How does authorization work in Mongo?

Question

MongoDB

Hello.
The server has mongo version 2.4.9 installed.
By default, the auth=true line in the config is commented out.
Users created in mongo:

> use admin
switched to db admin
> show users
{
  "_id" : ObjectId("55631c4ced1bdfc880fda8e0"),
  "user" : "admin",
  "pwd" : "f306c561a12b1be8478e4cc3b460433a",
  "roles" : [
    "userAdminAnyDatabase",
    "dbAdminAnyDatabase",
    "readWriteAnyDatabase"
  ]
}
{
  "_id" : ObjectId("5563371cb7537b3e14bdfb4b"),
  "user" : "rUser",
  "pwd" : "eee18df57c91293310dbf78649955a84",
  "roles" : [
    "readAnyDatabase"
  ]
}

When I remove the hash mark from the "#auth=true" line in the config and "auth=true" remains, then when I call the "mongo" command, I enter the mongo console, but I don't see the database by itself (I get an error on the "show dbs" command " ...listDatabases failed:{ "ok" : 0, "errmsg" : "unauthorized" }...").
But why does this error occur:

> use admin
switched to db admin
> db.auth('admin', 'password')
1
> show dbs
Tue May 26 19:48:05.074 listDatabases failed:{ "ok" : 0, "errmsg" : "unauthorized" } at src/mongo/shell/mongo.js:46

Answer 1

Works for me:
Started the server:
I add a user:

$ mongo --port 27020
MongoDB shell version: 2.6.10
connecting to: 127.0.0.1:27020/test
> show dbs
admin  (empty)
local  0.031GB
> use admin
switched to db admin
> db.addUser({user:'name', pwd:'password', roles:["userAdminAnyDatabase","dbAdminAnyDatabase", "readWriteAnyDatabase"]})
WARNING: The 'addUser' shell helper is DEPRECATED. Please use 'createUser' instead
Successfully added user: {
        "user" : "name",
        "roles" : [
                "userAdminAnyDatabase",
                "dbAdminAnyDatabase",
                "readWriteAnyDatabase"
        ]
}
> exit
bye

Checking:

$ mongo --port 27020
MongoDB shell version: 2.6.10
connecting to: 127.0.0.1:27020/test
> show dbs
2015-05-27T16:35:46.071+0500 listDatabases failed:{
        "ok" : 0,
        "errmsg" : "not authorized on admin to execute command { listDatabases: 1.0 }",
        "code" : 13
} at src/mongo/shell/mongo.js:47
> use admin
switched to db admin
> db.auth('name', 'password')
1
> show dbs
admin  0.031GB
local  0.031GB

Those. at connection there are no rights before authorization.
Alternatively, you can try updating to 2.6, there are not many changes.