decryptcore: preload OpenSSL error strings; seed PRNGAs in r360226, preload OpenSSL error strings and seed the PRNGbefore entering capability mode.MFC after: 2 weeksSponsored by: Dell EMC Isilon
Do a sweep and remove most WARNS=6 settingsRepeating the default WARNS here makes it slightly more difficult toexperiment with default WARNS changes, e.g. if we did something absolutelybananas an
Do a sweep and remove most WARNS=6 settingsRepeating the default WARNS here makes it slightly more difficult toexperiment with default WARNS changes, e.g. if we did something absolutelybananas and introduced a WARNS=7 and wanted to try lifting the default tothat.Drop most of them; there is one in the blake2 kernel module, but I suspectit should be dropped -- the default WARNS in the rest of the build doesn'tcurrently apply to kernel modules, and I haven't put too much thought intowhether it makes sense to make it so.
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EKCD: Preload error strings, PRNG seed; use OAEP paddingPreload OpenSSL ERR string data so that the formatted error messages arevaguely meaningful. Add OpenSSL error information to the RSA_public_
EKCD: Preload error strings, PRNG seed; use OAEP paddingPreload OpenSSL ERR string data so that the formatted error messages arevaguely meaningful. Add OpenSSL error information to the RSA_public_encrypt()operation failure case in one-time key generation.For obsolescent OpenSSL versions (*cough* FIPS *cough*), pre-seed the PRNGbefore entering Cap mode, as old versions of OpenSSL are unaware of kernelRNG interfaces aside from /dev/random (such as the long-supported kern.arnd, orthe slightly more recent getentropy(3) or getrandom(2)). (RSA_public_encrypt()wants a seeded PRNG to randomize the "PS" portion of PKCS 1.5 padding or the"MGF" pseudo-random function in OAEP padding.)Switch dumpon to encrypt the one-time key with OAEP padding (recommended since1998; RFC2437) rather than the obsolescent PKCS 1.5 padding (1993; RFC2313).Switch decryptcore to attempt OAEP decryption first, and try PKCS 1.5decryption on failure. This is intended only for transition convenience, andwe should obsolete support for non-OAEP padding in a release or two.Reviewed by: markjMFC After: 2 weeksSponsored by: Dell EMC IsilonDifferential Revision: https://reviews.freebsd.org/D24534
decryptcore: load the nls dataLoad the nls data before the openssl will try to do it in thecapability mode.On my machine the sa_ossl_private_decrypt is trying to do that.MFC after: 2 weeks
EKCD: Add Chacha20 encryption modeAdd Chacha20 mode to Encrypted Kernel Crash Dumps.Chacha20 does not require messages to be multiples of block size, so it isvalid to use the cipher on non-block
EKCD: Add Chacha20 encryption modeAdd Chacha20 mode to Encrypted Kernel Crash Dumps.Chacha20 does not require messages to be multiples of block size, so it isvalid to use the cipher on non-block-sized messages without the explicitpadding AES-CBC would require. Therefore, allow use with simultaneous dumpcompression. (Continue to disallow use of AES-CBC EKCD with compression.)dumpon(8) gains a -C cipher flag to select between chacha and aes-cbc.It defaults to chacha if no -C option is provided. The man page documents thisbehavior.Relnotes: sureSponsored by: Dell EMC Isilon
Make decryptcore(8) buildable.
Convert `cap_enter() < 0 && errno != ENOSYS` to `caph_enter() < 0`.No functional change intended.
