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can ability with nested condition fails if tested against record with nil column #669

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huerlisi opened this Issue Jun 29, 2012 · 13 comments

3 participants

@huerlisi

I've defined an ability like this:

cannot :discount, Offer
can :discount, Offer, :product => {:category => {:product_type => 'text'}}

When testing with can?(:discount, @offer), it fails with can't convert nil into String in cancan (1.6.8) lib/cancan/rule.rb:119:in include?

It works if I change the ability definition to use an array ['text']:

cannot :discount, Offer
can :discount, Offer, :product => {:category => {:product_type => ['text']}}

AFAIK the problem is that the matches_conditions_hash?test in rule.rb looks if the value is an Enumerable. And a String object is an Enumerable. But it's .include? has different semantics than the one for an Array or Hash...

I haven't dig into the cancan code, so I'm not sure, but I guess there should be another check if the value is a String.

Thanks for this nice gem!

@andhapp
Collaborator
andhapp commented Jun 29, 2012

@huerlisi : You only have this issue in 1.6.8? Please confirm.

@huerlisi

Quite sure it hasn't been there on 1.6.7.

@andhapp
Collaborator
andhapp commented Jun 29, 2012

@huerlisi: I can't seem to replicate this issue on my side. Do you want me to push the code that I've got so that you can maybe try to reproduce it in that app. BTW, I am using rails console to test the can? condition.

@andhapp andhapp was assigned Jun 29, 2012
@huerlisi

Sounds good! Beam it over:-)

@andhapp
Collaborator
andhapp commented Jun 29, 2012

Here's the application: https://github.com/andhapp/cancan-ar-test

I've used Company instead of Offer. No idea why I did that but it doesn't really matter. So, a Company HAS Product and Product HAS Category. Here's the quick model definition:

 User (:username, :password)
 Company (:name)
 Product (:name, :company_id) 
 Category (:name, :product_id, :product_type) 

So, do rake migrate and then following in rails console:

These are the steps I took to try and replicate the issue.

1. Create a user
2. ability = Ability.new(user)
3. Create a company, related product and related category
4. ability.can?(:discount, company) # this company is the instance that you've just created.

Please see if you can replicate it. Thanks and sorry about a long comment.

@huerlisi

Hey, great! It's time to go to bed. But I'll try to use this to reproduce tomorrow.

Big thanks for the work you do to reproduce my bug!

@huerlisi

Mmh, didn't make it to bed, yet;-) But as I should, I'm simply dropping a console log of how I was able to reproduce:

