/* GSSAPI/krb5 support for FTP - loosely based on old krb4.c
*
- * Copyright (c) 1995, 1996, 1997, 1998, 1999 Kungliga Tekniska Högskolan
+ * Copyright (c) 1995, 1996, 1997, 1998, 1999, 2013 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
+ * Copyright (c) 2004 - 2015 Daniel Stenberg
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE. */
-#include "setup.h"
+#include "curl_setup.h"
-#ifndef CURL_DISABLE_FTP
-#ifdef HAVE_GSSAPI
+#if defined(HAVE_GSSAPI) && !defined(CURL_DISABLE_FTP)
-#ifdef HAVE_GSSMIT
-#define GSS_C_NT_HOSTBASED_SERVICE gss_nt_service_name
-#endif
-
-#include <stdlib.h>
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
-#include <string.h>
-#ifdef HAVE_GSSMIT
-/* MIT style */
-#include <gssapi/gssapi.h>
-#include <gssapi/gssapi_generic.h>
-#include <gssapi/gssapi_krb5.h>
-#else
-/* Heimdal-style */
-#include <gssapi.h>
-#endif
#include "urldata.h"
-#include "base64.h"
+#include "curl_base64.h"
#include "ftp.h"
+#include "curl_gssapi.h"
#include "sendf.h"
-#include "krb4.h"
-#include "memory.h"
+#include "curl_sec.h"
+#include "curl_memory.h"
+#include "warnless.h"
+
+#define _MPRINTF_REPLACE /* use our functions only */
+#include <curl/mprintf.h>
/* The last #include file should be: */
#include "memdebug.h"
#define REMOTE_ADDR conn->ip_addr->ai_addr
static int
+krb5_init(void *app_data)
+{
+ gss_ctx_id_t *context = app_data;
+ /* Make sure our context is initialized for krb5_end. */
+ *context = GSS_C_NO_CONTEXT;
+ return 0;
+}
+
+static int
krb5_check_prot(void *app_data, int level)
{
- app_data = NULL; /* prevent compiler warning */
- if(level == prot_confidential)
+ (void)app_data; /* unused */
+ if(level == PROT_CONFIDENTIAL)
return -1;
return 0;
}
static int
-krb5_decode(void *app_data, void *buf, int len, int level,
- struct connectdata *conn)
+krb5_decode(void *app_data, void *buf, int len,
+ int level UNUSED_PARAM,
+ struct connectdata *conn UNUSED_PARAM)
{
gss_ctx_id_t *context = app_data;
OM_uint32 maj, min;
gss_buffer_desc enc, dec;
- /* shut gcc up */
- level = 0;
- conn = NULL;
+ (void)level;
+ (void)conn;
enc.value = buf;
enc.length = len;
}
memcpy(buf, dec.value, dec.length);
- len = dec.length;
+ len = curlx_uztosi(dec.length);
gss_release_buffer(&min, &dec);
return len;
static int
krb5_overhead(void *app_data, int level, int len)
{
- /* no arguments are used, just init them to prevent compiler warnings */
- app_data = NULL;
- level = 0;
- len = 0;
+ /* no arguments are used */
+ (void)app_data;
+ (void)level;
+ (void)len;
return 0;
}
static int
-krb5_encode(void *app_data, void *from, int length, int level, void **to,
- struct connectdata *conn)
+krb5_encode(void *app_data, const void *from, int length, int level, void **to)
{
gss_ctx_id_t *context = app_data;
gss_buffer_desc dec, enc;
int state;
int len;
- /* shut gcc up */
- conn = NULL;
-
- dec.value = from;
+ /* NOTE that the cast is safe, neither of the krb5, gnu gss and heimdal
+ * libraries modify the input buffer in gss_seal()
+ */
+ dec.value = (void*)from;
dec.length = length;
maj = gss_seal(&min, *context,
- level == prot_private,
- GSS_C_QOP_DEFAULT,
- &dec, &state, &enc);
+ level == PROT_PRIVATE,
+ GSS_C_QOP_DEFAULT,
+ &dec, &state, &enc);
if(maj != GSS_S_COMPLETE)
return -1;
- /* malloc a new buffer, in case gss_release_buffer doesn't work as expected */
