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-rw-r--r--udev/ykfde.c107
1 files changed, 55 insertions, 52 deletions
diff --git a/udev/ykfde.c b/udev/ykfde.c
index 0f5bd17..2adedbb 100644
--- a/udev/ykfde.c
+++ b/udev/ykfde.c
@@ -13,6 +13,7 @@
#include <dirent.h>
#include <errno.h>
+#include <fcntl.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
@@ -36,12 +37,18 @@
#define EVENT_SIZE (sizeof (struct inotify_event))
#define EVENT_BUF_LEN (1024 * (EVENT_SIZE + 16))
+#define CHALLENGELEN 64
+#define RESPONSELEN SHA1_MAX_BLOCK_SIZE
+#define PASSPHRASELEN SHA1_DIGEST_SIZE * 2
+
#define ASK_PATH "/run/systemd/ask-password/"
#define ASK_MESSAGE "Please enter passphrase for disk"
#define CONFIGFILE "/etc/ykfde.conf"
#define CHALLENGEDIR "/etc/ykfde.d/"
+#define CONFYKSLOT "yk slot"
+
static int send_on_socket(int fd, const char *socket_name, const void *packet, size_t size) {
union {
struct sockaddr sa;
@@ -61,7 +68,7 @@ static int send_on_socket(int fd, const char *socket_name, const void *packet, s
}
static int try_answer(char * ask_file, char * response) {
- int8_t ret = EXIT_FAILURE;
+ int8_t rc = EXIT_FAILURE;
dictionary * ini;
char * ask_message, * ask_socket;
int fd_askpass;
@@ -81,12 +88,12 @@ static int try_answer(char * ask_file, char * response) {
goto out1;
}
- if (send_on_socket(fd_askpass, ask_socket, response, strlen(response)) < 0) {
+ if (send_on_socket(fd_askpass, ask_socket, response, PASSPHRASELEN + 1) < 0) {
perror("send_on_socket() failed");
goto out2;
}
- ret = EXIT_SUCCESS;
+ rc = EXIT_SUCCESS;
out2:
close(fd_askpass);
@@ -94,26 +101,23 @@ out2:
out1:
iniparser_freedict(ini);
- return ret;
+ return rc;
}
int main(int argc, char **argv) {
- int8_t ret = EXIT_FAILURE;
+ int8_t rc = EXIT_FAILURE;
/* Yubikey */
YK_KEY * yk;
uint8_t slot = SLOT_CHAL_HMAC2;
unsigned int serial = 0;
- unsigned char response[SHA1_MAX_BLOCK_SIZE];
- unsigned char response_hex[(SHA1_MAX_BLOCK_SIZE * 2) + 1];
- char response_askpass[(SHA1_MAX_BLOCK_SIZE * 2) + 2];
+ char response[RESPONSELEN], passphrase[PASSPHRASELEN + 1], passphrase_askpass[PASSPHRASELEN + 2];
/* iniparser */
dictionary * ini;
- char section_serial[10 /* unsigned int in char */ + 5 /* ":slot" */ + 1];
+ char section_ykslot[10 /* unsigned int in char */ + 1 + sizeof(CONFYKSLOT) + 1];
/* read challenge */
- size_t fsize;
- char * challenge;
+ char challenge[CHALLENGELEN + 1];
char challengefilename[sizeof(CHALLENGEDIR) + 11 /* "/challenge-" */ + 10 /* unsigned int in char */ + 1];
- FILE * challengefile;
+ int challengefile;
/* read dir */
DIR * dir;
struct dirent * ent;
@@ -127,19 +131,22 @@ int main(int argc, char **argv) {
freopen("/dev/console", "w", stderr);
#endif
+ memset(challenge, 0, CHALLENGELEN);
+
/* init and open first Yubikey */
- if (!yk_init()) {
+ if ((rc = yk_init()) < 0) {
perror("yk_init() failed");
goto out10;
}
if ((yk = yk_open_first_key()) == NULL) {
+ rc = EXIT_FAILURE;
perror("yk_open_first_key() failed");
goto out20;
}
/* read the serial number from key */
- if(!yk_get_serial(yk, 0, 0, &serial)) {
+ if((rc = !yk_get_serial(yk, 0, 0, &serial)) < 0) {
perror("yk_get_serial() failed");
goto out30;
}
@@ -151,42 +158,37 @@ int main(int argc, char **argv) {
goto out30;
/* read challenge from file */
- if ((challengefile = fopen(challengefilename, "r")) == NULL) {
+ if ((rc = challengefile = open(challengefilename, O_RDONLY)) < 0) {
perror("Failed opening challenge file for reading");
goto out30;
}
- fseek(challengefile, 0, SEEK_END);
- fsize = ftell(challengefile);
- fseek(challengefile, 0, SEEK_SET);
- if ((challenge = malloc(fsize + 1)) == NULL) {
- perror("malloc() failed");
- goto out40;
- }
-
- if ((fread(challenge, fsize, 1, challengefile)) != 1) {
+ if ((rc = read(challengefile, challenge, CHALLENGELEN)) < 0) {
perror("Failed reading challenge from file");
goto out50;
}
- challenge[fsize] = 0;
+ challengefile = close(challengefile);
/* finished reading challenge */
/* try to read config file
* if anything here fails we do not care... slot 2 is the default */
