git.distorted.org.uk Git - u/mdw/putty/blob - unix/uxgss.c

   1 #include "putty.h"
   2 #ifndef NO_GSSAPI
   3 #include "pgssapi.h"
   4 #include "sshgss.h"
   5 #include "sshgssc.h"
   6
   7 /* Unix code to set up the GSSAPI library list. */
   8
   9 struct ssh_gss_library ssh_gss_libraries[3];
  10 int n_ssh_gss_libraries = 0;
  11 static int initialised = FALSE;
  12
  13 const int ngsslibs = 3;
  14 const char *const gsslibnames[3] = {
  15     "libgssapi (Heimdal)",
  16     "libgssapi_krb5 (MIT Kerberos)",
  17     "libgss (Sun)",
  18 };
  19 const struct keyval gsslibkeywords[] = {
  20     { "libgssapi", 0 },
  21     { "libgssapi_krb5", 1 },
  22     { "libgss", 2 },
  23 };
  24
  25 #ifndef NO_LIBDL
  26
  27 /*
  28  * Run-time binding against a choice of GSSAPI implementations. We
  29  * try loading several libraries, and produce an entry in
  30  * ssh_gss_libraries[] for each one.
  31  */
  32
  33 static void gss_init(struct ssh_gss_library *lib, void *dlhandle,
  34                      int id, const char *msg)
  35 {
  36     lib->id = id;
  37     lib->gsslogmsg = msg;
  38
  39 #define BIND_GSS_FN(name) \
  40     lib->u.gssapi.name = (t_gss_##name) dlsym(dlhandle, "gss_" #name)
  41
  42     BIND_GSS_FN(delete_sec_context);
  43     BIND_GSS_FN(display_status);
  44     BIND_GSS_FN(get_mic);
  45     BIND_GSS_FN(import_name);
  46     BIND_GSS_FN(init_sec_context);
  47     BIND_GSS_FN(release_buffer);
  48     BIND_GSS_FN(release_cred);
  49     BIND_GSS_FN(release_name);
  50
  51 #undef BIND_GSS_FN
  52
  53     ssh_gssapi_bind_fns(lib);
  54 }
  55
  56 /* Dynamically load gssapi libs. */
  57 void ssh_gss_init(void)
  58 {
  59     void *gsslib;
  60
  61     if (initialised) return;
  62     initialised = TRUE;
  63
  64     /* Heimdal's GSSAPI Library */
  65     if ((gsslib = dlopen("libgssapi.so.2", RTLD_LAZY)) != NULL)
  66         gss_init(&ssh_gss_libraries[n_ssh_gss_libraries++], gsslib,
  67                  0, "Using GSSAPI from libgssapi.so.2");
  68
  69     /* MIT Kerberos's GSSAPI Library */
  70     if ((gsslib = dlopen("libgssapi_krb5.so.2", RTLD_LAZY)) != NULL)
  71         gss_init(&ssh_gss_libraries[n_ssh_gss_libraries++], gsslib,
  72                  1, "Using GSSAPI from libgssapi_krb5.so.2");
  73
  74     /* Sun's GSSAPI Library */
  75     if ((gsslib = dlopen("libgss.so.1", RTLD_LAZY)) != NULL)
  76         gss_init(&ssh_gss_libraries[n_ssh_gss_libraries++], gsslib,
  77                  2, "Using GSSAPI from libgss.so.1");
  78 }
  79
  80 #else /* NO_LIBDL */
  81
  82 /*
  83  * Link-time binding against GSSAPI. Here we just construct a single
  84  * library structure containing pointers to the functions we linked
  85  * against.
  86  */
  87
  88 #include <gssapi/gssapi.h>
  89
  90 /* Dynamically load gssapi libs. */
  91 void ssh_gss_init(void)
  92 {
  93     if (initialised) return;
  94     initialised = TRUE;
  95
  96     n_ssh_gss_libraries = 1;
  97     ssh_gss_libraries[0].gsslogmsg = "Using statically linked GSSAPI";
  98
  99 #define BIND_GSS_FN(name) \
 100     ssh_gss_libraries[0].u.gssapi.name = (t_gss_##name) gss_##name
 101
 102     BIND_GSS_FN(delete_sec_context);
 103     BIND_GSS_FN(display_status);
 104     BIND_GSS_FN(get_mic);
 105     BIND_GSS_FN(import_name);
 106     BIND_GSS_FN(init_sec_context);
 107     BIND_GSS_FN(release_buffer);
 108     BIND_GSS_FN(release_cred);
 109     BIND_GSS_FN(release_name);
 110
 111 #undef BIND_GSS_FN
 112
 113     ssh_gssapi_bind_fns(&ssh_gss_libraries[0]);
 114 }
 115
 116 #endif /* NO_LIBDL */
 117
 118 #endif /* NO_GSSAPI */