+ /* malloc a new buffer, in case gss_release_buffer doesn't work as
+ expected */
*to = malloc(enc.length);
if(!*to)
return -1;
memcpy(*to, enc.value, enc.length);
- len = enc.length;
+ len = curlx_uztosi(enc.length);
gss_release_buffer(&min, &enc);
return len;
}
static int
krb5_auth(void *app_data, struct connectdata *conn)
{
- int ret;
+ int ret = AUTH_OK;
char *p;
- const char *host = conn->dns_entry->addr->ai_canonname;
+ const char *host = conn->host.name;
ssize_t nread;
- socklen_t l = sizeof(conn->local_addr);
+ curl_socklen_t l = sizeof(conn->local_addr);
struct SessionHandle *data = conn->data;
CURLcode result;
const char *service = "ftp", *srv_host = "host";
- gss_buffer_desc gssbuf, _gssresp, *gssresp;
+ gss_buffer_desc input_buffer, output_buffer, _gssresp, *gssresp;
OM_uint32 maj, min;
gss_name_t gssname;
gss_ctx_id_t *context = app_data;
struct gss_channel_bindings_struct chan;
+ size_t base64_sz = 0;
if(getsockname(conn->sock[FIRSTSOCKET],
(struct sockaddr *)LOCAL_ADDR, &l) < 0)
chan.initiator_addrtype = GSS_C_AF_INET;
chan.initiator_address.length = l - 4;
- chan.initiator_address.value = &((struct sockaddr_in *)LOCAL_ADDR)->sin_addr.s_addr;
+ chan.initiator_address.value =
+ &((struct sockaddr_in *)LOCAL_ADDR)->sin_addr.s_addr;
chan.acceptor_addrtype = GSS_C_AF_INET;
chan.acceptor_address.length = l - 4;
- chan.acceptor_address.value = &((struct sockaddr_in *)REMOTE_ADDR)->sin_addr.s_addr;
+ chan.acceptor_address.value =
+ &((struct sockaddr_in *)REMOTE_ADDR)->sin_addr.s_addr;
chan.application_data.length = 0;
chan.application_data.value = NULL;
/* this loop will execute twice (once for service, once for host) */
- while(1) {
+ for(;;) {
/* this really shouldn't be repeated here, but can't help it */
if(service == srv_host) {
result = Curl_ftpsendf(conn, "AUTH GSSAPI");
if(result)
- return -2;
+ return -2;
if(Curl_GetFTPResponse(&nread, conn, NULL))
- return -1;
+ return -1;
if(data->state.buffer[0] != '3')
- return -1;
+ return -1;
}
- gssbuf.value = data->state.buffer;
- gssbuf.length = snprintf(gssbuf.value, BUFSIZE, "%s@%s", service, host);
- maj = gss_import_name(&min, &gssbuf, GSS_C_NT_HOSTBASED_SERVICE, &gssname);
+ input_buffer.value = data->state.buffer;
+ input_buffer.length = snprintf(input_buffer.value, BUFSIZE, "%s@%s",
+ service, host);
+ maj = gss_import_name(&min, &input_buffer, GSS_C_NT_HOSTBASED_SERVICE,
+ &gssname);
if(maj != GSS_S_COMPLETE) {
gss_release_name(&min, &gssname);
if(service == srv_host) {
- Curl_failf(data, "Error importing service name %s", gssbuf.value);
- return AUTH_ERROR;
+ Curl_failf(data, "Error importing service name %s",
+ input_buffer.value);
+ return AUTH_ERROR;
}
service = srv_host;
continue;
}
- {
- gss_OID t;
- gss_display_name(&min, gssname, &gssbuf, &t);
- Curl_infof(data, "Trying against %s\n", gssbuf.value);
- gss_release_buffer(&min, &gssbuf);
- }
+ /* We pass NULL as |output_name_type| to avoid a leak. */
+ gss_display_name(&min, gssname, &output_buffer, NULL);
+ Curl_infof(data, "Trying against %s\n", output_buffer.value);
gssresp = GSS_C_NO_BUFFER;
*context = GSS_C_NO_CONTEXT;
do {
+ /* Release the buffer at each iteration to avoid leaking: the first time
+ we are releasing the memory from gss_display_name. The last item is
+ taken care by a final gss_release_buffer. */
+ gss_release_buffer(&min, &output_buffer);
