discourse/lib/discourse_connect_base.rb

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# frozen_string_literal: true
class DiscourseConnectBase
class ParseError < RuntimeError; end
ACCESSORS = %i{
add_groups
admin moderator
avatar_force_update
avatar_url
bio
card_background_url
email
external_id
groups
locale
locale_force_update
logout
name
nonce
profile_background_url
remove_groups
require_activation
return_sso_url
suppress_welcome_message
title
username
website
location
}
FIXNUMS = []
BOOLS = %i{
admin
avatar_force_update
locale_force_update
logout
moderator
require_activation
suppress_welcome_message
}
def self.nonce_expiry_time
@nonce_expiry_time ||= 10.minutes
end
def self.nonce_expiry_time=(v)
@nonce_expiry_time = v
end
def self.used_nonce_expiry_time
24.hours
end
attr_accessor(*ACCESSORS)
attr_writer :sso_secret, :sso_url
def self.sso_secret
raise RuntimeError, "sso_secret not implemented on class, be sure to set it on instance"
end
def self.sso_url
raise RuntimeError, "sso_url not implemented on class, be sure to set it on instance"
end
def self.parse(payload, sso_secret = nil, **init_kwargs)
sso = new(**init_kwargs)
sso.sso_secret = sso_secret if sso_secret
parsed = Rack::Utils.parse_query(payload)
decoded = Base64.decode64(parsed["sso"])
decoded_hash = Rack::Utils.parse_query(decoded)
if sso.sign(parsed["sso"]) != parsed["sig"]
diags = "\n\nsso: #{parsed["sso"]}\n\nsig: #{parsed["sig"]}\n\nexpected sig: #{sso.sign(parsed["sso"])}"
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if parsed["sso"] =~ /[^a-zA-Z0-9=\r\n\/+]/m
raise ParseError, "The SSO field should be Base64 encoded, using only A-Z, a-z, 0-9, +, /, and = characters. Your input contains characters we don't understand as Base64, see http://en.wikipedia.org/wiki/Base64 #{diags}"
else
raise ParseError, "Bad signature for payload #{diags}"
end
end
ACCESSORS.each do |k|
val = decoded_hash[k.to_s]
val = val.to_i if FIXNUMS.include? k
if BOOLS.include? k
val = ["true", "false"].include?(val) ? val == "true" : nil
end
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sso.public_send("#{k}=", val)
end
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decoded_hash.each do |k, v|
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if field = k[/^custom\.(.+)$/, 1]
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sso.custom_fields[field] = v
end
end
sso
end
def diagnostics
DiscourseConnectBase::ACCESSORS.map { |a| "#{a}: #{public_send(a)}" }.join("\n")
end
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def sso_secret
@sso_secret || self.class.sso_secret
end
def sso_url
@sso_url || self.class.sso_url
end
def custom_fields
@custom_fields ||= {}
end
def sign(payload, secret = nil)
secret = secret || sso_secret
OpenSSL::HMAC.hexdigest("sha256", secret, payload)
end
FEATURE: Allow using invites when DiscourseConnect SSO is enabled (#12419) This PR allows invitations to be used when the DiscourseConnect SSO is enabled for a site (`enable_discourse_connect`) and local logins are disabled. Previously invites could not be accepted with SSO enabled simply because we did not have the code paths to handle that logic. The invitation methods that are supported include: * Inviting people to groups via email address * Inviting people to topics via email address * Using invitation links generated by the Invite Users UI in the /my/invited/pending route The flow works like this: 1. User visits an invite URL 2. The normal invitation validations (redemptions/expiry) happen at that point 3. We store the invite key in a secure session 4. The user clicks "Accept Invitation and Continue" (see below) 5. The user is redirected to /session/sso then to the SSO provider URL then back to /session/sso_login 6. We retrieve the invite based on the invite key in secure session. We revalidate the invitation. We show an error to the user if it is not valid. An additional check here for invites with an email specified is to check the SSO email matches the invite email 7. If the invite is OK we create the user via the normal SSO methods 8. We redeem the invite and activate the user. We clear the invite key in secure session. 9. If the invite had a topic we redirect the user there, otherwise we redirect to / Note that we decided for SSO-based invites the `must_approve_users` site setting is ignored, because the invite is a form of pre-approval, and because regular non-staff users cannot send out email invites or generally invite to the forum in this case. Also deletes some group invite checks as per https://github.com/discourse/discourse/pull/12353
