ssh: limit RSA key size in OpenSSH private key parsing
parseOpenSSHPrivateKey builds an rsa.PrivateKey directly from the unmarshalled OpenSSH key blob, bypassing parseRSA and its modulus limit. Validate() and Precompute() then perform several modular exponentiations whose cost grows with the size of the prime factors; in particular Precompute() recomputes the CRT coefficient as q^(p-2) mod p, which is cubic in |p|. A maliciously crafted key with oversized N and P can keep the CPU busy for hours or days during a single load. Mirror the parseRSA validation here: cap the modulus at 8192 bits (the same limit enforced by crypto/tls), reject exponents larger than 24 bits, and reject invalid exponent values (< 3 or even). In addition, bound each prime factor at 4096 bits to prevent the CRT computation from becoming the dominant cost. This issue was found during a security audit by NCC Group Cryptography Services, sponsored by Teleport, and was assessed and is being fixed as a non-security bug. Change-Id: Ia5991f25dd41a22eddd7cf63a8fc5106de9e9663 Reviewed-on: https://go-review.googlesource.com/c/crypto/+/782420 Reviewed-by: Filippo Valsorda <filippo@golang.org> Reviewed-by: Junyang Shao <shaojunyang@google.com> Reviewed-by: David Chase <drchase@google.com> LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
This commit is contained in:
Nicola Murino
@@ -232,6 +232,200 @@ func TestParseRSAModulusTooLarge(t *testing.T) {
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}
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}
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func TestParsePrivateKeyRSAModulusTooLarge(t *testing.T) {
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rsa16384 := []byte(`-----BEGIN OPENSSH PRIVATE KEY-----
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RAMFupBQ3zIP9/BoNBjxZ8qINThI+qr7Q9jbKwLGVqAvGx5k4IEjQxTHdgvNQFJj47tKM+
|
||||
6ClytN3CS+paNgT+UywJpLzyGppOZvuxDiq6WkF+DXd9KFefJG3XRHQEGcq0WKY4gkL8oO
|
||||
CaVPbeciSOrxuudjun26oQurWyqstckbWDdtONwpLPECA1oRqfDzUicI6lTQIoWcPWrida
|
||||
XAU85XWyxgkhVTYo3jPPoDurzwjeNE8CaPrD870FFBpyDkoSmh9S0qfuwxrZac1TKeqc2N
|
||||