ret = AUTH_OK;
- maj = gss_init_sec_context(&min,
- GSS_C_NO_CREDENTIAL,
- context,
- gssname,
- GSS_C_NO_OID,
- GSS_C_MUTUAL_FLAG | GSS_C_REPLAY_FLAG,
- 0,
- &chan,
- gssresp,
- NULL,
- &gssbuf,
- NULL,
- NULL);
+ maj = Curl_gss_init_sec_context(data,
+ &min,
+ context,
+ gssname,
+ &Curl_krb5_mech_oid,
+ &chan,
+ gssresp,
+ &output_buffer,
+ TRUE,
+ NULL);
if(gssresp) {
- free(_gssresp.value);
- gssresp = NULL;
+ free(_gssresp.value);
+ gssresp = NULL;
}
- if(maj != GSS_S_COMPLETE && maj != GSS_S_CONTINUE_NEEDED) {
- Curl_infof(data, "Error creating security context");
- ret = AUTH_ERROR;
- break;
+ if(GSS_ERROR(maj)) {
+ Curl_infof(data, "Error creating security context\n");
+ ret = AUTH_ERROR;
+ break;
}
- if(gssbuf.length != 0) {
- if(Curl_base64_encode(data, (char *)gssbuf.value, gssbuf.length, &p) < 1) {
- Curl_infof(data, "Out of memory base64-encoding");
- ret = AUTH_CONTINUE;
- break;
- }
-
- result = Curl_ftpsendf(conn, "ADAT %s", p);
-
- free(p);
-
- if(result) {
- ret = -2;
- break;
- }
-
- if(Curl_GetFTPResponse(&nread, conn, NULL)) {
- ret = -1;
- break;
- }
-
- if(data->state.buffer[0] != '2' && data->state.buffer[0] != '3'){
- Curl_infof(data, "Server didn't accept auth data\n");
- ret = AUTH_ERROR;
- break;
- }
-
- p = data->state.buffer + 4;
- p = strstr(p, "ADAT=");
- if(p) {
- _gssresp.length = Curl_base64_decode(p + 5, (unsigned char **)&_gssresp.value);
- if(_gssresp.length < 1) {
- Curl_failf(data, "Out of memory base64-encoding");
- ret = AUTH_CONTINUE;
- break;
- }
- }
-
- gssresp = &_gssresp;
+ if(output_buffer.length != 0) {
+ result = Curl_base64_encode(data, (char *)output_buffer.value,
+ output_buffer.length, &p, &base64_sz);
+ if(result) {
+ Curl_infof(data,"base64-encoding: %s\n", curl_easy_strerror(result));
+ ret = AUTH_CONTINUE;
+ break;
+ }
+
+ result = Curl_ftpsendf(conn, "ADAT %s", p);
+
+ free(p);
+
+ if(result) {
+ ret = -2;
+ break;
+ }
+
+ if(Curl_GetFTPResponse(&nread, conn, NULL)) {
+ ret = -1;
+ break;
+ }
+
+ if(data->state.buffer[0] != '2' && data->state.buffer[0] != '3') {
+ Curl_infof(data, "Server didn't accept auth data\n");
+ ret = AUTH_ERROR;
+ break;
+ }
+
+ p = data->state.buffer + 4;
+ p = strstr(p, "ADAT=");
+ if(p) {
+ result = Curl_base64_decode(p + 5,
+ (unsigned char **)&_gssresp.value,
+ &_gssresp.length);
+ if(result) {
+ Curl_failf(data,"base64-decoding: %s", curl_easy_strerror(result));
+ ret = AUTH_CONTINUE;
+ break;
+ }
+ }
+
+ gssresp = &_gssresp;
}
} while(maj == GSS_S_CONTINUE_NEEDED);
gss_release_name(&min, &gssname);
+ gss_release_buffer(&min, &output_buffer);
if(gssresp)
free(_gssresp.value);
service = srv_host;
}
+ return ret;
+}
+
+static void krb5_end(void *app_data)
+{
+ OM_uint32 min;
+ gss_ctx_id_t *context = app_data;
+ if(*context != GSS_C_NO_CONTEXT) {
+#ifdef DEBUGBUILD
+ OM_uint32 maj =
+#endif
+ gss_delete_sec_context(&min, context, GSS_C_NO_BUFFER);
+ DEBUGASSERT(maj == GSS_S_COMPLETE);
+ }
}
struct Curl_sec_client_mech Curl_krb5_client_mech = {
"GSSAPI",
sizeof(gss_ctx_id_t),
- NULL, /* init */
+ krb5_init,
krb5_auth,
- NULL, /* end */
+ krb5_end,
krb5_check_prot,
krb5_overhead,
krb5_encode,
krb5_decode
};
-#endif /* HAVE_GSSAPI */
-#endif /* CURL_DISABLE_FTP */
+#endif /* HAVE_GSSAPI && !CURL_DISABLE_FTP */
projects / platform / upstream / curl.git / blobdiff