From 0f94f224f16f196d8d3fb56cfcf4a65bdd0f20c7 Mon Sep 17 00:00:00 2001 From: Greg Hudson Date: Thu, 22 Mar 2018 20:07:17 -0400 Subject: [PATCH] Return UPN SANs as strings (cherry picked from commit fd3c824e3be56a1fa77d140fd7e93934bfd6e565) --- src/plugins/preauth/pkinit/pkinit_crypto.h | 4 +-- .../preauth/pkinit/pkinit_crypto_openssl.c | 28 +++++++------------ src/plugins/preauth/pkinit/pkinit_matching.c | 16 ++--------- src/plugins/preauth/pkinit/pkinit_srv.c | 21 +++++++++----- 4 files changed, 29 insertions(+), 40 deletions(-) diff --git a/src/plugins/preauth/pkinit/pkinit_crypto.h b/src/plugins/preauth/pkinit/pkinit_crypto.h index c14f4456a..b6e4e0ac3 100644 --- a/src/plugins/preauth/pkinit/pkinit_crypto.h +++ b/src/plugins/preauth/pkinit/pkinit_crypto.h @@ -101,7 +101,7 @@ typedef struct _pkinit_cert_matching_data { unsigned int ku_bits; /* key usage information */ unsigned int eku_bits; /* extended key usage information */ krb5_principal *sans; /* Null-terminated array of PKINIT SANs */ - krb5_principal *upns; /* Null-terimnated array of UPN SANs */ + char **upns; /* Null-terimnated array of UPN SANs */ } pkinit_cert_matching_data; /* @@ -253,7 +253,7 @@ krb5_error_code crypto_retrieve_cert_sans if non-NULL, a null-terminated array of id-pkinit-san values found in the certificate are returned */ - krb5_principal **upn_sans, /* OUT + char ***upn_sans, /* OUT if non-NULL, a null-terminated array of id-ms-upn-san values found in the certificate are returned */ diff --git a/src/plugins/preauth/pkinit/pkinit_crypto_openssl.c b/src/plugins/preauth/pkinit/pkinit_crypto_openssl.c index cf2f16294..3949eb9c2 100644 --- a/src/plugins/preauth/pkinit/pkinit_crypto_openssl.c +++ b/src/plugins/preauth/pkinit/pkinit_crypto_openssl.c @@ -29,6 +29,7 @@ * SUCH DAMAGES. */ +#include "k5-int.h" #include "pkinit_crypto_openssl.h" #include "k5-buf.h" #include @@ -2095,15 +2096,14 @@ crypto_retrieve_X509_sans(krb5_context context, pkinit_plg_crypto_context plgctx, pkinit_req_crypto_context reqctx, X509 *cert, - krb5_principal **princs_ret, - krb5_principal **upn_ret, + krb5_principal **princs_ret, char ***upn_ret, unsigned char ***dns_ret) { krb5_error_code retval = EINVAL; char buf[DN_BUF_LEN]; int p = 0, u = 0, d = 0, ret = 0, l; krb5_principal *princs = NULL; - krb5_principal *upns = NULL; + char **upns = NULL; unsigned char **dnss = NULL; unsigned int i, num_found = 0, num_sans = 0; X509_EXTENSION *ext = NULL; @@ -2153,7 +2153,7 @@ crypto_retrieve_X509_sans(krb5_context context, } } if (upn_ret != NULL) { - upns = calloc(num_sans + 1, sizeof(krb5_principal)); + upns = calloc(num_sans + 1, sizeof(*upns)); if (upns == NULL) { retval = ENOMEM; goto cleanup; @@ -2196,16 +2196,9 @@ crypto_retrieve_X509_sans(krb5_context context, /* Prevent abuse of embedded null characters. */ if (memchr(name.data, '\0', name.length)) break; - ret = krb5_parse_name_flags(context, name.data, - KRB5_PRINCIPAL_PARSE_ENTERPRISE, - &upns[u]); - if (ret) { - pkiDebug("%s: failed parsing ms-upn san value\n", - __FUNCTION__); - } else { - u++; - num_found++; - } + upns[u] = k5memdup0(name.data, name.length, &ret); + if (upns[u] == NULL) + goto cleanup; } else { pkiDebug("%s: unrecognized othername oid in SAN\n", __FUNCTION__); @@ -2257,7 +2250,7 @@ cleanup: krb5_free_principal(context, princs[i]); free(princs); for (i = 0; upns != NULL && upns[i] != NULL; i++) - krb5_free_principal(context, upns[i]); + free(upns[i]); free(upns); for (i = 0; dnss != NULL && dnss[i] != NULL; i++) free(dnss[i]); @@ -2281,8 +2274,7 @@ crypto_retrieve_cert_sans(krb5_context context, pkinit_plg_crypto_context plgctx, pkinit_req_crypto_context reqctx, pkinit_identity_crypto_context idctx, - krb5_principal **princs_ret, - krb5_principal **upn_ret, + krb5_principal **princs_ret, char ***upn_ret, unsigned char ***dns_ret) { krb5_error_code retval = EINVAL; @@ -5111,7 +5103,7 @@ crypto_cert_free_matching_data(krb5_context context, krb5_free_principal(context, md->sans[i]); free(md->sans); for (i = 0; md->upns != NULL && md->upns[i] != NULL; i++) - krb5_free_principal(context, md->upns[i]); + free(md->upns[i]); free(md->upns); free(md); } diff --git a/src/plugins/preauth/pkinit/pkinit_matching.c b/src/plugins/preauth/pkinit/pkinit_matching.c index fe1e0f386..d929fb3c0 100644 --- a/src/plugins/preauth/pkinit/pkinit_matching.c +++ b/src/plugins/preauth/pkinit/pkinit_matching.c @@ -490,11 +490,7 @@ component_match(krb5_context context, break; } for (i = 0; md->upns != NULL && md->upns[i] != NULL; i++) { - krb5_unparse_name_flags(context, md->upns[i], - KRB5_PRINCIPAL_UNPARSE_NO_REALM, - &princ_string); - match = regexp_match(context, rc, princ_string); - krb5_free_unparsed_name(context, princ_string); + match = regexp_match(context, rc, md->upns[i]); if (match) break; } @@ -584,14 +580,8 @@ check_all_certs(krb5_context context, pkiDebug("%s: PKINIT san: '%s'\n", __FUNCTION__, san_string); krb5_free_unparsed_name(context, san_string); } - for (j = 0; md->upns != NULL && md->upns[j] != NULL; j++) { - char *san_string; - krb5_unparse_name_flags(context, md->upns[j], - KRB5_PRINCIPAL_UNPARSE_NO_REALM, - &san_string); - pkiDebug("%s: UPN san: '%s'\n", __FUNCTION__, san_string); - krb5_free_unparsed_name(context, san_string); - } + for (j = 0; md->upns != NULL && md->upns[j] != NULL; j++) + pkiDebug("%s: UPN san: '%s'\n", __FUNCTION__, md->upns[j]); #endif certs_checked++; for (rc = rs->crs; rc != NULL; rc = rc->next) { diff --git a/src/plugins/preauth/pkinit/pkinit_srv.c b/src/plugins/preauth/pkinit/pkinit_srv.c index 143d331a2..42ad45fe4 100644 --- a/src/plugins/preauth/pkinit/pkinit_srv.c +++ b/src/plugins/preauth/pkinit/pkinit_srv.c @@ -174,8 +174,9 @@ verify_client_san(krb5_context context, int *valid_san) { krb5_error_code retval; - krb5_principal *princs = NULL; - krb5_principal *upns = NULL; + krb5_principal *princs = NULL, upn; + krb5_boolean match; + char **upns = NULL; int i; #ifdef DEBUG_SAN_INFO char *client_string = NULL, *san_string; @@ -251,12 +252,18 @@ verify_client_san(krb5_context context, pkiDebug("%s: Checking upn sans\n", __FUNCTION__); for (i = 0; upns[i] != NULL; i++) { #ifdef DEBUG_SAN_INFO - krb5_unparse_name(context, upns[i], &san_string); pkiDebug("%s: Comparing client '%s' to upn san value '%s'\n", - __FUNCTION__, client_string, san_string); - krb5_free_unparsed_name(context, san_string); + __FUNCTION__, client_string, upns[i]); #endif - if (cb->match_client(context, rock, upns[i])) { + retval = krb5_parse_name_flags(context, upns[i], + KRB5_PRINCIPAL_PARSE_ENTERPRISE, &upn); + if (retval) { + /* XXX trace */ + continue; + } + match = cb->match_client(context, rock, upn); + krb5_free_principal(context, upn); + if (match) { TRACE_PKINIT_SERVER_MATCHING_UPN_FOUND(context); *valid_san = 1; retval = 0; @@ -282,7 +289,7 @@ out: } if (upns != NULL) { for (i = 0; upns[i] != NULL; i++) - krb5_free_principal(context, upns[i]); + free(upns[i]); free(upns); } #ifdef DEBUG_SAN_INFO