[Rails] Re: One database and several users with different access rights
On Tuesday, 11 July 2017 23:39:13 UTC-4, Ralph Shnelvar wrote: > > I have a database with a large table. > > I have several users each of whom should have read-only rights to the > large table but has read/wrtie rights to their own table(s) but not to each > others table(s). > > Adding to the complication, I want to give each RoR user the ability to > write their own SQL statements against the large table as well as their own > table(s). I have successfully implemented being able to have them enter > sql statements and create results they can view and/or download. Doing > that is not my question. > > I want to make sure each of my "readonly" users can't modify any tables > they are not authorized to see and/or change. > > So,I guess, I want to change Postgres roles within Rails. Any guidance > would, of course, be appreciated. > I've never used it, but something like "SET SESSION AUTHORIZATION" looks like it would do what you want, mostly: https://www.postgresql.org/docs/current/static/sql-set-session-authorization.html You'd set up a "superuser" in config/database.yml and then change to the lower-privileged specific user per-request. Some potential problems: * the lower-privileged users *must* not have sufficient permissions to call "SET SESSION AUTHORIZATION" themselves or the security is an illusion * you'll want to make 100% certain that connections get a "RESET SESSION AUTHORIZATION", or a selected user's authorization will leak into the next request (and fail, see the previous point) * you'll need to somehow sanitize the incoming SQL to remove queries like "RESET SESSION AUTHORIZATION; DROP TABLE all_the_things" or the security is an illusion I noticed you mentioned "their own tables" above; if you're already committed to solutions where adding users is complex, you might want to think about separating things further. You could use a tool like pglogical: https://www.2ndquadrant.com/en/resources/pglogical/ To replicate only the large table to per-user Postgres DBs. Definitely NOT an appropriate solution for multi-tenancy with lots of users, but neither is table-per-user. --Matt Jones -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To unsubscribe from this group and stop receiving emails from it, send an email to rubyonrails-talk+unsubscr...@googlegroups.com. To post to this group, send email to rubyonrails-talk@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/rubyonrails-talk/af2f5066-1ac6-4971-98e8-2acbfeb0be31%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [Rails] Re: One database and several users with different access rights
On 12 July 2017 at 15:13, Ralph Shnelvar wrote: > What's the convention here: top posting or bottom posting? Whatever is appropriate for the message at hand. When making a number of points wrt previous post then obviously inline posting is preferable. Well it's obvious to me anyway. Colin > > Ralph > > > On Wednesday, July 12, 2017 at 7:52:06 AM UTC-6, Hassan Schroeder wrote: >> >> On Wed, Jul 12, 2017 at 6:33 AM, Ralph Shnelvar wrote: >> >> > I _think_ I need to do something like "sudo -i -u >> > SomeOtherPostgresUserName" >> > but I want to do it inside Rails so I can connect to databases as user >> > SomeOtherPostgresUserName. >> >> I would look at >> >> ActiveRecord::Base.establish_connection() >> >> which accepts either an atom representing an entry in your >> config/database.yml or a hash with DB login credentials. >> >> Aside: >> >> > class RalphSql >> > def self.exec_sql(sql_text) >> > begin >> > # Return an array of records >> > return ActiveRecord::Base.connection.execute(sql_text) >> >> I hope you really really REALLY trust the input from your users >> and do very frequent backups :-) >> >> HTH! >> -- >> Hassan Schroeder hassan.s...@gmail.com >> twitter: @hassan >> Consulting Availability : Silicon Valley or remote > > -- > You received this message because you are subscribed to the Google Groups > "Ruby on Rails: Talk" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to rubyonrails-talk+unsubscr...@googlegroups.com. > To post to this group, send email to rubyonrails-talk@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/rubyonrails-talk/a2db5d66-4ff1-4eb1-ba42-8ebf11954004%40googlegroups.com. > > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To unsubscribe from this group and stop receiving emails from it, send an email to rubyonrails-talk+unsubscr...@googlegroups.com. To post to this group, send email to rubyonrails-talk@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/rubyonrails-talk/CAL%3D0gLttndt3DFhL9fBtwXXzx-9PsXQwBgLepEiGCffEgQPEyA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
