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security.rb
# frozen_string_literal: true #-- # Copyright 2006 by Chad Fowler, Rich Kilmer, Jim Weirich and others. # All rights reserved. # See LICENSE.txt for permissions. #++ require_relative "exceptions" require_relative "openssl" ## # = Signing gems # # The Gem::Security implements cryptographic signatures for gems. The section # below is a step-by-step guide to using signed gems and generating your own. # # == Walkthrough # # === Building your certificate # # In order to start signing your gems, you'll need to build a private key and # a self-signed certificate. Here's how: # # # build a private key and certificate for yourself: # $ gem cert --build you@example.com # # This could take anywhere from a few seconds to a minute or two, depending on # the speed of your computer (public key algorithms aren't exactly the # speediest crypto algorithms in the world). When it's finished, you'll see # the files "gem-private_key.pem" and "gem-public_cert.pem" in the current # directory. # # First things first: Move both files to ~/.gem if you don't already have a # key and certificate in that directory. Ensure the file permissions make the # key unreadable by others (by default the file is saved securely). # # Keep your private key hidden; if it's compromised, someone can sign packages # as you (note: PKI has ways of mitigating the risk of stolen keys; more on # that later). # # === Signing Gems # # In RubyGems 2 and newer there is no extra work to sign a gem. RubyGems will # automatically find your key and certificate in your home directory and use # them to sign newly packaged gems. # # If your certificate is not self-signed (signed by a third party) RubyGems # will attempt to load the certificate chain from the trusted certificates. # Use <code>gem cert --add signing_cert.pem</code> to add your signers as # trusted certificates. See below for further information on certificate # chains. # # If you build your gem it will automatically be signed. If you peek inside # your gem file, you'll see a couple of new files have been added: # # $ tar tf your-gem-1.0.gem # metadata.gz # metadata.gz.sig # metadata signature # data.tar.gz # data.tar.gz.sig # data signature # checksums.yaml.gz # checksums.yaml.gz.sig # checksums signature # # === Manually signing gems # # If you wish to store your key in a separate secure location you'll need to # set your gems up for signing by hand. To do this, set the # <code>signing_key</code> and <code>cert_chain</code> in the gemspec before # packaging your gem: # # s.signing_key = '/secure/path/to/gem-private_key.pem' # s.cert_chain = %w[/secure/path/to/gem-public_cert.pem] # # When you package your gem with these options set RubyGems will automatically # load your key and certificate from the secure paths. # # === Signed gems and security policies # # Now let's verify the signature. Go ahead and install the gem, but add the # following options: <code>-P HighSecurity</code>, like this: # # # install the gem with using the security policy "HighSecurity" # $ sudo gem install your.gem -P HighSecurity # # The <code>-P</code> option sets your security policy -- we'll talk about # that in just a minute. Eh, what's this? # # $ gem install -P HighSecurity your-gem-1.0.gem # ERROR: While executing gem ... (Gem::Security::Exception) # root cert /CN=you/DC=example is not trusted # # The culprit here is the security policy. RubyGems has several different # security policies. Let's take a short break and go over the security # policies. Here's a list of the available security policies, and a brief # description of each one: # # * NoSecurity - Well, no security at all. Signed packages are treated like # unsigned packages. # * LowSecurity - Pretty much no security. If a package is signed then # RubyGems will make sure the signature matches the signing # certificate, and that the signing certificate hasn't expired, but # that's it. A malicious user could easily circumvent this kind of # security. # * MediumSecurity - Better than LowSecurity and NoSecurity, but still # fallible. Package contents are