains to.
+     *
+     * @param queryIdentifier
+     *     The identifier of the specific query parameter within the
+     *     authentication process that this exception pertains to.
+     * 
      * @param expires
      *     The timestamp after which the state token associated with the
      *     authentication process should no longer be considered valid, expressed
      *     as the number of milliseconds since UNIX epoch.
      */
    public GuacamoleInsufficientCredentialsException(String message,
-            CredentialsInfo credentialsInfo, String state, long expires) {
+            CredentialsInfo credentialsInfo, String state, String providerIdentifier, String queryIdentifier, 
+            long expires) {
         super(message, credentialsInfo);
         this.state = state;
+        this.providerIdentifier = providerIdentifier;
+        this.queryIdentifier = queryIdentifier;
         this.expires = expires;
     }
 
@@ -96,6 +134,8 @@ protected final long expires;
             CredentialsInfo credentialsInfo) {
         super(message, cause, credentialsInfo);
         this.state = DEFAULT_STATE;
+        this.providerIdentifier = DEFAULT_PROVIDER_IDENTIFIER;
+        this.queryIdentifier = DEFAULT_QUERY_IDENTIFIER;
         this.expires = DEFAULT_EXPIRES;
     }
 
@@ -112,6 +152,8 @@ protected final long expires;
     public GuacamoleInsufficientCredentialsException(String message, CredentialsInfo credentialsInfo) {
         super(message, credentialsInfo);
         this.state = DEFAULT_STATE;
+        this.providerIdentifier = DEFAULT_PROVIDER_IDENTIFIER;
+        this.queryIdentifier = DEFAULT_QUERY_IDENTIFIER;
         this.expires = DEFAULT_EXPIRES;
     }
 
@@ -128,6 +170,8 @@ protected final long expires;
     public GuacamoleInsufficientCredentialsException(Throwable cause, CredentialsInfo credentialsInfo) {
         super(cause, credentialsInfo);
         this.state = DEFAULT_STATE;
+        this.providerIdentifier = DEFAULT_PROVIDER_IDENTIFIER;
+        this.queryIdentifier = DEFAULT_QUERY_IDENTIFIER;
         this.expires = DEFAULT_EXPIRES;
     }
 
@@ -141,6 +185,27 @@ protected final long expires;
         return state;
     }
 
+    /**
+     * Retrieves the identifier of the authentication provider responsible for this exception.
+     *
+     * @return The identifier of the authentication provider, allowing clients to know
+     *         which provider's process should be resumed in response to this exception.
+     */
+    public String getProviderIdentifier() {
+        return providerIdentifier;
+    }
+
+    /**
+     * Retrieves the specific query identifier associated with the URL for the provider
+     * that can be checked to resume the authentication state.
+     *
+     * @return The query identifier that serves as a reference to a specific point or
+     *         transaction within the provider's authentication process.
+     */
+    public String getQueryIdentifier() {
+        return queryIdentifier;
+    }
+
     /**
      * Retrieves the expiration timestamp of the state token, specified as the
      * number of milliseconds since the UNIX epoch.

guacamole/src/main/java/org/apache/guacamole/rest/auth/AuthenticationService.java

@@ -47,6 +47,7 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import com.google.inject.Singleton;
+import java.util.Iterator;
 
 /**
  * A service for performing authentication checks in REST endpoints.
@@ -325,8 +326,11 @@ public class AuthenticationService {
                     // Store state and expiration
                     String state = e.getState();
                     long expiration = e.getExpires();
+                    String queryIdentifier = e.getQueryIdentifier();
+                    String providerIdentifier = e.getProviderIdentifier();
 
-                    resumableStateMap.put(state, new ResumableAuthenticationState(expiration, credentials));
+                    resumableStateMap.put(state, new ResumableAuthenticationState(providerIdentifier, 
+                            queryIdentifier, expiration, credentials));
 
                     throw new GuacamoleAuthenticationProcessException("User "
                             + "authentication aborted during initial "
@@ -351,6 +355,82 @@ public class AuthenticationService {
 
