From f4e0ad82b0eaccce965074c1ceec2b7e3853dc0d Mon Sep 17 00:00:00 2001 From: Andris Kalnozols Date: Sat, 28 Jun 2014 19:41:02 +0200 Subject: Do not upcase x509-username-field for mixed-case arguments. I revisited options.c to refine its brute-force upcasing behavior. Now, the upcasing is done only if the option argument is all lowercase. Mixed-case arguments and those with the "ext:" prefix are left unchanged. This preserves the original intent of the "helpful" upcasing feature for backwards compatibility while limiting its scope in a straightforward way. Signed-off-by: Andris Kalnozols Signed-off-by: Steffan Karger Acked-by: Arne Schwabe Message-Id: <53B1BDD8.8020705@karger.me> Signed-off-by: Gert Doering --- src/openvpn/options.c | 26 ++++++++++++++++++++++---- 1 file changed, 22 insertions(+), 4 deletions(-) (limited to 'src/openvpn/options.c') diff --git a/src/openvpn/options.c b/src/openvpn/options.c index 206a091..fd486b9 100644 --- a/src/openvpn/options.c +++ b/src/openvpn/options.c @@ -585,8 +585,8 @@ static const char usage_message[] = " and optionally the root CA certificate.\n" #endif #ifdef ENABLE_X509ALTUSERNAME - "--x509-username-field : Field used in x509 certificate to be username.\n" - " Default is CN.\n" + "--x509-username-field : Field in x509 certificate containing the username.\n" + " Default is CN in the Subject field.\n" #endif "--verify-hash : Specify SHA1 fingerprint for level-1 cert.\n" #ifdef WIN32 @@ -6912,10 +6912,28 @@ add_option (struct options *options, #ifdef ENABLE_X509ALTUSERNAME else if (streq (p[0], "x509-username-field") && p[1]) { + /* This option used to automatically upcase the fieldname passed as the + * option argument, e.g., "ou" became "OU". Now, this "helpfulness" is + * fine-tuned by only upcasing Subject field attribute names which consist + * of all lower-case characters. Mixed-case attributes such as + * "emailAddress" are left as-is. An option parameter having the "ext:" + * prefix for matching X.509v3 extended fields will also remain unchanged. + */ char *s = p[1]; + VERIFY_PERMISSION (OPT_P_GENERAL); - if( strncmp ("ext:",s,4) != 0 ) - while ((*s = toupper(*s)) != '\0') s++; /* Uppercase if necessary */ + if (strncmp("ext:", s, 4) != 0) + { + size_t i = 0; + while (s[i] && !isupper(s[i])) i++; + if (strlen(s) == i) + { + while ((*s = toupper(*s)) != '\0') s++; + msg(M_WARN, "DEPRECATED FEATURE: automatically upcased the " + "--x509-username-field parameter to '%s'; please update your" + "configuration", p[1]); + } + } options->x509_username_field = p[1]; } #endif /* ENABLE_X509ALTUSERNAME */ -- cgit