| 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 | #if !defined NO_LIBDL && !defined NO_GSSAPI |
| 10 | |
| 11 | const int ngsslibs = 4; |
| 12 | const char *const gsslibnames[4] = { |
| 13 | "libgssapi (Heimdal)", |
| 14 | "libgssapi_krb5 (MIT Kerberos)", |
| 15 | "libgss (Sun)", |
| 16 | "User-specified GSSAPI library", |
| 17 | }; |
| 18 | const struct keyvalwhere gsslibkeywords[] = { |
| 19 | { "libgssapi", 0, -1, -1 }, |
| 20 | { "libgssapi_krb5", 1, -1, -1 }, |
| 21 | { "libgss", 2, -1, -1 }, |
| 22 | { "custom", 3, -1, -1 }, |
| 23 | }; |
| 24 | |
| 25 | /* |
| 26 | * Run-time binding against a choice of GSSAPI implementations. We |
| 27 | * try loading several libraries, and produce an entry in |
| 28 | * ssh_gss_libraries[] for each one. |
| 29 | */ |
| 30 | |
| 31 | static void gss_init(struct ssh_gss_library *lib, void *dlhandle, |
| 32 | int id, const char *msg) |
| 33 | { |
| 34 | lib->id = id; |
| 35 | lib->gsslogmsg = msg; |
| 36 | lib->handle = dlhandle; |
| 37 | |
| 38 | #define BIND_GSS_FN(name) \ |
| 39 | lib->u.gssapi.name = (t_gss_##name) dlsym(dlhandle, "gss_" #name) |
| 40 | |
| 41 | BIND_GSS_FN(delete_sec_context); |
| 42 | BIND_GSS_FN(display_status); |
| 43 | BIND_GSS_FN(get_mic); |
| 44 | BIND_GSS_FN(import_name); |
| 45 | BIND_GSS_FN(init_sec_context); |
| 46 | BIND_GSS_FN(release_buffer); |
| 47 | BIND_GSS_FN(release_cred); |
| 48 | BIND_GSS_FN(release_name); |
| 49 | |
| 50 | #undef BIND_GSS_FN |
| 51 | |
| 52 | ssh_gssapi_bind_fns(lib); |
| 53 | } |
| 54 | |
| 55 | /* Dynamically load gssapi libs. */ |
| 56 | struct ssh_gss_liblist *ssh_gss_setup(Conf *conf) |
| 57 | { |
| 58 | void *gsslib; |
| 59 | char *gsspath; |
| 60 | struct ssh_gss_liblist *list = snew(struct ssh_gss_liblist); |
| 61 | |
| 62 | list->libraries = snewn(4, struct ssh_gss_library); |
| 63 | list->nlibraries = 0; |
| 64 | |
| 65 | /* Heimdal's GSSAPI Library */ |
| 66 | if ((gsslib = dlopen("libgssapi.so.2", RTLD_LAZY)) != NULL) |
| 67 | gss_init(&list->libraries[list->nlibraries++], gsslib, |
| 68 | 0, "Using GSSAPI from libgssapi.so.2"); |
| 69 | |
| 70 | /* MIT Kerberos's GSSAPI Library */ |
| 71 | if ((gsslib = dlopen("libgssapi_krb5.so.2", RTLD_LAZY)) != NULL) |
| 72 | gss_init(&list->libraries[list->nlibraries++], gsslib, |
| 73 | 1, "Using GSSAPI from libgssapi_krb5.so.2"); |
| 74 | |
| 75 | /* Sun's GSSAPI Library */ |
| 76 | if ((gsslib = dlopen("libgss.so.1", RTLD_LAZY)) != NULL) |
| 77 | gss_init(&list->libraries[list->nlibraries++], gsslib, |
| 78 | 2, "Using GSSAPI from libgss.so.1"); |
| 79 | |
| 80 | /* User-specified GSSAPI library */ |
| 81 | gsspath = conf_get_filename(conf, CONF_ssh_gss_custom)->path; |
| 82 | if (*gsspath && (gsslib = dlopen(gsspath, RTLD_LAZY)) != NULL) |
| 83 | gss_init(&list->libraries[list->nlibraries++], gsslib, |