Re: [Rails] Re: One database and several users with different access rights
What's the convention here: top posting or bottom posting? Ralph On Wednesday, July 12, 2017 at 7:52:06 AM UTC-6, Hassan Schroeder wrote: > > On Wed, Jul 12, 2017 at 6:33 AM, Ralph Shnelvar > wrote: > > > I _think_ I need to do something like "sudo -i -u > SomeOtherPostgresUserName" > > but I want to do it inside Rails so I can connect to databases as user > > SomeOtherPostgresUserName. > > I would look at > > ActiveRecord::Base.establish_connection() > > which accepts either an atom representing an entry in your > config/database.yml or a hash with DB login credentials. > > Aside: > > > class RalphSql > > def self.exec_sql(sql_text) > > begin > > # Return an array of records > > return ActiveRecord::Base.connection.execute(sql_text) > > I hope you really really REALLY trust the input from your users > and do very frequent backups :-) > > HTH! > -- > Hassan Schroeder hassan.s...@gmail.com > > twitter: @hassan > Consulting Availability : Silicon Valley or remote > -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To unsubscribe from this group and stop receiving emails from it, send an email to rubyonrails-talk+unsubscr...@googlegroups.com. To post to this group, send email to rubyonrails-talk@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/rubyonrails-talk/a2db5d66-4ff1-4eb1-ba42-8ebf11954004%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [Rails] Re: One database and several users with different access rights
On Wed, Jul 12, 2017 at 6:33 AM, Ralph Shnelvar wrote: > I _think_ I need to do something like "sudo -i -u SomeOtherPostgresUserName" > but I want to do it inside Rails so I can connect to databases as user > SomeOtherPostgresUserName. I would look at ActiveRecord::Base.establish_connection() which accepts either an atom representing an entry in your config/database.yml or a hash with DB login credentials. Aside: > class RalphSql > def self.exec_sql(sql_text) > begin > # Return an array of records > return ActiveRecord::Base.connection.execute(sql_text) I hope you really really REALLY trust the input from your users and do very frequent backups :-) HTH! -- Hassan Schroeder hassan.schroe...@gmail.com twitter: @hassan Consulting Availability : Silicon Valley or remote -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To unsubscribe from this group and stop receiving emails from it, send an email to rubyonrails-talk+unsubscr...@googlegroups.com. To post to this group, send email to rubyonrails-talk@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/rubyonrails-talk/CACmC4yAVE1xS9wrdULocr-aebsGqEqq_-nqXzQ_eY7s0aEsbAw%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
[Rails] Re: One database and several users with different access rights
David,
I looked through your code and I'm not sure you have answered my question.
Let me try to clarify. There is a difference between a Devise role and a
Postgres role. A devise role will control access to Rails functionality.
For example, one can restrict access to a Rails controller method using
Devise.
A Postgres role (
https://www.postgresql.org/docs/current/static/database-roles.html ) is a
completely different animal. I quote and modify what is written there:
> Database roles are conceptually completely separate from operating system
> [and Devise!] users.
I _think_ I need to do something like "sudo -i -u
SomeOtherPostgresUserName" but I want to do it inside Rails so I can
connect to databases as user SomeOtherPostgresUserName.
Can you share how you did the "give each RoR user the ability to write
> their own SQL statements "? I may want to do the same.
Here is the code I use. RalphSql.exec_sql is what you want.
