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For full Linux-PAM compatibility, add a trailing NUL character when

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passing the authentication token to the external program.

Approved by:	re (kib)
Submitted by:	Thomas Munro <munro@ip9.org>
MFC after:	1 week
Differential Revision:	D16950
This commit is contained in:
Dag-Erling Smørgrav 2018-09-04 10:51:41 +00:00
parent ec86402ecd
commit e165d7bc39
2 changed files with 4 additions and 2 deletions
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3
lib/libpam/modules/pam_exec/pam_exec.8
View File

@ -74,7 +74,8 @@ Ignored for compatibility reasons.
Use the program exit status as the return code of the pam_sm_* function.
It must be a valid return value for this function.
.It Cm expose_authtok
Write the authentication token to the program's standard input stream.
Write the authentication token to the program's standard input stream,
followed by a NUL character.
.It Cm --
Stop options parsing;
program and its arguments follow.

3
lib/libpam/modules/pam_exec/pam_exec.c
View File

@ -254,7 +254,8 @@ _pam_exec(pam_handle_t *pamh,
}
rc = pam_get_authtok(pamh, PAM_AUTHTOK, &authtok, NULL);
if (rc == PAM_SUCCESS) {
authtok_size = strlen(authtok);
/* We include the trailing NUL-terminator. */
authtok_size = strlen(authtok) + 1;
} else {
openpam_log(PAM_LOG_ERROR, "%s: pam_get_authtok(): %s", func,
pam_strerror(pamh, rc));