password_hash - fix bcrypt algorithm when passlib is not installed (#81385) (#81425)

(cherry picked from commit f5431321a2)

changelogs/fragments/password_hash-fix-crypt-salt-bcrypt.yml

@@ -0,0 +1,2 @@
+bugfixes:
+  - password_hash - fix salt format for ``crypt``  (only used if ``passlib`` is not installed) for the ``bcrypt`` algorithm.

lib/ansible/utils/encrypt.py

@@ -128,7 +128,10 @@ class CryptHash(BaseHash):
         return ret
 
     def _rounds(self, rounds):
-        if rounds == self.algo_data.implicit_rounds:
+        if self.algorithm == 'bcrypt':
+            # crypt requires 2 digits for rounds
+            return rounds or self.algo_data.implicit_rounds
+        elif rounds == self.algo_data.implicit_rounds:
             # Passlib does not include the rounds if it is the same as implicit_rounds.
             # Make crypt lib behave the same, by not explicitly specifying the rounds in that case.
             return None
@@ -148,6 +151,9 @@ class CryptHash(BaseHash):
             saltstring = "$%s" % ident
 
         if rounds:
+            if self.algorithm == 'bcrypt':
+                saltstring += "$%d" % rounds
+            else:
                 saltstring += "$rounds=%d" % rounds
 
         saltstring += "$%s" % salt
@@ -178,6 +184,7 @@ class PasslibHash(BaseHash):
 
         if not PASSLIB_AVAILABLE:
             raise AnsibleError("passlib must be installed and usable to hash with '%s'" % algorithm, orig_exc=PASSLIB_E)
+        display.vv("Using passlib to hash input with '%s'" % algorithm)
 
         try:
             self.crypt_algo = getattr(passlib.hash, algorithm)

test/integration/targets/filter_core/tasks/main.yml

@@ -478,6 +478,14 @@
   vars:
     msg: "msdcc is not in the list of supported passlib algorithms: md5, blowfish, sha256, sha512"
 
+- name: test password_hash can work with bcrypt without passlib installed
+  debug:
+    msg: "{{ 'somestring'|password_hash('bcrypt') }}"
+  register: crypt_bcrypt
+  # Some implementations of crypt do not fail outright and return some short value.
+  failed_when: crypt_bcrypt is failed or (crypt_bcrypt.msg|length|int) != 60
+  when: ansible_facts.os_family in ['RedHat', 'Debian']
+
 - name: Verify to_uuid throws on weird namespace
   set_fact:
     foo: '{{"hey"|to_uuid(namespace=22)}}'