verified against the signing # certificate, and the signing certificate is checked for validity, # and checked against the rest of the certificate chain (if you don't # know what a certificate chain is, stay tuned, we'll get to that). # The biggest improvement over LowSecurity is that MediumSecurity # won't install packages that are signed by untrusted sources. # Unfortunately, MediumSecurity still isn't totally secure -- a # malicious user can still unpack the gem, strip the signatures, and # distribute the gem unsigned. # * HighSecurity - Here's the bugger that got us into this mess. # The HighSecurity policy is identical to the MediumSecurity policy, # except that it does not allow unsigned gems. A malicious user # doesn't have a whole lot of options here; they can't modify the # package contents without invalidating the signature, and they can't # modify or remove signature or the signing certificate chain, or # RubyGems will simply refuse to install the package. Oh well, maybe # they'll have better luck causing problems for CPAN users instead :). # # The reason RubyGems refused to install your shiny new signed gem was because # it was from an untrusted source. Well, your code is infallible (naturally), # so you need to add yourself as a trusted source: # # # add trusted certificate # gem cert --add ~/.gem/gem-public_cert.pem # # You've now added your public certificate as a trusted source. Now you can # install packages signed by your private key without any hassle. Let's try # the install command above again: # # # install the gem with using the HighSecurity policy (and this time # # without any shenanigans) # $ gem install -P HighSecurity your-gem-1.0.gem # Successfully installed your-gem-1.0 # 1 gem installed # # This time RubyGems will accept your signed package and begin installing. # # While you're waiting for RubyGems to work it's magic, have a look at some of # the other security commands by running <code>gem help cert</code>: # # Options: # -a, --add CERT Add a trusted certificate. # -l, --list [FILTER] List trusted certificates where the # subject contains FILTER # -r, --remove FILTER Remove trusted certificates where the # subject contains FILTER # -b, --build EMAIL_ADDR Build private key and self-signed # certificate for EMAIL_ADDR # -C, --certificate CERT Signing certificate for --sign # -K, --private-key KEY Key for --sign or --build # -A, --key-algorithm ALGORITHM Select key algorithm for --build from RSA, DSA, or EC. Defaults to RSA. # -s, --sign CERT Signs CERT with the key from -K # and the certificate from -C # -d, --days NUMBER_OF_DAYS Days before the certificate expires # -R, --re-sign Re-signs the certificate from -C with the key from -K # # We've already covered the <code>--build</code> option, and the # <code>--add</code>, <code>--list</code>, and <code>--remove</code> commands # seem fairly straightforward; they allow you to add, list, and remove the # certificates in your trusted certificate list. But what's with this # <code>--sign</code> option? # # === Certificate chains # # To answer that question, let's take a look at "certificate chains", a # concept I mentioned earlier. There are a couple of problems with # self-signed certificates: first of all, self-signed certificates don't offer # a whole lot of security. Sure, the certificate says Yukihiro Matsumoto, but # how do I know it was actually generated and signed by matz himself unless he # gave me the certificate in person? # # The second problem is scalability. Sure, if there are 50 gem authors, then # I have 50 trusted certificates, no problem. What if there are 500 gem # authors? 