Message-ID: <1430952572.31614.10.camel@...1866...> From: David Woodhouse Date: Wed, 06 May 2015 23:49:32 +0100 In-Reply-To: <1430942786-31419-1-git-send-email-openvpn.list@...1114...> References: <1430942786-31419-1-git-send-email-openvpn.list@...1114...> Content-Type: multipart/signed; micalg="sha-1"; protocol="application/x-pkcs7-signature"; boundary="=-p5GPJyPCsupR7n/0kfxv" Mime-Version: 1.0 Subject: Re: [Openvpn-devel] [PATCHv2 0/4] Reworking the interface for querying users List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: David Sommerseth Cc: openvpn-devel@lists.sourceforge.net --=-p5GPJyPCsupR7n/0kfxv Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2015-05-06 at 22:06 +0200, David Sommerseth wrote: >=20 > All patches has been tested locally with different configurations, > requiring username, password and passphrases to PKCS#12 files. The > challenge/response interface has not been tested, as well as PKCS#11. > All runs via valgrind shows no memory leaks with this new > implementation. I've given some pointers in ticket 538 on how you can test PKCS#11 without actually having a hardware token =E2=80=94 you can use GNOME keyrin= g in many cases, or in this case where you really want to test=20 password input, you can use a NSS "softokn" database. Even if I make these patches build by fixing the issue that leads to libsystemd_MODVERSION being set to '219\n219' when both systemd.pc and libsystemd.pc exist, they still don't solve the problem described in that ticket. You are still calling fork() from a context (the PIN request callback from pkcs11-helper) in which it is forbidden, and in which it deadlocks: #2 0x00007ffff7d9c096 in _pkcs1h_threading_mutexLockAll () at pkcs11h-thre= ading.c:306 #3 0x00000038412c8362 in __libc_fork () at ../sysdeps/nptl/fork.c:89 #4 0x0000003841a0f4a5 in __fork () at pt-fork.c:25 #5 0x000000000042893b in openvpn_popen (a=3Da@...1851...=3D0x7fffffff9be0,= es=3Des@...1851...=3D0x0) at misc.c:374 #6 0x000000000046f0e8 in get_console_input_systemd (capacity=3D4096, input= =3D0x7fffffffb1f2 "", echo=3Dfalse,=20 prompt=3D0x73cdc8 "Enter PIV_II (PIV Card Holder pin) token Password:")= at console_systemd.c:72 #7 query_user_exec (setup=3D) at console_systemd.c:111 #8 0x0000000000427aed in get_user_pass_cr (up=3Dup@...1851...=3D0x7fffffff= a1f0, auth_file=3D, auth_file@...1851...=3D0x0,=20 prefix=3Dprefix@...1851...=3D0x7fffffff9df0 "PIV_II (PIV Card Holder pi= n) token", flags=3Dflags@...1851...=3D21, auth_challenge=3Dauth_challenge@...220...= ..1851...=3D0x0) at misc.c:1144 #9 0x0000000000435711 in get_user_pass (flags=3D21, prefix=3D0x7fffffff9df= 0 "PIV_II (PIV Card Holder pin) token", auth_file=3D0x0, up=3D0x7fffffffa1f= 0) at misc.h:268 #10 _pkcs11_openvpn_pin_prompt (global_data=3D, user_data=3D= , token=3D, retry=3D, pin=3D0x= 7fffffffc250 "K{`f=3D",=20 pin_max=3D1024) at pkcs11.c:236 #11 0x00007ffff7d9e0cb in _pkcs11h_session_login (session=3D0x6e9220, is_pu= blicOnly=3Dis_publicOnly@...1851...=3D0, readonly=3Dreadonly@...1851...=3D1= , user_data=3D0x0,=20 mask_prompt=3D) at pkcs11h-session.c:1023 Perhaps the solution might be to *always* operate in 'management interface' mode, and to shift all the direct console access out to a separate process. *That* process would be permitted to run fork(), when the core OpenVPN process requests a password... --=20 dwmw2 --=-p5GPJyPCsupR7n/0kfxv Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: 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