Loading development environment (Rails 3.2.6)
irb(main):001:0> User
=> User(id: integer, username: string, password: string, created_at: datetime, updated_at: datetime)
irb(main):002:0> u = User.new
=> #<User id: nil, username: nil, password: nil, created_at: nil, updated_at: nil>
irb(main):003:0> ability = Ability.new(u)
=> #<Ability:0xb6c5590c @rules=[#<CanCan::Rule:0xb6c402dc @conditions={}, @block=nil, @match_all=false, @subjects=[Company(id: integer, name: string, created_at: datetime, updated_at: datetime)], @actions=[:discount], @base_behavior=false>, #<CanCan::Rule:0xb6c40110 @conditions={:product=>{:category=>{:product_type=>"text"}}}, @block=nil, @match_all=false, @subjects=[Company(id: integer, name: string, created_at: datetime, updated_at: datetime)], @actions=[:discount], @base_behavior=true>]>
irb(main):004:0> c = Company.new
=> #<Company id: nil, name: nil, created_at: nil, updated_at: nil>
irb(main):005:0> c.save
   (0.2ms)  begin transaction
  SQL (27.3ms)  INSERT INTO "companies" ("created_at", "name", "updated_at") VALUES (?, ?, ?)  [["created_at", Fri, 29 Jun 2012 21:14:07 UTC +00:00], ["name", nil], ["updated_at", Fri, 29 Jun 2012 21:14:07 UTC +00:00]]
   (142.8ms)  commit transaction
=> true
irb(main):006:0> p = c.build_product
  Product Load (0.2ms)  SELECT "products".* FROM "products" WHERE "products"."company_id" = 1 LIMIT 1
   (0.1ms)  begin transaction
   (0.0ms)  commit transaction
=> #<Product id: nil, name: nil, company_id: 1, created_at: nil, updated_at: nil>
irb(main):007:0> p.name ="Product"
=> "Product"
irb(main):008:0> p.save
   (0.2ms)  begin transaction
  SQL (1.0ms)  INSERT INTO "products" ("company_id", "created_at", "name", "updated_at") VALUES (?, ?, ?, ?)  [["company_id", 1], ["created_at", Fri, 29 Jun 2012 21:14:54 UTC +00:00], ["name", "Product"], ["updated_at", Fri, 29 Jun 2012 21:14:54 UTC +00:00]]
   (162.7ms)  commit transaction
=> true
irb(main):009:0> c.name = "company"
=> "company"
irb(main):010:0> c.save
   (0.2ms)  begin transaction
   (0.6ms)  UPDATE "companies" SET "updated_at" = '2012-06-29 21:15:09.125953', "name" = 'company' WHERE "companies"."id" = 1
   (176.3ms)  commit transaction
=> true
irb(main):011:0> ability.can?(:discount, c)
  Category Load (0.3ms)  SELECT "categories".* FROM "categories" WHERE "categories"."product_id" = 1 LIMIT 1
=> false
irb(main):012:0> cc
NameError: undefined local variable or method `cc' for main:Object
        from (irb):12
irb(main):013:0> c
=> #<Company id: 1, name: "company", created_at: "2012-06-29 21:14:07", updated_at: "2012-06-29 21:15:09">
irb(main):014:0> c.product
=> #<Product id: 1, name: "Product", company_id: 1, created_at: "2012-06-29 21:14:54", updated_at: "2012-06-29 21:14:54">
irb(main):015:0> c.product.category
=> nil
irb(main):016:0> cat = c.product.build_category
   (0.1ms)  begin transaction
   (0.0ms)  commit transaction
=> #<Category id: nil, name: nil, product_id: 1, product_type: nil, created_at: nil, updated_at: nil>
irb(main):017:0> cat.name ="cat"
=> "cat"
irb(main):018:0> cat.save
   (0.2ms)  begin transaction
  SQL (1.0ms)  INSERT INTO "categories" ("created_at", "name", "product_id", "product_type", "updated_at") VALUES (?, ?, ?, ?, ?)  [["created_at", Fri, 29 Jun 2012 21:17:09 UTC +00:00], ["name", "cat"], ["product_id", 1], ["product_type", nil], ["updated_at", Fri, 29 Jun 2012 21:17:09 UTC +00:00]]
   (205.1ms)  commit transaction
=> true
irb(main):019:0> ability.can?(:discount, c)
TypeError: can't convert nil into String
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/rule.rb:119:in `include?'
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/rule.rb:119:in `matches_conditions_hash?'
        from (irb):19:in `all?'
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/rule.rb:107:in `each'
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/rule.rb:107:in `all?'
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/rule.rb:107:in `matches_conditions_hash?'
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/rule.rb:116:in `matches_conditions_hash?'
        from (irb):19:in `all?'
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/rule.rb:107:in `each'
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/rule.rb:107:in `all?'
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/rule.rb:107:in `matches_conditions_hash?'
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/rule.rb:116:in `matches_conditions_hash?'
        from (irb):19:in `all?'
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/rule.rb:107:in `each'
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/rule.rb:107:in `all?'
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/rule.rb:107:in `matches_conditions_hash?'
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/rule.rb:38:in `matches_conditions?'
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/ability.rb:58:in `can?'
        from (irb):19:in `detect'
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/ability.rb:57:in `each'
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/ability.rb:57:in `detect'
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/ability.rb:57:in `can?'
        from (irb):19irb(main):020:0> 
@andhapp
Collaborator
andhapp commented Jun 30, 2012

@huerlisi: Ran the commands in the same order as you and still can't see the issue. Strange. Can you please tell us more about your programming environment? Thanks.

@huerlisi

I'm on ruby 1.8.7. But I had to switch back your code back to hashrockets in some places, so I guess you're running 1.9

@huerlisi

The even bigger (security related) problem is that we might get too many permissions:

If the product_type is a single character that happens to be in the ability string (like 'e' for the requirement 'test'), then access is granted.

If the product_type starts the same string as the ability requirement, but has misses the last few characters (like 'tes' for the requirement 'test'), then access is granted.

