Flawfinder version 2.0.10, (C) 2001-2019 David A. Wheeler.
Number of rules (primarily dangerous function names) in C/C++ ruleset: 223
Examining data/libapache2-mod-authn-yubikey-1.0/libykclient.c
Examining data/libapache2-mod-authn-yubikey-1.0/libykclient.h
Examining data/libapache2-mod-authn-yubikey-1.0/mod_authn_yubikey.c

FINAL RESULTS:

data/libapache2-mod-authn-yubikey-1.0/libykclient.c:45:5:  [4] (format) printf:
  If format strings can be influenced by an attacker, they can be exploited
  (CWE-134). Use a constant for the format specification.
    printf x;								\
data/libapache2-mod-authn-yubikey-1.0/libykclient.c:191:7:  [2] (buffer) memcpy:
  Does not check for buffer overflows when copying to destination (CWE-120).
  Make sure destination can always hold the source data.
      memcpy(&(mem->memory[mem->size]), ptr, realsize);
data/libapache2-mod-authn-yubikey-1.0/mod_authn_yubikey.c:208:5:  [2] (buffer) char:
  Statically-sized arrays can be improperly restricted, leading to potential
  overflows or other issues (CWE-119!/CWE-120). Perform bounds checking, use
  functions that limit length, or ensure that the size is larger than the
  maximum possible length.
    char l[MAX_STRING_LEN];
data/libapache2-mod-authn-yubikey-1.0/mod_authn_yubikey.c:495:5:  [2] (buffer) char:
  Statically-sized arrays can be improperly restricted, leading to potential
  overflows or other issues (CWE-119!/CWE-120). Perform bounds checking, use
  functions that limit length, or ensure that the size is larger than the
  maximum possible length.
    char l[MAX_STRING_LEN];
data/libapache2-mod-authn-yubikey-1.0/mod_authn_yubikey.c:512:7:  [2] (buffer) char:
  Statically-sized arrays can be improperly restricted, leading to potential
  overflows or other issues (CWE-119!/CWE-120). Perform bounds checking, use
  functions that limit length, or ensure that the size is larger than the
  maximum possible length.
      char buffer[1024];
data/libapache2-mod-authn-yubikey-1.0/libykclient.c:247:17:  [1] (buffer) strlen:
  Does not handle strings that are not \0-terminated; if given one it may
  perform an over-read (it could cause a crash if unprotected) (CWE-126).
  while (status[strlen (status) - 1] == '\r'
data/libapache2-mod-authn-yubikey-1.0/libykclient.c:248:13:  [1] (buffer) strlen:
  Does not handle strings that are not \0-terminated; if given one it may
  perform an over-read (it could cause a crash if unprotected) (CWE-126).
	 || status[strlen (status) - 1] == '\n')
data/libapache2-mod-authn-yubikey-1.0/libykclient.c:249:12:  [1] (buffer) strlen:
  Does not handle strings that are not \0-terminated; if given one it may
  perform an over-read (it could cause a crash if unprotected) (CWE-126).
    status[strlen (status) - 1] = '\0';
data/libapache2-mod-authn-yubikey-1.0/libykclient.c:251:35:  [1] (buffer) strlen:
  Does not handle strings that are not \0-terminated; if given one it may
  perform an over-read (it could cause a crash if unprotected) (CWE-126).
  D (("parsed status (%d): %s\n", strlen (status), status));
data/libapache2-mod-authn-yubikey-1.0/mod_authn_yubikey.c:114:16:  [1] (buffer) strlen:
  Does not handle strings that are not \0-terminated; if given one it may
  perform an over-read (it could cause a crash if unprotected) (CWE-126).
    dt.dsize = strlen(dt.dptr);
data/libapache2-mod-authn-yubikey-1.0/mod_authn_yubikey.c:116:16:  [1] (buffer) strlen:
  Does not handle strings that are not \0-terminated; if given one it may
  perform an over-read (it could cause a crash if unprotected) (CWE-126).
    dt.dsize = strlen(dt.dptr) + 1;
data/libapache2-mod-authn-yubikey-1.0/mod_authn_yubikey.c:234:9:  [1] (buffer) strlen:
  Does not handle strings that are not \0-terminated; if given one it may
  perform an over-read (it could cause a crash if unprotected) (CWE-126).
    if (strlen(password) < YUBIKEY_TOKEN_LENGTH) {
data/libapache2-mod-authn-yubikey-1.0/mod_authn_yubikey.c:246:35:  [1] (buffer) strlen:
  Does not handle strings that are not \0-terminated; if given one it may
  perform an over-read (it could cause a crash if unprotected) (CWE-126).
    passwordLength = (apr_size_t) strlen(password) - YUBIKEY_TOKEN_LENGTH;
data/libapache2-mod-authn-yubikey-1.0/mod_authn_yubikey.c:254:9:  [1] (buffer) strlen:
  Does not handle strings that are not \0-terminated; if given one it may
  perform an over-read (it could cause a crash if unprotected) (CWE-126).
    if (strlen(password) > YUBIKEY_TOKEN_LENGTH) {
data/libapache2-mod-authn-yubikey-1.0/mod_authn_yubikey.c:376:35:  [1] (buffer) strlen:
  Does not handle strings that are not \0-terminated; if given one it may
  perform an over-read (it could cause a crash if unprotected) (CWE-126).
    passwordLength = (apr_size_t) strlen(password) - YUBIKEY_TOKEN_LENGTH;

ANALYSIS SUMMARY:

Hits = 15
Lines analyzed = 1073 in approximately 0.05 seconds (19621 lines/second)
Physical Source Lines of Code (SLOC) = 701
Hits@level = [0]   1 [1]  10 [2]   4 [3]   0 [4]   1 [5]   0
Hits@level+ = [0+]  16 [1+]  15 [2+]   5 [3+]   1 [4+]   1 [5+]   0
Hits/KSLOC@level+ = [0+] 22.8245 [1+] 21.398 [2+] 7.13267 [3+] 1.42653 [4+] 1.42653 [5+]   0
Dot directories skipped = 1 (--followdotdir overrides)
Minimum risk level = 1
Not every hit is necessarily a security vulnerability.
There may be other security vulnerabilities; review your code!
See 'Secure Programming HOWTO'
(https://dwheeler.com/secure-programs) for more information.