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336 lines
12 KiB
Python
336 lines
12 KiB
Python
#!/usr/bin/python
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# (c) 2012, Mark Theunissen <mark.theunissen@gmail.com>
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# Sponsored by Four Kitchens http://fourkitchens.com.
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#
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# This file is part of Ansible
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#
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# Ansible is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# Ansible is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Ansible. If not, see <http://www.gnu.org/licenses/>.
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DOCUMENTATION = '''
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---
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module: mysql_user
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short_description: Adds or removes a user from a MySQL database.
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description:
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- Adds or removes a user from a MySQL database.
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version_added: "0.6"
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options:
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name:
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description:
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- name of the user (role) to add or remove
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required: true
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default: null
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password:
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description:
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- set the user's password
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required: false
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default: null
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host:
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description:
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- the 'host' part of the MySQL username
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required: false
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default: localhost
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login_user:
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description:
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- The username used to authenticate with
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required: false
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default: null
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login_password:
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description:
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- The password used to authenticate with
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required: false
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default: null
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login_host:
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description:
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- Host running the database
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required: false
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default: localhost
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priv:
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description:
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- "MySQL privileges string in the format: C(db.table:priv1,priv2)"
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required: false
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default: null
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state:
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description:
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- The database state
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required: false
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default: present
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choices: [ "present", "absent" ]
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examples:
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- code: "mysql_user: name=bob password=12345 priv=*.*:ALL state=present"
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description: Create database user with name 'bob' and password '12345' with all database privileges
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- code: "mysql_user: login_user=root login_password=123456 name=sally state=absent"
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description: Ensure no user named 'sally' exists, also passing in the auth credentials.
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- code: mydb.*:INSERT,UPDATE/anotherdb.*:SELECT/yetanotherdb.*:ALL
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description: Example privileges string format
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notes:
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- Requires the MySQLdb Python package on the remote host. For Ubuntu, this
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is as easy as apt-get install python-mysqldb.
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- Both C(login_password) and C(login_username) are required when you are
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passing credentials. If none are present, the module will attempt to read
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the credentials from C(~/.my.cnf), and finally fall back to using the MySQL
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default login of 'root' with no password.
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- MySQL server installs with default login_user of 'root' and no password. To secure this user
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as part of an idempotent playbook, you must create at least two tasks: the first must change the root user's password,
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without providing any login_user/login_password details. The second must drop a ~/.my.cnf file containing
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the new root credentials. Subsequent runs of the playbook will then succeed by reading the new credentials from
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the file.
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requirements: [ "ConfigParser", "MySQLdb" ]
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author: Mark Theunissen
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'''
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import ConfigParser
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try:
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import MySQLdb
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except ImportError:
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mysqldb_found = False
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else:
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mysqldb_found = True
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# ===========================================
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# MySQL module specific support methods.
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#
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def user_exists(cursor, user, host):
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cursor.execute("SELECT count(*) FROM user WHERE user = %s AND host = %s", (user,host))
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count = cursor.fetchone()
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return count[0] > 0
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def user_add(cursor, user, host, password, new_priv):
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cursor.execute("CREATE USER %s@%s IDENTIFIED BY %s", (user,host,password))
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if new_priv is not None:
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for db_table, priv in new_priv.iteritems():
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privileges_grant(cursor, user,host,db_table,priv)
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return True
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def user_mod(cursor, user, host, password, new_priv):
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changed = False
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# Handle passwords.
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if password is not None:
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cursor.execute("SELECT password FROM user WHERE user = %s AND host = %s", (user,host))
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current_pass_hash = cursor.fetchone()
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cursor.execute("SELECT PASSWORD(%s)", (password,))
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new_pass_hash = cursor.fetchone()
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if current_pass_hash[0] != new_pass_hash[0]:
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cursor.execute("SET PASSWORD FOR %s@%s = PASSWORD(%s)", (user,host,password))
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changed = True
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# Handle privileges.
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if new_priv is not None:
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curr_priv = privileges_get(cursor, user,host)
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# If the user has privileges on a db.table that doesn't appear at all in
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# the new specification, then revoke all privileges on it.
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for db_table, priv in curr_priv.iteritems():
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if db_table not in new_priv:
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privileges_revoke(cursor, user,host,db_table)
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changed = True
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# If the user doesn't currently have any privileges on a db.table, then
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# we can perform a straight grant operation.
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for db_table, priv in new_priv.iteritems():
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if db_table not in curr_priv:
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privileges_grant(cursor, user,host,db_table,priv)
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changed = True
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# If the db.table specification exists in both the user's current privileges
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# and in the new privileges, then we need to see if there's a difference.
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db_table_intersect = set(new_priv.keys()) & set(curr_priv.keys())
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for db_table in db_table_intersect:
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priv_diff = set(new_priv[db_table]) ^ set(curr_priv[db_table])
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if (len(priv_diff) > 0):
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privileges_revoke(cursor, user,host,db_table)
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privileges_grant(cursor, user,host,db_table,new_priv[db_table])
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changed = True
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return changed
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def user_delete(cursor, user, host):
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cursor.execute("DROP USER %s@%s", (user,host))
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return True
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def privileges_get(cursor, user,host):
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""" MySQL doesn't have a better method of getting privileges aside from the
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SHOW GRANTS query syntax, which requires us to then parse the returned string.
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Here's an example of the string that is returned from MySQL:
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GRANT USAGE ON *.* TO 'user'@'localhost' IDENTIFIED BY 'pass';
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This function makes the query and returns a dictionary containing the results.
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The dictionary format is the same as that returned by privileges_unpack() below.
