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| author | Benny Baumann <BenBE@geshi.org> | 2023-12-11 13:44:41 +0100 |
|---|---|---|
| committer | Dmitry V. Levin <ldv@strace.io> | 2023-12-19 12:22:59 +0000 |
| commit | 4936f7dc386e0f0e16d4835954ab061e87399912 (patch) | |
| tree | 04ea63d085cfa58c4b7b53e7d33c7de67a6b8af8 /modules/pam_timestamp/hmac_openssl_wrapper.c | |
| parent | f2227807c7878a14c6cb02fab363d9607d667ec4 (diff) | |
| download | pam-4936f7dc386e0f0e16d4835954ab061e87399912.tar.gz pam-4936f7dc386e0f0e16d4835954ab061e87399912.tar.bz2 pam-4936f7dc386e0f0e16d4835954ab061e87399912.zip | |
pam_timestamp: prefer getrandom(2) when available
* configure.ac (AC_CHECK_HEADERS): Add sys/random.h.
(AC_CHECK_FUNCS): Add getrandom.
* modules/pam_timestamp/hmac_openssl_wrapper.c [HAVE_SYS_RANDOM_H]:
Include <sys/random.h>.
(generate_key) [HAVE_GETRANDOM]: Call getrandom(2) before trying
to open /dev/urandom.
Diffstat (limited to 'modules/pam_timestamp/hmac_openssl_wrapper.c')
| -rw-r--r-- | modules/pam_timestamp/hmac_openssl_wrapper.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/modules/pam_timestamp/hmac_openssl_wrapper.c b/modules/pam_timestamp/hmac_openssl_wrapper.c index a633a2bf..bf0f6e9c 100644 --- a/modules/pam_timestamp/hmac_openssl_wrapper.c +++ b/modules/pam_timestamp/hmac_openssl_wrapper.c @@ -56,6 +56,10 @@ #include "hmac_openssl_wrapper.h" #include "pam_inline.h" +#ifdef HAVE_SYS_RANDOM_H +#include <sys/random.h> +#endif + #define LOGIN_DEFS "/etc/login.defs" #define CRYPTO_KEY "HMAC_CRYPTO_ALGO" #define DEFAULT_ALGORITHM "SHA512" @@ -94,6 +98,15 @@ generate_key(pam_handle_t *pamh, char **key, size_t key_size) return PAM_AUTH_ERR; } +#ifdef HAVE_GETRANDOM + /* Fallback to getrandom(2) if available */ + if (getrandom(tmp, key_size, 0) == (ssize_t)key_size) { + *key = tmp; + return PAM_SUCCESS; + } +#endif + + /* Fallback to /dev/urandom */ fd = open("/dev/urandom", O_RDONLY); if (fd == -1) { pam_syslog(pamh, LOG_ERR, "Cannot open /dev/urandom: %m"); |