9 #include <json-c/json.h>
12 #define PAM_SM_ACCOUNT
13 #define PAM_SM_SESSION
14 #define PAM_SM_PASSWORD
15 #include <security/pam_modules.h>
16 #include <security/pam_appl.h>
18 #define DATABASE_FILE "/etc/agl/keys.json"
20 #define BLOCK_SIZE 4096
21 typedef struct header_
27 int is_valid_mn(const char* v)
29 return v && v[0] == 'I' && v[1] == 'D' && v[2] == 'K' && v[3] == 'Y';
32 int read_device(const char* device, char** idkey)
38 printf("[PAM DEBUG] check_device %s...\n", device);
39 fd = open(device, O_RDONLY);
42 printf("[PAM DEBUG] Failed to open the device %s!\n", device);
43 return PAM_SERVICE_ERR;
46 sz = read(fd, &h, sizeof(header));
47 if (sz != sizeof(header) || !is_valid_mn(h.mn) || h.size < 1) { close(fd); printf("[PAM DEBUG]: bad header!\n"); return PAM_SERVICE_ERR; }
48 printf("[PAM DEBUG]: data size=%lu\n", h.size);
50 *idkey = (char*)malloc(h.size + 1);
51 if (!*idkey) { close(fd); printf("[PAM DEBUG] Bad alloc!\n"); return PAM_SERVICE_ERR; }
53 memset(*idkey, 0, h.size + 1);
54 sz = read(fd, *idkey, h.size);
56 if (sz != h.size) { free(idkey); printf("[PAM DEBUG] Bad data read!\n"); return PAM_SERVICE_ERR; }
60 int authenticate(pam_handle_t* pamh, const char* uuid)
62 struct json_object* database;
63 struct json_object* usb;
64 struct json_object* key;
66 database = json_object_from_file(DATABASE_FILE);
69 printf("[PAM DEBUG] Failed to parse the database\n");
70 return PAM_SERVICE_ERR;
73 if (json_object_object_get_ex(database, "usb", &usb))
75 if (json_object_object_get_ex(usb, uuid, &key))
77 printf("[PAM] Key found!\n");
78 printf("[PAM DEBUG] pam_set_item(\"%s\")\n", uuid);
79 pam_set_item(pamh, PAM_USER, uuid);
81 const char* pam_authtok;
82 if (pam_get_item(pamh, PAM_AUTHTOK, (const void**)&pam_authtok) == PAM_SUCCESS && !pam_authtok)
83 pam_set_item(pamh, PAM_AUTHTOK, uuid);
85 json_object_put(database);
90 printf("[PAM] Key not found!\n");
91 if (database) json_object_put(database);
95 int check_device(pam_handle_t* pamh, const char* device)
100 ret = read_device(device, &idkey);
101 if (ret != PAM_SUCCESS) return ret;
103 printf("[PAM DEBUG] Data read:\n%s\n", idkey);
105 json_object* idkey_json = json_tokener_parse(idkey);
109 printf("[PAM DEBUG] Failed to parse json data!\n");
110 return PAM_SERVICE_ERR;
113 json_object* uuid_json;
114 if(!json_object_object_get_ex(idkey_json, "uuid", &uuid_json))
117 printf("[PAM DEBUG] The json does not contains a valid uuid\n");
118 return PAM_SERVICE_ERR;
121 const char* uuid = json_object_get_string(uuid_json);
122 printf("[PAM DEBUG] uuid: %s\n", uuid);
124 ret = authenticate(pamh, uuid);
126 json_object_put(idkey_json);
130 void log_pam(const char* fname, int flags, int argc, const char** argv, const char* device)
132 printf("[PAM DEBUG] ---------- %s ----------\n", fname);
133 printf("[PAM DEBUG] flags: %d\n", flags);
134 for(int i = 0; i < argc; ++i)
136 printf("[PAM DEBUG] argv[%d]: %s\n", i, argv[i]);
138 printf("[PAM DEBUG] device: %s\n", device);
139 printf("[PAM DEBUG] ----------------------------------------\n");
143 @brief The pam_sm_authenticate function is the service module's implementation
144 of the pam_authenticate(3) interface.
145 This function performs the task of authenticating the user.
147 @param[in] pamh Unknown.
148 @param[in] flags PAM_SILENT and/or PAM_DISALLOW_NULL_AUTHTOK.
149 @return PAM_SUCCESS if ok.
151 PAM_EXTERN int pam_sm_authenticate(pam_handle_t* pamh, int flags, int argc, const char** argv)
153 const char* device = pam_getenv(pamh, "DEVICE");
154 log_pam("pam_sm_authenticate", flags, argc, argv, device);
155 return check_device(pamh, device);
158 PAM_EXTERN int pam_sm_setcred(pam_handle_t* pamh, int flags, int argc, const char** argv)
160 log_pam("pam_sm_setcred", flags, argc, argv, pam_getenv(pamh, "DEVICE"));
164 PAM_EXTERN int pam_sm_acct_mgmt(pam_handle_t* pamh, int flags, int argc, const char** argv)
166 log_pam("pam_sm_acct_mgmt", flags, argc, argv, pam_getenv(pamh, "DEVICE"));
170 PAM_EXTERN int pam_sm_open_session(pam_handle_t* pamh, int flags, int argc, const char** argv)
172 log_pam("pam_sm_open_session", flags, argc, argv, pam_getenv(pamh, "DEVICE"));
176 PAM_EXTERN int pam_sm_close_session(pam_handle_t* pamh, int flags, int argc, const char** argv)
178 log_pam("pam_sm_close_session", flags, argc, argv, pam_getenv(pamh, "DEVICE"));
182 PAM_EXTERN int pam_sm_chauthtok(pam_handle_t* pamh, int flags, int argc, const char** argv)
184 log_pam("pam_sm_chauthtok", flags, argc, argv, pam_getenv(pamh, "DEVICE"));