Could you test if this is an issue in ruby 1.9, too?

Here's what I've been playing around to validate this. I've missed to save the new value before trying can?, but it should give you an idea on how to reproduce:

Loading development environment (Rails 3.2.6)
irb(main):001:0> c = Company
=> Company(id: integer, name: string, created_at: datetime, updated_at: datetime)
irb(main):002:0> c = Company.first
  Company Load (0.4ms)  SELECT "companies".* FROM "companies" LIMIT 1
=> #<Company id: 1, name: "company", created_at: "2012-06-29 21:14:07", updated_at: "2012-06-29 21:15:09">
irb(main):003:0> can? :discount, company
NameError: undefined local variable or method `company' for main:Object
        from (irb):3
irb(main):004:0> can? :discount, c
NoMethodError: undefined method `can?' for main:Object
        from (irb):4
irb(main):005:0> a = Ability.new(User.first)
  User Load (0.1ms)  SELECT "users".* FROM "users" LIMIT 1
=> #<Ability:0xb6bb2518 @rules=[#<CanCan::Rule:0xb6bb2220 @conditions={}, @block=nil, @match_all=false, @subjects=[Company(id: integer, name: string, created_at: datetime, updated_at: datetime)], @actions=[:discount], @base_behavior=false>, #<CanCan::Rule:0xb6bb20f4 @conditions={:product=>{:category=>{:product_type=>"text"}}}, @block=nil, @match_all=false, @subjects=[Company(id: integer, name: string, created_at: datetime, updated_at: datetime)], @actions=[:discount], @base_behavior=true>]>
irb(main):006:0> can? :discount, c
NoMethodError: undefined method `can?' for main:Object
        from (irb):6
irb(main):007:0> a.can? :discount, c
  Product Load (0.1ms)  SELECT "products".* FROM "products" WHERE "products"."company_id" = 1 LIMIT 1
  Category Load (0.1ms)  SELECT "categories".* FROM "categories" WHERE "categories"."product_id" = 1 LIMIT 1
TypeError: can't convert nil into String
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/rule.rb:119:in `include?'
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/rule.rb:119:in `matches_conditions_hash?'
        from /var/lib/gems/1.8/gems/activesupport-3.2.6/lib/active_support/callbacks.rb:400:in `all?'
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/rule.rb:107:in `each'
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/rule.rb:107:in `all?'
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/rule.rb:107:in `matches_conditions_hash?'
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/rule.rb:116:in `matches_conditions_hash?'
        from /var/lib/gems/1.8/gems/activesupport-3.2.6/lib/active_support/callbacks.rb:400:in `all?'
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/rule.rb:107:in `each'
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/rule.rb:107:in `all?'
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/rule.rb:107:in `matches_conditions_hash?'
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/rule.rb:116:in `matches_conditions_hash?'                                                                                                                             
        from (irb):7:in `all?'                                                                                                                                                                                                    
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/rule.rb:107:in `each'                                                                                                                                                 
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/rule.rb:107:in `all?'                                                                                                                                                 
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/rule.rb:107:in `matches_conditions_hash?'                                                                                                                             
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/rule.rb:38:in `matches_conditions?'                                                                                                                                   
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/ability.rb:58:in `can?'                                                                                                                                               
        from (irb):7:in `detect'                                                                                                                                                                                                  
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/ability.rb:57:in `each'                                                                                                                                               
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/ability.rb:57:in `detect'                                                                                                                                             
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/ability.rb:57:in `can?'                                                                                                                                               
        from (irb):7irb(main):008:0> cat = Category.first                                                                                                                                                                         