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def to_json
self.to_h.to_json
end
def to_url(base_url = nil)
base = "#{base_url || sso_url}"
"#{base}#{base.include?('?') ? '&' : '?'}#{payload}"
end
def payload(secret = nil)
payload = Base64.strict_encode64(unsigned_payload)
"sso=#{CGI::escape(payload)}&sig=#{sign(payload, secret)}"
end
def unsigned_payload
FEATURE: Allow using invites when DiscourseConnect SSO is enabled (#12419) This PR allows invitations to be used when the DiscourseConnect SSO is enabled for a site (`enable_discourse_connect`) and local logins are disabled. Previously invites could not be accepted with SSO enabled simply because we did not have the code paths to handle that logic. The invitation methods that are supported include: * Inviting people to groups via email address * Inviting people to topics via email address * Using invitation links generated by the Invite Users UI in the /my/invited/pending route The flow works like this: 1. User visits an invite URL 2. The normal invitation validations (redemptions/expiry) happen at that point 3. We store the invite key in a secure session 4. The user clicks "Accept Invitation and Continue" (see below) 5. The user is redirected to /session/sso then to the SSO provider URL then back to /session/sso_login 6. We retrieve the invite based on the invite key in secure session. We revalidate the invitation. We show an error to the user if it is not valid. An additional check here for invites with an email specified is to check the SSO email matches the invite email 7. If the invite is OK we create the user via the normal SSO methods 8. We redeem the invite and activate the user. We clear the invite key in secure session. 9. If the invite had a topic we redirect the user there, otherwise we redirect to / Note that we decided for SSO-based invites the `must_approve_users` site setting is ignored, because the invite is a form of pre-approval, and because regular non-staff users cannot send out email invites or generally invite to the forum in this case. Also deletes some group invite checks as per https://github.com/discourse/discourse/pull/12353
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Rack::Utils.build_query(self.to_h)
end
def to_h
payload = {}
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ACCESSORS.each do |k|
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next if (val = public_send(k)) == nil
payload[k] = val
end
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@custom_fields&.each do |k, v|
payload["custom.#{k}"] = v.to_s
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end
FEATURE: Allow using invites when DiscourseConnect SSO is enabled (#12419) This PR allows invitations to be used when the DiscourseConnect SSO is enabled for a site (`enable_discourse_connect`) and local logins are disabled. Previously invites could not be accepted with SSO enabled simply because we did not have the code paths to handle that logic. The invitation methods that are supported include: * Inviting people to groups via email address * Inviting people to topics via email address * Using invitation links generated by the Invite Users UI in the /my/invited/pending route The flow works like this: 1. User visits an invite URL 2. The normal invitation validations (redemptions/expiry) happen at that point 3. We store the invite key in a secure session 4. The user clicks "Accept Invitation and Continue" (see below) 5. The user is redirected to /session/sso then to the SSO provider URL then back to /session/sso_login 6. We retrieve the invite based on the invite key in secure session. We revalidate the invitation. We show an error to the user if it is not valid. An additional check here for invites with an email specified is to check the SSO email matches the invite email 7. If the invite is OK we create the user via the normal SSO methods 8. We redeem the invite and activate the user. We clear the invite key in secure session. 9. If the invite had a topic we redirect the user there, otherwise we redirect to / Note that we decided for SSO-based invites the `must_approve_users` site setting is ignored, because the invite is a form of pre-approval, and because regular non-staff users cannot send out email invites or generally invite to the forum in this case. Also deletes some group invite checks as per https://github.com/discourse/discourse/pull/12353
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payload
end
end