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fix: handle encoding errors in mysql obfuscation #160

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Merged
robertlaurin merged 4 commits into from
Oct 26, 2022
Merged

fix: handle encoding errors in mysql obfuscation #160

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cbcad76
fix: handle encoding errors in mysql obfuscation
robertlaurin Oct 24, 2022
bab4c08
fix: db name extraction failures
robertlaurin Oct 25, 2022
6df0122
fix: handle binary encoding
robertlaurin Oct 25, 2022
007b657
Merge branch 'main' into fix-obfuscation-encoding-error
robertlaurin Oct 25, 2022
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fix: handle encoding errors in mysql obfuscation
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@robertlaurin
robertlaurin committed Oct 24, 2022
commit cbcad7656e7552ad00d479ce76e37d801e170a7f
7 changes: 5 additions & 2 deletions instrumentation/mysql2/lib/opentelemetry/instrumentation/mysql2/patches/client.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -9,7 +9,7 @@ module Instrumentation
module Mysql2
module Patches
# Module to prepend to Mysql2::Client for instrumentation
module Client
module Client # rubocop:disable Metrics/ModuleLength
QUERY_NAMES = [
'set names',
'select',
Expand Down Expand Up @@ -73,10 +73,13 @@ def obfuscate_sql(sql)
if sql.size > 2000
'SQL query too large to remove sensitive data ...'
else
obfuscated = sql.gsub(generated_mysql_regex, '?')
obfuscated = OpenTelemetry::Common::Utilities.utf8_encode(sql)
obfuscated = obfuscated.gsub(generated_mysql_regex, '?')
obfuscated = 'Failed to obfuscate SQL query - quote characters remained after obfuscation' if detect_unmatched_pairs(obfuscated)
obfuscated
end
rescue StandardError
'OpenTelemetry error: failed to obfuscate sql'
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@ahayworth ahayworth Oct 25, 2022

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Is it possible to make a more specific error message here?

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@robertlaurin robertlaurin Oct 25, 2022

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I wasn't sure how specific to make it, this is what will get plunked into the the db.statement attribute field. I'm being prudent about capturing any information about what was failed to be obfuscated.

What did you have in mind? Like the error class or something?

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@ahayworth ahayworth Oct 25, 2022

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Ah, I didn't realize that this would get put into the db.statement field, which is my bad for not looking closely enough. I think this is fine. 👍

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@fbogsany fbogsany Oct 25, 2022

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Probably not something you need to address here, but it'd be useful to use a common prefix for all the "error" type substitutions (this and the two above) - it'd make it easier for Observability teams to monitor this behaviour. Metrics might be nice as well, but a competent engineer can build metrics from the db.statement in a span processor or in the collector.

end

def generated_mysql_regex
Expand Down
13 changes: 13 additions & 0 deletions instrumentation/mysql2/test/opentelemetry/instrumentation/mysql2/instrumentation_test.rb
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Expand Up @@ -209,6 +209,19 @@
_(span.attributes['net.peer.name']).must_equal host.to_s
_(span.attributes['net.peer.port']).must_equal port.to_s
end

it 'encodes invalid byte sequences for db.statement' do
# \255 is off-limits https://en.wikipedia.org/wiki/UTF-8#Codepage_layout
sql = "SELECT * from users where users.id = 1 and users.email = '[email protected]\255'"
obfuscated_sql = 'SELECT * from users where users.id = ? and users.email = ?'

expect do
client.query(sql)
end.must_raise Mysql2::Error

_(span.name).must_equal 'select'
_(span.attributes['db.statement']).must_equal obfuscated_sql
end
end

describe 'when enable_sql_obfuscation is enabled with db_statement set' do
Expand Down