| 84 | 3, dupprintf("Using GSSAPI from user-specified" |
| 85 | " library '%s'", gsspath)); |
| 86 | |
| 87 | return list; |
| 88 | } |
| 89 | |
| 90 | void ssh_gss_cleanup(struct ssh_gss_liblist *list) |
| 91 | { |
| 92 | int i; |
| 93 | |
| 94 | /* |
| 95 | * dlopen and dlclose are defined to employ reference counting |
| 96 | * in the case where the same library is repeatedly dlopened, so |
| 97 | * even in a multiple-sessions-per-process context it's safe to |
| 98 | * naively dlclose everything here without worrying about |
| 99 | * destroying it under the feet of another SSH instance still |
| 100 | * using it. |
| 101 | */ |
| 102 | for (i = 0; i < list->nlibraries; i++) { |
| 103 | dlclose(list->libraries[i].handle); |
| 104 | if (list->libraries[i].id == 3) { |
| 105 | /* The 'custom' id involves a dynamically allocated message. |
| 106 | * Note that we must cast away the 'const' to free it. */ |
| 107 | sfree((char *)list->libraries[i].gsslogmsg); |
| 108 | } |
| 109 | } |
| 110 | sfree(list->libraries); |
| 111 | sfree(list); |
| 112 | } |
| 113 | |
| 114 | #elif !defined NO_GSSAPI |
| 115 | |
| 116 | const int ngsslibs = 1; |
| 117 | const char *const gsslibnames[1] = { |
| 118 | "static", |
| 119 | }; |
| 120 | const struct keyvalwhere gsslibkeywords[] = { |
| 121 | { "static", 0, -1, -1 }, |
| 122 | }; |
| 123 | |
| 124 | /* |
| 125 | * Link-time binding against GSSAPI. Here we just construct a single |
| 126 | * library structure containing pointers to the functions we linked |
| 127 | * against. |
| 128 | */ |
| 129 | |
| 130 | #include <gssapi/gssapi.h> |
| 131 | |
| 132 | /* Dynamically load gssapi libs. */ |
| 133 | struct ssh_gss_liblist *ssh_gss_setup(Conf *conf) |
| 134 | { |
| 135 | struct ssh_gss_liblist *list = snew(struct ssh_gss_liblist); |
| 136 | |
| 137 | list->libraries = snew(struct ssh_gss_library); |
| 138 | list->nlibraries = 1; |
| 139 | |
| 140 | list->libraries[0].gsslogmsg = "Using statically linked GSSAPI"; |
| 141 | |
| 142 | #define BIND_GSS_FN(name) \ |
| 143 | list->libraries[0].u.gssapi.name = (t_gss_##name) gss_##name |
| 144 | |
| 145 | BIND_GSS_FN(delete_sec_context); |
| 146 | BIND_GSS_FN(display_status); |
| 147 | BIND_GSS_FN(get_mic); |
| 148 | BIND_GSS_FN(import_name); |
| 149 | BIND_GSS_FN(init_sec_context); |
| 150 | BIND_GSS_FN(release_buffer); |
| 151 | BIND_GSS_FN(release_cred); |
| 152 | BIND_GSS_FN(release_name); |
| 153 | |
| 154 | #undef BIND_GSS_FN |
| 155 | |
| 156 | ssh_gssapi_bind_fns(&list->libraries[0]); |
| 157 | |
| 158 | return list; |
| 159 | } |
| 160 | |
| 161 | void ssh_gss_cleanup(struct ssh_gss_liblist *list) |
| 162 | { |
| 163 | sfree(list->libraries); |
| 164 | sfree(list); |
| 165 | } |
| 166 | |
| 167 | #endif /* NO_LIBDL */ |
| 168 | |
| 169 | #endif /* NO_GSSAPI */ |