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1 | #include "putty.h" |
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2 | #ifndef NO_GSSAPI |
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3 | #include "pgssapi.h" |
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4 | #include "sshgss.h" |
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5 | #include "sshgssc.h" |
6 | |
7 | /* Unix code to set up the GSSAPI library list. */ |
8 | |
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9 | #if !defined NO_LIBDL && !defined NO_GSSAPI |
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10 | |
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11 | const int ngsslibs = 4; |
12 | const char *const gsslibnames[4] = { |
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13 | "libgssapi (Heimdal)", |
14 | "libgssapi_krb5 (MIT Kerberos)", |
15 | "libgss (Sun)", |
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16 | "User-specified GSSAPI library", |
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17 | }; |
18 | const struct keyval gsslibkeywords[] = { |
19 | { "libgssapi", 0 }, |
20 | { "libgssapi_krb5", 1 }, |
21 | { "libgss", 2 }, |
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22 | { "custom", 3 }, |
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23 | }; |
24 | |
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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) |
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33 | { |
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34 | lib->id = id; |
35 | lib->gsslogmsg = msg; |
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36 | lib->handle = dlhandle; |
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37 | |
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38 | #define BIND_GSS_FN(name) \ |
39 | lib->u.gssapi.name = (t_gss_##name) dlsym(dlhandle, "gss_" #name) |
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40 | |
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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); |
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49 | |
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50 | #undef BIND_GSS_FN |
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51 | |
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52 | ssh_gssapi_bind_fns(lib); |
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53 | } |
54 | |
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55 | /* Dynamically load gssapi libs. */ |
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56 | struct ssh_gss_liblist *ssh_gss_setup(const Config *cfg) |
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57 | { |
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58 | void *gsslib; |
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59 | struct ssh_gss_liblist *list = snew(struct ssh_gss_liblist); |
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60 | |
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61 | list->libraries = snewn(4, struct ssh_gss_library); |
62 | list->nlibraries = 0; |
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63 | |
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64 | /* Heimdal's GSSAPI Library */ |
65 | if ((gsslib = dlopen("libgssapi.so.2", RTLD_LAZY)) != NULL) |
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66 | gss_init(&list->libraries[list->nlibraries++], gsslib, |
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67 | 0, "Using GSSAPI from libgssapi.so.2"); |
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68 | |
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69 | /* MIT Kerberos's GSSAPI Library */ |
70 | if ((gsslib = dlopen("libgssapi_krb5.so.2", RTLD_LAZY)) != NULL) |
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71 | gss_init(&list->libraries[list->nlibraries++], gsslib, |
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72 | 1, "Using GSSAPI from libgssapi_krb5.so.2"); |
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73 | |
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74 | /* Sun's GSSAPI Library */ |
75 | if ((gsslib = dlopen("libgss.so.1", RTLD_LAZY)) != NULL) |
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76 | gss_init(&list->libraries[list->nlibraries++], gsslib, |
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77 | 2, "Using GSSAPI from libgss.so.1"); |
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78 | |
79 | /* User-specified GSSAPI library */ |
80 | if (cfg->ssh_gss_custom.path[0] && |
81 | (gsslib = dlopen(cfg->ssh_gss_custom.path, RTLD_LAZY)) != NULL) |
82 | gss_init(&list->libraries[list->nlibraries++], gsslib, |
83 | 3, dupprintf("Using GSSAPI from user-specified" |
84 | " library '%s'", cfg->ssh_gss_custom.path)); |
85 | |
86 | return list; |
87 | } |
88 | |
89 | void ssh_gss_cleanup(struct ssh_gss_liblist *list) |
90 | { |
91 | int i; |
92 | |
93 | /* |
94 | * dlopen and dlclose are defined to employ reference counting |
95 | * in the case where the same library is repeatedly dlopened, so |
96 | * even in a multiple-sessions-per-process context it's safe to |
97 | * naively dlclose everything here without worrying about |
98 | * destroying it under the feet of another SSH instance still |
99 | * using it. |
100 | */ |
101 | for (i = 0; i < list->nlibraries; i++) { |
102 | dlclose(list->libraries[i].handle); |
103 | if (list->libraries[i].id == 3) { |
104 | /* The 'custom' id involves a dynamically allocated message. |
105 | * Note that we must cast away the 'const' to free it. */ |
106 | sfree((char *)list->libraries[i].gsslogmsg); |
107 | } |
108 | } |
109 | sfree(list->libraries); |
110 | sfree(list); |
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111 | } |
112 | |
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113 | #elif !defined NO_GSSAPI |
114 | |
115 | const int ngsslibs = 1; |
116 | const char *const gsslibnames[1] = { |
117 | "static", |
118 | }; |
119 | const struct keyval gsslibkeywords[] = { |
120 | { "static", 0 }, |
121 | }; |
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122 | |
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123 | /* |
124 | * Link-time binding against GSSAPI. Here we just construct a single |
125 | * library structure containing pointers to the functions we linked |
126 | * against. |
127 | */ |
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128 | |
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129 | #include <gssapi/gssapi.h> |
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130 | |
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131 | /* Dynamically load gssapi libs. */ |
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132 | struct ssh_gss_liblist *ssh_gss_setup(const Config *cfg) |
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133 | { |
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134 | struct ssh_gss_liblist *list = snew(struct ssh_gss_liblist); |
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135 | |
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136 | list->libraries = snew(struct ssh_gss_library); |
137 | list->nlibraries = 1; |
138 | |
139 | list->libraries[0].gsslogmsg = "Using statically linked GSSAPI"; |
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140 | |
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141 | #define BIND_GSS_FN(name) \ |
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142 | list->libraries[0].u.gssapi.name = (t_gss_##name) gss_##name |
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143 | |
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144 | BIND_GSS_FN(delete_sec_context); |
145 | BIND_GSS_FN(display_status); |
146 | BIND_GSS_FN(get_mic); |
147 | BIND_GSS_FN(import_name); |
148 | BIND_GSS_FN(init_sec_context); |
149 | BIND_GSS_FN(release_buffer); |
150 | BIND_GSS_FN(release_cred); |
151 | BIND_GSS_FN(release_name); |
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152 | |
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153 | #undef BIND_GSS_FN |
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154 | |
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155 | ssh_gssapi_bind_fns(&list->libraries[0]); |
156 | |
157 | return list; |
158 | } |
159 | |
160 | void ssh_gss_cleanup(struct ssh_gss_liblist *list) |
161 | { |
162 | sfree(list->libraries); |
163 | sfree(list); |
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164 | } |
165 | |
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166 | #endif /* NO_LIBDL */ |
167 | |
168 | #endif /* NO_GSSAPI */ |