RalphSql.get_column_names_from_table is a function I find useful for other
obvious purposes.
class RalphSql
def self.exec_sql(sql_text)
begin
# Return an array of records
return ActiveRecord::Base.connection.execute(sql_text)
rescue Exception => e
byebug if ralph_test_byebug
raise e
end
end
# See http://www.rubydoc.info/gems/pg/PG/Result
def self.get_column_names_from_table(postgres_table_name)
sql = %Q[SELECT column_name FROM information_schema.columns WHERE
table_name = '#{postgres_table_name}';]
# byebug if ralph_test_byebug
pg_result = RalphSql.exec_sql(sql) # pg_result.class == PG::Result
ret = pg_result.values
# byebug if ralph_test_byebug
ret
end
end
I use devise and cancancan for login and roles.
I use pundit
On Wednesday, July 12, 2017 at 4:51:32 AM UTC-6, David Gleba wrote:
>
>
> I use devise and cancancan for login and roles.
>
> In my little rails app generator project:
> https://github.com/dgleba/bashrail there are scripts for this. Even if
> you don't use the scripts, they document exactly how to implement it in
> that case.
>
> look at:
> https://github.com/dgleba/bashrail/blob/master/devise1.sh
> https://github.com/dgleba/bashrail/blob/master/cancan1.sh
>
> When I am learning something like this I strip the scripts down to just
> what is needed to create an app with the feature I am studing.
>
> I am not sure about the "give each RoR user the ability to write their
> own SQL statements ".
> Is that just a model/view/controller in your app? If so, the above should
> work for that too.
>
> Can you share how you did the "give each RoR user the ability to write
> their own SQL statements "? I may want to do the same.
>
>
>
> On Tuesday, July 11, 2017 at 11:39:13 PM UTC-4, Ralph Shnelvar wrote:
>>
>> I have a database with a large table.
>>
>> I have several users each of whom should have read-only rights to the
>> large table but has read/wrtie rights to their own table(s) but not to each
>> others table(s).
>>
>> Adding to the complication, I want to give each RoR user the ability to
>> write their own SQL statements against the large table as well as their own
>> table(s). I have successfully implemented being able to have them enter
>> sql statements and create results they can view and/or download. Doing
>> that is not my question.
>>
>> I want to make sure each of my "readonly" users can't modify any tables
>> they are not authorized to see and/or change.
>>
>> So,I guess, I want to change Postgres roles within Rails. Any guidance
>> would, of course, be appreciated.
>>
>>
>>
--
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[Rails] Re: One database and several users with different access rights
I use devise and cancancan for login and roles. In my little rails app generator project: https://github.com/dgleba/bashrail there are scripts for this. Even if you don't use the scripts, they document exactly how to implement it in that case. look at: https://github.com/dgleba/bashrail/blob/master/devise1.sh https://github.com/dgleba/bashrail/blob/master/cancan1.sh When I am learning something like this I strip the scripts down to just what is needed to create an app with the feature I am studing. I am not sure about the "give each RoR user the ability to write their own SQL statements ". Is that just a model/view/controller in your app? If so, the above should work for that too. Can you share how you did the "give each RoR user the ability to write their own SQL statements "? I may want to do the same. On Tuesday, July 11, 2017 at 11:39:13 PM UTC-4, Ralph Shnelvar wrote: > > I have a database with a large table. > > I have several users each of whom should have read-only rights to the > large table but has read/wrtie rights to their own table(s) but not to each > others table(s). > > Adding to the complication, I want to give each RoR user the ability to > write their own SQL statements against the large table as well as their own > table(s). I have successfully implemented being able to have them enter > sql statements and create results they can view and/or download. Doing > that is not my question. > > I want to make sure each of my "readonly" users can't modify any tables > they are not authorized to see and/or change. > > So,I guess, I want to change Postgres roles within Rails. Any guidance > would, of course, be appreciated. > > > -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To unsubscribe from this group and stop receiving emails from it, send an email to rubyonrails-talk+unsubscr...@googlegroups.com. To post to this group, send email to rubyonrails-talk@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/rubyonrails-talk/d00f4681-e13c-4d0f-af07-bc4835467849%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