RtK0V1XYoHh4JDWZUiVy2jK/2CluVvLnDrf1V7Diz25B/HLFUiZ2uKGta+ccTZWMhDdnOH
|
||||
d1+E7dlS623833w2P0c7BbEUbBWuUY3EOnUAz2mqdw12kaHLlSHUrHY1IBVQrmCn498Rr9
|
||||
TbgT6sO5aTOROU8Y2iEaXXxzmCZYYKJA3Of3VXBXUb4CDx1aBdFm/PpvjI9S5qgEdgVwmK
|
||||
9nT0Ag3mmnKpefdRirEbQUy9Cb6JaC+UXlQ8s0ToHs8Sm1LxbFtWnemJ0Sgcxjqv6BSDe/
|
||||
GO+6bhXXwwNldR7NX8+3HS2cnEjEMjdOZChbwKCF+WCf7v0U6+fu9UvOibFGpDLAbeTKRv
|
||||
dC1QZqGNvdadx0zB5mzlfZ6K+ANY9DPrKQjn3o2OrRYNDGM80yiIzyYMd4g+cSU81ge+s4
|
||||
7UYBXRYVlB+yeFfmnyiVyf4SEaayr7TjUK60B+OwPPqTQAucEtc9TYKmQzVQzxmhTDW6k4
|
||||
15DfIZfyMcPmWljoLq8dmLQl2I53jm0SQ4gQx7rYpOoJiVejkT2DCGHu2w47QWBYuEhkdv
|
||||
rNniy5fZBw+9OBuIujsfEpxMGAQ58PmTH5+1KNqHL40AAAQBAOmmLGLXkJabeN8qcIOaTP
|
||||
DY+c1++lOuMGpleUMH4fIP5EbLyYOldBFV5klrDKmCM1dc1/jUF/kppgMhOdr8XNhoBZNH
|
||||
BrzibkbE41BI8XvqWNIT6UMrHxgnEsij/F9rVw75KMJu0oeZgmNaAg+hm8+nOwV7PL7/GG
|
||||
IrbXPKpoTtKXob3w3ig1+AJBbz+tlyjL2sfjG8M+DUgaa8R4SCOk6msVWhUfGWHLXB/Cgl
|
||||
xX5wqmSvmq8wxctvdSvJ/xL4tCV4SNvhbj4BKg+Tc9wpRR04r/8DFAb/e+bLao7v1sl0OV
|
||||
65+qtsmng93d8jp0wSD9ZNHCplqdEixyEMMyrOOCFp3vPYunz3GMosDkciR8ClnxBc6kg4
|
||||
bATgWUxV1lC+ycGttdTSRx583djPZ68a3IVIo01fmhIGioiYCpTyFHtlljOapO7Qe7wO7S
|
||||
THnoT2bZDlSu2GIA9CXl8KHqOLGtF75tEfDW4yEg/LpyoMfNxjJqN0w6zMh6gI5N0F31BR
|
||||
73BmjjJ1usQT8kJ3Kdaru+U9IxsQTyfk/cu1WiBrrB6FYQ7XMwKvXPyeijI9oHXDP2SZtV
|
||||
ry7RwvMgEPLh5MjUX3y8nOWuqR0gkPVDtPiTQKogE07TXDyUVsIiNSlVEur5mpFWppC1nm
|
||||
K1nPCC8Smr6d4pScg3UCLOR3ZJXyPtRSDn/n5q2eN2GymHcpvK6yx0RUVaXmw4iU9vNIOO
|
||||
4s7fdEcpvDJog5TQHpWp3qP/S3Ug38xP56qN88+j01sa27PuNY7gF5UouewQjfvJ8xtCVF
|
||||
vcVJ4XgxDAhdrptMX4MJPXpgS536f+8y03ahSJt+qzQacTfyzdJUDQ1jICD9UXrjSRw07F
|
||||
/I4dvnm4rn9mJNGFUFDcnK4CD7/RwJRlAtJrUG7/eyxXLjrBcbP76CaERitVFgJuMwNSme
|
||||
2QY2EXyUkQ+nwYJJt3Vjofo9UFWONWikQshnrKwebaCYwpK6U1A16cdPKFc8cUuUvMdEB3
|
||||
Vb9Iq2LmxjbCYwGqTpUp2LE1VWIyuZgjI4lOTeegWlQ+7w3zEqxofO9fNy4KgrWUxBEh5V
|
||||
z22mdB4/3So9Oq/zE1o4cpQwQFooa3OlC+A30JdRJZ9FAJDMQ49IOeki7xEKp5B+5omCcI
|
||||
MlsmsEwj4/pSCjOBREos86rfNQMJ/N03kFl+dk0iE7NHxLo26nzAsCzV9kEK7R0SxtWZSC
|
||||
HJbhMNoeNwQJPhEpKO5TKlnFDQ08VlSqIWTKc3yWqCZb68+c5AiMLfEqiI8pix/MKHkSKV
|
||||
XRfgxwWVuli1UEhTRXm1ZSxVJaJLt0s6ePgEi7a8qRvep8uyh8/QgTUEW71CV9RpvklCm/
|
||||