  Category Load (0.4ms)  SELECT "categories".* FROM "categories" LIMIT 1                                                                                                                                                          
=> #<Category id: 1, name: "cat", product_id: 1, product_type: nil, created_at: "2012-06-29 21:17:09", updated_at: "2012-06-29 21:17:09">                                                                                         
irb(main):009:0> cat.product_type = "text"                                                                                                                                                                                        
=> "text"                                                                                                                                                                                                                         
irb(main):010:0> cat.save                                                                                                                                                                                                         
   (0.1ms)  begin transaction                                                                                                                                                                                                     
   (0.3ms)  UPDATE "categories" SET "updated_at" = '2012-06-30 06:56:18.595418', "product_type" = 'text' WHERE "categories"."id" = 1                                                                                              
   (170.5ms)  commit transaction                                                                                                                                                                                                  
=> true                                                                                                                                                                                                                           
irb(main):011:0> a.can? :discount, c                                                                                                                                                                                        
TypeError: can't convert nil into String                                                                                                                                                                                          
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/rule.rb:119:in `include?'                                                                                                                                             
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/rule.rb:119:in `matches_conditions_hash?'                                                                                                                             
        from (irb):11:in `all?'                                                                                                                                                                                                   
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/rule.rb:107:in `each'                                                                                                                                                 
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/rule.rb:107:in `all?'
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/rule.rb:107:in `matches_conditions_hash?'
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/rule.rb:116:in `matches_conditions_hash?'
        from (irb):11:in `all?'
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/rule.rb:107:in `each'
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/rule.rb:107:in `all?'
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/rule.rb:107:in `matches_conditions_hash?'
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/rule.rb:116:in `matches_conditions_hash?'
        from (irb):11:in `all?'
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/rule.rb:107:in `each'
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/rule.rb:107:in `all?'
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/rule.rb:107:in `matches_conditions_hash?'
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/rule.rb:38:in `matches_conditions?'
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/ability.rb:58:in `can?'
        from (irb):11:in `detect'
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/ability.rb:57:in `each'
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/ability.rb:57:in `detect'
        from /var/lib/gems/1.8/gems/cancan-1.6.8/lib/cancan/ability.rb:57:in `can?'
        from (irbc
=> #<Company id: 1, name: "company", created_at: "2012-06-29 21:14:07", updated_at: "2012-06-29 21:15:09">
irb(main):013:0> c.products
NoMethodError: undefined method `products' for #<Company:0xb6bd3290>
        from /var/lib/gems/1.8/gems/activemodel-3.2.6/lib/active_model/attribute_methods.rb:407:in `method_missing'
        from /var/lib/gems/1.8/gems/activerecord-3.2.6/lib/active_record/attribute_methods.rb:149:in `method_missing'
        from (irb):13
irb(main):014:0> c.product