Bump date after r328535.Submitted by: def@
Fix misspelling of encryptedcore.PR: 223991Submitted by: Trond Endrestol <[email protected]>Approved by: pjd (mentor)
DIRDEPS_BUILD: Update dependencies.Sponsored by: Dell EMC Isilon
DIRDEPS_BUILD: Connect new directories.Sponsored by: Dell EMC Isilon
sbin: normalize paths using SRCTOP-relative paths or :H when possibleThis simplifies make logic/outputMFC after: 1 monthSponsored by: Dell EMC Isilon
Don't decrypt a core if a vmcore file already exists by default.Allow to change this behaviour using the -f flag.Approved by: pjd (mentor)
Fix bugs found by Coverity in decryptcore(8) and savecore(8):- Perform final decryption and write decrypted data in case of non-block alignedinput data;- Use strlcpy(3) instead of strncpy(3) to ve
Fix bugs found by Coverity in decryptcore(8) and savecore(8):- Perform final decryption and write decrypted data in case of non-block alignedinput data;- Use strlcpy(3) instead of strncpy(3) to verify if paths aren't too long;- Check errno after calling unlink(2) instead of calling stat(2) in order toverify if a decrypted core was created by a child process;- Free dumpkey.Reported by: Coverity, cem, pfgSuggested by: cemCID: 1366936, 1366942, 1366951, 1366952Approved by: pjd (mentor)
Language and mdoc cleanup.
Add support for encrypted kernel crash dumps.Changes include modifications in kernel crash dump routines, dumpon(8) andsavecore(8). A new tool called decryptcore(8) was added.A new DIOCSKERNELDU
Add support for encrypted kernel crash dumps.Changes include modifications in kernel crash dump routines, dumpon(8) andsavecore(8). A new tool called decryptcore(8) was added.A new DIOCSKERNELDUMP I/O control was added to send a kernel crash dumpconfiguration in the diocskerneldump_arg structure to the kernel.The old DIOCSKERNELDUMP I/O control was renamed to DIOCSKERNELDUMP_FREEBSD11 forbackward ABI compatibility.dumpon(8) generates an one-time random symmetric key and encrypts it usingan RSA public key in capability mode. Currently only AES-256-CBC is supportedbut EKCD was designed to implement support for other algorithms in the future.The public key is chosen using the -k flag. The dumpon rc(8) script can do thisautomatically during startup using the dumppubkey rc.conf(5) variable. Once thekeys are calculated dumpon sends them to the kernel via DIOCSKERNELDUMP I/Ocontrol.When the kernel receives the DIOCSKERNELDUMP I/O control it generates a randomIV and sets up the key schedule for the specified algorithm. Each time thekernel tries to write a crash dump to the dump device, the IV is replaced bya SHA-256 hash of the previous value. This is intended to make a possibledifferential cryptanalysis harder since it is possible to write multiple crashdumps without reboot by repeating the following commands:# sysctl debug.kdb.enter=1db> call doadump(0)db> continue# savecoreA kernel dump key consists of an algorithm identifier, an IV and an encryptedsymmetric key. The kernel dump key size is included in a kernel dump header.The size is an unsigned 32-bit integer and it is aligned to a block size.The header structure has 512 bytes to match the block size so it was required tomake a panic string 4 bytes shorter to add a new field to the header structure.If the kernel dump key size in the header is nonzero it is assumed that thekernel dump key is placed after the first header on the dump device and the coredump is encrypted.Separate functions were implemented to write the kernel dump header and thekernel dump key as they need to be unencrypted. The dump_write function encryptsdata if the kernel was compiled with the EKCD option. Encrypted kernel textdumpsare not supported due to the way they are constructed which makes it impossibleto use the CBC mode for encryption. It should be also noted that textdumps don'tcontain sensitive data by design as a user decides what information should bedumped.savecore(8) writes the kernel dump key to a key.# file if its size in the headeris nonzero. # is the number of the current core dump.decryptcore(8) decrypts the core dump using a private RSA key and the kerneldump key. This is performed by a child process in capability mode.If the decryption was not successful the parent process removes a partiallydecrypted core dump.Description on how to encrypt crash dumps was added to the decryptcore(8),dumpon(8), rc.conf(5) and savecore(8) manual pages.EKCD was tested on amd64 using bhyve and i386, mipsel and sparc64 using QEMU.The feature still has to be tested on arm and arm64 as it wasn't possible to runFreeBSD due to the problems with QEMU emulation and lack of hardware.Designed by: def, pjdReviewed by: cem, oshogbo, pjdPartial review: delphij, emaste, jhb, kibApproved by: pjd (mentor)Differential Revision: https://reviews.freebsd.org/D4712