VSdgCrS/bwXo3YsAAAQBAN8ZoTRbrSIOXheb6KeZqNKJiiYjVYPHNoJYoVqtBNj6pPeNm9
|
||||
iMeZhFs8TnHCYEcQ31+5LwCShFbKfaO+aBTHB57LpY+H8rG5OTdim+fhqH061pOTzDCZhQ
|
||||
h7NUwIxK/hM0QBR/69cPOTFKSH0R997MAh/FougAgX5SwIp0rg6wFOG0sXla9oc3qZXuOE
|
||||
7SGHIPe3ffQk70R8EdVTPuPATNe5a7qLUZEC6qf9nScpIyAEluCZF8VCf93oeqaTF3n/qG
|
||||
gRnrj8S/zYdgFKONnZZL49NR4M1bQaOw0Ls2fR97rrWnqZFzevgZYSV7tgn+hf3JNo0nWm
|
||||
LbubR8mLBUjx5u1nq1Od22TwUhS2eXXldPn0TLrofK1l0TzkwSsk4FypxNc/7uZVY0OJN+
|
||||
FIQpeK4hVcbX/tIpC1gMXJVqybRRT+x7G2EC5CHLJFV+G0FwKawBqhnLD0wWPWY++fpQ5g
|
||||
ZEWPu2cVZppC7MDSExum8+xQikprZdkOKBC5UGCqHfVXs60tcEHUB0VWWWVq0+WV8KH2XN
|
||||
OONfl+dg5NdbgdLunAjD80oKh7rMRnJ686Sr3Jh5HSOnJ0QEZ+8G1Iz0vFWTHwAKtrzSBk
|
||||
XsnnGbPZiFEybhNfae0VSgBgL6Ch/8yOsby3ZvGS1v1MY7XLM74o0IDHXPBzm4NoukM9dD
|
||||
ELcLgYdDaX3RSq0U2FmyyU/lIaasOArSwf3bgAIFGQ8ux45LWW/vQ51aRCwiw6gwwCzHj5
|
||||
bS4KfUTxX6E+tucHaq1S108E4UtkizFyyhNdeg49P1ljhGt0EfjIoHKJOevtH6sfvjt9U7
|
||||
nx6vuAiyGOHb3Od2SzMYXM3evC102F2xGqsZpgAyQ/WVcj6kI4mCd0LoLsSqNUrcNaG93Z
|
||||
ntt+lm3Wif11EZW37+Xe0TLg/Fi3VUaeju89grBiS4hvRBKz+yjiNwFJ8PvS47T91ORzTD
|
||||
3SepgdMIi26umLMBqXfTKLnJvKmnYHdNfaaH5rW81EFh3xyPaoaatZ4vwJzj0IIQdeBIke
|
||||
KiDfEjYAERQfXi/SG8cGONz/VWA97LroWuaNDa6YN1p6PzTUIEDTHdz5a1jnA7zApeHU7Q
|
||||
EO0zINv0O0TXVDYPWjB6Wysnw7hIFg5HOAUz5DamkEWCifKQ0MH9dgKb9BiFPxwuvWrBIR
|
||||
hqB5YPvUvyz8aYVm+RdbjMV0jCyUMxNe74/o02TrXbj5u50H2KfqD3qjFxu4BXzsw8sXBM
|
||||
e0IdOmYjTAYEpHQRqNLhKdIcycTkXZ+K4SZwmK9VLI0ggn6NwSR8H1hZ7+GMnSTLtPm2u2
|
||||
OthateBQGfnsGpTLxkpydh4jlYzTCp9bVRK8YXwsocglOcaRQH5ghfmgsAAAALbmljb2xh
|
||||
QHAxNnM=
|
||||
-----END OPENSSH PRIVATE KEY-----
|
||||
`)
|
||||
_, err := ParseRawPrivateKey(rsa16384)
|
||||
if err == nil {
|
||||
t.Fatal("ParseRawPrivateKey accepted a 16384-bit modulus; expected it to be rejected")
|
||||
}
|
||||
|
||||
expectedError := "rsa modulus too large"
|
||||
if !strings.Contains(err.Error(), expectedError) {
|
||||
t.Errorf("unexpected error message: got %q, want substring %q", err.Error(), expectedError)
|
||||
}
|
||||
}
|
||||
|
||||
func TestParseECPrivateKey(t *testing.T) {
|
||||
key := testPrivateKeys["ecdsa"]
|
||||
|
||||
|
||||
Reference in New Issue
Block a user