1000? Having to constantly add new trusted certificates is a # pain, and it actually makes the trust system less secure by encouraging # RubyGems users to blindly trust new certificates. # # Here's where certificate chains come in. A certificate chain establishes an # arbitrarily long chain of trust between an issuing certificate and a child # certificate. So instead of trusting certificates on a per-developer basis, # we use the PKI concept of certificate chains to build a logical hierarchy of # trust. Here's a hypothetical example of a trust hierarchy based (roughly) # on geography: # # -------------------------- # | rubygems@rubygems.org | # -------------------------- # | # ----------------------------------- # | | # ---------------------------- ----------------------------- # | seattlerb@seattlerb.org | | dcrubyists@richkilmer.com | # ---------------------------- ----------------------------- # | | | | # --------------- ---------------- ----------- -------------- # | drbrain | | zenspider | | pabs@dc | | tomcope@dc | # --------------- ---------------- ----------- -------------- # # # Now, rather than having 4 trusted certificates (one for drbrain, zenspider, # pabs@dc, and tomecope@dc), a user could actually get by with one # certificate, the "rubygems@rubygems.org" certificate. # # Here's how it works: # # I install "rdoc-3.12.gem", a package signed by "drbrain". I've never heard # of "drbrain", but his certificate has a valid signature from the # "seattle.rb@seattlerb.org" certificate, which in turn has a valid signature # from the "rubygems@rubygems.org" certificate. Voila! At this point, it's # much more reasonable for me to trust a package signed by "drbrain", because # I can establish a chain to "rubygems@rubygems.org", which I do trust. # # === Signing certificates # # The <code>--sign</code> option allows all this to happen. A developer # creates their build certificate with the <code>--build</code> option, then # has their certificate signed by taking it with them to their next regional # Ruby meetup (in our hypothetical example), and it's signed there by the # person holding the regional RubyGems signing certificate, which is signed at # the next RubyConf by the holder of the top-level RubyGems certificate. At # each point the issuer runs the same command: # # # sign a certificate with the specified key and certificate # # (note that this modifies client_cert.pem!) # $ gem cert -K /mnt/floppy/issuer-priv_key.pem -C issuer-pub_cert.pem # --sign client_cert.pem # # Then the holder of issued certificate (in this case, your buddy "drbrain"), # can start using this signed certificate to sign RubyGems. By the way, in # order to let everyone else know about his new fancy signed certificate, # "drbrain" would save his newly signed certificate as # <code>~/.gem/gem-public_cert.pem</code> # # Obviously this RubyGems trust infrastructure doesn't exist yet. Also, in # the "real world", issuers actually generate the child certificate from a # certificate request, rather than sign an existing certificate. And our # hypothetical infrastructure is missing a certificate revocation system. # These are that can be fixed in the future... # # At this point you should know how to do all of these new and interesting # things: # # * build a gem signing key and certificate # * adjust your security policy # * modify your trusted certificate list # * sign a certificate # # == Manually verifying signatures # # In case you don't trust RubyGems you can verify gem signatures manually: # # 1. Fetch and unpack the gem # # gem fetch some_signed_gem # tar -xf some_signed_gem-1.0.gem # # 2. Grab the public key from the gemspec # # gem spec some_signed_gem-1.0.gem cert_chain | \ # ruby -rpsych -e 'puts Psych.load($stdin)' > public_key.crt # # 3. Generate a SHA1 hash of the data.tar.gz # # openssl dgst -sha1 < data.tar.gz > my.hash # # 4. Verify the signature # # openssl rsautl -verify -inkey public_key.crt -certin \ # -in data.tar.gz.sig > verified.hash # # 5. Compare your hash to the verified hash # # diff -s verified.hash my.hash # # 6. Repeat 5 and 6 with metadata.gz # # == OpenSSL Reference # # The .pem files generated by --build and --sign are PEM files. Here's a # couple of useful OpenSSL commands for manipulating them: # # # convert a PEM format X509 certificate into DER format: # # (note: Windows .cer files are X509 certificates in DER format) # $ openssl x509 -in input.pem -outform der -out output.der # # # print out the certificate in a human-readable format: # $ openssl x509 -in input.pem -noout -text # # And you can do the same thing with the private key