     }
     
+    /**
+     * Resumes authentication using given credentials if a matching resumable 
+     * state is found.
+     *
+     * @param credentials 
+     *     The initial credentials containing the request object.
+     *
+     * @return 
+     *     Resumed credentials if a valid resumable state is found; otherwise, 
+     *     returns {@code null}.
+     */
+    private Credentials resumeAuthentication(Credentials credentials) {
+        
+        Credentials resumedCredentials = null;
+
+        // Retrieve signed State from the request
+        HttpServletRequest request = credentials.getRequest();
+        
+        // Retrieve the provider id from the query parameters.
+        String resumableProviderId = request.getParameter(Credentials.RESUME_QUERY);
+        // Check if a provider id is set.
+        if (resumableProviderId == null || resumableProviderId.isEmpty()) {
+            // return if a provider id is not set.
+            return null;
+        }
+
+        // Use an iterator to safely remove entries while iterating
+        Iterator<Map.Entry<String, ResumableAuthenticationState>> iterator = resumableStateMap.entrySet().iterator();
+        while (iterator.hasNext()) {
+            Map.Entry<String, ResumableAuthenticationState> entry = iterator.next();
+            ResumableAuthenticationState resumableState = entry.getValue();
+
+            // Check if the provider ID from the request matches the one in the map entry.
+            boolean providerMatches = resumableProviderId.equals(resumableState.getProviderIdentifier());
+            if (!providerMatches) {
+                // If the provider doesn't match, skip to the next entry.
+                continue;
+            }
+
+            // Use the query identifier from the entry to retrieve the corresponding state parameter.
+            String stateQueryParameter = resumableState.getQueryIdentifier();
+            String stateFromParameter = request.getParameter(stateQueryParameter);
+
+            // Check if the `state` parameter is set.
+            if (stateFromParameter == null || stateFromParameter.isEmpty()) {
+                // Remove and continue if `state` is not provided or is empty.
+                iterator.remove(); 
+                continue;
+            }
+
+            // If the key in the entry (state) matches the state parameter provided in the request.
+            if (entry.getKey().equals(stateFromParameter)) {
+
+                // Remove the current entry from the map.
+                iterator.remove();                
+
+                // Check if the resumableState has expired
+                if (!resumableState.isExpired()) {
+
+                    // Set the actualCredentials to the credentials from the matched entry.
+                    resumedCredentials = resumableState.getCredentials();
+
+                    if (resumedCredentials != null) {
+                        resumedCredentials.setRequest(request);
+                    }
+
+                }
+
+                // Exit the loop since we've found the matching state and it's unique.
+                break;
+            }
+        }
+
+        return resumedCredentials;
+    }
+
     /**
      * Authenticates a user using the given credentials and optional
      * authentication token, returning the authentication token associated with
@@ -388,24 +468,11 @@ public class AuthenticationService {
 
         AuthenticatedUser authenticatedUser;
         String authToken;
-        Credentials actualCredentials = credentials;
-        String state;
-        ResumableAuthenticationState resumableState = null;
 
-        // Retrieve signed State from the request
+        // Retrieve credentials if resuming authentication
-        HttpServletRequest request = credentials.getRequest();
+        Credentials actualCredentials = resumeAuthentication(credentials);
-
+        if (actualCredentials == null)
-        // If state is provided, attempt to resume authentication
+            actualCredentials = credentials;
-        if ((state = request.getParameter("state")) != null && (resumableState = resumableStateMap.get(state)) != null) {
-            // The resumableState is removed as it should be a single-use token
-            resumableStateMap.remove(state);
-
-            // Check if the resumableState has expired
-            if (!resumableState.isExpired()) {
-                actualCredentials = resumableState.getCredentials();
-                actualCredentials.setRequest(request);
-            }
-        }
 
         try {
 

guacamole/src/main/java/org/apache/guacamole/rest/auth/ResumableAuthenticationState.java

@@ -39,10 +39,31 @@ public class ResumableAuthenticationState {
      */
     private Credentials credentials;
 
+    /**
+     * A unique string identifying the authentication provider related to the state.
+     * This field allows the client to know which provider's authentication process
+     * should be resumed using this state.
+     */
+    private String providerIdentifier;
+
+    /**
+     * A unique string that can be used to identify a specific query within the
+     * authentication process for the identified provider. This identifier can
+     * help the resumption of an authentication process.
+     */
+    private String queryIdentifier;
+
     /**
      * Constructs a new ResumableAuthenticationState object with the specified
      * expiration timestamp and user credentials.
      *
+     * @param providerIdentifier
+     *     The identifier of the authentication provider to which this resumable state pertains.
+     *
+     * @param queryIdenifier
+     *     The identifier of the specific query within the provider's
+     *     authentication process that this state corresponds to.
+     *
      * @param expirationTimestamp
      *     The timestamp in milliseconds since the Unix epoch when this state
      *     expires and can no longer be used to resume authentication.
@@ -51,9 +72,12 @@ public class ResumableAuthenticationState {
      *     The Credentials object initially submitted by the user and associated
      *     with this resumable state.
      */
-    public ResumableAuthenticationState(long expirationTimestamp, Credentials credentials) {
+    public ResumableAuthenticationState(String providerIdentifier, String queryIdentifier, 
+            long expirationTimestamp, Credentials credentials) {
         this.expirationTimestamp = expirationTimestamp;
         this.credentials = credentials;
+        this.providerIdentifier = providerIdentifier;
+        this.queryIdentifier = queryIdentifier;
     }
 
     /**
@@ -78,4 +102,27 @@ public class ResumableAuthenticationState {
     public Credentials getCredentials() {
         return this.credentials;
     }
+
+    /**
+     * Retrieves the identifier of the authentication provider associated with this state.
+     *
+     * @return 
+     *     The identifier of the authentication provider, providing context for this state
+     *     within the overall authentication sequence.
+     */
+    public String getProviderIdentifier() {
+        return this.providerIdentifier;
+    }
+
+    /**
+     * Retrieves the identifier for a specific query in the authentication
+     * process that is associated with this state.
+     *
+     * @return 
+     *     The query identifier used for retrieving a value representing the state within
+     *     the provider's authentication process that should be resumed.
+     */
+    public String getQueryIdentifier() {
+        return this.queryIdentifier;
+    }
 }