if ((ini = iniparser_load(CONFIGFILE)) != NULL) {
/* first try the general setting */
- slot = iniparser_getint(ini, "general:slot", slot);
+ slot = iniparser_getint(ini, "general:" CONFYKSLOT, slot);
- sprintf(section_serial, "%d:slot", serial);
+ sprintf(section_ykslot, "%d:" CONFYKSLOT, serial);
/* then probe for setting with serial number */
- slot = iniparser_getint(ini, section_serial, slot);
+ slot = iniparser_getint(ini, section_ykslot, slot);
switch (slot) {
- case '1':
+ case 1:
+ case SLOT_CHAL_HMAC1:
slot = SLOT_CHAL_HMAC1;
break;
- default: /* slot 2 is default */
+ case 2:
+ case SLOT_CHAL_HMAC2:
+ default:
slot = SLOT_CHAL_HMAC2;
break;
}
@@ -194,26 +196,28 @@ int main(int argc, char **argv) {
iniparser_freedict(ini);
}
- memset(response, 0, sizeof(response));
- memset(response_hex, 0, sizeof(response_hex));
+ memset(response, 0, RESPONSELEN);
+ memset(passphrase, 0, PASSPHRASELEN + 1);
/* do challenge/response and encode to hex */
- if (!yk_challenge_response(yk, slot, true, strlen(challenge), (unsigned char *)challenge, sizeof(response), response)) {
+ if ((rc = yk_challenge_response(yk, slot, true,
+ CHALLENGELEN, (unsigned char *)challenge,
+ RESPONSELEN, (unsigned char *)response)) < 0) {
perror("yk_challenge_response() failed");
goto out50;
}
- yubikey_hex_encode((char *)response_hex, (char *)response, 20);
+ yubikey_hex_encode((char *)passphrase, (char *)response, 20);
- sprintf(response_askpass, "+%s", response_hex);
+ sprintf(passphrase_askpass, "+%s", passphrase);
/* change to directory so we do not have to assemble complete/absolute path */
- if (chdir(ASK_PATH) != 0) {
+ if ((rc = chdir(ASK_PATH)) != 0) {
perror("chdir() failed");
goto out50;
}
/* creating the INOTIFY instance and add ASK_PATH directory into watch list */
- if ((fd_inotify = inotify_init()) < 0) {
+ if ((rc = fd_inotify = inotify_init()) < 0) {
perror("inotify_init() failed");
goto out50;
}
@@ -225,17 +229,18 @@ int main(int argc, char **argv) {
if ((dir = opendir(ASK_PATH)) != NULL) {
while ((ent = readdir(dir)) != NULL) {
if (strncmp(ent->d_name, "ask.", 4) == 0) {
- if ((ret = try_answer(ent->d_name, response_askpass)) == EXIT_SUCCESS)
+ if ((rc = try_answer(ent->d_name, passphrase_askpass)) == EXIT_SUCCESS)
goto out70;
}
}
} else {
+ rc = EXIT_FAILURE;
perror ("opendir() failed");
goto out60;
}
/* read to determine the event change happens. Actually this read blocks until the change event occurs */
- if ((length = read(fd_inotify, buffer, EVENT_BUF_LEN)) < 0) {
+ if ((rc = length = read(fd_inotify, buffer, EVENT_BUF_LEN)) < 0) {
perror("read() failed");
goto out70;
}
@@ -245,7 +250,7 @@ int main(int argc, char **argv) {
while (i < length) {
event = (struct inotify_event *)&buffer[i];
if (event->len > 0)
- if ((ret = try_answer(event->name, response_askpass)) == EXIT_SUCCESS)
+ if ((rc = try_answer(event->name, passphrase_askpass)) == EXIT_SUCCESS)
goto out70;
i += EVENT_SIZE + event->len;
}
@@ -260,33 +265,31 @@ out60:
close(fd_inotify);
out50:
- /* free challenge */
- free(challenge);
-
-out40:
/* close the challenge file */
- fclose(challengefile);
+ if (challengefile)
+ close(challengefile);
/* Unlink it if we were successful, we can not try again later! */
- if (ret == EXIT_SUCCESS)
+ if (rc == EXIT_SUCCESS)
unlink(challengefilename);
out30:
/* wipe response (cleartext password!) from memory */
- memset(response, 0, sizeof(response));
- memset(response_hex, 0, sizeof(response_hex));
- memset(response_askpass, 0, sizeof(response_askpass));
+ memset(challenge, 0, CHALLENGELEN);
+ memset(response, 0, RESPONSELEN);
+ memset(passphrase, 0, PASSPHRASELEN + 1);
+ memset(passphrase_askpass, 0, PASSPHRASELEN + 2);
/* close Yubikey */
- if (!yk_close_key(yk))
+ if (yk_close_key(yk) < 0)
perror("yk_close_key() failed");
out20:
/* release Yubikey */
- if (!yk_release())
+ if (yk_release() < 0)
perror("yk_release() failed");
out10:
- return ret;
+ return rc;
}
// vim: set syntax=c:
generated by cgit v1.2.3-70-g09d2 (git 2.47.0) at 2024-11-01 11:55:10 +0000