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"""
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output = {}
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cursor.execute("SHOW GRANTS FOR %s@%s", (user,host))
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grants = cursor.fetchall()
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def pick(x):
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if x == 'ALL PRIVILEGES':
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return 'ALL'
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else:
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return x
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for grant in grants:
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res = re.match("GRANT (.+) ON (.+) TO '.+'@'.+'( IDENTIFIED BY PASSWORD '.+')? ?(.*)", grant[0])
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if res is None:
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module.fail_json(msg="unable to parse the MySQL grant string")
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privileges = res.group(1).split(", ")
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privileges = [ pick(x) for x in privileges]
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if "WITH GRANT OPTION" in res.group(4):
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privileges.append('GRANT')
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db = res.group(2).replace('`', '')
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output[db] = privileges
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return output
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def privileges_unpack(priv):
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""" Take a privileges string, typically passed as a parameter, and unserialize
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it into a dictionary, the same format as privileges_get() above. We have this
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custom format to avoid using YAML/JSON strings inside YAML playbooks. Example
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of a privileges string:
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mydb.*:INSERT,UPDATE/anotherdb.*:SELECT/yetanother.*:ALL
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The privilege USAGE stands for no privileges, so we add that in on *.* if it's
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not specified in the string, as MySQL will always provide this by default.
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"""
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output = {}
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for item in priv.split('/'):
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pieces = item.split(':')
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output[pieces[0]] = pieces[1].upper().split(',')
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if '*.*' not in output:
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output['*.*'] = ['USAGE']
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return output
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def privileges_revoke(cursor, user,host,db_table):
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query = "REVOKE ALL PRIVILEGES ON %s FROM '%s'@'%s'" % (db_table,user,host)
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cursor.execute(query)
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query = "REVOKE GRANT OPTION ON %s FROM '%s'@'%s'" % (db_table,user,host)
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try:
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cursor.execute(query)
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except MySQLdb.OperationalError, e:
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# 1141 -> There is no such grant defined for user ... on host ...
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# If this exception is raised, there is no need to revoke the GRANT privilege
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if e.args[0] != 1141 or not e.args[1].startswith("There is no such grant defined for user"):
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raise e
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def privileges_grant(cursor, user,host,db_table,priv):
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priv_string = ",".join(filter(lambda x: x != 'GRANT', priv))
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query = "GRANT %s ON %s TO '%s'@'%s'" % (priv_string,db_table,user,host)
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if 'GRANT' in priv:
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query = query + " WITH GRANT OPTION"
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cursor.execute(query)
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def load_mycnf():
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config = ConfigParser.RawConfigParser()
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mycnf = os.path.expanduser('~/.my.cnf')
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if not os.path.exists(mycnf):
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return False
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try:
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config.readfp(open(mycnf))
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except (IOError):
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return False
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# We support two forms of passwords in .my.cnf, both pass= and password=,
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# as these are both supported by MySQL.
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try:
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passwd = config.get('client', 'password')
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except (ConfigParser.NoOptionError):
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try:
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passwd = config.get('client', 'pass')
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except (ConfigParser.NoOptionError):
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return False
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try:
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creds = dict(user=config.get('client', 'user'),passwd=passwd)
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except (ConfigParser.NoOptionError):
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return False
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return creds
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# ===========================================
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# Module execution.
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#
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def main():
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module = AnsibleModule(
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argument_spec = dict(
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login_user=dict(default=None),
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login_password=dict(default=None),
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login_host=dict(default="localhost"),
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login_unix_socket=dict(default=None),
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user=dict(required=True, aliases=['name']),
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password=dict(default=None),
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host=dict(default="localhost"),
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state=dict(default="present", choices=["absent", "present"]),
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priv=dict(default=None),
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)
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)
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user = module.params["user"]
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password = module.params["password"]
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host = module.params["host"]
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state = module.params["state"]
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priv = module.params["priv"]
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if not mysqldb_found:
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module.fail_json(msg="the python mysqldb module is required")
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if priv is not None:
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try:
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priv = privileges_unpack(priv)
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except:
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module.fail_json(msg="invalid privileges string")
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# Either the caller passes both a username and password with which to connect to
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# mysql, or they pass neither and allow this module to read the credentials from
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# ~/.my.cnf.
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login_password = module.params["login_password"]
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login_user = module.params["login_user"]
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if login_user is None and login_password is None:
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mycnf_creds = load_mycnf()
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if mycnf_creds is False:
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login_user = "root"
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login_password = ""
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else:
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login_user = mycnf_creds["user"]
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login_password = mycnf_creds["passwd"]
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elif login_password is None or login_user is None:
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module.fail_json(msg="when supplying login arguments, both login_user and login_password must be provided")
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try:
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if module.params["login_unix_socket"]:
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db_connection = MySQLdb.connect(host=module.params["login_host"], unix_socket=module.params["login_unix_socket"], user=login_user, passwd=login_password, db="mysql")
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else:
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db_connection = MySQLdb.connect(host=module.params["login_host"], user=login_user, passwd=login_password, db="mysql")
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cursor = db_connection.cursor()
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except Exception, e:
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module.fail_json(msg="unable to connect to database, check login_user and login_password are correct or ~/.my.cnf has the credentials")
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if state == "present":
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if user_exists(cursor, user, host):
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changed = user_mod(cursor, user, host, password, priv)
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else:
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if password is None:
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module.fail_json(msg="password parameter required when adding a user")
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changed = user_add(cursor, user, host, password, priv)
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elif state == "absent":
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if user_exists(cursor, user, host):
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changed = user_delete(cursor, user, host)
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else:
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changed = False
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module.exit_json(changed=changed, user=user)
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# this is magic, see lib/ansible/module_common.py
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#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
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main()
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