=> #<Product id: 1, name: "Product", company_id: 1, created_at: "2012-06-29 21:14:54", updated_at: "2012-06-29 21:14:54">
irb(main):015:0> c.product.category
=> #<Category id: 1, name: "cat", product_id: 1, product_type: nil, created_at: "2012-06-29 21:17:09", updated_at: "2012-06-29 21:17:09">
irb(main):016:0> c.product.category(true)
  Category Load (0.5ms)  SELECT "categories".* FROM "categories" WHERE "categories"."product_id" = 1 LIMIT 1
=> #<Category id: 1, name: "cat", product_id: 1, product_type: "text", created_at: "2012-06-29 21:17:09", updated_at: "2012-06-30 06:56:18">
irb(main):017:0> c.product.category
=> #<Category id: 1, name: "cat", product_id: 1, product_type: "text", created_at: "2012-06-29 21:17:09", updated_at: "2012-06-30 06:56:18">
irb(main):018:0> a.can? :discount, c
=> true
irb(main):019:0> cat = c.product.category
=> #<Category id: 1, name: "cat", product_id: 1, product_type: "text", created_at: "2012-06-29 21:17:09", updated_at: "2012-06-30 06:56:18">
irb(main):020:0> cat.product_type = "t"
=> "t"
irb(main):021:0> cat.save
   (0.1ms)  begin transaction
   (0.5ms)  UPDATE "categories" SET "updated_at" = '2012-06-30 06:58:13.048588', "product_type" = 't' WHERE "categories"."id" = 1
   (138.0ms)  commit transaction
=> true
irb(main):022:0> c.product.category
=> #<Category id: 1, name: "cat", product_id: 1, product_type: "t", created_at: "2012-06-29 21:17:09", updated_at: "2012-06-30 06:58:13">
irb(main):023:0> a.can? :discount, c
=> true
irb(main):024:0> cat.product_type = "q"
=> "q"
irb(main):025:0> cat.save
   (0.2ms)  begin transaction
   (0.6ms)  UPDATE "categories" SET "updated_at" = '2012-06-30 06:58:32.321343', "product_type" = 'q' WHERE "categories"."id" = 1
   (168.6ms)  commit transaction
=> true
irb(main):026:0> a.can? :discount, c
=> false
irb(main):027:0> cat.product_type = "tte"
=> "tte"
irb(main):028:0> cat.save
   (0.2ms)  begin transaction
   (0.5ms)  UPDATE "categories" SET "updated_at" = '2012-06-30 07:01:06.162166', "product_type" = 'tte' WHERE "categories"."id" = 1
   (157.4ms)  commit transaction
=> true
irb(main):029:0> a.can? :discount, c
=> false
irb(main):030:0> cat.product_type = "tes"
=> "tes"
irb(main):031:0> a.can? :discount, c
=> false
irb(main):032:0> cat.save
   (0.1ms)  begin transaction
   (1.6ms)  UPDATE "categories" SET "updated_at" = '2012-06-30 07:01:20.489774', "product_type" = 'tes' WHERE "categories"."id" = 1
   (161.5ms)  commit transaction
=> true
irb(main):033:0> a.can? :discount, c
=> false
irb(main):034:0> cat.product_type = "t"
=> "t"
irb(main):035:0> cat.save
   (0.2ms)  begin transaction
   (0.5ms)  UPDATE "categories" SET "updated_at" = '2012-06-30 07:01:30.006224', "product_type" = 't' WHERE "categories"."id" = 1
   (163.3ms)  commit transaction
=> true
irb(main):036:0> a.can? :discount, c
=> true
irb(main):037:0> cat.product_type = "e"
=> "e"
irb(main):038:0> cat.save
   (0.2ms)  begin transaction
   (0.5ms)  UPDATE "categories" SET "updated_at" = '2012-06-30 07:01:45.592972', "product_type" = 'e' WHERE "categories"."id" = 1
   (140.3ms)  commit transaction
=> true
irb(main):039:0> a.can? :discount, c
=> true
irb(main):040:0> cat.product_type = "te"
=> "te"
irb(main):041:0> cat.save
   (0.2ms)  begin transaction
   (0.5ms)  UPDATE "categories" SET "updated_at" = '2012-06-30 07:01:53.580547', "product_type" = 'te' WHERE "categories"."id" = 1
   (122.4ms)  commit transaction
=> true
irb(main):042:0> a.can? :discount, c
=> true
irb(main):043:0> cat.product_type = "tet"
=> "tet"
irb(main):044:0> a.can? :discount, c
=> false
irb(main):045:0> cat.save
   (0.2ms)  begin transaction
   (0.5ms)  UPDATE "categories" SET "updated_at" = '2012-06-30 07:02:07.779261', "product_type" = 'tet' WHERE "categories"."id" = 1
   (153.4ms)  commit transaction
=> true
irb(main):046:0> a.can? :discount, c
=> false
irb(main):047:0> cat.product_type = "est"
=> "est"
irb(main):048:0> cat.save
   (0.2ms)  begin transaction
   (0.5ms)  UPDATE "categories" SET "updated_at" = '2012-06-30 07:02:29.566954', "product_type" = 'est' WHERE "categories"."id" = 1
   (188.0ms)  commit transaction
=> true
irb(main):049:0> a.can? :discount, c
=> false

@andhapp
Collaborator
andhapp commented Jun 30, 2012

@huerlisi : That's a truly long comment :smirk:. Thanks. I think this needs a little more investigation. Will post any findings here.

@andhapp
Collaborator
andhapp commented Jul 3, 2012

@huerlisi: I did look through this again and I still can't reproduce the errors. I also tried to replicate the issue related to "extra permissions" and couldn't reproduce it either.

What version of rails, ruby are you using? Not sure if it's going to make a huge difference but worth a try.

Also, for next time use a gist to post long code snippets. Thanks.

@xhoy
xhoy commented Jul 1, 2014

Thanks for your submission! The ryanb/cancan repository has been inactive since Sep 06, 2013.
Since only Ryan himself has commit permissions, the CanCan project is on a standstill.

CanCan has many open issues, including missing support for Rails 4. To keep CanCan alive, an active fork exists at cancancommunity/cancancan. The new gem is cancancan. More info is available at #994.

If your pull request or issue is still applicable, it would be really appreciated if you resubmit it to CanCanCan.

We hope to see you on the other side!

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