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Better token parsing in authorized_yubikeys file (check_user_token) #244

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Better token parsing in authorized_yubikeys file (check_user_token) #244

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59d1efd
added better user parsing and better buffered token parsing
Wicwik Nov 30, 2022
1b809c2
tests passing
Wicwik Nov 30, 2022
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20 changes: 19 additions & 1 deletion util.c
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Original file line number Diff line number Diff line change
Expand Up @@ -335,12 +335,16 @@ check_user_token (const char *authfile,
return retval;
}

s_user = NULL;
retval = AUTH_NO_TOKENS;
while (fgets (buf, 1024, opwfile))
{
char *saveptr = NULL;
if (buf[strlen (buf) - 1] == '\n')
{
s_user = NULL;
buf[strlen (buf) - 1] = '\0';
}
if (buf[0] == '#') {
/* This is a comment and we may skip it. */
if(verbose)
Expand All @@ -349,7 +353,12 @@ check_user_token (const char *authfile,
}
if(verbose)
D (debug_file, "Authorization line: %s", buf);
s_user = strtok_r (buf, ":", &saveptr);
/* Only get user token if it's not defined. */
if (s_user == NULL)
s_user = strtok_r (buf, ":", &saveptr);
else
/* If the user is already set, we need to set the savedptr to our current buffer */
saveptr = buf;
if (s_user && strcmp (username, s_user) == 0)
{
if(verbose)
Expand All @@ -358,6 +367,15 @@ check_user_token (const char *authfile,
do
{
s_token = strtok_r (NULL, ":", &saveptr);

/* If the last token was less then 12 bytes */
if (s_token != NULL && strlen(s_token) < 12 && saveptr == NULL)
{
/* move the file pointer back to the beggining of the token, so it can be read next time */
fseek(opwfile, ftell(opwfile) - strlen(s_token), SEEK_SET);
continue;
}

if(verbose)
D (debug_file, "Authorization token: %s", s_token);
if (s_token && otp_id && strcmp (otp_id, s_token) == 0)
Expand Down