file as well: # # # convert a PEM format RSA key into DER format: # $ openssl rsa -in input_key.pem -outform der -out output_key.der # # # print out the key in a human readable format: # $ openssl rsa -in input_key.pem -noout -text # # == Bugs/TODO # # * There's no way to define a system-wide trust list. # * custom security policies (from a YAML file, etc) # * Simple method to generate a signed certificate request # * Support for OCSP, SCVP, CRLs, or some other form of cert status check # (list is in order of preference) # * Support for encrypted private keys # * Some sort of semi-formal trust hierarchy (see long-winded explanation # above) # * Path discovery (for gem certificate chains that don't have a self-signed # root) -- by the way, since we don't have this, THE ROOT OF THE CERTIFICATE # CHAIN MUST BE SELF SIGNED if Policy#verify_root is true (and it is for the # MediumSecurity and HighSecurity policies) # * Better explanation of X509 naming (ie, we don't have to use email # addresses) # * Honor AIA field (see note about OCSP above) # * Honor extension restrictions # * Might be better to store the certificate chain as a PKCS#7 or PKCS#12 # file, instead of an array embedded in the metadata. # # == Original author # # Paul Duncan <pabs@pablotron.org> # https://pablotron.org/ module Gem::Security ## # Gem::Security default exception type class Exception < Gem::Exception; end ## # Used internally to select the signing digest from all computed digests DIGEST_NAME = "SHA256" # :nodoc: ## # Length of keys created by RSA and DSA keys RSA_DSA_KEY_LENGTH = 3072 ## # Default algorithm to use when building a key pair DEFAULT_KEY_ALGORITHM = "RSA" ## # Named curve used for Elliptic Curve EC_NAME = "secp384r1" ## # Cipher used to encrypt the key pair used to sign gems. # Must be in the list returned by OpenSSL::Cipher.ciphers KEY_CIPHER = OpenSSL::Cipher.new("AES-256-CBC") if defined?(OpenSSL::Cipher) ## # One day in seconds ONE_DAY = 86_400 ## # One year in seconds ONE_YEAR = ONE_DAY * 365 ## # The default set of extensions are: # # * The certificate is not a certificate authority # * The key for the certificate may be used for key and data encipherment # and digital signatures # * The certificate contains a subject key identifier EXTENSIONS = { "basicConstraints" => "CA:FALSE", "keyUsage" => "keyEncipherment,dataEncipherment,digitalSignature", "subjectKeyIdentifier" => "hash", }.freeze def self.alt_name_or_x509_entry(certificate, x509_entry) alt_name = certificate.extensions.find do |extension| extension.oid == "#{x509_entry}AltName" end return alt_name.value if alt_name certificate.send x509_entry end ## # Creates an unsigned certificate for +subject+ and +key+. The lifetime of # the key is from the current time to +age+ which defaults to one year. # # The +extensions+ restrict the key to the indicated uses. def self.create_cert(subject, key, age = ONE_YEAR, extensions = EXTENSIONS, serial = 1) cert = OpenSSL::X509::Certificate.new cert.public_key = get_public_key(key) cert.version = 2 cert.serial = serial cert.not_before = Time.now cert.not_after = Time.now + age cert.subject = subject ef = OpenSSL::X509::ExtensionFactory.new nil, cert cert.extensions = extensions.map do |ext_name, value| ef.create_extension ext_name, value end cert end ## # Gets the right public key from a PKey instance def self.get_public_key(key) # Ruby 3.0 (Ruby/OpenSSL 2.2) or later return OpenSSL::PKey.read(key.public_to_der) if key.respond_to?(:public_to_der) return key.public_key unless key.is_a?(OpenSSL::PKey::EC) ec_key = OpenSSL::PKey::EC.new(key.group.curve_name) ec_key.public_key = key.public_key ec_key end ## # Creates a self-signed certificate with an issuer and subject from +email+, # a subject alternative name of +email+ and the given +extensions+ for the # +key+. def self.create_cert_email(email, key, age = ONE_YEAR, extensions = EXTENSIONS) subject = email_to_name email extensions = extensions.merge "subjectAltName" => "email:#{email}" create_cert_self_signed subject, key, age, extensions end ## # Creates a self-signed certificate with an issuer and subject of +subject+ # and the given +extensions+ for the +key+. def self.create_cert_self_signed(subject, key, age = ONE_YEAR, extensions = EXTENSIONS, serial = 1) certificate = create_cert subject, key, age, extensions sign certificate, key, certificate, age, extensions, serial end ## # Creates a new digest instance using the specified +algorithm+. The default # is SHA256. def self.create_digest(algorithm = DIGEST_NAME) OpenSSL::Digest.new(algorithm) end ## # Creates a new key pair of the specified +algorithm+. RSA, DSA, and EC # are supported. def self.create_key(algorithm) if defined?(OpenSSL::PKey) case algorithm.downcase when "dsa" OpenSSL::PKey::DSA.new(RSA_DSA_KEY_LENGTH) when "rsa" OpenSSL::PKey::RSA.new(RSA_DSA_KEY_LENGTH) when "ec" OpenSSL::PKey::EC.generate(EC_NAME) else raise Gem::Security::Exception, "#{algorithm} algorithm not found. RSA, DSA, and EC algorithms are supported." end end end ## # Turns +email_address+ into an OpenSSL::X509::Name def self.email_to_name(email_address) email_address = email_address.gsub(/[^\w@.-]+/i, "_") cn, dcs = email_address.split "@" dcs = dcs.split "." OpenSSL::X509::Name.new([ ["CN", cn], *dcs.map {|dc| ["DC", dc] }, ]) end ## # Signs +expired_certificate+ with +private_key+ if the keys match and the # expired certificate was self-signed. #-- # TODO increment serial def self.re_sign(expired_certificate, private_key, age = ONE_YEAR, extensions = EXTENSIONS) raise Gem::Security::Exception, "incorrect signing key for re-signing " + expired_certificate.subject.to_s unless expired_certificate.check_private_key(private_key) unless expired_certificate.subject.to_s == expired_certificate.issuer.to_s subject = alt_name_or_x509_entry expired_certificate, :subject issuer = alt_name_or_x509_entry expired_certificate, :issuer raise Gem::Security::Exception, "#{subject} is not self-signed, contact #{issuer} " \ "to obtain a valid certificate" end serial = expired_certificate.serial + 1 create_cert_self_signed(expired_certificate.subject, private_key, age, extensions, serial) end ## # Resets the trust directory for verifying gems. def self.reset @trust_dir = nil end ## # Sign the public key from +certificate+ with the +signing_key+ and # +signing_cert+, using the Gem::Security::DIGEST_NAME. Uses the # default certificate validity range and extensions. # # Returns the newly signed certificate. def self.sign(certificate, signing_key, signing_cert, age = ONE_YEAR, extensions = EXTENSIONS, serial = 1) signee_subject = certificate.subject signee_key = certificate.public_key alt_name = certificate.extensions.find do |extension| extension.oid == "subjectAltName" end extensions = extensions.merge "subjectAltName" => alt_name.value if alt_name issuer_alt_name = signing_cert.extensions.find do |extension| extension.oid == "subjectAltName" end extensions = extensions.merge "issuerAltName" => issuer_alt_name.value if issuer_alt_name signed = create_cert signee_subject, signee_key, age, extensions, serial signed.issuer = signing_cert.subject signed.sign signing_key, Gem::Security::DIGEST_NAME end ## # Returns a Gem::Security::TrustDir which wraps the directory where trusted # certificates live. def self.trust_dir return @trust_dir if @trust_dir dir = File.join Gem.user_home, ".gem", "trust" @trust_dir ||= Gem::Security::TrustDir.new dir end ## # Enumerates the trusted certificates via Gem::Security::TrustDir. def self.trusted_certificates(&block) trust_dir.each_certificate(&block) end ## # Writes +pemmable+, which must respond to +to_pem+ to +path+ with the given # +permissions+. If passed +cipher+ and +passphrase+ those arguments will be # passed to +to_pem+. def self.write(pemmable, path, permissions = 0o600, passphrase = nil, cipher = KEY_CIPHER) path = File.expand_path path File.open path, "wb", permissions do |io| if passphrase && cipher io.write pemmable.to_pem cipher, passphrase else io.write pemmable.to_pem end end path end reset end if Gem::HAVE_OPENSSL require_relative "security/policy" require_relative "security/policies" require_relative "security/trust_dir" end require_relative "security/signer"
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